JP4723267B2 - Indwelling needle set - Google Patents

Description

  The present invention relates to an indwelling needle set including an indwelling needle that is placed in a blood vessel when performing hemodialysis or the like.

  Conventionally, treatment using a set of indwelling needles such as hemodialysis or supply of a predetermined drug solution or the like is performed on a patient's blood vessel. The indwelling needle set used in such a case includes an outer needle for placement in the patient's blood vessel and an inner needle for smooth insertion of the outer needle into the patient's blood vessel. With a needle. In use, the inner needle is inserted into the outer needle, and the outer needle is punctured into the blood vessel together with the inner needle while the distal end of the inner needle is slightly protruded from the distal end of the outer needle. Next, with the outer needle indwelled in the blood vessel, the inner needle is removed from the outer needle (blood vessel), and blood is obtained by connecting a tube member or the like for supplying predetermined blood or a chemical solution to the rear end of the outer needle. Dialysis and chemicals are supplied.

Further, among the indwelling needles provided in such an indwelling needle set, when extracting the inner needle from the outer needle, a valve body for preventing blood from being discharged from the rear end portion of the outer needle, and the outer needle And a connector for connecting a tube member and the like (for example, see Patent Document 1). In this indwelling needle, a valve body is attached to the rear end portion of the outer needle. The valve body is provided with an opening / closing hole through which the inner needle is inserted in a liquid-tight manner and closed when the inner needle is removed. Yes. The connector is composed of an insertion tube that can be inserted into the opening / closing hole of the valve body and a cylindrical screw adapter having a screw formed on the inner peripheral surface thereof. It is attached in a state in which the position can be changed with respect to the outer needle by screwing into an annular protrusion formed on the portion.
Japanese Patent Laid-Open No. 2001-46507

  However, the conventional indwelling needle set described above has a problem that the operation is troublesome because the connector is attached to the outer needle by screwing the annular protrusion of the outer needle and the screw of the connector. In addition, some conventional indwelling needles simply attach the insertion tube to the rear end of the outer needle and attach the connector to the outer needle, but this will loosen the connector during use. There is a fear.

  The present invention has been made in view of such circumstances, and an object thereof is to provide an indwelling needle set including a connector that can be easily attached to the outer needle and can be prevented from being inadvertently detached from the outer needle. is there.

  In order to achieve the above-described object, the indwelling needle set according to the present invention is characterized in that a cannula having a lumen and a flow path connected to the base of the cannula and communicating with the lumen of the cannula are provided. An outer needle comprising a housing, a metal needle that has a lumen and can be inserted into the outer needle with the tip protruding from the tip opening of the cannula, and a hub connected to the base of the metal needle A valve body having an opening and closing hole for closing the flow path when the metal needle is inserted through the inner needle and the metal needle that is provided in the housing and inserted into the outer needle can be liquid-tightly passed; A connector that can be connected to the housing of the outer needle while the insertion tube is inserted into the opening / closing hole when the inner needle is removed from the outer needle when the inner needle is removed from the outer needle. An indwelling needle set comprising It consists of an engagement protrusion and an engagement recess on the wing and the connector, and by pressing one side of the engagement protrusion and the engagement recess from the outer peripheral surface side of the housing or connector toward the central axis. A plurality of engagement mechanisms that can be released are provided, and an engagement release portion is provided for pressing one side of the engagement protrusion and the engagement recess from the outer peripheral surface side of the housing or the connector toward the central axis. .

  In the indwelling needle set of the present invention configured as described above, the housing and the connector are provided with the engaging mechanism including the engaging protrusion and the engaging recess that engage with each other so that the connector can be connected to the outer needle. I have to. In this case, for example, the connector can be connected to the outer needle by being inserted into the housing. Therefore, it is easy to attach the connector to the outer needle, and it is possible to prevent the connector from being detached from the outer needle.

  Further, when the connector is removed from the outer needle, the engagement between the engagement protrusion and the engagement recess can be released by pressing the engagement release portion, which facilitates the operation. Further, since the engagement mechanism and the disengagement part are configured in plural, the engagement mechanism is not disengaged unless all the disengagement parts are pressed, and the connector is inadvertently disconnected from the outer needle. It will not come off. In this case, the housing may be provided with an engagement recess, and the connector may be provided with an engagement projection, or the housing may be provided with an engagement projection and the connector may be provided with an engagement recess. In the present invention, liquid-tight means that the peripheral surface of the opening / closing hole of the valve body is in close contact with the peripheral surface of the metal needle, and the liquid cannot enter during that time.

