CN217987674U - Subcutaneous tunnel needle assembly - Google Patents

Abstract

The utility model discloses a subcutaneous tunnel needle assembly, which comprises a needle body, an adjusting sleeve and a retraction and expansion connecting assembly; the needle body is arranged in the adjusting sleeve in a penetrating way, the relative positions of the needle body and the adjusting sleeve in the front-back direction are adjustable, the back end of the needle body is provided with a supporting block, and the adjusting sleeve is arranged on the front side of the supporting block; the contraction and expansion connecting assembly is arranged on the rear side of the adjusting sleeve and comprises at least two contraction and expansion strips, the front sides of the contraction and expansion strips are movably connected to the adjusting sleeve, and the contraction and expansion strips can be far away from or close to the axis of the needle body; the supporting block is provided with a first outward-expanding part, and the contraction-expansion strip is provided with a second outward-expanding part. The retraction and expansion connecting assembly stretches into the catheters to be connected, the needle body and the adjusting sleeve are adjusted to be arranged at the relative positions in the front-back direction, the retraction and expansion connecting assembly is expanded outwards to tightly support the inner wall of the catheter, the retraction and expansion connecting assembly is suitable for catheters with different tube diameters, and meanwhile, a plurality of retraction and expansion strips can also be suitable for cross section shapes more than two, so that one subcutaneous tunnel needle assembly can be suitable for various catheters, and the subcutaneous tunnel needle assembly is more convenient and flexible to use.

Description

Subcutaneous tunnel needle assembly

Technical Field

The utility model relates to the technical field of medical supplies, in particular to subcutaneous tunnel needle subassembly.

Background

In the hemodialysis treatment process, a subcutaneous tunnel is often required to be established, and the establishment of the subcutaneous tunnel is generally realized by connecting a subcutaneous tunnel needle with a catheter, puncturing the skin of a patient by using the subcutaneous tunnel needle, and guiding the catheter to the position below the surface of the skin of the patient. The catheters used for establishing the subcutaneous tunnel have various types with different pipe diameters or different section shapes, and medical staff can select the catheter with the proper pipe diameter or section shape to establish the subcutaneous tunnel according to actual requirements. However, the existing subcutaneous tunnel needle can only be connected with a catheter with one pipe diameter or section shape, and when catheters with different pipe diameters or section shapes are used, different types of subcutaneous tunnel needles are needed, so that more types of subcutaneous tunnel needles need to be prepared, and the subcutaneous tunnel needles are not convenient and flexible enough in use.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims at providing a subcutaneous tunnel needle subassembly aims at solving a subcutaneous tunnel needle among the prior art and can only adapt to and connect a pipe, the not convenient nimble technical problem of inadequately during the use.

In order to achieve the purpose, the utility model provides a subcutaneous tunnel needle assembly, which comprises a needle body, an adjusting sleeve and a contraction and expansion connecting component;

the axial direction of the needle body is taken as the front-back direction, the needle body penetrates through the adjusting sleeve, the needle body is adjustably connected with the adjusting sleeve, the relative positions of the needle body and the adjusting sleeve in the front-back direction are adjustable, the back end of the needle body is provided with a support block, and the adjusting sleeve is arranged on the front side of the support block;

the contraction and expansion connecting assembly is arranged on the rear side of the adjusting sleeve and comprises at least two contraction and expansion strips, the contraction and expansion strips extend in the front-rear direction, all the contraction and expansion strips are arranged around the periphery of the supporting block, the front sides of the contraction and expansion strips are movably connected to the adjusting sleeve, and the contraction and expansion strips can be far away from or close to the axis of the needle body;

be equipped with the first portion that expands outward on the kicking block, receive expand be equipped with on the strip with the first portion that expands is expanded outward to the second that sets up of portion matching, the first portion that expands outward with the second expands outward the portion and is used for promoting receive expand the strip and keep away from the axis of needle body.

