JP6504446B2 - Puncture needle for subcutaneous tunnel - Google Patents

Description

  The present invention relates to a puncture needle for a subcutaneous tunnel.

  As a puncture needle (puncture needle for subcutaneous tunnels) for forming a subcutaneous tunnel which penetrates subcutaneous tissue and both ends open to skin, a puncture device for catheter indwelling shown in patent documents 1-3 is known, for example. The catheter placement puncture tool includes a needle body curved at a predetermined angle, an operation unit attached to the proximal end of the needle body, and a cannula into which the needle body is inserted.

  When forming a subcutaneous tunnel using this catheter placement puncture tool, the needle body is inserted into the cannula, and the operation portion is fitted into the proximal end portion of the cannula. Then, after the needle body is punctured into the body and passed through the subcutaneous part, the tip of the needle body is exposed outside the body. Along with this, the cannula penetrates the subcutaneous part, and both ends of the cannula appear on the skin. The needle body is withdrawn from the proximal end of the cannula, and the catheter is inserted from the distal end of the cannula and withdrawn from the proximal end. Then, the cannula is withdrawn from the subcutaneous part and the catheter proximally, and the catheter is placed in the subcutaneous part, and then the catheter is inserted into a blood vessel or the like.

Design registration No. 1185001 Design registration No. 1185002 Design registration No. 1185003

  In the subcutaneous tunnel detainer disclosed in Patent Document 1, the operation portion is fitted in the proximal end portion of the cannula. For this reason, the proximal end of the cannula has a large diameter so that the operation portion can be accommodated therein, and the diameter of the proximal end is the largest in the cannula. Thus, when the cannula is withdrawn subcutaneously and from the catheter, the cannula must be withdrawn from this proximal side. Thus, the restricted direction of withdrawal of the cannula can be inconvenient in the procedure.

  Then, an object of this invention is to provide the puncture needle for subcutaneous tunnels which can perform treatment simply.

  The puncture needle for subcutaneous tunnel according to the present invention is a puncture needle for forming a subcutaneous tunnel having both ends open to the skin, and is an inner needle that is curved and has a sharp needle tip at its tip, and the inner needle An inner needle hub provided on the proximal end side of the hollow needle, and a hollow outer needle through which the inner needle is inserted and the needle tip protrudes from the tip, and the proximal end portion of the outer needle The outer diameter is equal to or less than the maximum outer diameter of the outer needle.

  According to the present invention, when the curved inner needle pierces the skin of the needle for the hypodermic puncture needle fitted in the outer needle into the skin, penetrates the subcutaneous tissue, and protrudes from the skin outside the body, both ends contact the skin An open subcutaneous tunnel is formed. Then, after removing the inner needle from the outer needle, the catheter is inserted into the outer needle, and then the outer needle is taken out of the body. At this time, since the outer diameter of the proximal end portion of the outer needle is equal to or less than the maximum outer diameter of the outer needle, the outer needle can be pulled out from both the proximal end and the distal end. Thus, since the direction in which the outer needle is pulled out is not limited, the treatment can be performed easily.

  The present invention has the effect of being able to provide a puncture needle for a subcutaneous tunnel which has the above-described configuration and can be easily treated.

It is a perspective view which shows the puncture needle for subcutaneous tunnels which concerns on 1st Embodiment of this invention. It is a front view which shows the puncture needle for subcutaneous tunnels of FIG. It is the figure which looked at the puncture needle for subcutaneous tunnels of FIG. 2 from the front end side. It is a figure which shows the state which punctured the puncture needle for subcutaneous tunnels in the body. It is a figure which shows the state which detained the outer needle of the puncture needle for subcutaneous tunnels of FIG. FIG. 6 illustrates the catheter of FIG. It is a figure which shows the state which extracted the outer needle from the catheter of FIG. It is a perspective view which shows the puncture needle for subcutaneous tunnels which concerns on 2nd Embodiment of this invention.

  Hereinafter, a puncture needle for a subcutaneous tunnel according to an embodiment of the present invention will be described with reference to the drawings. In the following, the same or corresponding elements are denoted by the same reference numerals throughout all the drawings, and the redundant description thereof will be omitted. Further, the concept of the direction used in the following description is used for convenience of the description, and the direction of the configuration of the invention is not limited to that direction. Furthermore, the subcutaneous tunnel puncture needle described below is only one embodiment of the present invention. Accordingly, the present invention is not limited to the embodiments, and additions, deletions, and modifications are possible without departing from the scope of the invention.

