JP4409263B2 - Endoscopic needle - Google Patents

Description

  The present invention relates to an endoscope injection needle.

One technique using an endoscope is to introduce an injection needle into a body cavity through a channel of the endoscope and inject a medical solution or the like into an affected area in the body cavity. As the injection needle used at this time, a double tube structure including an inner tube to which a hollow needle is connected and an outer tube that allows the inner tube to move forward and backward is proposed ( For example, see Patent Document 1.)
This endoscope injection needle is inserted into the channel and introduced into the body cavity, and then the inner tube is pushed in to protrude the needle from the distal end of the outer tube and puncture the tissue site in the body cavity, and then inserted through the inner tube. Injecting medicinal solution.
In addition, although it is a field different from injection, an aspiration biopsy needle has been proposed in which a needle is inserted into a body cavity and a hollow needle is punctured and aspirated for biopsy (see, for example, Patent Document 2). .)
Japanese Patent Laid-Open No. 2001-58006 (FIG. 2) US Pat. No. 4,791,937 (FIGS. 1a and 2a)

  However, the conventional endoscope injection needle has a double tube structure, and there is a restriction on the outer diameter to pass through the thin channel of the endoscope, so that the inner diameter of the inner tube is further reduced. As a result, the pipe resistance increases, and there is a problem that the liquid feeding becomes heavy particularly in the case of a high-viscosity chemical solution. In addition, in order to secure the inner diameter of the inner tube, the outer diameter of the outer tube must be increased, but the sliding resistance with the channel increases, and the insertion into the channel deteriorates and puncture occurs. There was a problem that it was difficult. Furthermore, if the inner diameter is increased and the outer diameter is decreased, the tube thickness must be reduced. In this case, the tube may buckle and break when the channel is inserted or the affected part is punctured. It was. In addition, since the tube material is usually resin, the hollow needle is made of metal, and therefore, the bonding between them must be bonded and expensive.

  The present invention has been made in view of the above circumstances, and the tube thickness and tube outer diameter can be set to an optimum shape, ensuring a sufficient amount of liquid feeding and reducing sliding resistance in the channel and in the tube. It is another object of the present invention to provide an endoscope injection needle that can improve the buckling resistance of a tube at a low price.

The present invention employs the following means in order to solve the above problems.
The endoscope injection needle according to the present invention can be inserted into a channel of an endoscope and has a tube portion provided with a locking portion protruding radially inward at a distal end, and can advance and retreat in the tube portion. A hollow needle portion having a distal end portion and a proximal end portion in the axial direction of the tube portion; and an outer diameter smaller than an inner diameter of the tube portion provided integrally or separately on an outer peripheral surface of the hollow needle portion. A large-diameter portion having an outer diameter larger than the outer diameter of the distal end portion or the proximal end portion, and a sealing member that is provided on the distal end side of the large-diameter portion and can be in close contact with the locking portion. , the tip and a said hollow needle portion being connected to the proximal end side can be wire portion forward and backward said tube portion, said large diameter portion and the locking portion is capable adhesion abuts against each other It is characterized by.

  The endoscope injection needle is inserted into the endoscope channel with the hollow needle portion housed in the tube portion, and the wire portion is advanced to the distal end side with the tube portion protruding from the channel tip. By doing so, the hollow needle part can be projected outward from the tube part tip. At this time, since the large-diameter portion protrudes until it comes into contact with the locking portion, the two come into close contact with each other. It can be in a state where it can be distributed.

  In addition, since it is not a double structure with inner and outer tubes as in the past, it is possible to secure a large pipe diameter without the inner tube even if the tube outer diameter is the same, and easy injection or the same pipe diameter as before. As a result, the outer diameter of the tube can be reduced, and the insertion resistance to the channel can be reduced. Furthermore, the pipe diameter of the pipe part can be made the same size, and the thickness of the pipe part can be increased, so that the puncture force can be improved. Moreover, when connecting a hollow needle part to a wire part, it can join by welding etc. which are the connection methods of metals, and can reduce manufacturing cost. Also, since the tube portion and the hollow needle portion do not contact until the large diameter portion is pressed against the locking portion, the sliding resistance when the hollow needle portion is inserted into the tube portion can be reduced to improve operability. it can.

Furthermore, this endoscope injection needle can enhance the adhesion between the large-diameter portion and the locking portion by the sealing member, and the outer periphery of the hollow needle portion when the hollow needle portion is inserted into a living body and fed. Liquid leakage from the surface can be suppressed.
Further, the endoscope injection needle according to the present invention is preferably the endoscope injection needle, and can be brought into close contact with the locking portion by deforming the sealing member.
In addition, the endoscope injection needle according to the present invention is the endoscope injection needle, and it is preferable that the sealing member is deformed by pressing the hollow needle portion into the tube portion. .

