JP5485800B2 - Needle cap, blood purification device and crust remover - Google Patents

Description

  The present invention relates to a needle cap, a blood purification treatment instrument, and a crust remover.

  For example, when blood purification treatment such as dialysis treatment is performed, a needle is inserted into the patient's skin, and blood is collected and returned from the needle. This puncture needs to be performed every time the blood purification treatment is performed, but each time it gives great pain to the patient. Therefore, in recent years, in order to reduce pain at the time of puncture, a method of forming a puncture route leading to a blood vessel in the body skin at the first time and performing puncture using the puncture route from the second time onward is performed. In the second and subsequent punctures of this method, the scab formed at the entrance of the puncture route is taken and a needle is inserted into the puncture route from the entrance. According to this method, in the second and subsequent punctures, it is not necessary to make a hole in the skin with a needle, so pain is reduced.

  However, in the above-described method, since the crust was conventionally taken using a needle tip, the skin was easily damaged and the needle was contaminated, which was not preferable for hygiene. Thus, it has been proposed to provide a tip at the tip of the needle cap that is put on the needle before use, and to remove the crust using the tip (see Patent Document 1).

Special table 2009-542343 gazette

  However, since the tip of the tip of the needle cap described above is formed toward the front side in the longitudinal direction, for example, the thin tip of the needle cap is inserted between the skin and the crust at the time of use, and the needle cap is moved in the longitudinal direction. It is necessary to move it forward and push up and peel off the crust. For this reason, it becomes difficult to see a crust with an operator's finger | toe or a needle cap itself, and the said operation | work becomes difficult. As a result, it is easy to damage the skin by touching the tip of the wrong place, and the work takes time. Further, when aligning between the skin and the crust while moving the tip of the needle cap back and forth, or when peeling the crust, the needle cap and the skin are easily rubbed and the skin is easily damaged.

  The present invention has been made in view of the above points, and provides a needle cap and a blood purification treatment instrument that can easily remove the crust and can take the crust without damaging the skin. For that purpose.

  The present invention that achieves the above object is a needle cap into which a needle for puncturing the body is inserted, and a crust removing part is formed at a tip part, and the crust removing part is a needle insertion shaft. An arcuate outer peripheral surface that curves around and an inner surface located inside the outer peripheral surface, and an acute apex having a width in the insertion axis direction of the needle is formed by the outer peripheral surface and the inner surface. .

  According to the present invention, the apex of the needle cap is formed with an acute apex that is wide in the direction of the insertion axis of the needle, so the apex is rotated around the insertion axis of the needle to Can be taken. By doing so, the field of view is not obstructed by the finger or the needle cap itself during the work of removing the crust, and the contact portion between the top side and the crust becomes easy to see. Moreover, since the width | variety is made in the top side part which takes a crust, the operation | work which aligns a top side part with a crust becomes easy to perform. Therefore, the crust removal operation can be easily performed, and the crust can be removed without damaging the skin.

  The tip portion may be formed with a protruding portion that protrudes further forward than the top side portion and has a flat front surface. In order to maintain sterility before use, a needle with a needle cap is contained and transported in a sealed sterile bag. According to the present invention, since the protruding portion having a flat front surface is formed at the distal end portion of the needle cap, for example, it is possible to prevent a sterile bag from being pierced by the distal end portion of the needle cap during transportation. Therefore, the needle can be properly transported. Further, since the front surface of the tip portion of the needle cap is flat, the strength of the tip portion of the needle cap against a collision with another can be improved.

  The protruding portion is formed on the left and right center lines as viewed from the front of the distal end portion from the proximal end of the distal end portion toward the front side, and the outer peripheral surface of the crust removing portion extends from the protruding portion to the distal end It may be formed in a direction away from the protruding portion along the circumferential direction of the portion, and the apex portion may be formed on an end side in a direction away from the outer peripheral surface. In such a case, since the protrusion is formed on the left and right center lines of the tip of the needle cap, the strength of the tip can be increased. For this reason, for example, the thickness of the crust removing portion can be reduced, so that the angle of the apex portion can be made more acute. Therefore, it becomes easier to perform the crust removal work.