Further, another structural feature of the indwelling needle set according to the present invention is that the engagement mechanism includes a guide groove provided from the insertion port side end portion of the connector toward the cannula side in the housing, and a back end of the guide groove. An engagement recess formed by an engagement hole provided in communication with the connector and having a width larger than the width of the back end of the guide groove, and is provided in the connector and can be inserted into the housing and is directed toward the central axis of the connector. And a flexible piece that can be bent by the outer surface of the flexible piece and has a width that is larger than the width of the back end of the guide groove, and enters the engagement hole and engages with the engagement hole. The engagement protrusion is composed of an engagement protrusion that can be engaged, and the engagement release portion is formed of a pressing portion that is provided on the outer end surface of the engagement protrusion and can pass through the guide groove, and the pressing portion can be pressed. by deflecting the FLEXIBLE piece toward the central axis of the connector The engagement concave portion and the engaging projection or engaged, in that to be able to or allowed to release the engagement.

  In the indwelling needle set configured as described above, the engagement protrusion of the engagement mechanism is configured by a flexible piece and an engagement protrusion provided on the outer surface of the flexible piece, and the engagement recess is formed as a guide. It is comprised by the groove | channel and the engagement hole provided in the back end part of the guide groove. The width of the engaging protrusion is larger than the width of the inner end of the guide groove and smaller than the width of the engaging hole. Therefore, the engagement protrusion can enter the engagement hole and engage with the engagement hole to fix the connector to the housing, but cannot pass through the inner end of the guide groove. For this reason, even if it tries to pull out a connector from a housing in the state where an engagement protrusion engaged with an engagement hole, a connector does not remove from a housing.

  Further, the disengagement portion is constituted by a pressing portion provided on the outer end surface of the engaging projection, and this pressing portion can pass through the inner end portion of the guide groove. For this reason, it is possible to release the engagement between the engaging protrusion and the engaging hole by bending the flexible piece by pressing the pressing portion toward the central axis of the connector. In this case, the engaging protrusion is positioned on the inner side of the housing, and the pressing portion is positioned in the engaging hole. Therefore, in this state, by moving the connector so as to be pulled out from the opening of the housing, the pressing portion passes through the guide groove, so that the connector can be removed from the housing.

  Also, when the connector is attached to the housing, the connector can be inserted into the housing by passing through the guide groove while pressing the pressing portion. Then, by releasing the pressing portion when the pressing portion is positioned in the engaging hole, the flexible piece is restored to the original unpressed state by its elasticity, and the engaging protrusion and the engaging hole are engaged. Match. As a result, even if the connector is pulled, the engaging protrusion cannot pass through the guide groove, so that the connector is kept engaged in the housing. In addition, since a plurality of engagement mechanisms are provided, even if one of the engagement mechanisms is inadvertently released, the other engagement mechanisms remain engaged and the connector is detached from the housing. There is nothing.

  Further, in the indwelling needle set according to the present invention, a needle tip protector is installed on the inner needle insertion port side in the housing, and a metal needle insertion hole that can be engaged with the metal needle in the needle tip protector. When the metal needle is located in the metal needle insertion hole, the side of the metal needle is pressed against a predetermined portion of the housing to keep the needle tip protector fixed in the housing. When the metal needle is pulled out from the metal needle insertion hole, an elastic member that releases the pressure on the predetermined portion of the housing when pulled out from the needle insertion hole and makes the needle tip protector movable is provided. The tip protector may be pulled out of the housing together with the metal needle in a state where the tip of the metal needle is covered.

  With this configuration, when the inner needle is removed from the outer needle after puncturing the patient's blood vessel with the tip of the outer needle and the inner needle, the needle tip protector covers the inner needle with the tip of the inner needle covered. At the same time, it is removed from the outer needle. For this reason, the operator is not injured at the tip of the inner needle, and safety is improved.

  Hereinafter, an indwelling needle set according to the present invention will be described with reference to the drawings. FIG. 1 shows an indwelling needle set A according to the embodiment, and the indwelling needle set A is configured by an indwelling needle or the like placed in a patient's blood vessel. That is, the indwelling needle set A includes an accommodation case 10, an outer needle 20 that is inserted into a patient's blood vessel, an inner needle 30 having a tip portion that can be inserted into the outer needle 20, and a rear end portion of the outer needle 20. It is comprised with the connector 40 which can be connected to. The housing case 10 includes a case main body 11 that houses the outer needle 20 and the inner needle 30 assembled as shown in FIG. 2, and a connector housing portion 12 that houses the connector 40.