The utility model has the advantages that: this subcutaneous tunnel needle subassembly is when connecting the pipe, receive to expand in the coupling assembling stretches into the pipe that needs to connect, adjusts the needle body and adjusts the relative position of cover on the fore-and-aft direction, expands under the cooperation between the portion outside first and the second expands for receive to expand the axis that the needle body was kept away from to the strip, receive to expand the coupling assembling and expand the inner wall of pipe outward and prop tightly, realize being connected between needle body and the pipe. According to the technical scheme, the outward-expanding contraction and expansion strips are arranged, so that the device is suitable for catheters with different pipe diameters, and meanwhile, a plurality of contraction and expansion strips can also be suitable for more than two cross-sectional shapes, so that one subcutaneous tunnel needle assembly can be suitable for various catheters, and the device is more convenient and flexible to use.

Preferably, the hole of adjusting collar is equipped with the internal thread, be equipped with on the needle body with the external screw thread that the internal thread matches the setting, the internal thread with external screw thread threaded connection, the needle body with the adjusting collar passes through the internal thread with external screw thread adjustable connection. Through rotating the needle body for the needle body adjusts the cover relatively and rotates, and needle body and adjusting collar are along axial relative movement under the cooperation of external thread and internal thread, thereby adjust the front and back relative position of needle body and adjusting collar, and it is more convenient to adjust.

Preferably, the receipts expand the strip be close to one side of the axis of needle body is equipped with the outer inclined plane that expands of second, the outer portion that expands of second is the outer inclined plane that expands of second, the outer inclined plane that expands of second is keeping away from in the past to the direction after gradually the axis of needle body, first outer portion that expands is the border of the leading flank of bracer. When the bracer moved forward for the adjusting sleeve, the border butt of the leading flank of bracer expanded the inclined plane outside the second on, under the guide that the inclined plane was expanded outside the second, the bracer will receive gradually and expand coupling assembling and strut, receive to expand the strip and remove along the direction of keeping away from the axis of needle body, realize expanding outward.

Preferably, the rear side of the adjusting sleeve is provided with a plurality of placing grooves, each placing groove is provided with a first opening facing the axis of the needle body, the plurality of retracting and expanding strips and the plurality of placing grooves are arranged in a one-to-one correspondence manner, the front ends of the retracting and expanding strips penetrate through the corresponding first openings and are arranged in the placing grooves, the retracting and expanding strips are connected with the corresponding placing grooves in a sliding manner, and the retracting and expanding strips can move in the placing grooves along the direction far away from or close to the axis of the needle body. The collecting and expanding strips slide in the placing groove to realize the purpose of moving along the direction far away from or close to the axis of the needle body.

Preferably, a clamping groove is formed in the expanding and contracting strip, the clamping groove is provided with a second opening back to the axis of the needle body, a clamping strip is fixedly arranged in the placing groove, the clamping strip penetrates through the second opening and is arranged in the clamping groove, the clamping groove can move in the direction away from or close to the axis of the needle body relative to the clamping strip, and the clamping strip and the clamping groove are used for limiting the expanding and contracting strip and the adjusting sleeve to move relative to each other in the front-back direction. The card strip sets up in the draw-in groove, can restrict to receive and expand the strip and adjust the cover relative movement in the front and back direction, and the card strip can restrict to receive to expand the strip and outwards deviate from the standing groove simultaneously.

Preferably, one of the planes where the axes of the supporting blocks are located is taken as an interface, two sides of the interface are respectively provided with a contraction and expansion area, at least one contraction and expansion strip is respectively arranged in the two contraction and expansion areas, and one contraction and expansion strip is only positioned in one contraction and expansion area. The nozzle of one catheter commonly used for establishing the subcutaneous tunnel is in a double-D shape, the two sides of an interface are respectively provided with a contraction and expansion strip, and the contraction and expansion strips are positioned in a contraction and expansion area, so that the subcutaneous tunnel needle assembly can also be connected with the catheter with the double-D-shaped nozzle in a matching way.

Preferably, the expanding connection assembly comprises four expanding strips which are uniformly distributed on the periphery of the support block. The four contracting and expanding strips are uniformly distributed on the periphery of the supporting block, so that the contracting and expanding connecting assembly can more uniformly expand the inner wall of the catheter.

