Embedded body retention device

Abstract

The present invention relates to an implant placement instrument (10) and an implant placement method which make it possible to easily release fixation of a thread-like implant (40). The implant placement instrument (10) comprises: an introduction section (12) in which a needle tip (20) to be inserted into subcutaneous tissue (92) of a body is formed; a protection section (14) that is provided to the base end side of the introduction section (12) and that supports the thread-like implant (40); and a fixing section (16) that is provided between the introduction section (12) and the protection section (14) and that retains a tip (40a) of the implant (40). The fixing section (16) has a retention structure that draws out the tip (40a) of the implant (40) to the outside of the protection section (14) and retains the same.

Description

Technical Field

[0001] The present invention relates to an implant retainer for implanting a long implant into subcutaneous tissue. Tool Related.

Background Art

[0002] Conventionally, a technique for implanting a long implant subcutaneously has been performed, and various instruments for use in the technique have been proposed. For example, US Patent Application Publication No. 2018 / 0206963 discloses an instrument for implanting a long implant subcutaneously for cosmetic purposes.

[0003] The instrument of US Patent Application Publication No. 2018 / 0206963 places a filamentous implant on a long protective member and introduces the implant into subcutaneous tissue while supporting the implant with the protective member.

Summary of the Invention

[0004] In the instrument of US Patent Application Publication No. 2018 / 0206963, when inserting the implant, in order to prevent damage to the implant due to frictional resistance in subcutaneous tissue, the instrument is provided with a protective structure for protecting the implant, and the implant is covered with the protective structure. However, when a protective structure is provided, there is a problem that it becomes difficult to release the fixing of the implant to the protective member.

[0005] The present invention aims to provide an implant retainer that can easily release the fixation of a filamentous implant. Tool To provide.

[0006] One aspect of the present invention includes an introduction part formed with a needle tip to be inserted into subcutaneous tissue of a living body, a protection part provided on the proximal end side of the introduction part and supporting a filamentous implant, and provided between the introduction part and the protection part. A fixing part that holds the tip of the implant, and the fixing part has a holding structure that pulls out and holds the tip of the implant outside the protection part, in an implant retainer.

[0008] The implant retainer from the above perspective Tool Accordingly, the fixation of the filamentous implant to the holding structure can be easily released.

Brief Description of the Drawings

[0009]

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[0010] Hereinafter, preferred embodiments of the present invention will be given and described in detail with reference to the accompanying drawings.

[0011] As shown in Fig. 1, the implant placement device 10 according to the embodiment includes a tip-side introduction portion 12 formed to be long along the axis B, and a protection portion 14 provided on the proximal end side of the introduction portion 12. The introduction portion 12 and the protection portion 14 are integrally formed, and a through hole 28 extending in the direction of the axis B is formed inside from the needle tip 20 to the proximal end 32.

[0012] The introduction portion 12 is a portion that becomes the tip side when the implant placement device 10 is inserted into the subcutaneous tissue 92 (see Fig. 2A) of the living body, and includes a needle tip 20 that pierces the subcutaneous tissue 92 of the living body at the tip. The needle tip 20 has a bevel surface 22 (inclined surface) inclined with respect to the axis B. A through hole 28 is opened at the central portion of the bevel surface 22. In addition, a sharp blade tip 24 is formed at the tip portion of the bevel surface 22, and a blade base 26 is formed at the proximal end. When used in a site where it is not desired to damage blood vessels, muscle tissue, tendons, etc., the blade tip 24 may be formed in a rounded shape. The introduction portion 12 is formed in a cylindrical shape with a certain outer diameter dimension and extends from the needle tip 20 toward the proximal end side. The proximal end side of the introduction portion 12 is integrally connected to the protection portion 14.

[0013] The protection portion 14 is formed in a cylindrical shape with a certain outer diameter dimension toward the proximal end 32, and an accommodation portion 30 connected to the through hole 28 is provided inside thereof. The accommodation portion 30 is mostly covered by a cylindrical outer peripheral wall 34 and accommodates a filamentous implant 40 (see Fig. 2B) described later. In addition, a slit notch portion 18 formed by circumferentially notching a part of the outer peripheral wall 34 is formed on the outer peripheral portion of the protection portion 14. The accommodation portion 30 is open to the outer peripheral side through the slit notch portion 18. The filamentous implant 40 can be arranged in the accommodation portion 30 through the slit notch portion 18.

[0014] At the tip of the slit notch 18, a fixing portion 16 for fixing the embedding body 40 to the embedding body retaining device 10 is provided. The fixing portion 16 is formed of a slit that is substantially L-shaped in plan view and is connected to the tip of the slit notch 18. Specifically, the fixing portion 16 includes a first notch 36 that extends in the circumferential direction from the slit notch 18, and a second notch 38 that bends at a right angle from the tip of the first notch 36 and extends toward the base end side.