  The case body 11 is composed of a long cylindrical container with one end closed, and a long cap-shaped lid portion 13 that opens and closes the opening of the case body 11 is detachably attached to the other end opening. The other end of the lid 13 is detachable from one end of the connector housing 12. The connector accommodating part 12 is comprised by the short cylindrical container by which the end was obstruct | occluded, and the short cap-shaped cover part 14 which opens and closes the opening of the connector accommodating part 12 to the other end opening part is attached so that attachment or detachment is possible. For this reason, the housing case 10 houses the outer needle 20 and the inner needle 30 in an assembled state in the case main body 11 and the lid portion 13 so as to be freely inserted and removed, and the connector housing portion 12 and the lid portion 14 The connector 40 is accommodated inside and out. Then, by assembling the lid portion 13 and the connector housing portion 12, they can be integrated.

  As shown in FIGS. 3 and 4, the outer needle 20 includes a thin tubular cannula 21 and a housing 22 connected to the base of the cannula 21 (the rear end located on the right side in the drawing). The housing 22 is formed at the center of the housing main body 22a constituting the main body portion of the housing 22, the connecting portion 22b connecting the cannula 21 and the housing main body 22a, and the rear end of the housing main body 22a. The connection part 22c for connecting the connector 40 to the needle | hook 20 is comprised.

  The tip of the cannula 21 is placed in the blood vessel of the patient, and blood is taken out from the blood vessel or a chemical solution or the like is supplied to the blood vessel. The connecting portion 22b is formed in a tapered cylindrical shape with a thin front end, the rear end portion of the cannula 21 is connected to the small diameter side front end portion, and the housing main body 22a is connected to the large diameter side rear end portion. Yes. The housing main body 22a is connected to the connection portion 22b so as to cover the outer periphery of the rear end portion of the connection portion 22b, and the inner periphery of the rear end portion is a flange shape whose inner diameter is set to be substantially the same as the inner diameter of the connection portion 22b. The protrusion 23 is formed. A filter 24 and a valve body 25 are provided side by side between the rear end surface of the connection portion 22b and the protrusion 23 inside the housing body 22a.

  The filter 24 is formed by forming a hydrophobic material into a ring shape, and has a property of allowing a gas such as air to pass through but not a liquid such as blood. The valve body 25 is made of isoprene rubber having elasticity, and an opening / closing hole 25a is formed in a portion along the central axis. The opening / closing hole 25a is normally kept closed as shown in FIG. 5, but when the inner needle 30 is inserted into the outer needle 20 as shown in FIGS. As described above, when the connector 40 is inserted into the outer needle 20, the distal end side insertion portion of the inner needle 30 and the distal end side insertion portion of the connector 40 can be liquid-tightly passed. In addition, a gas passage 26 is formed at the boundary between the housing body 22a and the connection portion 22b to discharge the gas that has passed through the filter 24 from the inside of the connection portion 22b to the outside.

  The connecting portion 22c is formed in a cylindrical shape having a short axial length whose inner diameter is set to be approximately the same as the outer diameter of the housing body 22a. And the guide groove 27 extended in the center side along the axial direction of the connection part 22c from the rear-end edge part of the connection part 22c is formed in the upper part and the lower part of the connection part 22c, respectively, and the back end part of the guide groove 27 is formed. An engagement hole 28 is formed. As shown in FIG. 6, the guide groove 27 is formed so that the rear end side is wide and gradually becomes narrower toward the front end side, and the engagement hole 28 has the narrowest portion 27 a of the guide groove 27. It is comprised by the substantially circular hole which became larger in diameter than the width | variety.

  As shown in FIG. 7, the inner needle 30 includes a stainless steel metal needle 31, a hub 32 fixed to a proximal end portion of the metal needle 31 (a rear end located on the right side in the drawing), and a hub 32. And a plug 33 that is detachably attached to the rear end portion. The metal needle 31 is made of a thin tubular injection needle, and is composed of a pointed portion formed with an end portion 31a inclined with respect to the axial direction. Further, a step portion 31b is formed in the rear end portion of the metal needle 31 slightly from the front end portion 31a, and the diameter on the front end side is slightly larger than the diameter on the rear end side across the step portion 31b. Is set to The metal needle 31 is used to smoothly insert the distal end portion of the cannula 21 into the patient's blood vessel. The metal needle 31 is inserted from the rear end portion of the outer needle 20 and the valve body 25 is inserted. The distal end portion 31a is projected from the distal end opening of the cannula 21 through the open / close hole 25a.