First Embodiment
The hypodermic tunnel puncture needle 1 shown in FIGS. 1 to 3 is used to form a hypodermic tunnel which penetrates a hypodermis and whose both ends are open to the skin. In the following description, the distal end of the practitioner who punctures the patient with the hypodermic puncture needle 1 is a tip, and the proximal end of the practitioner is a proximal end. It is called.

  The hypodermic tunnel puncture needle 1 is composed of an inner needle 10, an inner needle hub 20 and an outer needle 30. The inner needle 10 is a hard needle for allowing the outer needle 30 to enter subcutaneous tissue under the skin, and is formed of, for example, a metal material or a hard synthetic resin. The inner needle 10 has a main body (inner needle main body) 11 and a needle tip 12, and the inner needle body 11 and the needle tip 12 are integrally formed.

  The inner needle main body 11 has a solid cylindrical shape or a hollow cylindrical shape, and the outer diameter thereof is constant or substantially constant in the longitudinal direction. The distal end of the inner needle body 11 is connected to the needle tip 12, and the proximal end is connected to the inner needle hub 20.

  The inner needle main body 11 is curved in a U-shape, and has a first straight portion 11a, a second straight portion 11b, and a curved portion 11c. The first straight portion 11 a is a portion on the proximal end side of the inner needle main body 11, and the tip thereof is connected to the proximal end of the bending portion 11 c, and the proximal end is connected to the tip of the inner needle hub 20. The central axis of the first straight portion 11 a coincides with the central axis of the inner needle hub 20, and the first straight portion 11 a protrudes linearly from the tip of the inner needle hub 20. The second straight portion 11b is a portion on the tip side of the inner needle main body 11, and the tip is connected to the needle tip 12, and the base end is connected to the tip of the bending portion 11c. The curved portion 11c is provided between the first straight portion 11a and the second straight portion 11b, and is curved smoothly.

  The inner needle main body 11 is curved at 90 degrees or more. That is, the bending portion 11c is curved such that an angle formed by the first straight portion 11a and the second straight portion 11b is, for example, 90 degrees or less. As a result, the needle tip 12 and the second straight portion 11 b extend perpendicularly to the first straight portion 11 a or extend in the direction closer to the inner needle hub 20 from the vertical line toward the respective tips.

  Furthermore, it is preferable that the inner needle main body 11 is curved at 180 degrees or less. Thereby, the needle tip 12 and the second straight portion 11b extend in parallel to the first straight portion 11a or extend in the direction away from the inner needle hub 20 side from the parallel line toward each tip.

  In the direction perpendicular to the central axis of the inner needle hub 20, the position of the needle tip 12 is located at or near the tip of the inner needle hub 20. Further, the length of the second straight portion 11 b is set according to the length of the subcutaneous tunnel 2, for example, equal to the length of the subcutaneous tunnel 2.

  The needle tip 12 has a sharp shape capable of piercing the skin and subcutaneous tissue. For example, the needle tip 12 is obliquely cut so that the tip end face faces the inner needle hub 20 or the first straight portion 11a. The needle tip 12 coincides with the central axis of the needle 12 and the central axis of the second straight portion 11 b, and linearly protrudes from the tip of the inner needle main body 11.

  The inner needle hub 20 is formed of, for example, a synthetic resin, and has a substantially cylindrical shape or a substantially cylindrical shape. The inner needle hub 20 is provided with a substantially rectangular grip portion 21 so that a practitioner such as a doctor or a nurse can easily grip. The shape and the material of the inner needle hub 20 are not particularly limited as long as the practitioner can hold by hand and has a strength capable of forming a subcutaneous tunnel.

  The outer needle 30 is a hollow cylindrical tube formed of a flexible synthetic resin. The distal end portion 30b of the outer needle 30 has a tapered shape that becomes thinner toward the distal end, and the portion other than the distal end portion 30b is constant. Therefore, the outer diameter of the outer needle 30 is such that the distal end portion 30 b is smaller than the maximum outer diameter of the outer needle 30 and the proximal end portion 30 a is the same diameter as the maximum outer diameter of the outer needle 30. Here, although the proximal end portion 30a has the same diameter as the maximum outer diameter of the outer needle 30, if the outer diameter of the proximal end portion 30a of the outer needle 30 is equal to or less than the maximum outer diameter of the outer needle 30 Good. For example, the outer diameter of the proximal end portion 30 a of the outer needle 30 may be less than the maximum outer diameter of the outer needle 30.