[0015] As the constituent materials of the introduction portion 12 and the protection portion 14 described above, for example, metals such as stainless steel, aluminum alloy, or titanium alloy, or hard resin materials can be used. Further, the diameter of the introduction portion 12 and the protection portion 14 can be, for example, about 2.4 mm, and the inner diameter can be about 1.8 mm. The widths of the slit notch 18 and the fixing portion 16 (dimensions in the direction perpendicular to the longitudinal direction) can be about 1.0 mm. The slit notch 18, the first notch 36, and the second notch 38 can be formed by performing cutting processing or laser processing on the hollow needle.

[0016] Next, a method for retaining the embedding body 40 using the above-described embedding body retaining device 10 will be described.

[0017] First, as shown in FIG. 2A, the embedding body retaining device 10 is punctured into the skin 90 of the living body. The needle tip 20 of the introduction portion 12 is punctured into the skin 90 of the living body, and the introduction portion 12 is advanced into the subcutaneous tissue 92. When the needle tip 20 is formed to be blunt, the skin 90 may be incised prior to puncturing the skin 90. Thereafter, the introduction portion 12 is advanced into the subcutaneous tissue 92.

[0018] Next, as shown in FIG. 2B, the advancement of the implant placement device 10 is stopped, and the filamentous implant 40 is attached to the protection part 14. Various materials can be used for the implant 40 according to the purpose. For example, when the implant 40 is used for the regeneration of damaged tissue, as the implant 40, collagen fibers obtained by squeezing a strip-shaped collagen fiber sheet so as to be thinner on the short side can be used. The implant 40 made of collagen fibers has high affinity with the cells of the living body, and a large number of cells gather in the porous part, so that the regeneration of the surrounding tissue can be promoted.

[0019] The fixation of such a filamentous implant 40 to the protection part 14 can be performed by the method shown in FIGS. 3A and 3B. First, as shown in FIG. 3A, hold one end and the other end of the implant 40 by hand, and overlap the implant 40 on the first notch 36 of the fixing part 16. Then, press the implant 40 toward the protection part 14. As a result, a part of the implant 40 enters the inside of the first notch 36.

[0020] Next, as shown in FIG. 3B, slide the implant 40 toward the proximal end side and hook the distal end side of the implant 40 on the second notch 38. Then, as shown in the figure, the implant 40 is inserted into the housing part 30 through the slit notch 18. Thereby, the fixation (attachment) of the implant 40 to the protection part 14 is completed. The fixing part 16 bends the implant 40 and pulls out the implant 40 to the side opposite to the housing part 30 side of the protection part 14, that is, to the outside of the protection part 14. When the part of the implant 40 protruding outward from the protection part 14 and the fixing part 16 passes through the subcutaneous tissue 92, it bends toward the proximal end side due to the frictional resistance and is continuously held by the fixing part 16.

[0021] Thereafter, as shown in FIG. 2C, the implant placement device 10 is advanced so as to penetrate the target site, and a part of the distal end side of the introduction part 12 and the protection part 14 is exposed from the skin 90. Along with this, the implant 40 is introduced into the subcutaneous tissue 92 while being protected by the protection part 14. Since the collagen fibers are kept in a state where no load due to frictional resistance acts when being introduced into the subcutaneous tissue 92, it is possible to prevent the internal porous structure from being destroyed, and the implant 40 is introduced into the subcutaneous tissue 92 while maintaining the tissue regeneration ability.

[0022] Thereafter, when the fixing part 16 of the protection part 14 is exposed, the advancement of the implant placement device 10 is stopped. Then, the distal end part 40a of the implant 40 is detached from the fixing part 16. The detachment of the distal end part 40a from the fixing part 16 can be performed by a method of moving the distal end part 40a disposed in the second notch part 38 to the slit notch part 18 side through the first notch part 36, or by a method of cutting off the distal end part 40a of the implant 40 of the part protruding outside the protection part 14 with scissors or the like.

[0023] Thereafter, the implant placement device 10 is completely withdrawn from the distal end side (introduction part 12 side). Then, due to the frictional resistance between the implant 40 of the part protruding from the proximal end 32 and the subcutaneous tissue 92, the implant 40 remains in the subcutaneous tissue 92, and only the protection part 14 is withdrawn. In this way, the implant 40 can be implanted into the subcutaneous tissue 92 without applying a large load to the implant 40.

[0024] The implant placement device 10 of the present embodiment has the following effects.