  The crust removing part may be formed on both the left and right sides of the protruding part. In such a case, the crust can be removed from either the left or right side, and the crust can be removed from a more easily viewable direction.

  The crust removing part is formed on both sides of the left and right center lines viewed from the front of the tip part, and the apex parts on both sides are formed to be opposite to each other in the circumferential direction of the tip part. May be. In such a case, the crust can be removed from either the left or right side, and the crust can be removed from a more easily viewable direction.

  The inner surface may be convexly curved toward the outer peripheral surface side. In such a case, the crest can be more easily removed because the angle of the top side can be made more acute.

  According to another aspect of the present invention, there is provided a needle cap into which a needle for puncturing a body is inserted, wherein a crust removing portion is formed at a distal end portion, and the crust removing portion is in a direction of an insertion axis of the needle. And an inner surface located on the inner side of the outer surface, and the outer surface and the inner surface form an acute apex having a width in the insertion axis direction of the needle.

  According to the present invention, the apex of the needle cap is formed with an acute apex that is wide in the direction of the insertion axis of the needle, so the apex is rotated around the insertion axis of the needle to Can be taken. By doing so, the field of view is not obstructed by the finger or the needle cap itself during the work of removing the crust, and the contact portion between the top side and the crust becomes easy to see. Moreover, since the width | variety is made in the top side part which takes a crust, the operation | work which aligns a top side part with a crust becomes easy to perform. Therefore, the crust removal operation can be easily performed, and the crust can be removed without damaging the skin.

  The tip portion of the needle cap may be formed with a protruding portion that protrudes further forward than the top side and has a flat front surface.

  The projecting portion is formed from the base end of the distal end portion toward the front side on the left and right center lines as viewed from the front of the distal end portion, and the outer surface of the crust removing portion is formed beside the projecting portion. The apex portion may be formed on the outer side of the outer surface that is far from the protruding portion. Moreover, the said crust removal part may be formed in the both right and left sides of the said protrusion part.

  The crust removing part is formed on both sides of the left and right center lines viewed from the front of the tip part, and the apex parts on both sides are formed to be opposite to each other on the left and right of the tip part. It may be. The inner surface may be convexly curved toward the outer surface.

  The inner surface of the crust removing part may be inclined in the direction of the insertion axis of the needle so that the inner surface gradually becomes thinner toward the front surface. In this case, since a thick portion and a thin portion are formed in the crust removing portion, the crust can be removed using a portion that is easier to use according to the shape and size of the crust.

  The needle cap may be used for a needle that is punctured during blood purification treatment. The needle cap may be used for a needle that is punctured during administration of a drug solution or blood collection.

  According to another aspect of the present invention, there is provided the above-described needle cap, a needle inserted into the needle cap, a tube having the needle connected to the tip, and a rear end of the tube to connect to another tube. A blood purification instrument that can constitute a part of the blood purification circuit.

  Another aspect of the present invention is a crust remover attached to a needle cap, which has one side parallel to the long axis direction and another side that is oblique, and has a sharper tip by these two side surfaces. Is a scab remover for buttonhole puncture.

  The crust remover may be integrated with a needle cap. Moreover, the said crust removal tool may be fixed to the puncture needle insertion aseptic bag.

  According to the present invention, it is possible to easily remove the crust and to remove the crust without damaging the skin.