Preferably, the contraction and expansion strip comprises a front contraction and expansion section and a rear contraction and expansion section, the front side of the front contraction and expansion section is movably connected with the adjusting sleeve, and the front contraction and expansion section is detachably connected with the rear contraction and expansion section. The post-flaring segment of the flaring strip is used for insertion into a catheter, which may have a different, or even irregular, orifice shape. The shape of the pipe orifice of different catheters is matched, and only the corresponding rear contraction and expansion section is required to be replaced, so that the replacement of the whole contraction and expansion strip is not required, and the adaptation range of the subcutaneous tunnel needle assembly is further expanded.

Preferably, the front side of the front expanding section is provided with a protruding block, the front side of the rear expanding section is provided with a first limiting groove, the first limiting groove is provided with a third opening facing the front side, the protruding block penetrates through the third opening and is arranged in the first limiting groove, and the protruding block is in interference fit with the first limiting groove. Preceding receipts expand the section and receive after with and expand the section and realize releasable connection through the interference fit of bulge and first spacing groove for it is more convenient to receive the dismantlement and the installation that expand the section after.

Preferably, first spacing groove still has the orientation the fourth opening of the axis of needle body, the section is expanded to the back receipts is close to one side of needle body is equipped with two second spacing grooves, two the second spacing groove is located respectively the both sides of fourth opening, two the second spacing groove all with first spacing groove intercommunication, be equipped with two second stoppers on the protruding piece, two the second stopper one-to-one locates two the second spacing inslot. When the front expansion section expands outwards, the rear expansion section can be driven to expand outwards synchronously through the matching of the second limiting block and the second limiting groove, and the connection stability of the front expansion section and the rear expansion section during external expansion is further improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic view of a hypodermic needle assembly according to an embodiment of the present invention;

FIG. 2 is another schematic view of a subcutaneous tunnel needle assembly in an embodiment of the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

fig. 4 is a rear view of a subcutaneous tunnel needle assembly in an embodiment of the present invention;

fig. 5 is a schematic structural view of an adjusting sleeve in an embodiment of the present invention;

FIG. 6 is a schematic structural view of a collecting and expanding strip according to an embodiment of the present invention;

FIG. 7 is a schematic structural view of a front expanding section in an embodiment of the present invention;

FIG. 8 is a schematic structural view of a rear expanding section in an embodiment of the present invention;

FIG. 9 is a schematic view of a double D-shaped orifice of a catheter in an embodiment of the present invention;

fig. 10 is a schematic structural view of the hypodermic needle assembly (for convenience of display, only the expanding strips on the upper and lower sides of the supporting block are shown) when the expanding connection assembly is not expanded;

fig. 11 is a schematic structural view of the hypodermic needle assembly (for convenience of display, only the expanding strips on the upper and lower sides of the supporting block are shown) when the expanding connection assembly of the embodiment of the present invention is expanding;

fig. 12 is a schematic structural diagram of the embodiment of the present invention, in which the conduit sleeve is disposed outside the expanding connection assembly (for convenience of display, only the expanding strips on the upper and lower sides of the supporting block are shown).

In the drawings: 1-needle body, 11-supporting block, 2-adjusting sleeve, 21-placing groove, 211-first opening, 212-clamping strip, 3-contracting and expanding connecting assembly, 31-contracting and expanding strip, 311-front contracting and expanding section, 3111-second outer expanding inclined plane, 3112-clamping groove, 3113-convex block, 31131-second limiting block, 31121-second opening, 312-rear contracting and expanding section, 3121-first limiting groove, 31211-third opening, 31212-fourth opening, 3122-second limiting groove, 4-interface, 41-contracting and expanding area and 6-catheter.

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, if directional indications such as up, down, left, right, front, back, etc. are referred to in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture, and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

As shown in fig. 1 to 12, the utility model provides a subcutaneous tunnel needle assembly, which comprises a needle body 1, an adjusting sleeve 2 and a contracting and expanding connecting component 3.