[0025] The implant placement device 10 of the present embodiment includes an introduction part 12 formed with a needle tip 20 inserted into the subcutaneous tissue 92 of a living body, a protection part 14 provided on the proximal end side of the introduction part 12 for protecting the filamentous implant 40, and a fixing part 16 provided between the introduction part 12 and the protection part 14 for holding the distal end part 40a of the implant 40. The fixing part 16 has a holding structure for bending the distal end part 40a of the implant 40 and pulling it out to the outside of the protection part 14 for holding.

[0026] By configuring it in this way, while the fixing part 16 passes through the subcutaneous tissue 92 of the living body, due to the frictional resistance between the implant 40 of the part protruding outside the protection part 14 and the subcutaneous tissue 92, the implant 40 is kept hooked on the fixing part 16, and the detachment of the implant 40 can be prevented. Further, after the fixing part 16 penetrates the skin 90 of the living body, the protruding part of the implant 40 can be moved from the fixing part 16 to the side of the slit notch part 18 or cut, so that the implant 40 can be easily removed from the fixing part 16.

[0027] In the above-described implant retaining device 10, the fixing part 16 is formed of a slit having a width through which the implant 40 passes. Thereby, the attachment and detachment of the implant 40 to the fixing part 16 become easier.

[0028] In the above-described implant retaining device 10, the slit of the fixing part 16 has a first notch part 36 extending in the width direction orthogonal to the longitudinal direction of the protection part 14, and a second notch part 38 that bends and extends from the tip of the first notch part 36 toward the longitudinal direction of the protection part 14. By configuring the fixing part 16 as the substantially L-shaped slit as described above, the attachment and detachment of the filamentous implant 40 to the fixing part 16 can be easily performed.

[0029] In the above-described implant retaining device 10, the protection part 14 includes an outer peripheral wall 34 that covers the periphery of the implant 40, and a slit notch part 18 that is formed by notching a part of the circumferential direction of the outer peripheral wall 34 and extends in the longitudinal direction. By configuring it in this way, the filamentous implant 40 can be protected, and the implant 40 can be easily introduced into the accommodating part 30 inside the outer peripheral wall 34 through the slit notch part 18.

[0030] Hereinafter, a configuration example of each part of the implant retaining device 10 of the present embodiment and various modifications thereof will be described.

[0031] With reference to FIGS. 4A to 4D, an arrangement example of the slit notch part 18 will be described.

[0032] As shown in Fig. 4A, among the circumferential directions of the implant placement device 10, the cutting-edge direction A1 indicates the direction (circumferential position) in which the cutting edge 26 is formed, and the tip direction A2 indicates the direction (circumferential position) in which the tip 24 is formed. The introduction part 12 places the tip 24 of the bevel surface 22 on the side of the skin 90 and is punctured from the tip 24 into the skin 90, and is then pushed forward into the subcutaneous tissue 92 as it is. Therefore, in the protection part 14 of the implant placement device 10, the tip direction A2 becomes the direction facing the skin 90, and the cutting-edge direction A1 becomes the direction facing away from the skin 90.

[0033] (Modification Example 1) In the configuration example (Modification Example 1) shown in Fig. 4B, a slit notch 18 is formed in the cutting-edge direction A1 of the implant placement device 10. The slit notch 18 is formed in the direction that coincides with the cutting-edge direction A1. By configuring it in this way, when the implant placement device 10 is punctured into the subcutaneous tissue 92, the slit notch 18 of the protection part 14 faces the user side. Therefore, it becomes easier for the user to attach the implant 40 to the protection part 14 and insert the implant 40 into the accommodation part 30. Also, the removal of the implant 40 after passing through the implant placement device 10 can be easily performed.

[0034] (Modification Example 2) In the configuration example (Modification Example 2) shown in Fig. 4C, a slit notch 18 is formed at a position shifted 90° in the circumferential direction from the tip direction A2 of the implant placement device 10. Also in this configuration example, when the implant placement device 10 is punctured into the subcutaneous tissue 92, the slit notch 18 appears at a position operable for the user. Therefore, the user can easily perform the operation of attaching the implant 40 to the protection part 14. Also, the removal operation of the implant 40 from the implant placement device 10 can be easily performed.

[0035] (Modification Example 3) In the configuration example (Modification 3) shown in FIG. 4D, a slit notch 18 is formed in the cutting edge direction A2 of the implant placement instrument 10. In this configuration example, when the implant placement instrument 10 is punctured into the subcutaneous tissue 92, the slit notch 18 faces the skin 90 side. Therefore, after puncturing the implant placement instrument 10, it becomes difficult to attach the implant 40 by the method described with reference to FIG. 2B. In this configuration example, before puncturing the implant placement instrument 10 into the skin 90, the implant 40 is attached to the protection part 14 in advance. Thereafter, by puncturing the implant placement instrument 10 into the skin 90 and the subcutaneous tissue 92, the implant 40 can be placed.