It is a figure which shows the outline of a structure of the instrument for blood purification treatment. (A) is the side view of a needle cap, (b) is the front view which looked at the front-end | tip part of the needle cap from the front. It is a figure which shows the outline of a structure of the blood purification circuit. It is a figure which shows the state which removes a crust with a needle cap. It is a figure which shows the state which removes a crust at the front-end | tip part of a needle cap. It is the front view which looked at the front-end | tip part of a needle cap in case a crust removal part exists only in one side from the front. It is the front view which looked at the front-end | tip part of the needle cap which has the inner surface where the plane inclined. (A) is a side view of a needle cap having a protrusion, and (b) is a top view of the needle cap having a protrusion. It is the front view which looked at the front-end | tip part of the needle cap which has a protrusion part from the front. (A) is a side view of the needle cap when the inner surface is inclined obliquely forward, (b) is the front end of the needle cap when the inner surface is inclined obliquely forward from the front FIG. (A) is a side view of a needle cap having another crust removing portion, and (b) is a front view of the front end portion of the needle cap having another crust removing portion as viewed from the front. It is a front view of the needle cap which shows the crust removal part which has the curved inner surface. It is a front view of the needle cap when it has a crust removing part on the left and right. It is a front view of the needle cap which shows the crust removal part which has a protrusion part. It is a side view of a crust removal tool. It is a top view of a crust removal tool.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view showing an example of a blood purification treatment instrument 2 having a needle cap 1 according to the present embodiment.

 The needle cap 1 is formed in a substantially cylindrical shape into which the needle 10 can be inserted, for example. The needle cap 1 has an opening 1a formed at the rear end in the longitudinal direction (the insertion axis direction X of the needle 10), and the needle 10 can be inserted through the opening 1a. A crust removing portion 11 is formed at the distal end portion 1 b of the needle cap 1.

  For example, as shown in FIGS. 2 (a) and 2 (b), the crust removing portion 11 has an arcuate outer peripheral surface 11a that is curved around the insertion axis A of the needle 10 and an inner surface that is located inside the outer peripheral surface 11a. 11b. The outer peripheral surface 11a and the inner surface 11b form an acute apex portion 11c having a width in the insertion axis direction X of the needle 10. The acute angle B of the apex portion 11c is sharp if it is small and easy to insert between the crust and the skin, but the strength decreases. If it is large, the strength increases, but it becomes difficult to insert. Preferably, 5 degrees to 25 degrees is more preferable.

  The outer peripheral surface 11a is formed up to, for example, about 90 degrees in a direction away from the bottom 11d, starting from a bottom 11d through which the left and right center lines C of the tip 1b pass. The radius of the outer peripheral surface 11a is preferably about 0.5 to 5.2 mm, for example. The inner surface 11b is formed in a convex curved shape on the outer peripheral surface 11a side. The outer peripheral surface 11a and the inner surface 11b intersect at an acute angle to form a top side portion 11c. The apex part 11c is formed horizontally in the insertion axis direction X of the needle 10, and has a width of about 0.5 to 5.2 mm, for example.

  The crust removing portion 11 is formed so as to be symmetrical with respect to the center line C on both sides of the center line C. Each crust removing portion 11 is formed such that the top side portion 11c is opposite to each other in the circumferential direction of the tip end portion 1b. That is, in FIG. 2B, the left apex portion 11c is directed clockwise, the right apex portion 11c is directed counterclockwise, and both are directed upward. The left and right crust removing portions 11 make the entire left and right crust removing portions 11 have a crescent crescent shape. That is, the entire crust removing portion 11 is composed of a semicircular arc-shaped outer peripheral surface 11a and an inner surface 11b, and apex portions 11c are formed on both sides.

  The top side 11c of the crust remover 11 needs to be sharp enough to peel off the crust, while the sharpness does not damage the skin when removing the crust and is a sterile bag for transportation. It is necessary to suppress it to such an extent that it cannot be broken.