The axial direction of the needle body 1 is used as the front-back direction, the needle body 1 is arranged in the adjusting sleeve 2 in a penetrating mode, the needle body 1 is connected with the adjusting sleeve 2 in an adjustable mode, the relative position of the needle body 1 and the adjusting sleeve 2 in the front-back direction is adjustable, the supporting block 11 is arranged at the rear end of the needle body 1, and the adjusting sleeve 2 is arranged on the front side of the supporting block 11.

Receive to expand coupling assembling 3 and locate the rear side of adjusting collar 2, receive to expand coupling assembling 3 and include that at least two receive and expand strip 31, receive and expand strip 31 and extend along the fore-and-aft direction, all receive and expand strip 31 and encircle the periphery of bracer 11 and arrange, receive the front side swing joint who expands strip 31 on adjusting collar 2, receive and expand strip 31 and can keep away from or be close to the axis of needle body 1.

The supporting block 11 is provided with a first outward-expanding part, the contraction and expansion strip 31 is provided with a second outward-expanding part matched with the first outward-expanding part, and the first outward-expanding part and the second outward-expanding part are used for pushing the contraction and expansion strip 31 to be far away from the axis of the needle body 1.

This subcutaneous tunnel needle subassembly is when connecting catheter 6, receive to expand in connecting subassembly 3 stretches into the catheter 6 that needs to connect, refer to fig. 12, adjust needle body 1 and adjusting sleeve 2 relative position on the front and back direction, under the cooperation between first outer portion of expanding and the second outer portion of expanding for receive to expand the axis that the strip 31 kept away from needle body 1, receive to expand connecting subassembly 3 and outwards expand and prop tightly the inner wall of catheter 6, realize being connected between needle body 1 and the catheter 6. This technical scheme is through setting up the receipts that can expand outward and expand strip 31, the pipe 6 of adaptable different pipe diameters, and many receipts simultaneously expand strip 31 also can adapt to the cross section shape more than two kinds to realize the adaptable manifold pipe 6 of a subcutaneous tunnel needle subassembly, it is more convenient nimble during the use.

Referring to fig. 10, a schematic structural view of the hypodermic needle assembly when the collecting and expanding connecting component 3 is not expanded;

fig. 11 shows a schematic view of the structure of the subcutaneous tunnel needle assembly when the collecting and expanding connection assembly 3 is being expanded.

In some embodiments, the supporting block 11 is cylindrical, the supporting block 11 is fixedly disposed at the tail end of the needle body 1, and the supporting block 11 is disposed coaxially with the needle body 1. In other embodiments, the spacer 11 is pivotally attached to the trailing end of the needle body 1.

In some embodiments, the inner hole of the adjusting sleeve 2 is provided with an internal thread, the needle body 1 is provided with an external thread matching with the internal thread, the internal thread is in threaded connection with the external thread, and the needle body 1 and the adjusting sleeve 2 are in adjustable connection through the internal thread and the external thread. Through rotating needle body 1 for needle body 1 adjusts the cover 2 relatively and rotates, and needle body 1 and adjusting cover 2 move relatively along the axial under the cooperation of external thread and internal thread, thereby adjust the front and back relative position of needle body 1 and adjusting cover 2, it is more convenient to adjust.

In some embodiments, the side of the expanding strip 31 close to the axis of the needle body 1 is provided with a second expanding slope 3111, referring to fig. 6, the second expanding slope 3111 is a second expanding slope 3111, the second expanding slope 3111 is gradually far away from the axis of the needle body 1 in the front-to-back direction, and the first expanding slope is the edge of the front side surface of the supporting block 11. When the supporting block 11 moves forward relative to the adjusting sleeve 2, the edge of the front side surface of the supporting block 11 abuts against the second outward-expanding inclined surface 3111, under the guidance of the second outward-expanding inclined surface 3111, the supporting block 11 gradually expands the expanding and contracting connection assembly 3, and the expanding and contracting strip 31 moves in the direction away from the axis of the needle body 1, so that outward expansion is realized. When the contraction and expansion connecting assembly 3 needs to be contracted, the supporting block 11 moves backwards relative to the adjusting sleeve 2, the contraction and expansion strip 31 can freely move along the axis close to the needle body 1, and the contraction and expansion strip 31 does not support the catheter 6 any more. In some other embodiments, the supporting block 11 is provided with a first outward-expanding inclined surface corresponding to the second outward-expanding inclined surface 3111, the first outward-expanding inclined surface is a first outward-expanding portion, and the first outward-expanding inclined surface is gradually close to the axis of the needle body 1 in the front-to-back direction. The arrangement of the first outward-expanding inclined surface can reduce the abrasion speed of the supporting block 11 and the contraction and expansion strip 31, thereby prolonging the service life of the subcutaneous tunnel needle assembly.