[0036] Next, the configuration of the fixing part 16 will be described with reference to FIGS. 5A to 5D. As shown in FIG. 5A, the fixing part 16 has a first notch 36 and a second notch 38. Here, the circumferential position (orientation) of the second notch 38 will be referred to as the position of the fixing part 16.

[0037] (Modification 4) In the configuration example (Modification 4) shown in FIG. 5B, a slit notch 18 is formed at a position 90° different from the cutting edge direction A2. The fixing part 16 is formed at the position in the cutting edge base direction A1 in communication with this slit notch 18. In Modification 4, the fixing part 16 and the slit notch 18 are separated in the circumferential direction by 90° or more with respect to the cutting edge direction A2. Thereby, even when the implant placement instrument 10 is in a state of being punctured into the skin 90 and the subcutaneous tissue 92, the implant 40 can be easily attached to the fixing part 16.

[0038] (Modification 5) In the configuration example (Modification 5) shown in FIG. 5C, a slit notch 18 is formed in the cutting edge base direction A1, and the fixing part 16 is arranged in a direction separated by 90° or more from the cutting edge direction A2. Also in this configuration example, when the implant placement instrument 10 is punctured, since the slit notch 18 and the fixing part 16 are arranged in a place easily accessible to the user, the user can easily attach the implant 40 to the protection part 14.

[0039] (Modification 6) In the configuration example (Modification 6) shown in FIG. 5D, the fixing portion 16 and the slit notch portion 18 are formed at positions within a range of 90° in the circumferential direction with respect to the cutting edge direction A2. In this configuration example, when the implant placement device 10 is punctured, since a part of the slit notch portion 18 and the fixing portion 16 are arranged in a portion close to the skin 90, it becomes difficult to attach the implant 40 in the punctured state. In this configuration example, before puncturing the skin 90 with the implant placement device 10, the implant 40 can be placed by attaching the implant 40 to the protection portion 14.

[0040] (Modification 7) Next, with reference to FIGS. 6A and 6B, the implant placement device 10E according to Modification 7 will be described. In each component configuration of this modification, the same components as those of the implant placement device 10 in FIG. 1 are denoted by the same reference numerals, and detailed descriptions thereof are omitted. The implant placement device 10E according to this modification includes an introduction portion 12E and a protection portion 14E that are curved in an arc shape in the longitudinal direction. The introduction portion 12E and the protection portion 14E form a continuously connected arc-shaped curved shape.

[0041] As shown in FIG. 6B, when the needle tip 20 of the implant placement device 10E punctures the skin 90 of the living body, it advances along the arc-shaped curved shape so as to penetrate the skin 90 and the subcutaneous tissue 92. Thereby, the user can place the implant 40 in the subcutaneous tissue 92 without applying a large load to the introduction portion 12E.

[0042] (Modification 8) As shown in FIG. 7, in the implant placement device 10F of this modification, the protection portion 14F is formed in a U-shaped cross section. The slit notch portion 18F is formed with the same width as the inner diameter of the protection portion 14F. Since the slit notch portion 18F of this modification is formed larger than the slit notch portion 18 of the implant placement device 10 in FIG. 1, the operation of inserting the implant 40 into the accommodation portion 30 becomes easier.

[0043] (Modification 9) As shown in FIG. 8A, the implant body retaining device 10G of this modification includes an introduction portion 12G and a protection portion 14G formed in a flat plate shape. The introduction portion 12G is formed in a long flat plate shape. A sharp needle tip 22G is formed on the tip side of the introduction portion 12G. A protection portion 14G for protecting the thread-like implant body 40 is formed on the base end side of the introduction portion 12G. The protection portion 14G is formed in a long flat plate shape having the same width and thickness as the introduction portion 12G. Further, a fixing portion 16G for fixing the implant body 40 to the protection portion 14G is formed on the tip side of the protection portion 14G.

[0044] The fixing portion 16G includes a first notch portion 36G notched from the side portion of the boundary portion between the protection portion 14G and the introduction portion 12G toward the center in the width direction, and a second notch portion 38G bent vertically from the end portion of the first notch portion 36G and extending toward the base end side in the longitudinal direction of the protection portion 14G.

[0045] As shown in FIG. 8B, the implant body 40 is disposed along one surface of the protection portion 14G of the implant body retaining device 10G. That is, a housing portion 30 that houses the implant body 40 is formed in a portion adjacent to one surface of the protection portion 14G. Further, the tip portion of the implant body 40 is fixed to the fixing portion 16G. The implant body 40 is pulled out to the opposite surface through the second notch portion 38G (see FIG. 8A) of the fixing portion 16G and folded back toward the base end side, thereby being fixed to the fixing portion 16G.