The endoscope injection needle according to the present invention includes a tube portion provided with a locking portion projecting radially inward at a distal end thereof, and is capable of moving back and forth in the tube portion, in the axial direction of the tube portion. A hollow needle portion having a distal end portion and a proximal end portion; and an outer peripheral surface of the hollow needle portion which is integrally or separately provided and has an outer diameter smaller than an inner diameter of the tube portion and an outer diameter of the distal end portion or A large-diameter portion having an outer diameter larger than the outer diameter of the proximal end portion, and a wire portion having a distal end connected to the proximal end side of the hollow needle portion and capable of moving back and forth in the tubular portion, A sealing member that is slidably in contact with the peripheral surface is provided at the tip of the large diameter portion.
Since this endoscope injection needle is provided with a sealing member in contact with the inner peripheral surface of the tube portion at the distal end of the large diameter portion, the hollow needle is inserted even while the hollow needle portion is inserted into the tube portion. Liquid leakage from the outer peripheral surface side of the part can be reliably suppressed.
The endoscope injection needle according to the present invention is preferably the endoscope injection needle, wherein the large-diameter portion and the locking portion are in contact with each other so as to be in close contact with each other. .
Further, the endoscope injection needle according to the present invention is preferably the endoscope injection needle, and can be brought into close contact with the locking portion by deforming the sealing member.
In addition, the endoscope injection needle according to the present invention is the endoscope injection needle, and it is preferable that the sealing member is deformed by pressing the hollow needle portion into the tube portion. .

Further, the endoscope injection needle according to the present invention is the endoscope injection needle, wherein the watertight ability in a state where the sealing member is deformed does not deform the sealing member. It is characterized by higher water-tightness.
Further, the endoscope injection needle according to the present invention is the endoscope injection needle, wherein the first water-tightness ability to withstand the injection pressure of the chemical solution in a state where the sealing member is deformed, A second water-tight ability in a state where the sealing member is not deformed and the injection pressure is not applied, and a sliding resistance between the pipe portion and the sealing member is large enough to maintain the second water-tight ability. It is characterized by being.
Since this endoscope injection needle has the second water-tightness capability, even if the sealing member is moved with respect to the tube portion in a state where no injection pressure is applied, the medical solution is prevented from leaking from the tube portion. be able to. In addition, since the first water-tight ability higher than the second water-tight ability is provided, it is possible to prevent the chemical liquid from leaking from the pipe portion when the chemical liquid is injected.

The endoscope injection needle according to the present invention includes a tube portion provided with a locking portion projecting radially inward at a distal end thereof, and is capable of moving back and forth in the tube portion, in the axial direction of the tube portion. A hollow needle portion having a distal end portion and a proximal end portion; and an outer peripheral surface of the hollow needle portion which is integrally or separately provided and has an outer diameter smaller than an inner diameter of the tube portion and an outer diameter of the distal end portion or A large-diameter portion having an outer diameter larger than the outer diameter of the proximal end portion, and a wire portion having a distal end connected to the proximal end side of the hollow needle portion and capable of moving back and forth in the tubular portion, A sealing member that is slidably in contact with the peripheral surface is provided at a proximal end of the large-diameter portion.

  In this endoscope injection needle, since the sealing member is disposed at the above position, the sealing member can be prevented from falling off from the distal end side of the hollow needle portion. Further, the distance between the sealing member and the proximal end of the hollow needle portion can be shortened, and the turbulent flow region generated by the liquid flowing between the large diameter portion and the tube portion can be suppressed to a small size. Furthermore, the air remaining in the gap between the large diameter portion and the tube portion can be discharged.

The endoscope injection needle according to the present invention includes a tube portion provided with a locking portion projecting radially inward at a distal end thereof, and is capable of moving back and forth in the tube portion, in the axial direction of the tube portion. A hollow needle portion having a distal end portion and a proximal end portion; and an outer peripheral surface of the hollow needle portion which is integrally or separately provided and has an outer diameter smaller than an inner diameter of the tube portion and an outer diameter of the distal end portion or A large-diameter portion having an outer diameter larger than the outer diameter of the proximal end portion, and a wire portion having a distal end connected to the proximal end side of the hollow needle portion and capable of moving back and forth in the tubular portion, A sealing member that is slidably in contact with the peripheral surface is provided on a side surface of the large-diameter portion.

  In this endoscope injection needle, since the sealing member is disposed at the above position, the length of the hollow needle portion can be shortened, and the insertion property in the channel is improved and the endoscope It is possible to improve the projecting property of the hollow needle portion from the tip by reducing the portion of the hollow needle portion that is caught in the channel during the bending operation.

The endoscope injection needle according to the present invention is the endoscope injection needle, wherein the locking portion is made of an elastic member, and the distal end of the hollow needle portion is axially moved in the tube portion. It is characterized by being formed longer on the base end side in the axial direction than the moving distance.
In this endoscope injection needle, the tip of the hollow needle portion can always be arranged in the locking portion, and the state where the tip of the hollow needle portion sticks into the locking portion and cannot be protruded from the inside of the tube portion can be avoided. it can.