  The material of the needle cap 1 is not particularly limited, but for example, a resin material or a metal material is used. For example, the needle cap 1 may be molded from a synthetic resin material. In such a case, an appropriate strength can be designed, and a complicated structure can be manufactured at a low cost. Furthermore, it can be incinerated as medical waste. The synthetic resin material is preferably a material that can be injection-molded and can withstand sterilization. Sterilization includes EOG sterilization, autoclave sterilization, gamma ray sterilization, electron beam sterilization, and the like, and any material that can handle at least one of these is preferable. Specifically, polypropylene, polyethylene, polytetrafluoroethylene, ABS resin (acrylonitrile / butadiene / styrene), polycarbonate and the like are preferably used. The size of the needle cap 1 varies depending on the needle outer diameter and the hub diameter, but the inner diameter / outer diameter is preferably 1 mm / 2 mm to 5 mm / 8 mm, and the length is preferably about 20 mm to 60 mm.

  The needle cap 1 is applied to a blood purification instrument 2 as shown in FIG. The blood purification treatment instrument 2 includes, for example, a needle 10 punctured by a patient during blood purification treatment, a needle cap 1, a tube 20 having the needle 10 connected to a distal end portion, and a rear end portion of the tube 20 as another tube. It has the connection part 21 for connecting to. A holding portion 22 that is held by an operator when the needle 10 is moved is provided in a portion near the needle 10 of the tube 20. A clamp 23 is attached to the tube 20. A cap 24 is fitted to the connection portion 21. The needle 10 may be a normal needle with high sharpness that forms a puncture route, or may be a dull needle with low sharpness that is inserted into the puncture route. The material of the needle 10 may be a metal needle such as stainless steel or a plastic needle.

  The blood purification treatment instrument 2 can be applied to a blood purification circuit 30 as shown in FIG. 3, for example. The blood purification circuit 30 includes, for example, a blood purification device 40 such as a hollow fiber module that purifies blood by separating and adsorbing blood components, a blood collection circuit 41 that supplies the collected blood to the blood purification device 40, blood A blood return circuit 42 for returning the blood that has passed through the purifier 40 is provided. The blood collection circuit 41 is provided with a pump 43. The blood purification processing instrument 2 is attached to, for example, an end section on the blood collection side of the blood collection circuit 41 and an end section on the blood return side of the blood return circuit 42, and constitutes a part of the blood purification circuit 30. . The blood purification circuit 30 can be used for blood purification processes such as dialysis, plasma exchange, plasma adsorption, and blood component removal.

  When blood purification processing is performed using the needle cap 1 and blood purification processing instrument 2 configured as described above, for example, the blood purification processing instrument 2 is taken out of the sterile bag, and blood as shown in FIG. Connected to both ends of the purification circuit 30. Next, the patient's crust is removed using, for example, the needle cap 1 of the blood purification apparatus 2. At this time, for example, as shown in FIGS. 4 and 5, an operator removes the crust removing part 11 of the needle cap 1 in the vicinity of the crust D of the arm E, and the apex part 11 c of the crust removing part 11 Inserted between D and skin F. After that, the crust removing part 11 is rotated around the insertion axis A of the needle 10, the top side part 11 c is rotated, and the crust D is peeled off. Thereafter, the needle cap 1 is removed, the needle 10 is inserted into the puncture route R from which the crust D has been removed, and the needle 10 is inserted into the blood vessel G under the skin F. Thereafter, blood is collected and returned from the needle 10, and blood purification processing is performed using the blood purification circuit 30.

  According to the above embodiment, since the apex portion 11c having an acute angle having a width in the insertion axis direction X of the needle 10 is formed at the distal end portion 1b of the needle cap 1, the apex portion 11c is attached to the needle 10 as shown in FIG. The scab D can be peeled off by rotating around the insertion axis A. By doing so, the field of view is not obstructed by the finger or the needle cap itself during the work of taking the husk D, and the contact portion of the crest 11c and the husk D becomes easy to see. Moreover, since the width | variety is made in the top side part 11c which peels off the crust D, it becomes easy to perform the operation | work which aligns the top side part 11c with the crust D. Therefore, the crust removal operation can be easily performed, and the crust can be removed without damaging the skin.