[0046] Also with the implant body retaining device 10G according to this modification, the attachment and detachment of the implant body 40 to and from the protection portion 14G can be easily performed.

[0047] (Modification 10) As shown in FIG. 9A, the implant body retaining device 10H according to this modification is different from the implant body retaining device 10 in FIG. 1 in that a flying-out prevention portion 42 for preventing the implant body 40 from falling off is provided in the protection portion 14H. Since the structures of the introduction portion 12 and the fixing portion 16 in the implant body retaining device 10H are the same as those of the implant body retaining device 10 in FIG. 1, the illustration in FIG. 9A is omitted.

[0048] The protective part 14H is formed in a cylindrical shape, and a slit notch part 18H that is formed by notching a part of the circumferential direction on its outer peripheral wall 34 and extends in the longitudinal direction is formed. The circumferential width of the slit notch part 18H is dimensioned to be about the same as or larger than the diameter of the embedded body 40. Further, a plurality of anti-flying-out parts 42 are provided in the slit notch part 18 at intervals in the longitudinal direction.

[0049] As shown in FIG. 9B, the anti-flying-out part 42 is formed to project in the width direction of the slit notch part 18H, and by making the width of the slit notch part 18H in that part narrower, the embedded body 40 accommodated in the accommodation part 30 is prevented from falling out.

[0050] As shown in FIG. 9C, since the width of the slit notch part 18H in the part between the anti-flying-out parts 42 is dimensioned to be about the same as or larger than the diameter of the embedded body 40, the embedded body 40 can be easily inserted into the accommodation part 30. As described above, according to the embedded body retaining device 10H of this modification example, the embedded body 40 can be prevented from falling out of the protective part 14H.

[0051] (Modification Example 11) As shown in FIG. 10, the embedded body retaining device 10I according to this modification example is different from the embedded body retaining device 10 of FIG. 1 in the introduction part 12I. Note that a protective part 14 similar to that shown in FIG. 1 is provided on the proximal end side of the introduction part 12I. A needle tip 20I having an inclined bevel surface 22I is formed at the tip of the introduction part 12I.

[0052] A through hole 28 does not open in the bevel surface 22I of the needle tip 20I, and the bevel surface 22I is formed as a substantially flat plane. The introduction part 12I can be configured as, for example, a solid needle. Note that the introduction part 12I may have a through hole 28, and in this case, at least the tip part of the through hole 28 may be filled with resin or the like to form a flat bevel surface 22I.

[0053] According to this modification example, since the through hole 28 is not formed in the introduction part 12I, when puncturing the skin 90 and the subcutaneous tissue 92, it is possible to prevent a part of the subcutaneous tissue 92 from entering the through hole 28 to form a core ring. In addition, the rigidity of the introduction part 12I is increased, and the operation of penetrating the subcutaneous tissue 92 becomes easier.

[0054] (Modification Example 12) As shown in FIG. 11A, in the implant retention device 10J according to this modification example, the needle tip 20J at the tip of the introduction part 12J is formed by two bevel surfaces 22J. As shown in FIG. 11B, one bevel surface 22J and the other bevel surface 22J are arranged opposite to each other, and by intersecting near the central axis, a wedge-shaped needle tip 20J is formed. Note that the introduction part 12J may be a solid needle without a through hole 28.

[0055] According to this modification example, since the needle tip 20J is formed by two bevel surfaces 22J, the straightness is increased, and thus the operation of the introduction part 12J becomes easier.

[0056] (Modification Example 13) As shown in FIG. 12A, the implant retention device 10K according to this modification example includes a long and thin plate-shaped introduction part 12G and a protection part 14G, and a needle tip 22G is formed at the tip of the introduction part 12G. A fixing part 16G is provided at the tip of the protection part 14G. The configurations of the introduction part 12G, the protection part 14G, and the fixing part 16G are the same as those of the introduction part 12G, the protection part 14G, and the fixing part 16G described with reference to FIGS. 8A and 8B. In the implant retention device 10K of this modification example, further, a fixing part 16K is provided near the base end of the protection part 14G.

[0057] The fixing part 16K includes a first notch part 36K extending from the side part of the protection part 14G toward the vicinity of the center in the width direction, and a second notch part 38K bent at a right angle from the end of the first notch part 36K and extending toward the tip side of the protection part 14G. According to the implant retaining device 10K according to this modification example, the tip and the base end of the implant 40 can be fixed by the fixing parts 16G and 16K. Thereby, the implant 40 can be more reliably fixed to the protection part 14G. Note that the fixing parts 16G and 16K are not limited to two, and a plurality of them may be provided.