In addition, an endoscope injection needle according to the present invention includes a tube portion, a hollow needle portion capable of moving forward and backward in the tube portion, and having a distal end portion and a proximal end portion in the axial direction of the tube portion, and the hollow Large diameter having an outer diameter smaller than the inner diameter of the tube portion and larger than the outer diameter of the distal end portion or the outer diameter of the base end portion, provided integrally or separately on the outer peripheral surface of the needle portion And a sealing member provided at a proximal end of the large-diameter portion and slidably in contact with an inner peripheral surface of the tube portion, and can be advanced and retreated in the tube portion, and a distal end is a base of the hollow needle portion A wire portion connected to the end side and formed to a length that allows the sealing member to stop at the distal end of the tube portion; and the wire portion can be advanced and retracted; and the sealing member is disposed at the distal end of the tube portion. And an operation portion capable of stopping the movement of the wire portion when moved.
This endoscope injection needle can regulate the amount of insertion of the hollow needle portion into the living tissue by the large diameter portion, and since there is a sealing member at the proximal end of the large diameter portion, the hollow needle portion Even if the amount of protrusion changes, liquid leakage can be prevented.

The endoscope injection needle according to the present invention is the endoscope injection needle, wherein a center axis of the hollow needle portion and a center axis of the tube portion are provided so as to intersect, and the hollow needle The wire portion is bent so that the tip of the portion can advance and retreat along the central axis of the tube portion.
The endoscope injection needle can easily move the distal end of the hollow needle portion along the central axis of the tube portion when the hollow needle portion protrudes from the distal end of the tube portion. Can be suppressed. At this time, unlike the conventional case, the wire is bent, unlike the case where the tube is bent by thermoforming or the like, so that it is possible to perform inexpensive processing and stably maintain the bent state.

The endoscope injection needle according to the present invention is the endoscope injection needle provided with a hole portion penetrating the side surface of the body of the hollow needle portion, and a wire portion is connected to the hollow needle portion. It is characterized by being.
This endoscope injection needle can make the diameter of the hollow needle portion smaller than when the wire portion is connected to the outer peripheral surface of the hollow needle portion. Therefore, the pipe part diameter can be further reduced.

  According to the present invention, according to the endoscope injection needle, it is possible to inject a liquid having a high viscosity by reducing the pipe resistance. Further, the frictional resistance with the channel of the endoscope can be reduced and the channel insertion property can be improved. Furthermore, it is possible to increase the resistance against buckling and to reduce the folding that occurs during insertion into the channel and handling. Moreover, both can be joined at a lower cost than the conventional bonding between the hollow needle and the tube.

A first embodiment of an endoscope injection needle according to the present invention will be described with reference to FIGS. 1 to 4.
As shown in FIGS. 1 and 2, the endoscope injection needle 1 according to the present embodiment is provided with a locking portion 2 that can be inserted into the channel of the endoscope and protrudes radially inward at the tip. The pipe portion 3 and the large diameter portion 5A having an outer diameter larger than the outer diameter of the distal end or the base end and smaller than the inner diameter of the tube portion 3 are integrated with or separated from the outer peripheral surface. A hollow needle portion 5 provided at the front end, a wire portion 6 having a distal end connected to the proximal end side of the hollow needle portion 5 and capable of moving back and forth in the tube portion 3, and an operation capable of moving the wire portion 6 back and forth within the tube portion 3. Part 7.

The tube portion 3 is made of a resin such as fluorine, polyamide, or polyethylene, and has a shape that allows the main body of the hollow needle portion 5 to pass through the locking portion 2 but not the large diameter portion 5A. Yes.
An O-ring (sealing member) 8 made of a resin having an outer diameter smaller than the inner diameter of the pipe portion 3 is provided on the distal end side of the large diameter portion 5A. When 5A is pressed against the locking portion 2, it is watertight.
The O-ring 8 is preferably press-fitted into the outer peripheral surface of the hollow needle portion 5 in order to prevent the hollow needle portion 5 from falling off, or the inner peripheral surface is formed flat. It is good also as what roughens the outer peripheral surface of the part 5, and improves mutual frictional resistance.
The O-ring 8 may have an oval shape other than a circular shape, an oval shape, a rectangular shape, or the like.

The wire portion 6 is, for example, a single wire made of stainless steel having an outer diameter of 0.3 to 0.5 mm, and is brazed to the outer peripheral surface of the proximal end side of the hollow needle portion 5 and joined by a metal connection method such as welding. Has been.
The operation portion 7 is connected to the base end of the tube portion 3 and has a main body 10 provided with a through hole 10a in the axial direction, and a slide portion formed so as to be slidable in the through hole 10a and connected to the base end of the wire portion 6. 11.
The slide part 11 is also provided with a through-hole 11a in the axial direction, so that a chemical solution can be injected from a base 12 provided at the base end.