  The inner diameter of the distal end portion 30b of the outer needle 30 is smaller than that of the other portions, and the inner diameter of the outer needle 30 excluding the distal end portion 30b is constant. The inner diameter of the outer needle 30 is larger than the outer diameter of the inner needle body 11, and this difference is smaller at the tip end portion 30b of the outer needle 30 than at other portions.

  The length of the outer needle 30 is set shorter than the length of the inner needle 10. When the inner needle 10 is inserted into the outer needle 30, the proximal end of the outer needle 30 contacts the tip of the inner needle hub 20, and the tip 12 of the inner needle 10 protrudes from the tip of the outer needle 30.

  Next, with reference to FIGS. 4 to 7, a procedure for forming the subcutaneous tunnel 2 using the subcutaneous tunnel puncture needle 1 and passing the catheter 5 through the subcutaneous tunnel 2 will be described. In this operation method, the distal end of the catheter 5 is already inserted into a target portion (for example, the epidural space) in the patient's body for examination or treatment, and the proximal end of the catheter 5 It is a treatment method for passing through the subcutaneous tunnel 2. However, the treatment using the subcutaneous tunnel puncture needle 1 is not limited to this treatment method.

  As shown in FIG. 4, a perforation 6 is formed in the skin 3 by a catheter 5 already indwelled in the body. The practitioner holds and holds the grip portion 21 of the inner needle hub 20 in his hand. At this time, it is desirable to insert the needle tip 12 of the hypodermic puncture needle 1 into the perforation 6 in consideration of the burden on the patient and the convenience of treatment. Also, the needle tip 12 is placed along the catheter 5 so that the needle tip 12 does not damage the catheter 5. The position of the puncture of the needle tip 12 may be in the vicinity of the perforation 6.

  Then, the practitioner inserts the needle tip 12 obliquely downward into the subcutaneous tissue 4 and then turns the needle tip 12 obliquely upward and pulls it up toward the practitioner. As a result, the inner needle 10 and the outer needle 30 penetrate the hypodermic tissue 4 in a curvilinear manner, and the both end portions project from the skin 3 outside the body.

  The practitioner removes the inner needle 10 from the proximal end side from the inside of the outer needle 30, and places the outer needle 30 in the body as shown in FIG. The outer needle 30 forms a curved subcutaneous tunnel 2 in the subcutaneous tissue 4. Both ends of the subcutaneous tunnel 2 open on the skin 3, and the length between the two openings 2a and 2b of the subcutaneous tunnel 2 is, for example, several tens of mm. The one opening 2a of the both-ends opening 2a, 2b of the subcutaneous tunnel 2 is used as an insertion port of the catheter 5, and the other opening 2b is used as an outlet of the catheter 5. Here, the insertion port is an opening 2 a formed at or near the perforation 6 of the catheter 5.

  As shown in FIG. 6, the proximal end of the catheter 5 is inserted from the proximal end of the outer needle 30 and the insertion port 2 a of the subcutaneous tunnel 2, passed through the outer needle 30 and the subcutaneous tunnel 2, and the tip of the outer needle 30 and It pulls out from the outlet 2b of the subcutaneous tunnel 2. Thereby, the catheter 5 passes through the outer needle 30 and the subcutaneous tunnel 2, and the proximal end portion of the catheter 5 protrudes from the tip of the outer needle 30 and the outlet 2 b.

  Finally, as shown in FIG. 7, when the outer needle 30 is withdrawn from its tip side, the outer needle 30 is removed from the subcutaneous tunnel 2 and the catheter 5. As a result, the catheter 5 passes through the curved subcutaneous tunnel 2 and goes out of the body. Here, a protective tape (not shown) is applied to the skin 3 so as to cover the insertion port 2 a and the extraction port 2 b of the subcutaneous tunnel 2.