  In the above embodiment, the crust removing part 11 is formed on both sides of the center line C on the left and right of the tip 1b of the needle cap 1, and the apex parts 11c on both sides are mutually in the circumferential direction of the tip 1b. It is formed so as to be reversed. For this reason, since the peeling operation | work of the scab D can be performed from either right and left, the scab D can be taken from the direction where it is easier to see.

  Since the inner surface 11b of the crust removing portion 11 is convexly curved toward the outer peripheral surface 11a, the crest D can be removed more easily because the angle of the apex portion 11c can be made more acute.

  The needle cap 1 is used for a normal needle or a dull needle that is punctured during blood purification processing, and since the crust D can be easily removed in blood purification processing performed multiple times on the same patient, The speed and efficiency can be improved, and the burden on the patient can be reduced.

  In the above embodiment, the crust remover 11 is provided on both sides of the left and right center lines C. However, for example, as shown in FIG. Moreover, although the inner surface 11b of the above-mentioned crust removing portion 11 is convexly curved toward the outer peripheral surface 11a side, the flat surface may be inclined as shown in FIG.

  In the needle cap 1 described in the above embodiment, a protruding portion may be formed on the distal end portion 1b. Hereinafter, such a case will be described. For example, as shown in FIG. 8A, FIG. 8B, and FIG. 9, the tip portion 1b of the needle cap 1 has a protruding portion 50 that protrudes forward from the top portion 11c and has a flat front surface 50a. Is done. For example, the protrusion 50 is formed in a quadrangular prism shape that is long in the insertion axis direction X of the needle 10 and is formed on the center line C from the proximal end of the distal end portion 1b toward the front side. The protrusion 50 is formed to have a width of 0.2 to 4.0 mm and a height of 0.2 to 5.2 mm, for example. The outer peripheral surface 11a of the crust removing portion 11 is formed toward the direction away from the projecting portion 50 along the circumferential direction of the tip portion 1b from the projecting portion 50, and the apex portion on the end side in the direction away from the outer peripheral surface 11a. 11c is formed. The inner surface 11 b is formed from the top side portion 11 c to the side surface of the protruding portion 50. The crust removing part 11 is formed on both the left and right sides of the protruding part 50. In addition, in this example, since the other structure is the same as that of the said embodiment, description is abbreviate | omitted using the same code | symbol.

  According to such an example, since the protruding portion 50 is formed at the distal end portion 1b of the needle cap 1, for example, it is possible to prevent a sterile bag from being pierced by the distal end of the needle cap 1 during transportation. Therefore, the needle 10 can be transported properly.

  Moreover, since the protrusion part 50 is formed on the left-right centerline C of the front-end | tip part 1b of the needle cap 1, the intensity | strength of the front-end | tip part 1b can be raised. Thereby, since the thickness of the crust removing part 11 can be made thin, for example, the angle of the top part 11c can be made an acute angle. Therefore, the work of removing the husk D can be performed more easily.

  Since the crust removing part 11 is formed on both the left and right sides of the protruding part 50, the crust D can be removed from either the left or right side, and the crust can be taken from a more easily viewable direction.

  In this example as well, the crust removing part 11 may be provided only on one side of the protruding part 50. Further, the protruding portion 50 may have another shape such as a columnar shape. Moreover, although the intensity | strength of the front-end | tip part 1b of the needle cap 1 changes with raw material characteristics and the structure of a molding, the characteristic which does not pierce with the load of 3000 mN or less by the evaluation experiment with respect to silicon rubber is preferable. In this evaluation experiment, a load measuring device (MODEL-1605N: manufactured by Aiko Engineering Co., Ltd.) was used to puncture a silicon rubber (SR-50; manufactured by Tiger Polymer Co., Ltd.) with a thickness of 1.05mm and 40mmΦ with a 17G needle, 1 is pressed and the presence or absence of piercing and the load at the time of piercing are measured. In this experiment, the conventional needle cap was pierced with a load of less than 2700 mN, and the needle cap 1 with the protrusion 50 of the present embodiment was not pierced with a load of 3000 mN or less. Details of this are described in the examples.