Next, a method of using the endoscope injection needle 1 according to the present embodiment, and actions and effects will be described.
First, it inserts in the channel of an endoscope in the state in which the front-end | tip of the hollow needle part 5 was accommodated in the pipe part 3. FIG.
After protruding the distal end of the tube portion 3 from the distal end of the endoscope, the slide portion 11 is pushed into the main body 10 to advance the wire portion toward the distal end side of the tube portion 3.
At this time, the hollow needle portion 5 connected to the tip of the wire portion 6 advances in the tube portion 3.
Since it has the 2nd watertight capability, even if it moves a sealing member with respect to a pipe part in the state where injection pressure is not applied, it can suppress that a chemical | medical solution leaks from a pipe part.
When the distal end side of the hollow needle portion 5 protrudes from the distal end of the tube portion 3, the O-ring 8 comes into contact with the locking portion 2 and the hollow needle portion 5 temporarily stops. When the slide part 11 is pushed in from this state, the O-ring 8 is pressed against the locking part 2 and elastically deformed as shown in FIG. Thus, the hollow needle portion 5 and the tube portion 3 are brought into a watertight state. At this time, the A portion of the slide portion 11 is press-fitted into the main body 10 and is fixed in a state where the slide portion 11 is pushed into the main body 10.

Thereafter, the hollow needle portion 5 is punctured into the body tissue by further protruding the tube portion 3 from the distal end of the endoscope.
And by attaching a syringe etc. to the nozzle | cap | die 12 in which the chemical | medical solution was inserted and operating, a chemical | medical solution is inject | poured in the pipe part 3, and inject | pours into a body tissue through the hollow needle part 5. FIG.

According to the endoscope injection needle 1, the hollow needle portion 5 is protruded until the large diameter portion 5 </ b> A comes into contact with the locking portion 2. The chemical solution can obtain a water-tight ability (first water-tight ability) that allows only the inside of the hollow needle portion 5 to flow through the inside of the hollow needle portion 5. Leakage can be suppressed.
Moreover, since it is not the double structure by an inner and outer tube like the past, even if the tube outer diameter is the same, the branch line diameter without an inner tube can be ensured large. For example, in the case of a conventional double tube type injection needle in which the inner diameter and outer diameter of the outer tube are 1.7 mm and 2.4 mm, respectively, and the inner diameter and outer diameter of the inner tube are 0.85 mm and 1.55 mm, respectively, As shown in FIG. 4 (a), the chemical liquid can be circulated only in the cross-sectional area A portion of the pipe line, but when the inner diameter and outer diameter of the pipe portion 3 are the same as those of the outer tube, FIG. ), The cross-sectional area B can be circulated, so that the cross-sectional area can be increased to about 385%. Thereby, the pipe line resistance of the inner surface of the pipe portion 3 which is as long as 1.5 to 2.5 m can be greatly reduced, and even a highly viscous chemical solution can be sent more lightly than before.

  Moreover, the outer diameter of the pipe part 3 can be made small by setting the pipe diameter to the same size as the conventional one. Therefore, the clearance between the endoscope and the channel can be increased, and the insertion property in the channel can be improved. Furthermore, when the tube 3 is pushed into the endoscope and the hollow needle 5 is punctured into the body tissue, the frictional resistance with the channel can be reduced, and the tissue puncture performance is improved (the puncture force is lightened). )can do.

Moreover, the cross-sectional area which can distribute | circulate a chemical | medical solution and the outer diameter of the pipe part 3 can be made into the magnitude | size similar to the past, and the thickness of the pipe part 3 can be made thick. In this case, the strength against buckling of the tube portion 3 can be increased, and bending of the tube portion 3 can be suppressed when inserting an endoscope or puncturing a tissue.
Moreover, when connecting the wire part 6 and the hollow needle part 5, it can join by welding etc. which are the connection methods of metals, and an inexpensive thing can be provided. Further, since the O-ring 8 does not contact the inner peripheral surface of the pipe part 3 until the large-diameter part 5A is pressed against the locking part 2, the O-ring 8 is moved with respect to the pipe part 3 without applying chemical injection pressure. Even when it is made to slide, the sliding when the hollow needle portion 5 is inserted into the tube portion 3 to such an extent that the watertight capability (second watertight capability) that can prevent the chemical solution from leaking from the tube portion 3 can be obtained. The operability can be improved by reducing the resistance.

Moreover, since the wire part 6 is connected to the outer peripheral surface of the hollow needle part 5, the liquid supply conduit can be maintained in a straight line as in the prior art, and even a highly viscous chemical solution can be easily supplied. it can.
Further, since only the hollow needle portion 5 is made of a rigid member on the distal end side of the tube portion 3, by reducing the length of the hollow needle portion, an endoscope, particularly when used for a digestive tract or the like. Even in the case where the distal end of the needle must be bent up to 240 degrees, insertion into the endoscope and protrusion of the needle can be performed lightly.