  The hub 32 is a portion that functions as a grip portion for holding the inner needle 30, and is fixed to the metal needle 31 so as to cover the outer peripheral portion of the rear end portion of the metal needle 31. The hub 32 is located in the center portion and has a hub main body 32a for fixing the metal needle 31, and a cylindrical shape formed on the front side of the hub main body 32a with a predetermined distance from the peripheral surface of the metal needle 31. The housing part 32b and the cylindrical plug attachment part 32c provided with the recessed part formed in the rear part side of the hub main body 32a and opened toward back are comprised. A flange-shaped flange 32d is formed on the peripheral edge of the front end of the accommodating portion 32b.

  The plug 33 is used as a lid for opening and closing the opening of the plug attachment portion 32c, and a cylindrical plug portion 33a that can be detachably pushed into the recess of the plug attachment portion 32c, and a plug portion 33a. It is comprised by the holding part 33b provided with the recessed part fixed to the edge part and opening toward back. And the filter 33c made from a cellulose is provided in the back end part in the recessed part of the holding part 33b. The filter 33c is configured to allow air to pass but not blood.

  The outer needle 20 and the inner needle 30 configured in this way are assembled as shown in FIG. 2 before use, and at that time, at the boundary between the outer needle 20 and the inner needle 30. A needle point protector 35 is installed. The needle tip protector 35 is configured as shown in FIG. 8, and includes a cylindrical box-shaped spring accommodating portion 36 that can be inserted into the connecting portion 22 c of the outer needle 20, and an inner portion 32 b of the inner needle 30. And a cylindrical insertion portion 37 that can be inserted into the housing. A locking portion 36 a is provided at a portion slightly below the center in the vertical direction in the spring accommodating portion 36, and a protruding hole 36 b is provided on the upper surface of the spring accommodating portion 36. In addition, an insertion hole 36c through which the metal needle 31 can be inserted is provided at the approximate center of the front surface of the spring accommodating portion 36.

  Further, between the locking portion 36a in the spring accommodating portion 36 and the upper surface portion of the spring accommodating portion 36, the elevating platform 38a, extending upward from the center of the upper surface of the elevating platform 38a and extending outward from the projecting hole 36b. An elevating member 38 comprising a protruding bar 38b that can be protruded is provided. And the stainless steel coil spring 39 is attached to the outer periphery of the protrusion bar 38b. The diameter of the coil spring 39 is set larger than the diameter of the projecting hole 36b, and cannot protrude from the projecting hole 36b. Therefore, when the lifting platform 38a is moved upward, the projecting bar 38b projects outward from the projecting hole 36b, and the coil spring 39 contracts against the force that moves the lifting platform 38a upward.

  Further, an insertion hole 37 a having an inner diameter set to be substantially equal to the outer diameter of the distal end portion of the metal needle 31 is formed inside the insertion portion 37. A small diameter portion 37b having a slightly smaller inner diameter is formed at the rear end portion of the insertion hole 37a, and the step formed at the end of the small diameter portion 37b is associated with the step portion 31b of the metal needle 31. Is possible. The insertion hole 37a communicates with the insertion hole 36c through a space in the spring accommodating portion 36. The needle tip protector 35 thus configured is assembled to the inner needle 30 in a state where the metal needle 31 is inserted through the insertion holes 37a and 36c and the insertion portion 37 is inserted into the housing portion 32b. At that time, the needle tip protector 35 is connected to the connecting portion 22c of the outer needle 20 in a state where the elevating member 38 is pushed upward by the metal needle 31 and the protruding bar 38b is engaged in the engagement hole 28 of the housing 22. Installed inside. The needle tip protector 35 is maintained in a fixed state in the housing 22 by the engagement between the protruding bar 38 b and the engagement hole 28.