[0058] (Modification Example 14) As shown in FIG. 12B, in the implant retaining device 10L according to Modification Example 14, a fixing part 16 is provided on the tip side of the protection part 14L, and a fixing part 16L is provided near the base end of the protection part 14L.

[0059] The fixing part 16L is formed in an L shape including a first notch part 36L extending in the circumferential direction from the slit notch part 18 and a second notch part 38L bent perpendicular to the first notch part 36L and extending toward the tip side.

[0060] The implant retaining device 10L according to this modification example can fix the tip and the base end of the implant 40 with the fixing parts 16 and 16L, and can more reliably fix the implant 40 to the protection part 14L.

[0061] (Modification Example 15) As shown in FIG. 13A, the implant retaining device 10M according to this modification example includes an introduction part 12I made of a solid needle and a protection part 14M provided on the base end side of the introduction part 12I. Since the introduction part 12I is the same as the introduction part 12I described with reference to FIG. 10, the description thereof is omitted.

[0062] The protective part 14M is provided with a slit notch part 18M formed in a groove shape. The slit notch part 18M can be formed by cutting, such as milling, and has a rectangular cross-section. A housing part 30M is formed as a space for housing the embedding body 40 inside the slit notch part 18M. At the tip part of the slit notch part 18M, a fixing part 16M is formed adjacent to the width direction of the slit notch part 18M. The fixing part 16M of this modification includes a through part 44 provided adjacent to one side wall in the width direction of the slit notch part 18M. The through part 44 is a groove-shaped recess formed by performing cutting on the side part of the slit notch part 18M, and a narrow part 46 is provided at the boundary part with the slit notch part 18M. The width of the narrow part 46 is formed narrower than the width of the slit notch part 18M.

[0063] As shown in FIG. 13B, for the embedding body placement device 10M of this modification, a thread-like embedding body 40 formed with knots 48a and 48b can be used. It is desirable to form the knots 48a and 48b to have a width equal to or larger than that of the narrow part 46. When the knots 48a and 48b of the embedding body 40 are arranged in the vicinity of the narrow part 46 in this way, the displacement of the embedding body 40 can be prevented because the knots 48a and 48b are caught by the fixing part 16M. Thereby, the embedding body 40 can be fixed to the embedding body placement device 10M.

[0064] The attachment of the embedding body 40 to the protective part 14M can be easily performed by fitting the embedding body 40 into the slit notch part 18M side using tweezers or the like. Also, the detachment of the embedding body 40 from the protective part 14M can be easily carried out by pulling out the tip part 40a of the embedding body 40 from the through part 44 and removing the knots 48a and 48b from the fixing part 16M.

[0065] (Modification 16) As shown in Fig. 14A, the implant retaining device 10N according to this modification has a cylindrical protection part 14N, and a slit notch part 18 is formed by cutting out a part of the outer peripheral wall 34 thereof. An opening 50 is provided at the tip of the slit notch part 18 and is formed so as to widen the slit notch part 18 in the circumferential direction. An L-shaped hook piece 53 protruding toward the slit notch part 18 side is provided in the opening 50 to constitute the fixing part 16N. The hook piece 53 is integrally formed with the outer peripheral wall 34 of the protection part 14N, and includes an extension part 54 extending from the outer peripheral wall 34 and a bent part 52 extending by bending from the end of the extension part 54 toward the tip side. As shown in Fig. 14B, the hook piece 53 has the base end part of the extension part 54 bent toward the inside of the protection part 14N.

[0066] The implant retaining device 10N according to this modification has the same effect as the implant retaining device 10 in Fig. 1. Further, since the hook piece 53 is bent inside the protection part 14N, it is possible to prevent the hook piece 53 from being caught by the subcutaneous tissue 92 in the subcutaneous tissue 92 of the living body.

[0067] (Modification 17) As shown in Fig. 15A, the implant retaining device 10P according to this modification includes an introduction part 12I made of a solid needle and a protection part 14P provided on the base end side thereof. The introduction part 12I is the same as the introduction part 12I in Fig. 10. The protection part 14P includes a slit notch part 18M formed in a groove shape by cutting, and has a housing part 30M with a rectangular cross section. A fixing part 16P is formed at the tip of the slit notch part 18M.

[0068] The fixing part 16P includes a first opening groove 56 and a second opening groove 58 formed by cutting out one side wall of the slit notch part 18M. The first opening groove 56 is provided at the tip of the slit notch part 18M. The second opening groove 58 is formed at a distance from the first opening groove 56 toward the base end side. A side wall 57 is formed between the first opening groove 56 and the second opening groove 58.