Next, a second embodiment will be described with reference to FIG.
In addition, the same code | symbol is attached | subjected to the component similar to 1st Embodiment mentioned above, and description is abbreviate | omitted.
The difference between the second embodiment and the first embodiment is that the O-ring 8 of the endoscope injection needle 13 according to this embodiment is arranged on the proximal end side of the large-diameter portion 5A, and the tube portion It is the point which is contacting the inner peripheral surface of 3 so that sliding is possible.

This endoscope injection needle 13 can also have the same usage method, action, and effect as in the first embodiment, but reliably restrains the O-ring 8 from dropping from the tip of the hollow needle portion 5. It is possible to maintain the watertight state of the tube portion 3 and the hollow needle portion 5 more suitably.
Moreover, when a chemical | medical solution flows in into the inside of the hollow needle part 5, the generation | occurrence | production area | region of a turbulent flow can be restrained small on the base end side of the large diameter part 5A.
Furthermore, the inflow of air into the gap between the large diameter portion 5A and the tube portion 3 can be prevented.

Next, a third embodiment will be described with reference to FIG.
In addition, the same code | symbol is attached | subjected to the component similar to other embodiment mentioned above, and description is abbreviate | omitted.
The difference between the third embodiment and the second embodiment is that the O-ring 8 of the endoscope injection needle 15 according to this embodiment is arranged on the side surface of the large-diameter portion 5A. is there.
Further, a groove 16 that can be engaged with the O-ring 8 is provided on the side surface of the large-diameter portion 5A to prevent the O-ring 8 from falling off.

This endoscope injection needle 15 can achieve the same operation and effect by the same method of use as in the second embodiment, but the length of the hollow needle portion 5 can be shortened, and the insertion into the channel is possible. In addition to improving the performance, it is possible to improve the projecting property of the hollow needle portion 5 from the tip by reducing the portion of the hollow needle portion 5 that is caught in the channel during the bending operation of the endoscope.
Further, it is possible to prevent the O-ring 8 from moving in the front-rear direction of the hollow needle portion 5.

Next, a fourth embodiment will be described with reference to FIG.
In addition, the same code | symbol is attached | subjected to the component similar to other embodiment mentioned above, and description is abbreviate | omitted.
The difference between the fourth embodiment and the first embodiment is that the endoscope injection needle 17 according to the present embodiment is configured such that the large-diameter portion 18 is elastically deformed and can be brought into close contact with the locking portion 2. It is a point.

The endoscope injection needle 17 can obtain the same operation and effect by the same usage method as in the first embodiment, but the large diameter portion 18 is elastically deformed and can be brought into close contact with the locking portion 2. Therefore, the adhesion between the large diameter portion 18 and the locking portion 2 can be further improved.
Further, since the large diameter portion 18 also functions as a sealing member, the manufacturing cost can be reduced.

Next, a fifth embodiment will be described with reference to FIG.
In addition, the same code | symbol is attached | subjected to the component similar to other embodiment mentioned above, and description is abbreviate | omitted.
The difference between the fifth embodiment and the first embodiment is that the endoscope injection needle 20 according to this embodiment has a sealing member 21A in the locking portion 21 as shown in FIG. Is arranged so that it can be elastically deformed and can be brought into close contact with the large-diameter portion 5A.
According to the endoscope injection needle 20, when the large diameter portion 5A is brought into contact with the locking portion 21, as shown in FIG. 8B, the locking portion 21 is brought into close contact with the large diameter portion 5A. Therefore, the same operations and effects as in the fourth embodiment can be obtained.
Moreover, since the sealing member 21A does not move with respect to the tube portion 3, it is not necessary to worry about the sealing member falling off from the hollow needle portion as in the first embodiment.

Next, a sixth embodiment will be described with reference to FIG.
In addition, the same code | symbol is attached | subjected to the component similar to other embodiment mentioned above, and description is abbreviate | omitted.
The difference between the sixth embodiment and the other embodiments described above is that the endoscope injection needle 22 according to this embodiment is provided with a lid portion 24 at the distal end of the tube portion 23. .
The lid portion 24 is made of a soft member made of resin or the like that can penetrate the hollow needle portion 5.

The endoscope injection needle 22 is inserted into the endoscope channel and protrudes the distal end of the tube portion 23 from the distal end of the endoscope, and then operates the slide portion 11 as in the other embodiments. The hollow needle portion 5 is advanced into the tube portion 3.
When the distal end of the hollow needle portion 5 reaches the lid portion 24, the slide portion 11 is further pushed in, penetrates the lid portion 24, and protrudes from the distal end of the tube portion 23. At this time, the lid portion 24 and the outer peripheral surface of the hollow needle portion 5 are in close contact with each other, and the watertight state is maintained.

  According to the endoscope injection needle 22, since the lid portion 24 is disposed at the tip of the tube portion 23 instead of the locking portion, it is not necessary to provide a locking portion, and the tube portion 23 is inexpensive. Can be manufactured. Moreover, until the hollow needle part 5 protrudes from the front-end | tip, the inside of the pipe part 23 can be maintained in the sealing state by the cover part 24, and a sterilization state can be maintained.

