CN115211905A

CN115211905A - Biopsy needle

Info

Publication number: CN115211905A
Application number: CN202210818262.3A
Authority: CN
Inventors: 彭愉林; 冯波; 曾俊华
Original assignee: Jingfang Precision Medical Device Shenzhen Co ltd
Current assignee: Jingfang Precision Medical Device Shenzhen Co ltd
Priority date: 2022-07-11
Filing date: 2022-07-11
Publication date: 2022-10-21
Also published as: WO2024012037A1

Abstract

The utility model relates to a biopsy needle, including upper cover, base, outer needle subassembly and interior needle subassembly, still be equipped with the safety buckle at the needle insertion end that upper cover and base lock formed, the safety buckle has coaxial rotation to install in the erection column of needle inlet, the erection column is seted up along the interior pinhole that the axial link up and is passed in order to supply interior needle pole, the periphery of erection column with needle inlet is equipped with to cooperate with the limit structure that moves backward that restricts the erection column axial rearward movement, the erection column still is equipped with the exposure and operates the portion of operation in order to operate the erection column pivoted in the needle inlet outside, it is protruding can block into to rotate an angle to rotate the operation portion be equipped with the screens on loading pole or the guide bar with the needle file is in order to prevent the ascending back-and-forth movement of needle in needle insertion direction in a screens inslot in at least one screens groove that at least one lock gear is corresponding. Because the safety buckle is limited at the needle inserting end formed by buckling the upper cover and the base and cannot move axially, the risk of falling does not exist, and the safe locking of the biopsy needle is effectively realized.

Description

Biopsy needle

Technical Field

The present application relates to medical aids, and more particularly to a biopsy needle.

Background

In recent years, tumors have been hidden around humans and the incidence of the tumors has been gradually increased. Early detection and timely treatment can greatly prevent the pathological changes of tumors, so that focus cells or tissues need to be punctured and sampled under the guidance of ultrasound for pathological analysis and diagnosis. One very important tool for needle sampling is a biopsy needle, of which a semi-automatic biopsy needle is more commonly used. For example, a semi-automatic biopsy needle is disclosed in the chinese utility model entitled "a manipulation structure and biopsy needle" with the grant publication No. CN 213075849U. However, the outer needle holder of such a semi-automatic biopsy needle does not have a sufficient limit structure for moving up and down, left and right, and thus has poor stability. Moreover, such semi-automatic biopsy needles are used by pulling the handle to load the cavity and then pushing the handle forward to fire, but no safety locking device is provided for the handle, which may cause the biopsy needle to be accidentally fired during the operation. Therefore, the chinese patent application with the publication number CN113303839A and the name "safety locking device for semi-automatic biopsy needle" discloses a safety locking device for a handle, wherein a locking member is inserted into a through hole at a transition section of the handle, and the locking member is moved along the through hole to switch between a locking state and an unlocking state as required, and the stroke of the handle in the locking state is obstructed by the locking member, so that the handle cannot be fired. However, the locking piece inserted into the handle outside the housing still has a risk of easy falling off, and the error triggering of the biopsy needle cannot be effectively avoided.

Disclosure of Invention

The technical problem that this application will solve lies in, to prior art's above-mentioned defect, provides one kind and can effectively realize safe locking and avoid the biopsy needle of mistake percussion.

The technical scheme adopted by the application for solving the technical problem is as follows: the utility model provides a biopsy needle, includes upper cover, base, outer needle subassembly and interior needle subassembly, the mutual lock of upper cover and base surrounds and forms the inner space and forms needle inlet, forms needle outlet at needle inlet end, outer needle subassembly includes outer needle file and fixed connection in the outer needle pipe of outer needle file, interior needle subassembly includes interior needle file and fixed connection in the interior needle bar of interior needle file, wherein:

the outer needle base is arranged in the inner spaces of the upper cover and the base in a reciprocating sliding manner along the needle inserting direction, the inner spaces of the outer needle base, the upper cover and the base are also provided with an elastic buckling structure which is matched in the reciprocating sliding direction to provide at least one buckling gear, and the outer needle tube penetrates through the needle outlet to extend out;

the inner needle rod penetrates through the needle inlet and then is inserted into the outer needle tube, the inner needle base is provided with a loading rod and a guide rod which extend along a direction parallel to the needle inlet direction and are inserted into the inner spaces of the upper cover and the base in a sliding manner, at least one of the loading rod and the guide rod and the outer needle base are provided with a clamping structure which is matched with each other so as to drive the outer needle base to move backwards while pulling the inner needle base to move backwards in the needle inlet direction, and the loading rod is also provided with a triggering structure which releases the buckling of the elastic clamping structure in the process of pushing the inner needle base to move forwards in the needle inlet direction;

the biopsy needle is characterized in that a safety buckle is further arranged at the needle inserting end formed by buckling the upper cover and the base, the safety buckle is provided with an installation column which is coaxially and rotatably installed at the needle inserting port, the installation column is provided with an inner needle hole which penetrates through the installation column along the axial direction and is used for an inner needle rod to penetrate through, the periphery of the installation column and the needle inserting port are provided with a backward movement limiting structure which is matched with the installation column to limit the installation column to move backwards along the axial direction, the installation column is further provided with a rotation operation part which is exposed outside the needle inserting port and is used for operating the rotation of the installation column, and the rotation operation part is provided with a clamping bulge which can be clamped into one clamping groove of at least one clamping groove corresponding to at least one buckling gear, which is formed in at least one of the loading rod and the guide rod after rotating for an angle so as to prevent the inner needle base from moving back and forth in the needle inserting direction;

the outer needle base and the safety catch are connected with an elastic piece which elastically deforms in the needle inserting direction in a butting mode, the elastic piece pulls the inner needle base and simultaneously drives the outer needle base to move backwards to the elastic buckling structure to be buckled at one buckling gear to be compressed, and the elastic piece pushes the inner needle base to move forwards to relieve the buckling of the elastic buckling structure and then elastically resets to drive the outer needle tube to be buckled.