  According to the above configuration, since the outer diameter of the proximal end portion 30a of the outer needle 30 is formed equal to or less than the maximum outer diameter of the outer needle 30, a large diameter portion is provided on the proximal end portion 30a of the outer needle 30 Not. Also, the distal end portion 30b of the outer needle 30 is not usually provided with a large diameter portion so that the outer needle 30 can be easily inserted into the body. For this reason, since there is no large diameter part in the both-ends side part of outer needle 30, the direction which pulls out outer needle 30 is not restricted by the large diameter part, and treatment can be performed easily. In addition, in the case of forming a subcutaneous tunnel 2 for passing an implanted catheter 5, the operation can be performed safely.

  For example, the case of forming a subcutaneous tunnel 2 for passing an implanted catheter 5 as shown in FIGS. 4 to 7 will be described. Since it is necessary to insert the catheter 5 into the subcutaneous tunnel 2 from or near the perforation 6 of the catheter 5 in consideration of the burden on the patient, the treatment convenience, etc., the insertion port 2a of the subcutaneous tunnel 2 is perforated 6 or its vicinity It has to be formed. Moreover, since the tip of the catheter 5 is embedded in the body, after inserting the catheter 5 into the outer needle 30, it is necessary to withdraw the outer needle 30 from the proximal end side of the catheter 5 (outlet 2b of the subcutaneous tunnel 2). There is.

  Here, when the outer needle 30 provided with the large diameter portion is used, the direction in which the outer needle 30 is taken out from the catheter 5 is limited by the large diameter portion. Therefore, the needle 5 is punctured at a position away from the perforation 6 of the catheter 5, and the needle tip 12 is removed from the position of the perforation 6. Thereby, the insertion port 2 a can be provided in the bore 6, and the catheter 5 can be inserted from the bore 6 into the subcutaneous tunnel 2. Further, the large diameter portion of the outer needle 30 can be provided on the outlet 2 b side, and the outer needle 30 can be withdrawn from the outlet 2 b of the subcutaneous tunnel 2. However, since the position of the needle tip 12 in the body can not be visually confirmed, it is difficult to take the needle tip 12 out of the body at the position of the perforation 6 and the needle tip 12 may hit the catheter 5 and damage the catheter 5.

  On the other hand, in the hypodermic tunnel puncture needle 1, the large diameter portion is not provided on the proximal end portion 30 a of the outer needle 30. Thereby, since the direction in which the outer needle 30 is taken out from the catheter 5 is not limited, the outer needle 30 can be pulled out from the outlet 2 b of the subcutaneous tunnel 2 even if it punctures the perforation 6 of the catheter 5. Therefore, the needle tip 12 can be punctured and operated while confirming the position of the perforation 6 of the catheter 5 and the position of the catheter 5. Therefore, the insertion port can be easily formed by puncturing at or near the perforation 6 safely without damaging the catheter 5.

  Furthermore, when the outer diameter of the proximal end portion 30a of the outer needle 30 is less than the maximum outer diameter of the outer needle 30, the outer needle 30 can be more easily pulled out.

  In addition, since the inner needle main body 11 is curved, the curved subcutaneous tunnel 2 can be easily formed. The catheter 5 can be fixed more reliably because the catheter 5 is difficult to remove from the curved subcutaneous tunnel 2. Furthermore, when bleeding within the subcutaneous tunnel 2, blood is accumulated at the bottom of the curved subcutaneous tunnel 2, so that bleeding to the outside can be prevented. Moreover, since the outer needle 30 is hard to remove from the inner needle 10 by the inner needle main body 11 being curved, the operation is easy.

  Furthermore, the short hypodermic tunnel 2 can be easily formed by the inner needle body 11 being curved at 90 degrees or more. Therefore, the range of the subcutaneous tissue 4 damaged by the subcutaneous tunnel 2 can be narrowed, and the burden on the patient due to the formation of the subcutaneous tunnel 2 can be suppressed. In addition, since the length between the two end openings 2a and 2b of the subcutaneous tunnel 2 is short, one sheet of protective tape can cover both the both ends openings 2a and 2b, making the catheter 5 passing through the subcutaneous tunnel 2 simple and more It can be fixed securely.

  In addition, a second straight portion 11 b is provided at a tip end portion of the inner needle main body 11. As a result, the practitioner can easily adjust the advancing direction of the second straight portion 11 b and the needle tip 12 provided on the tip end side, so that the treatment can be performed easily.