  As shown in FIG. 9, the connector 40 includes a base tube 41, a small-diameter insertion tube 42 extending forward from the distal end portion of the base tube 41, and a pair extending forward from the upper and lower portions of the outer peripheral portion of the distal end of the base tube 41. And a pair of elastic guide portions 44 extending forward from the left and right portions of the outer peripheral portion of the distal end of the base tube 41. The connector 40 is connected to an external tube member 46 (see FIGS. 14 and 15) and the like, and is used to send a chemical solution or the like supplied from the tube member 46 or the like to the outer needle 20. A threaded portion 41a for connecting ends of the tube member 46 and the like is formed on the outer peripheral portion.

  The insertion tube 42 is composed of a stepped tube having a uniform inner diameter, a large outer diameter 42a on the base tube 41 side, and a small insertion portion 42b on the distal end side. The insertion portion 42b has a valve body. 25 can be liquid-tightly inserted into the opening / closing hole 25a. In addition, the engaging protrusion 43 is a thin plate-like flexible piece 43a having elasticity extending from the outer periphery of the distal end of the base tube 41, and a short columnar shape protruding from the outer surface of the flexible piece 43a toward the outside. The engaging projection 43b. And the pressing part 45 as the engagement release part of the column-shaped this invention formed in the diameter smaller than the engagement protrusion 43b protrudes toward the outer side from the center part of the end surface of the engagement protrusion 43b. Further, the elastic guide portion 44 is formed of a rectangular thin plate extending from the outer peripheral portion of the distal end of the base tube 41.

  The connector 40 is connected to the housing 22 with the insertion part 42b inserted into the opening / closing hole 25a of the valve body 25 and the flexible piece 43a and the elastic guide part 44 inserted into the connection part 22c. At that time, as shown in FIG. 10, the engagement protrusion 43 b engages with the engagement hole 28, and the pressing portion 45 protrudes to the outside of the coupling portion 22 c. Further, when the connector 40 is attached to the housing 22 or when the connector 40 is detached from the housing 22, as shown in FIG. 11, the pressing portion 45 is pushed to the inner side of the connecting portion 22c to connect the engaging protrusion 43b. It is located inside the portion 22c. Accordingly, since the thickness of the pressing portion 45 is smaller than the width of the narrowest portion 27a of the guide groove 27, the pressing portion 45 can move in the guide groove 27, and the connector 40 can be attached to and removed from the housing 22. It becomes possible.

  The guide groove 27 and the engagement hole 28 constitute an engagement recess according to the present invention, and the flexible piece 43a and the engagement projection 43b constitute an engagement projection according to the present invention. The engagement recess and the engagement protrusion constitute an engagement mechanism according to the present invention. Further, the outer needle 20 and the connector 40 constitute an indwelling needle. Further, the housing case 10 constituting the indwelling needle set A is made of polystyrene, and the outer needle 20, the portion other than the metal needle 31 of the inner needle 30, the portion other than the coil spring 39 of the needle tip protector 35, and the connector 40 are: Consists of transparent or translucent polypropylene. The hub 32 of the inner needle 30 is made of a transparent material so that it can be confirmed when blood enters the inside through the metal needle 31.

  In this configuration, when the indwelling needle set A is used, first, as shown in FIG. 1, the outer needle 20 and the like housed in the housing case 10 are taken out, and the outer needle 20 and the inner needle 30 are attached. In the combined state, the tip of the cannula 21 is punctured into the patient's arm, for example, together with the tip 31a of the metal needle 31 to reach the blood vessel. As a result, blood in the blood vessel enters the metal needle 31 and enters the hub body 32 a of the hub 32. As a result, since the color of the hub 32 becomes red, it can be confirmed that the distal end portion 31a of the metal needle 31 has reached the blood vessel. At this time, the air in the metal needle 31 is pushed into the rear end side in the metal needle 31 by blood, passes through the filter 33c, and is discharged to the outside.

  Next, with the outer needle 20 left in the patient's blood vessel, the inner needle 30 is pulled toward the rear side of the outer needle 20 as shown in FIG. As a result, the insertion portion 37 of the needle tip protector 35 is removed from the housing portion 32b of the inner needle 30, and the metal needle 31 is removed while sliding on the peripheral surfaces of the opening / closing hole 25a of the valve body 25 and the insertion hole 37a of the insertion portion 37. Retreat from the needle 20. Further, the inner needle 30 is pulled toward the rear side of the outer needle 20, and when the distal end portion 31 a of the metal needle 31 passes through the spring accommodating portion 36 of the needle tip protector 35, it is lifted and lowered by the restoring force of the coil spring 39. The member 38 is lowered, and the engagement between the protruding bar 38b and the engagement hole 28 is released.