Next, a seventh embodiment will be described with reference to FIG.
In addition, the same code | symbol is attached | subjected to the component similar to other embodiment mentioned above, and description is abbreviate | omitted.
The difference between the seventh embodiment and the first embodiment is that the endoscope injection needle 25 according to this embodiment has an outer diameter of the large-diameter portion 26 that gradually tapers from the distal end toward the proximal end. The inner diameter of the locking portion 27 is formed so as to be gradually tapered toward the proximal end side in accordance with the outer diameter on the distal end side of the large diameter portion 26.
The endoscope injection needle 25 can obtain the same action and effect by the same method of use as in the first embodiment, but the tapered surface is different from the contact surface between the large-diameter portion 26 and the locking portion 27. And can be brought into close contact with a larger surface area. Further, since the O-ring 8 or the like is unnecessary, it is not necessary to consider the dropping of the O-ring 8 or the like, and the manufacturing cost can be reduced.

Next, an eighth embodiment will be described with reference to FIG.
In addition, the same code | symbol is attached | subjected to the component similar to other embodiment mentioned above, and description is abbreviate | omitted.
The difference between the eighth embodiment and the first embodiment is that the endoscope injection needle 28 according to the present embodiment is configured such that the locking portion 30 is made of an elastic member made of resin or the like, and the hollow needle portion 5 is used. The locking portion 30 is formed longer on the proximal side in the axial direction than the distance that the distal end of the tube moves in the axial direction in the tube portion 31.

  The endoscope injection needle 28 can obtain the same operation and effect by the same method of use as in the first embodiment, but the tip is always locked when the hollow needle portion 5 is in the tube portion 31. Since it will be in the state arrange | positioned in the part 30, the state where the front-end | tip of a needle pierces the latching | locking part 30 and cannot protrude from the inside of the pipe part 31 can be avoided. Therefore, it is possible to prevent the O-ring 8 from dropping from the needle tip. Moreover, since the latching | locking part 30 is comprised with the elastic member, the penetration property in a channel can be made favorable.

Next, a ninth embodiment will be described with reference to FIG.
In addition, the same code | symbol is attached | subjected to the component similar to other embodiment mentioned above, and description is abbreviate | omitted.
The difference between the ninth embodiment and the second embodiment is that the wire portion 33 of the endoscope injection needle 32 according to this embodiment has a length that allows the O-ring 8 to stop at the distal end of the tube portion 35. The operation part 36 is configured such that the movement of the wire part 33 can be stopped at a position where the O-ring 8 can be stopped at the distal end of the pipe part 35.

  In this endoscope injection needle 32, instead of positioning the hollow needle portion 5 by abutting the large diameter portion 5A and the locking portion 2 as in the second embodiment, the length of the wire portion 33 is increased. The hollow needle portion 5 can be positioned by operating the operation portion 36 with a predetermined length in advance. Further, the amount of penetration of the hollow needle portion 5 into the living tissue can be defined by the large diameter portion 5A. Further, since the O-ring 8 is provided at the proximal end of the large diameter portion 5A, the protruding amount of the hollow needle portion 5 Even if changes, liquid leakage from the outer peripheral surface of the hollow needle portion 5 to the outside of the tube portion 35 can be prevented.

Next, a tenth embodiment will be described with reference to FIG.
In addition, the same code | symbol is attached | subjected to the component similar to other embodiment mentioned above, and description is abbreviate | omitted.
The difference between the tenth embodiment and the first embodiment is that the endoscope injection needle 37 according to this embodiment is such that the O-ring 8 is slidably in contact with the inner peripheral surface of the tube portion 3. It is the point that it is arranged.
The endoscope injection needle 37 can obtain the same operation and effect by the same method of use as in the first embodiment. However, even when the hollow needle portion 5 is housed in the tube portion 3, Since the ring 8 is in contact with the inner peripheral surface of the tube portion 3, liquid leakage from the outer peripheral surface of the hollow needle portion 5 to the outside of the tube portion 3 can be prevented.

Next, an eleventh embodiment will be described with reference to FIG.
In addition, the same code | symbol is attached | subjected to the component similar to other embodiment mentioned above, and description is abbreviate | omitted.
The difference between the eleventh embodiment and the other embodiments described above is that, in the endoscope injection needle 38 according to this embodiment, the central axis C1 of the hollow needle portion 5 and the central axis C2 of the tube portion 3 intersect. The wire portion 40 is bent so that the tip of the hollow needle portion 5 is movable along the central axis of the tube portion 3.

  Since the endoscope injection needle 38 has the above-described configuration, when the hollow needle portion 5 is projected from the distal end of the tube portion 3, the central axis C1 of the hollow needle portion 5 and the central axis C2 of the tube portion 3 are used. The tip of the hollow needle portion 5 can be arranged on the central axis C2 of the tube portion 3 more easily than when being assembled so as to be arranged coaxially. Therefore, it is possible to prevent the needle tip from being caught by the locking portion 2 when the hollow needle portion 5 is moved to the tip. At this time, unlike the conventional case, the wire portion 40 is bent unlike the case where the tube is bent by thermoforming or the like, so that inexpensive processing can be performed and the bent state can be stably maintained.