  Furthermore, since the outer diameter of the distal end side portion 30b of the outer needle 30 is small, it is easy to puncture. Further, since the inner diameter of the distal end side portion 30b of the outer needle 30 is small, the distance between the outer needle 30 and the inner needle 10 is narrow, and the outer needle 30 does not easily come out of the inner core. Easy to handle.

Second Embodiment
In the puncture needle 1 for subcutaneous tunnel according to the second embodiment, the shape of the inner needle main body 13 is different from that of the inner needle main body 11 according to the first embodiment, but the other configuration is similar. As shown in FIG. 8, the inner needle main body 13 is formed in a straight line over the entire length without being curved. The inner needle body 13 has its proximal end connected to the tip of the inner needle hub 20 and its central axis coincides with the central axis of the inner needle hub 20 and extends straight from the tip of the inner needle hub 20. The inner needle body 13 has its tip connected to the proximal end of the needle tip 12, its central axis coincides with the central axis of the needle tip 12, and the needle tip 12 extends straight from the tip of the inner needle body 13 .

  The outer needle 30 whose outer diameter of the proximal end portion 30a is equal to or less than the maximum outer diameter of the outer needle 30 is fitted to the inner needle main body 13 for the operation. In this case, the practitioner pinches the skin 3 and a part of the subcutaneous tissue 4 with a finger and punctures the needle tip 12 in the pinched portion. Then, after the inner needle 10 and the outer needle 30 pass through the pinched portion, the inner needle 10 is removed from the outer needle 30 and the finger is released, and as shown in FIG. Buried in After passing the catheter 5 into the outer needle 30 as shown in FIG. 6, if the outer needle 30 is pulled out from the subcutaneous tunnel 2 as shown in FIG. 7, the catheter 5 will be embedded in the subcutaneous tunnel 2 .

  According to the above configuration, by using the outer needle 30 formed such that the outer diameter of the proximal end portion 30a is equal to or less than the maximum outer diameter of the outer needle 30, similarly to the puncture needle 1 for subcutaneous tunnel of the first embodiment, The procedure can be performed simply and safely. In addition, since the inner diameter of the distal end side portion 30b of the outer needle 30 is small, the puncture needle 1 for subcutaneous tunnel is easy to handle.

(Other embodiments)
In puncture needle 1 for subcutaneous tunnels of all the above-mentioned embodiments, the inside diameter and the outside diameter of tip part 30b of outer needle 30 were formed smaller than other parts. On the other hand, at least one of the inner diameter and the outer diameter of the distal end portion 30b may be the same as the other portion.

  Moreover, in the puncture needle 1 for subcutaneous tunnels of 1st Embodiment, although a part of inner needle main body 11 curved, inner needle main body 11 may be curved over the full length. Moreover, although the 1st linear part 11a and the 2nd linear part 11b were provided in the both ends of the curved part 11c in the inner needle main body 11, you may provide only any one of the 1st linear part 11a and the 2nd linear part 11b. . Thus, when the tip side portion 30b of the inner needle main body 11 is curved, the curved needle tip 12 can also be used.

1: puncture needle for subcutaneous tunnel 2: subcutaneous tunnel 2a: opening 2b: opening 3: skin 10: inner needle 11: inner needle body 11b: second straight portion 11c: curved portion 12: needle tip 13: inner needle body 20: Inner needle hub 30: Outer needle 30a: Base end side

Claims (3)

A puncture needle for forming a subcutaneous tunnel having both ends open to the skin,
An inner needle that is curved and has a sharp needle point at its tip,
An inner needle hub provided on the proximal end side of the inner needle;
The hollow outer needle through which the inner needle is inserted and the needle tip protrudes from the tip,
Ri maximum outer diameter or less under der the outer diameter of the outer needle of the proximal portion of the outer needle,
The puncture needle for subcutaneous tunnels , wherein the inner needle is curved by more than 90 degrees . The puncture needle for subcutaneous tunnel according to claim 1, wherein the inner needle has a curved portion and a straight portion provided on the distal side of the curved portion. The puncture needle for subcutaneous tunnel according to claim 1 or 2 , wherein the outer needle hub to which the outer needle is connected is not provided.

Images