  In the above embodiment, for example, as shown in FIG. 10, the inner surface 11 b may be inclined in the insertion axis direction X of the needle 10 so that the crust removing portion 11 gradually becomes thinner as it approaches the front surface. In such a case, since a thick portion and a thin portion are formed in the crust removing portion 11, the crust D can be removed using a portion that is easier to use depending on the shape and size of the crust D. In addition, this example is applicable also to the needle cap 1 without the protrusion part 50 mentioned above.

  In the crust removing portion 11 described in the above embodiment, instead of the outer peripheral surface 11a, a planar outer surface 11a along the insertion axis direction X of the needle as shown in FIGS. 11 (a) and 11 (b). May be formed. The other configuration is the same as that in the above-described embodiment, and an acute apex portion 11c having a width in the insertion axis direction X of the needle 10 is formed by the outer surface 11a and the inner surface 11b. Also in this example, since the crest D can be peeled off by rotating the apex portion 11c around the insertion axis A of the needle 10, the field of view is not hindered by the finger or the needle cap itself when removing the crust D. The contact portion between the apex portion 11c and the crust D is easy to see. Moreover, since the width | variety is made in the top side part 11c which peels off the crust D, it becomes easy to perform the operation | work which aligns the top side part 11c with the crust D. Therefore, the crust removal operation can be easily performed, and the crust can be removed without damaging the skin.

  In this example, the inner surface 11b is flat. However, as described in the above embodiment, the inner surface 11b may be convexly curved toward the outer surface 11a as shown in FIG. Further, as shown in FIG. 13, the crust removing portions 11 are formed on both sides of the left and right center lines C, and the apex portions 11c on both sides are opposite to each other on the left and right of the tip portion 1b. It may be formed. Further, as described in the above embodiment, the protruding portion 50 may be formed on the distal end portion 1b as shown in FIG. The outer surface 11 a is formed on both the left and right sides of the protruding portion 50, and the top side portion 11 c is formed on the outer end side far from the protruding portion 50. The outer surface 11a may be formed only on one side of the protruding portion 50.

  In another aspect, the present invention may be a crust remover for buttonhole puncture attached to a needle cap. For example, as shown in FIGS. 15 and 16, the scab removing device 60 has, for example, a triangular plate-shaped tip portion 60a and a columnar or prismatic base portion 60b to which the tip portion 60a is connected. . The distal end portion 60a has one side surface 60c parallel to the long axis direction H of the cylindrical needle cap 70 and another oblique side surface 60d, and a sharp distal end 60e is formed by these side surfaces 60c and 60d. Yes. Further, the base portion 60 b is connected to the needle cap 70. According to this example, it is possible to easily remove the crust using the tip 60c, and it is possible to remove the crust without damaging the skin.

  The crust remover 60 may be integrated with the needle cap 70, or the needle cap 70 may be fitted separately. Moreover, the crust remover 60 may be fixed to a puncture needle holder aseptic bag. In this case, it is possible to prevent the sharp tip of the crust remover 60 from breaking the sterile bag during transportation.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the idea described in the claims, and these naturally belong to the technical scope of the present invention. It is understood.

  For example, in the above-described embodiment, the needle cap 1 is used for the needle 10 that is punctured during blood purification processing. However, the needle cap 1 may be used for a needle that is punctured when administering a drug solution or collecting blood with a syringe or the like. The present invention is applicable.

  Below, the result of having performed the performance evaluation experiment about the needle cap which has the front-end | tip part of the specific shape in the said embodiment is shown. Evaluation experiment 1 is an experiment for evaluating the piercing performance of the tip of the needle cap, and evaluation experiment 2 is an experiment for evaluating the crust removal performance.