  As a result, the needle tip protector 35 becomes movable, and the needle tip is engaged by the engagement between the step portion 31b of the metal needle 31 and the step formed at the end of the small diameter portion 37b of the insertion hole 37a of the insertion portion 37. The protector 35 comes out of the housing 22 together with the metal needle 31, and is in the state shown in FIG. In this case, the metal needle 31 passes through the inside of the opening / closing hole 25a of the valve body 25, but the metal needle 31 and the inner peripheral surface of the opening / closing hole 25a are in close contact with each other. Blood does not leak out from 25a. In addition, after the inner needle 30 is extracted from the outer needle 20, the opening / closing hole 25 a is in a closed state, so that blood is not discharged from the rear end portion of the housing 22.

  Next, as shown in FIG. 14, the connecting portion 47 of the tube member 46 is connected to the base tube 41 of the connector 40. This connection is performed by engaging a threaded portion 41 a of the base tube 41 with a protrusion 47 a provided on the inner peripheral surface of the connecting portion 47. Then, the connector 40 is inserted into the housing 22 to obtain the state shown in FIG. In this case, as described above, the connector 40 is pushed into the housing 22 with both the pressing portions 45 of the connector 40 being pressed. Then, a chemical liquid supply device connected to the tube member 46 is operated to supply the chemical liquid or the like to the blood vessel. The indwelling needle set A is used as described above. When connecting the connector 40 to the housing 22, a small amount of chemical solution or the like is taken out from the insertion portion 42 b in advance. Thereby, air can be prevented from entering the cannula 21.

  Thus, in this indwelling needle set A, the guide groove 27 and the engagement hole 28 are provided in the housing 22, the connector 40 has a flexible piece 43 a that can be bent toward the central axis side, and an outer side of the flexible piece 43 a. An engagement protrusion 43b that is provided on the side surface and can be engaged with the engagement hole 28 but cannot pass through the guide groove 27 is provided. Furthermore, the pressing part 45 which consists of a protrusion is provided in the center part of the end surface of the engagement protrusion 43b. Therefore, the connector 40 can be easily connected to the outer needle 20 by inserting the connector 40 into the housing 22 in a state where the pressing portion 45 is pressed and the flexible piece 43a is bent. Further, it is possible to prevent the connector 40 from being detached from the outer needle 20 by the engagement between the engagement protrusion 43 b and the engagement hole 28.

  Further, when the connector 40 is removed from the outer needle 20, the engagement between the engagement protrusion 43 b and the engagement hole 28 can be released by pressing the pressing portion 45. By pulling 40 out of the housing 22, it can be easily removed from the outer needle 20. In addition, since two sets of engagement mechanisms each including the engagement protrusion and the engagement recess are provided, the engagement mechanism is not released unless both the pressing portions 45 are pressed, and the connector 40 is carelessly formed. Does not come off the outer needle 20.

  Further, the indwelling needle set according to the present invention is not limited to the above-described embodiment, and can be implemented with appropriate modifications. For example, in the above-described embodiment, the engaging concave portion is constituted by the guide groove 27 and the engaging hole 28. However, the guide groove 27 can be omitted and does not penetrate vertically, but the housing 22 It can also be comprised by the groove part formed in the inner surface. In this case, the pressing portion 45 passes through the inner side of the housing 22. In the above-described embodiment, the engagement between the engagement protrusion 43b and the engagement hole 28 is released by pressing the pressing portion 45 provided on the connector 40. However, the engagement hole is provided in the housing. In addition to providing the provided flexible piece, an engagement protrusion capable of engaging with the engagement hole can be provided on the inner peripheral surface of the connector. In this case, the engagement release portion is provided on the housing side.

  Further, in the above-described embodiment, the outer needle 20, the portion other than the metal needle 31 of the inner needle 30, the portion other than the coil spring 39 of the needle tip protector 35, and the connector 40 are made of polypropylene. The material to be used can be changed as appropriate. For example, the housing 22, hub 32, and connector 40 can be formed using materials such as polycarbonate, polyurethane, nylon, silicone, polyetherimide, polyetheretherketone, ABS resin, and polyethylene.