[0069] As shown in Fig. 15B, in the implant body retaining device 10P of this modified example, the implant body 40 is fixed by winding the tip of the implant body 40 around the side wall 57 through the first opening groove 56 and the second opening groove 58. Also, the removal of the implant body 40 can be performed by removing the portion wound around the side wall 57 with tweezers or the like.

[0070] Note that, for the implant body retaining device 10P of this modified example, an implant body 40 having a ring formed at the tip for hooking on the side wall 57 may be used. In this case, the attachment work to the protection part 14P can be performed even more easily.

[0071] (Modified Example 18) As shown in Fig. 16A, the implant body retaining device 10Q according to this modified example is different from the implant body retaining device 10P shown in Fig. 15A in the structure of the fixing part 16Q. The fixing part 16Q includes an opening groove 60 formed by cutting out one of the slit notches 18M formed in a groove shape. The opening groove 60 is formed substantially flush with the bottom surface of the slit notch 18M. A locking piece 62 is joined to the bottom surface of the communicating portion of the opening groove 60 and the slit notch 18M.

[0072] The locking piece 62 is a rectangular plate-like member, and a base portion 62b is joined to the bottom surfaces of the opening groove 60 and the slit notch 18M. The locking piece 62 has a locking portion 62a that extends by bending from the base portion 62b. The tip of the locking portion 62a is spaced apart from the bottom surfaces of the opening groove 60 and the slit notch 18M.

[0073] In the implant body retaining device 10Q according to this modified example, the tip of the implant body 40 is sandwiched between the locking portion 62a of the locking piece 62, so that the implant body 40 can be fixed to the protection part 14Q. The implant body retaining device 10Q according to this modified example has the same effect as the implant body retaining device 10 shown in Fig. 1.

[0074] (Modified Example 19) As shown in FIG. 16B, the implant retaining device 10R according to this modified example includes an introduction portion 12 formed of a hollow needle and a protection portion 14. A through hole 28 and a housing portion 30R are formed inside the introduction portion 12. Further, an opening 64 is formed at the tip of the protection portion 14, which penetrates the outer peripheral wall 34. The opening 64 constitutes a fixing portion 16R for pulling out the tip portion 40a of the implant 40 to the outside of the housing portion 30R and detachably fixing the implant 40 to the protection portion 14.

[0075] The implant retaining device 10R is used by housing the implant 40 in the housing portion 30R and puncturing it into the subcutaneous tissue 92 with the tip portion 40a of the implant 40 pulled out from the opening 64. With the introduction portion 12 and the opening 64 penetrating the subcutaneous tissue 92 and protruding to the outside of the skin 90, the fixing state of the implant 40 to the protection portion 14 can be released by cutting the implant 40 at the portion protruding from the opening 64. Thus, according to this modified example, the release of the implant 40 can be easily performed.

[0076] (Modified Example 20) As shown in FIG. 17A, the implant retaining device 10S includes an introduction portion 12 formed of a hollow needle and a protection portion 14S provided on the proximal end side of the introduction portion 12. The protection portion 14S includes a slit notch portion 18M formed by cutting out a part of the outer peripheral wall 34. The slit notch portion 18M is formed to have a width larger than the outer diameter of the implant 40, and the implant 40 is disposed therein. In this modified example, the tip side of the introduction portion 12 is formed in a hollow cylindrical shape with a through hole 28 formed inside, and the through hole 28 is used as a fixing portion 16S for fixing the implant 40 to the protection portion 14S. The implant 40 is held by the implant retaining device 10S in a state of being fitted in the through hole 28 of the introduction portion 12. That is, the through hole 28 constitutes a holding structure of the fixing portion 16S that pulls out and holds the tip portion 40a of the implant 40 to the tip side, which is the outside in the axial direction of the protection portion 14S.

[0077] As shown in FIG. 17B, the implant retaining device 10S is provided as a product with the implant 40 accommodated in the accommodating portion 30M. By inserting the tip portion 40a of the implant 40 into the through-hole 28 of the introducing portion 12, the implant 40 is fixed to the protecting portion 14S. After penetrating the skin 90 and the subcutaneous tissue 92, the implant retaining device 10S can release the fixed state of the implant 40 with respect to the protecting portion 14S by pulling out the implant 40 inserted into the through-hole 28 with a needle or the like. Thus, also in the implant retaining device 10S of this modification example, the fixed state of the implant 40 can be easily released.

[0078] (Modification Example 21) As shown in FIG. 18A, in the implant retaining device 10T of this modification example, the outer diameter dimension of the introducing portion 12I is formed larger than the outer diameter dimension of the protecting portion 14. The introducing portion 12I and the protecting portion 14 having different outer diameter dimensions can be manufactured by methods such as swaging or welding the separately formed introducing portion 12I and protecting portion 14.