In other embodiments, the first outwardly-expanding slope gradually gets away from the axis of the needle body 1 in the front-to-back direction, the second outwardly-expanding slope 3111 gradually gets close to the axis of the needle body 1 in the front-to-back direction, and the expanding strips 31 can be expanded when the supporting block 11 relatively moves backwards.

In some embodiments, the adjusting sleeve 2 is provided with a plurality of placing grooves 21 on the rear side, referring to fig. 5, each placing groove 21 has a first opening 211 facing the axis of the needle body 1, a plurality of expanding strips 31 are arranged in one-to-one correspondence with the plurality of placing grooves 21, the front ends of the expanding strips 31 pass through the corresponding first openings 211 and are arranged in the placing grooves 21, the expanding strips 31 are slidably connected with the corresponding placing grooves 21, and the expanding strips 31 can move in the placing grooves 21 in the direction away from or close to the axis of the needle body 1. The expanding strips 31 are intended to move in a direction away from or close to the axis of the needle body 1 by sliding in the placement grooves 21.

Furthermore, a clamping groove 3112 is arranged on the expanding strip 31, the clamping groove 3112 has a second opening 31121 facing away from the axis of the needle body 1, a clamping strip 212 is fixedly arranged in the placing groove 21, the clamping strip 212 passes through the second opening 31121 and is arranged in the clamping groove 3112, the clamping groove 3112 can move in the direction away from or close to the axis of the needle body 1 relative to the clamping strip 212, and the clamping strip 212 and the clamping groove 3112 are used for limiting the relative movement of the expanding strip 31 and the adjusting sleeve 2 in the front-back direction. The clamping strip 212 is disposed in the clamping groove 3112, and can limit the relative movement between the expanding strip 31 and the adjusting sleeve 2 in the front-back direction, and the clamping strip 212 can limit the expanding strip 31 from falling out of the placing groove 21.

In some embodiments, referring to fig. 4, one of the planes where the axes of the supporting blocks 11 are located is taken as the dividing plane 4, two sides of the dividing plane 4 are respectively provided with one expanding and contracting zone 41, at least one expanding and contracting strip 31 is respectively arranged in each of the two expanding and contracting zones 41, and one expanding and contracting strip 31 is only arranged in one expanding and contracting zone 41. One of the catheters 6 commonly used for establishing the subcutaneous tunnel has a nozzle in a double-D shape, referring to FIG. 9, that is, the catheter 6 has two inner flow passages inside, the two sides of the interface 4 are respectively provided with the contraction and expansion strips 31, and the contraction and expansion strips 31 enter into one contraction and expansion area 41, so that at least one contraction and expansion strip 31 is inserted into each of the two inner flow passages of the catheter 6, and the subcutaneous tunnel needle assembly can also be connected with the catheter 6 with the double-D nozzle in a matching manner.

In some embodiments, the expanding connection assembly 3 includes four expanding strips 31, and the four expanding strips 31 are uniformly distributed on the periphery of the supporting block 11. The four expanding strips 31 are uniformly distributed on the periphery of the supporting block 11, so that the expanding connecting component 3 can not cause excessive deformation of the conduit 6 when the inner wall of the conduit 6 is expanded. In other embodiments, two, three or six convergent divergent strips 31 may be provided in the convergent divergent connection module 3, and the specific number may be determined according to the cross-sectional shape of the conduit 6, for example, two, four or six convergent divergent strips 31 may be provided to accommodate at least two conduits 6 with circular cross-sectional shape and "double D" cross-sectional shape, and three convergent divergent strips 31 may be provided to accommodate at least a conduit 6 with circular cross-sectional shape and three internal flow passages.