(Evaluation Experiment 1)
Evaluation Experiment 1 uses a load measuring instrument (MODEL-1605N: manufactured by Aiko Engineering Co., Ltd.) and punctures it with a 17G needle into a silicon rubber (SR-50; manufactured by Tiger Polymer Co., Ltd.) having a thickness of 1.05 mm and 40 mmΦ, and then each sample. The tip 1b of the needle cap 1 was pressed, and the presence or absence of piercing and the load at the time of piercing were measured. As experimental conditions, the piercing speed was 50 mm / min at a room temperature of 26 ° C. The results of this evaluation experiment 1 are shown in Table 1.

  The sample of Example 1 is the needle cap 1 having the protruding portion 50 as shown in FIG. 10, and the inner surface 11b and the top side portion 11c are inclined forward. The sample of Example 2 is the needle cap 1 having the protruding portion 50 as shown in FIG. 8, and the inner surface 11b and the top side portion 11c are not inclined but are horizontal. The sample of Example 3 is a needle cap 1 having the same protrusion 50 as that of Example 2, and the inner surface 11b is not curved and is inclined on a plane as shown in FIG. The sample of the comparative example 1 is a needle cap in which a tip pointed to the front side is formed as described in JP-T-2009-1554243.

In Comparative Example 1, silicon rubber was pierced with a load of 2543 mN, whereas in Examples 1 to 3, the silicon rubber was not pierced even when a load of 3000 mN was applied.

(Evaluation Experiment 2)
Evaluation experiment 2 was performed on a dialysis patient by performing a peeling work of wrinkle fatigue using a needle cap of each sample, and measuring a peeling state and a crust removing time at that time. Evaluation experiment 2 was that puncture fatigue was formed by the last puncture on the second dialysis day for 4 patients with end-stage renal failure hemodialysis who had been undergoing hemodialysis 3 times a week for more than 3 years after the introduction of dialysis. Enforced in the upper arm shunt. The results of this evaluation experiment 2 are shown in Table 2. Moreover, the same sample as the sample of the evaluation experiment 1 was used for the samples of Examples 1 to 3 and Comparative Example 1. The sample of Comparative Example 2 is a 17G injection needle (manufactured by Terumo). The sample of Comparative Example 3 is a 17G AVF dull needle (manufactured by Nipro Corporation). Here, the reason why the injection needle and the AVF dull needle are used for removing the crust as Comparative Examples 2 and 3 is that the crust is often removed using a needle in a medical field.

  The peeling condition of heel fatigue is evaluated in four stages, and the scab removal time is the time when the blood purification treatment instrument having each sample is taken out from the sterile bag, then the scab is peeled off with the sample, and then the puncture is started with the needle The total crust removal time until the crust and the crust removal time for removing the crust were measured.

  In Comparative Example 1, as for the peeling state, the hand was difficult to see, the peeling state evaluation was poor due to peeling by sliding the skin, and the crust removal time was long. Also, the total rind removal time was a cautious operation because the cap was sharp, and the time was longer.

  The peeling conditions of Comparative Example 2 and Comparative Example 3 were 2 and normal. In Comparative Example 2, since the operation to take out another AVF dull needle from the aseptic bag after the crust was removed, the total crust removal time became longer. Further, in Comparative Example 3, it is necessary to disinfect the needle with alcohol cotton in order to sterilize except the crust adhering to the needle after removing the crust, but it takes time to disinfect with this alcohol cotton, and the total crust removal time is long. became. Although the scab removal time was not affected, in Comparative Examples 2 and 3, there was a risk of skin damage due to the needle tip, so great care was required.

  In the examples, the peel condition was as good as 4, the total crust removal time and crust removal time were both short, visual confirmation was possible, and the peel operation could be performed with confidence.

  INDUSTRIAL APPLICABILITY The present invention is useful for easily removing the crust and removing the crust without damaging the skin.