[0079] In order to penetrate the skin 90 and the subcutaneous tissue 92 with the introducing portion 12I, first, an operation of puncturing obliquely downward and then advancing the introducing portion 12I obliquely upward is required. According to the implant retaining device 10T of this modification example, by thickening the introducing portion 12I, the rigidity is increased, and the operation of penetrating the skin 90 and the subcutaneous tissue 92 becomes easier. Also, the frictional resistance between the protecting portion 14 on the proximal end side and the subcutaneous tissue 92 can be reduced.

[0080] (Modification Example 22) As shown in FIG. 18B, in the implant retaining device 10U of this modification example, the outer diameter dimension of the protecting portion 14 is larger than the outer diameter dimension of the introducing portion 12I. According to the implant retaining device 10U, the strength of the protecting portion 14 and the fixing portion 16 can be improved.

[0081] (Modification Example 23) This modified example is a modified method for fixing the implant 40 to the implant retaining device 10S shown in FIGS. 17A and 17B. In the example shown in FIG. 17B, only the implant 40 was inserted into the through-hole 28 of the introduction part 12. In contrast, in this modified example, a fitting member that can be inserted into the through-hole 28 is inserted into the through-hole 28 together with the implant 40. In the modified examples of FIGS. 17A and 17B, the implant 40 is flexible and easily deformable, so the fitting force against the through-hole 28 is weak. On the other hand, in this modified example, a fitting member with higher strength and less deformability is inserted into the through-hole 28 together with the implant 40. As a result, the implant 40 is sandwiched and held in the gap between the fitting member and the through-hole 28, so that the implant 40 can be more firmly fixed to the through-hole 28.

[0082] In the above, although the preferred embodiments of the present invention have been described with examples, it goes without saying that the present invention is not limited to the above embodiments, and various modifications are possible without departing from the spirit of the present invention.

Claims

1. An introduction part formed with a needle tip to be inserted into the subcutaneous tissue of a living body, a protection part provided on the proximal end side of the introduction part to protect a filamentous implant, and a fixing part provided on the distal end side of the protection part to hold the distal end part of the implant, comprising: The protection part is an outer peripheral wall covering the periphery of the implant, and a slit notch part formed by notching a part of the circumferential direction of the outer peripheral wall and extending in the longitudinal direction of the protection part, The fixing part is formed of a slit substantially L-shaped in plan view, a first notch part extending in the width direction orthogonal to the longitudinal direction of the protection part from the tip of the slit notch part, and a second notch part extending by bending from the tip of the first notch part toward the proximal end direction of the protection part, The first notch part and the second notch part extend with the same width as the width of the slit notch part, an implant retention device.

2. The implant retention device according to claim 1, wherein the fixing part is formed of a slit formed with a width through which the implant passes, an implant retention device.

3. The implant retention device according to claim 1 or 2, wherein a flying-out prevention part with a narrower circumferential width is provided in the slit notch part, an implant retention device.

4. The implant retention device according to any one of claims 1 to 3, wherein the needle tip of the introduction part has a bevel surface, and the circumferential position of the slit notch part is formed at a position deviated by 90° or more from the circumferential position of the tip of the bevel surface, an implant retention device.

5. The implant retention device according to any one of claims 1 to 4, wherein the introduction part and the protection part form a curved shape in a continuously connected arc shape, an implant retention device.

6. The implant retention device according to any one of claims 1 to 4, wherein the protection part is formed in a U-shaped cross section, and the slit notch part is formed with the same width as the inner diameter of the protection part, an implant retention device.

7. The implant retention device according to any one of claims 1 to 3, wherein the introduction part is a solid needle, the needle tip has a bevel surface inclined with respect to the introduction part, and the bevel surface is formed by a flat plane without an opening formed therein, an implant retention device.

8. The implant retention device according to any one of claims 1 to 3, wherein the needle tip is formed by two bevel surfaces, one of the bevel surfaces and the other bevel surface are arranged opposite to each other, and are formed in a wedge shape by intersecting near the central axis, an implant retention device.

9. An implant retaining device according to any one of claims 1 to 8, further comprising a second fixing portion formed near the base end of the protection portion, wherein the second fixing portion An implant retaining device comprising a third notch portion extending in the circumferential direction from the slit notch portion, and a fourth notch portion vertically bent from an end portion of the third notch portion and extending toward the tip side.

10. An implant retaining device according to any one of claims 1 to 9, further comprising an implant having a tip held by the fixing portion and housed in the protection portion.

11. An implant retaining device according to claim 10, wherein the implant is detachably held by the fixing portion.

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