In some embodiments, referring to fig. 6, the expanding strip 31 includes a front expanding section 311 and a rear expanding section 312, the front side of the front expanding section 311 is movably connected with the adjusting sleeve 2, and the front expanding section 311 is detachably connected with the rear expanding section 312. The rear convergent section 312 of the convergent strip 31 is used for inserting the catheter 6, and the shape of the orifice of the catheter 6 may be different, or may even be irregular. The shape of the pipe orifice of different catheters 6 can be matched, and only the corresponding rear contraction and expansion section 312 needs to be replaced, and the whole contraction and expansion strip 31 does not need to be replaced, so that the adaptation range of the subcutaneous tunnel needle assembly is further expanded.

Further, referring to fig. 7 and 8, a protruding block 3113 is disposed at a rear side of the front expanding section 311, a first limiting groove 3121 is disposed at a front side of the rear expanding section 312, the first limiting groove 3121 has a third opening 31211 facing the front side, the protruding block 3113 passes through the third opening 31211 and is disposed in the first limiting groove 3121, and the protruding block 3113 is in interference fit connection with the first limiting groove 3121. Preceding receipts expand section 311 and back receipts expand section 312 and realize releasable connection through bulge 3113 and first spacing groove 3121's interference fit for the dismantlement and the installation that the section 312 was expanded to back receipts are more convenient.

Further, the first limiting groove 3121 further has a fourth opening 31212 facing the axis of the needle body 1, one side of the rear expanding section 312 close to the needle body 1 is provided with two second limiting grooves 3122, the two second limiting grooves 3122 are respectively disposed on two sides of the fourth opening 31212, the two second limiting grooves 3122 are both communicated with the first limiting groove 3121, the protruding block 3113 is provided with two second limiting blocks 31131, and the two second limiting blocks 31131 are disposed in the two second limiting grooves 3122 in a one-to-one correspondence manner. When the front expansion section 311 expands outwards, the second limiting block 31131 and the second limiting groove 3122 are matched to drive the rear expansion section 312 to expand outwards synchronously, so that the connection stability of the front expansion section 311 and the rear expansion section 312 during external expansion is further improved.

In other embodiments, the front expanding section 311 and the rear expanding section 312 are detachably connected by screws.

In some embodiments, when all the strips 31 are closed to the extreme position, the rear ends of all the strips 31 form a tail, and the tail is conical, so as to facilitate the extension of the strips 31 into the catheter 6.

The above only is the preferred embodiment of the present invention, not so limiting the patent scope of the present invention, all under the inventive concept of the present invention, the equivalent structure transformation made by the contents of the specification and the drawings is utilized, or the direct/indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims (10)

1. A subcutaneous tunnel needle assembly is characterized by comprising a needle body (1), an adjusting sleeve (2) and a contraction and expansion connecting component (3);

the axial direction of the needle body (1) is taken as the front-back direction, the needle body (1) penetrates through the adjusting sleeve (2), the needle body (1) is adjustably connected with the adjusting sleeve (2), the relative positions of the needle body (1) and the adjusting sleeve (2) in the front-back direction are adjustable, a supporting block (11) is arranged at the rear end of the needle body (1), and the adjusting sleeve (2) is arranged on the front side of the supporting block (11);

the contraction and expansion connecting component (3) is arranged on the rear side of the adjusting sleeve (2), the contraction and expansion connecting component (3) comprises at least two contraction and expansion strips (31), the contraction and expansion strips (31) extend along the front-rear direction, all the contraction and expansion strips (31) are arranged around the periphery of the supporting block (11), the front side of each contraction and expansion strip (31) is movably connected to the adjusting sleeve (2), and the contraction and expansion strips (31) can be far away from or close to the axis of the needle body (1);

be equipped with the first portion that expands outward on kicking block (11), receive be equipped with on expanding strip (31) with the first portion that expands outward that expands matches the second that sets up, first expand outward the portion with the second expands outward the portion is used for promoting receive and expand strip (31) and keep away from the axis of needle body (1).