DESCRIPTION OF SYMBOLS 1 Needle cap 2 Blood purification processing instrument 10 Needle 11 Crust removal part 11a Outer peripheral surface 11b Inner surface 11c Top side part 20 Tube 21 Connection part 22 Holding part 23 Clamp 24 Cap 30 Blood purification circuit A Needle insertion axis B Angle C Center Line D Crust X Needle insertion direction

Claims (19)

A needle cap into which a needle for puncturing the body is inserted,
At the tip, a crust remover is formed,
The crust removing portion has an arc-shaped outer circumferential surface that is curved around the needle insertion axis and an inner surface that is located inside the outer circumferential surface, and the width in the insertion axis direction of the needle by the outer circumferential surface and the inner surface. A needle cap with an acute angle apex.   2. The needle cap according to claim 1, wherein a protruding portion having a flat front surface is formed at the distal end portion so as to protrude forward from the top side portion. The projecting portion is formed from the base end of the tip portion toward the front side on the left and right center lines as viewed from the front of the tip portion,
The outer peripheral surface of the crust removing portion is formed in a direction away from the projecting portion along the circumferential direction of the tip portion from the projecting portion, and the apex portion on an end side in a direction away from the outer peripheral surface. The needle cap according to claim 2, wherein is formed.   The needle cap according to claim 3, wherein the crust removing portion is formed on both left and right sides of the protruding portion.   The crust removing part is formed on both sides of the left and right center lines viewed from the front of the tip part, and the apex parts on both sides are formed to be opposite to each other in the circumferential direction of the tip part. The needle cap according to claim 1, wherein   The needle cap according to claim 1, wherein the inner surface is convexly curved toward the outer peripheral surface. A needle cap into which a needle for puncturing the body is inserted,
At the tip, a crust remover is formed,
The crust removing portion has a planar outer surface along the needle insertion axis direction and an inner surface positioned inside the outer surface, and the acute angle having a width in the needle insertion axis direction by the outer surface and the inner surface. A needle cap in which the top side of is formed.   The needle cap according to claim 7, wherein the distal end portion is formed with a protruding portion that protrudes further forward than the apex portion and has a flat front surface. The projecting portion is formed from the base end of the tip portion toward the front side on the left and right center lines as viewed from the front of the tip portion,
The needle cap according to claim 8, wherein the outer surface of the crust removing portion is formed beside the protruding portion, and the apex portion is formed on an outer end of the outer surface far from the protruding portion. .   The needle cap according to claim 9, wherein the crust removing part is formed on both left and right sides of the protruding part.   The crust removing part is formed on both sides of the left and right center lines viewed from the front of the tip part, and the apex parts on both sides are formed to be opposite to each other on the left and right of the tip part. The needle cap according to claim 7.   The needle cap according to any one of claims 7 to 11, wherein the inner surface is convexly curved toward the outer surface.   The needle cap according to any one of claims 1 to 12, wherein the inner skin part is inclined in the insertion axis direction of the needle so that the crust removing part gradually becomes thinner toward the front surface.   The needle cap according to any one of claims 1 to 13, which is used for a needle that is punctured during blood purification treatment.   The needle cap according to any one of claims 1 to 14, which is used for a needle punctured at the time of drug solution administration or blood sampling.   The needle cap according to any one of claims 1 to 15, a needle inserted into the needle cap, a tube connected to the tip of the needle, and a rear end of the tube connected to another tube And a blood purification treatment instrument that has a connection part for forming a part of the blood purification circuit. A crust remover attached to the needle cap,
A crust remover for buttonhole puncture, which has one side surface parallel to the long axis direction and another side surface oblique, and a sharp tip formed by these two side surfaces.   The crust remover according to claim 17, wherein the crust remover is integral with a needle cap.   The crust remover according to claim 17 or 18, wherein the crust remover is fixed to a puncture needle holder aseptic bag.