  The cannula 21 can be formed using a material such as fluororesin or polyurethane. Further, the valve body 25 can be formed using a material such as silicone, polyvinyl chloride, or soft urethane, and the coil spring 39 is formed using a material such as titanium, polyether ether ketone, or polycarbonate. be able to. Furthermore, the indwelling needle set according to the present invention can be used not only for blood vessels but also for intestinal sites such as the duodenum, renal pelvis, bladder and the like.

It is sectional drawing which showed the indwelling needle set which concerns on one Embodiment of this invention. It is sectional drawing which showed the state which assembled | attached the outer needle and the inner needle. It is the side view which showed the outer needle. It is sectional drawing of the outer needle shown in FIG. FIG. 5 is a sectional view taken along line 5-5 in FIG. It is the top view which showed the guide groove and the engagement hole. It is sectional drawing which showed the inner needle. It is sectional drawing which showed the needlepoint protector. The connector is shown, (a) is a top view, (b) is a side view, (c) is sectional drawing. The state which engaged the engagement protrusion with the engagement hole is shown, (a) is a top view, (b) is sectional drawing. It is sectional drawing which showed the state which engages an engagement hole and an engagement protrusion, or cancels | releases the engagement. It is sectional drawing which showed the state which pulls out an inner needle from an outer needle. It is sectional drawing which showed the state which pulled out the inner needle from the outer needle. It is sectional drawing which showed the state which connected the tube member to the connector. It is sectional drawing which showed the state which connected the connector to the outer needle.

Explanation of symbols

DESCRIPTION OF SYMBOLS 20 ... Outer needle, 21 ... Cannula, 22 ... Housing, 22a ... Housing main body, 22b ... Connection part, 22c ... Connection part, 25 ... Valve body, 25a ... Opening / closing hole, 27 ... Guide groove, 27a ... Narrowest part, 28 ... Engagement hole, 30... Inner needle, 31. Metal needle, 31 a. Tip portion, 32. Hub, 32 a. Hub body, 32 b .. housing portion, 32 c. Plug mounting portion, 40. ... insertion tube, 42b ... insertion part, 43 ... engagement protrusion, 43a ... flexible piece, 43b ... engagement protrusion, 45 ... pressing part, A ... indwelling needle set.

Claims (2)

An outer needle (20) comprising a cannula (21) having a lumen, and a housing (22) connected to the base of the cannula and provided therein with a flow path communicating with the lumen of the cannula;
It comprises a metal needle (31) that has a lumen and can be inserted into the outer needle with the tip protruding from the tip opening of the cannula, and a hub (32) connected to the base of the metal needle. An inner needle (30) ;
A valve provided in the housing and capable of fluid-tightly passing a metal needle inserted into the outer needle and having an opening / closing hole (25a) for closing the flow path when the metal needle is not inserted. Body (25) ,
An insertion tube (42) that can be fluid-tightly inserted into the opening / closing hole of the valve body, and when the inner needle is removed from the outer needle, the insertion tube is inserted through the opening / closing hole, An indwelling needle set (A) comprising a connector (40) connectable to the housing of the outer needle,
The housing and the connector include an engagement protrusion (43) and an engagement recess (27, 28), and one side of the engagement protrusion and the engagement recess is connected to the housing or the connector. A plurality of engagement mechanisms that can be released by pressing from the outer peripheral surface side toward the central axis side are provided, and one side of the engagement protrusion and the engagement recess is formed from the outer peripheral surface side of the housing or the connector. An indwelling needle set provided with an engagement release portion (45) for pressing toward the central axis. The engaging mechanism is provided in communication with the guide groove (27) provided from the insertion port side end of the connector toward the cannula side in the housing and the back end of the guide groove. An engagement recess comprising an engagement hole (28) having a width greater than the width of the back end of
A flexible piece (43a) that is provided on the connector and can be inserted into the housing and can be bent toward the central axis of the connector, and provided on an outer surface of the flexible piece. together and a width greater than the width of the inner end portion of the guide groove, the engagement projection consisting of said engaging engagement protrusion engageable with the engagement hole enters the engagement hole (43 b) and (43) Consisting of
The engagement releasing portion is provided on the outer end face of the engaging projection, the guide groove is constituted by the pressing portion (45) capable of crossing the center of the friendly FLEXIBLE piece by pressing the pressing portion and the connector The indwelling needle set according to claim 1, wherein the engagement concave portion and the engagement protrusion can be engaged with each other by being bent toward the shaft side, or the engagement can be released.

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