2. The subcutaneous tunnel needle assembly of claim 1, wherein: the hole of adjusting collar (2) is equipped with the internal thread, be equipped with on needle body (1) with the external screw thread that the internal thread matches the setting, the internal thread with external screw thread threaded connection, needle body (1) with adjusting collar (2) pass through the internal thread with the adjustable connection of external screw thread.

3. The subcutaneous tunnel needle assembly of claim 1, wherein: receive and expand one (31) be close to one side of the axis of needle body (1) is equipped with the second and expands inclined plane (3111) outward, the second expands the portion and does the second expands inclined plane (3111) outward, the second expands inclined plane (3111) outward and keeps away from gradually in the direction from the past to the back the axis of needle body (1), the first portion that expands outward is the border of the leading flank of bracer (11).

4. The subcutaneous tunneling needle assembly according to claim 1, wherein: the rear side of the adjusting sleeve (2) is provided with a plurality of placing grooves (21), the placing grooves (21) are provided with first openings (211) facing the axis of the needle body (1), a plurality of expanding and contracting strips (31) and the placing grooves (21) are arranged in a one-to-one correspondence mode, the front ends of the expanding and contracting strips (31) penetrate through the corresponding first openings (211) and are arranged in the placing grooves (21), the expanding and contracting strips (31) are connected with the corresponding placing grooves (21) in a sliding mode, and the expanding and contracting strips (31) can move in the placing grooves (21) along the direction far away from or close to the axis of the needle body (1).

5. The subcutaneous tunnel needle assembly of claim 4, wherein: be equipped with draw-in groove (3112) on receipts expand strip (31), draw-in groove (3112) have dorsad second opening (31121) of the axis of needle body (1), standing groove (21) internal fixation is provided with card strip (212), card strip (212) pass second opening (31121) and locate in draw-in groove (3112), draw-in groove (3112) can be relative card strip (212) are in keeping away from or being close to the direction of the axis of needle body (1) removes, card strip (212) with draw-in groove (3112) are used for the restriction receive expand strip (31) with adjusting collar (2) relative movement in the front and back direction.

6. The subcutaneous tunnel needle assembly of claim 1, wherein: one plane where the axis of the supporting block (11) is located is used as an interface (4), two sides of the interface (4) are respectively provided with a contraction and expansion area (41), at least one contraction and expansion strip (31) is respectively arranged in the two contraction and expansion areas (41), and one contraction and expansion strip (31) is only located in one contraction and expansion area (41).

7. The subcutaneous tunnel needle assembly of claim 1, wherein: the expanding connection component (3) comprises four expanding strips (31), and the four expanding strips (31) are uniformly distributed on the periphery of the support block (11).

8. The subcutaneous tunneling needle assembly according to claim 1, wherein: the contraction and expansion strip (31) comprises a front contraction and expansion section (311) and a rear contraction and expansion section (312), the front side of the front contraction and expansion section (311) is movably connected with the adjusting sleeve (2), and the front contraction and expansion section (311) is detachably connected with the rear contraction and expansion section (312).

9. The subcutaneous tunnel needle assembly of claim 8, wherein: the rear side of preceding receipts expand section (311) is equipped with protruding piece (3113), the front side of receipts expand section (312) is equipped with first spacing groove (3121), first spacing groove (3121) have towards third opening (31211) of front side, protruding piece (3113) pass third opening (31211) and locate in first spacing groove (3121), protruding piece (3113) with first spacing groove (3121) interference fit is connected.

10. The subcutaneous tunnel needle assembly of claim 9, wherein: first spacing groove (3121) still have the orientation fourth opening (31212) of the axis of needle body (1), the back is received and is expanded section (312) be close to one side of needle body (1) is equipped with two spacing grooves (3122), two spacing groove (3122) of second are located respectively the both sides of fourth opening (31212), two spacing groove (3122) of second all with first spacing groove (3121) intercommunication, be equipped with two second stopper (31131) on bulge (3113), two second stopper (31131) are located two one-to-one in spacing groove of second (3122).

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