Next, a twelfth embodiment will be described with reference to FIG.
In addition, the same code | symbol is attached | subjected to the component similar to other embodiment mentioned above, and description is abbreviate | omitted.
The difference between the twelfth embodiment and the other embodiments described above is that a hole 43 that penetrates the body side surface of the hollow needle portion 42 of the injection needle 41 for endoscope according to this embodiment is provided. The wire portion 6 is connected to the inside 5.
The opening area of the hole portion 43 is formed to have a cross-sectional area larger than the inner diameter area of the hollow needle portion 5. Therefore, the inner diameter area of the hollow needle portion 5 is set to the smallest area in the chemical liquid feeding conduit.
The wire portion 6 is connected to the hollow needle portion 5 by a method such as caulking.

  The endoscope injection needle 41 can make the diameter of the hollow needle portion smaller than when the wire portion is connected to the outer peripheral surface of the hollow needle portion as in the other embodiments. Therefore, the outer diameter of the tube part 3 can be made smaller, the insertion property into the channel can be improved, and the puncture property of the hollow needle part 5 can be improved. Moreover, the thickness of the pipe part 3 can be further increased, and the buckling resistance can be improved.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the first embodiment, the O-ring 8 is arranged at a position between the large-diameter portion 5A and the locking portion 2. However, as shown in FIG. 5A and the latching | locking part 2 may be sufficient if it can contact | adhere directly.

It is a side view showing an injection needle for endoscopes in a 1st embodiment concerning the present invention. It is sectional drawing along the axial direction which shows the injection needle for endoscopes in 1st Embodiment which concerns on this invention. It is sectional drawing along the axial direction which shows the principal part of the injection needle for endoscopes in 1st Embodiment which concerns on this invention. It is sectional drawing of a perpendicular direction to the axial direction of the injection needle for endoscopes in 1st Embodiment which concerns on this invention. It is sectional drawing along the axial direction which shows the principal part of the injection needle for endoscopes in 2nd Embodiment which concerns on this invention. It is sectional drawing along the axial direction which shows the principal part of the injection needle for endoscopes in 3rd Embodiment which concerns on this invention. It is sectional drawing along the axial direction which shows the principal part of the injection needle for endoscopes in 4th Embodiment which concerns on this invention. It is sectional drawing along the axial direction which shows the principal part of the injection needle for endoscopes in 5th Embodiment which concerns on this invention. It is sectional drawing along the axial direction which shows the principal part of the injection needle for endoscopes in 6th Embodiment which concerns on this invention. It is sectional drawing along the axial direction which shows the principal part of the injection needle for endoscopes in 7th Embodiment which concerns on this invention. It is sectional drawing along the axial direction which shows the principal part of the injection needle for endoscopes in 8th Embodiment which concerns on this invention. It is sectional drawing along the axial direction which shows the injection needle for endoscopes in 9th Embodiment which concerns on this invention. It is sectional drawing along the axial direction which shows the principal part of the injection needle for endoscopes in 10th Embodiment which concerns on this invention. It is sectional drawing along the axial direction which shows the principal part of the injection needle for endoscopes in 11th Embodiment which concerns on this invention. It is sectional drawing along the axial direction which shows the principal part of the injection needle for endoscopes in 12th Embodiment based on this invention. It is sectional drawing along the axial direction which shows the principal part of the injection needle for endoscopes in other embodiment which concerns on this invention.

Explanation of symbols

1, 13, 15, 17, 20, 22, 25, 28, 32, 37, 38, 41 Endoscopic injection needle 2, 27, 30 Locking portion 3, 23, 31, 35 Tube portion 5, 42 Hollow Needle part 5A, 18, 26 Large diameter part 6, 33, 40 Wire part 8 O-ring (sealing member)
43 holes

Claims (15)

A tube portion that can be inserted into the channel of the endoscope and is provided with a locking portion protruding radially inward at the tip;
A hollow needle portion capable of moving forward and backward in the tube portion, and having a distal end portion and a proximal end portion in the axial direction of the tube portion;
Provided integrally or separately on the outer peripheral surface of the hollow needle portion, and has an outer diameter smaller than the inner diameter of the tube portion and an outer diameter larger than the outer diameter of the distal end portion or the outer diameter of the proximal end portion. A large diameter part,
A sealing member that is provided on the distal end side of the large-diameter portion and can be in close contact with the locking portion;
A distal end is connected to the proximal end side of the hollow needle portion and includes a wire portion capable of moving back and forth in the tube portion;
The injection needle for an endoscope, wherein the large-diameter portion and the locking portion are brought into contact with each other and can be brought into close contact with each other. 2. The endoscope injection needle according to claim 1 , wherein the sealing member is deformable so as to be in close contact with the locking portion. 3. The endoscope injection needle according to claim 2 , wherein the sealing member is deformed by pressing the hollow needle portion against the tube portion. A tube portion provided with a locking portion protruding radially inward at the tip;
A hollow needle portion capable of moving forward and backward in the tube portion, and having a distal end portion and a proximal end portion in the axial direction of the tube portion;
Provided integrally or separately on the outer peripheral surface of the hollow needle portion, and has an outer diameter smaller than the inner diameter of the tube portion and an outer diameter larger than the outer diameter of the distal end portion or the outer diameter of the proximal end portion. A large diameter part,
A distal end is connected to the proximal end side of the hollow needle portion and includes a wire portion capable of moving back and forth in the tube portion;
An injection needle for an endoscope, wherein a sealing member that is slidably in contact with an inner peripheral surface of the tube portion is provided at a distal end of the large-diameter portion. The endoscope needle according to claim 4 , wherein the large-diameter portion and the locking portion are brought into contact with each other and can be brought into close contact with each other. The injection needle for an endoscope according to claim 4 , wherein the sealing member can be brought into close contact with the locking portion by deforming the sealing member. The endoscope injection needle according to claim 6 , wherein the sealing member is deformed by pressing the hollow needle portion into the tube portion. The injection needle for an endoscope according to claim 6 or 7 , wherein a watertight ability in a state where the sealing member is deformed is higher than a watertight ability in a state where the sealing member is not deformed. A first watertight capability capable of withstanding the injection pressure of the chemical solution in a state where the sealing member is deformed;
A second watertight capability in a state where the injection pressure is not applied in a state where the sealing member is not deformed,
The endoscope according to any one of claims 6 to 8 , wherein a sliding resistance between the tube portion and the sealing member is set to a size capable of maintaining the second watertight capability. Needle. A tube portion provided with a locking portion protruding radially inward at the tip;
A hollow needle portion capable of moving forward and backward in the tube portion, and having a distal end portion and a proximal end portion in the axial direction of the tube portion;
Provided integrally or separately on the outer peripheral surface of the hollow needle portion, and has an outer diameter smaller than the inner diameter of the tube portion and an outer diameter larger than the outer diameter of the distal end portion or the outer diameter of the proximal end portion. A large diameter part ,
A distal end is connected to the proximal end side of the hollow needle portion and includes a wire portion capable of moving back and forth in the tube portion;
An injection needle for an endoscope, wherein a sealing member that is slidably in contact with an inner peripheral surface of the tube portion is provided at a proximal end of the large-diameter portion. A tube portion provided with a locking portion protruding radially inward at the tip;
A hollow needle portion capable of moving forward and backward in the tube portion, and having a distal end portion and a proximal end portion in the axial direction of the tube portion;
Provided integrally or separately on the outer peripheral surface of the hollow needle portion, and has an outer diameter smaller than the inner diameter of the tube portion and an outer diameter larger than the outer diameter of the distal end portion or the outer diameter of the proximal end portion. A large diameter part,
A distal end is connected to the proximal end side of the hollow needle portion and includes a wire portion capable of moving back and forth in the tube portion;
An injection needle for an endoscope, wherein a sealing member that slidably contacts with an inner peripheral surface of the tube portion is provided on a side surface of the large-diameter portion. The locking portion is made of an elastic member, and the distal end of the hollow needle portion is formed longer on the proximal side in the axial direction than the distance in which the inside of the tube portion moves in the axial direction. 11. The endoscope injection needle according to any one of 11 above. A pipe section;
A hollow needle portion capable of moving forward and backward in the tube portion, and having a distal end portion and a proximal end portion in the axial direction of the tube portion;
Provided integrally or separately on the outer peripheral surface of the hollow needle portion, and has an outer diameter smaller than the inner diameter of the tube portion and an outer diameter larger than the outer diameter of the distal end portion or the outer diameter of the proximal end portion. A large diameter part,
A sealing member that is provided at the base end of the large-diameter portion and that is slidably in contact with the inner peripheral surface of the pipe portion;
A wire portion formed such that the inside of the tube portion can be advanced and retracted, a distal end is connected to a proximal end side of the hollow needle portion, and the sealing member can be stopped at the distal end of the tube portion;
Endoscopic injection, comprising: an operating portion that is capable of advancing and retracting the wire portion and capable of stopping the movement of the wire portion when the sealing member moves to a distal end of the tube portion. needle. The central axis of the hollow needle portion and the central axis of the tube portion are provided so as to intersect, and the wire portion is bent so that the tip of the hollow needle portion can advance and retreat along the central axis of the tube portion. the injection needle for the endoscope according to claim 1, any one of 1 to 3, characterized in. A hole penetrating the side surface of the hollow needle body is provided;
The injection needle for the endoscope according to claim 1, any one of 1 4, characterized in that the wire section in the hollow needle part is connected.

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