In one embodiment of the biopsy needle according to the present application, the rearward movement limiting structure disposed between the outer periphery of the mounting post and the needle feeding end includes an annular groove formed by an annular flange formed on the outer periphery of the mounting post and an upper cover and a base of the needle feeding end, and the annular flange is mounted in the annular groove to limit the mounting post from moving axially rearward.

In an embodiment of the biopsy needle according to the present application, the elastic member is a spring, a rear end of the spring is sleeved on the mounting column and abuts against a front end surface of the ring flange, and a front end of the spring is mounted in a spring mounting hole formed in the outer needle base.

In an embodiment of the biopsy needle according to the present application, a first clamping groove is formed on a first side of the outer hub in the needle insertion direction, a second clamping groove is formed on a second side of the outer hub in the needle insertion direction, a first boss and a second boss protruding toward the first clamping groove and the second clamping groove are respectively formed at front ends of the loading rod and the guide rod of the inner hub, and the first boss and the second boss are respectively inserted into the first clamping groove and the second clamping groove to form a clamping structure; the inner needle base is pulled to move backwards until the first boss and the second boss respectively abut against the front ends of the first clamping groove and the second clamping groove to drive the outer needle base to move backwards together.

According to an embodiment of the biopsy needle of this application, the outer needle file is protruding at least a set of gear lug that corresponds with at least one lock gear relatively in the anterior of the first draw-in groove of the first side of needle-inserting direction, the inside wall of upper cover corresponding with the first side of outer needle file forms an elasticity trip, the elasticity trip with at least a set of gear lug cooperatees in order to constitute elasticity lock structure.

In one embodiment of the biopsy needle according to the application, the firing structure of the loading rod of the inner needle base is a firing inclined plane formed on the other side, far away from the outer needle base, of the first boss at the front end of the loading rod; in the process of pushing the inner needle base to move forwards, the first boss at the front end of the loading rod passes through the middle channel of each gear bump in the at least one group of gear bumps, and the triggering inclined plane at the front end of the loading rod pushes the elastic clamping hook outwards to release the buckling of the elastic clamping hook and the gear bumps.

According to one embodiment of the biopsy needle, the guide bars and the loading bars are provided with guide ribs on the upper portions of the front ends, and the guide ribs are respectively slidably arranged in guide sliding grooves correspondingly formed in the top of the inner side of the upper cover.

According to one embodiment of the biopsy needle, the top of the outer needle base in the needle inserting direction is provided with an upper limiting block, the upper limiting block is provided with a first limiting top surface, a first limiting left side surface and a first limiting right side surface, the top of the inner side of the upper cover is provided with an upper limiting sliding groove used for installing the upper limiting block, the upper limiting sliding groove is provided with an upper limiting sliding groove left side surface and an upper limiting sliding groove right side surface, the second limiting top surface is in butt fit with the first limiting top surface of the upper limiting block, and the upper limiting sliding groove left side surface and the upper limiting sliding groove right side surface are in butt fit with the first limiting left side surface and the first limiting right side surface of the upper limiting block respectively; outer needle file is equipped with down spacing piece in the ascending bottom of needle feeding direction, spacing piece has first spacing bottom surface, the spacing left surface of second and the spacing right flank of second down, the base is offered and is used for the installation spacing spout down of spacing piece, down spacing spout have with the spacing bottom surface of the first spacing bottom surface butt complex second of spacing piece down and with the spacing left surface of the second of spacing piece and the spacing right flank of second are butt complex down respectively and are spacing spout left surface and lower spacing spout right flank down.

According to an embodiment of the biopsy needle, the upper cover is provided with at least one window corresponding to at least one buckling gear of the outer needle base, and a gear mark is arranged corresponding to each window.

In one embodiment of the biopsy needle according to the present application, the base further forms a hand-held ring on each of the left and right sides in the needle insertion direction, and a rubber pad is embedded in the inner circumference of the hand-held ring.

The biopsy needle for implementing the application has the following beneficial effects: according to the biopsy needle of the embodiment of the application, the safety buckle which can rotate but cannot move axially is arranged at the needle inserting end formed by buckling the upper cover and the base, the clamping protrusion on the rotating operation part of the safety buckle rotates for a certain angle and then is clamped into the clamping groove on the loading rod or the guide rod of the inner needle base to lock the inner needle base, so that the error triggering is prevented, and the safety buckle is rotated reversely to enable the clamping protrusion to be separated from the clamping groove so as to release the locking of the inner needle base. Because the safety catch is limited at the needle inserting end formed by buckling the upper cover and the base and cannot move axially, the risk of falling does not exist, and the safety locking of the biopsy needle is effectively realized. In addition, according to the biopsy needle of this application embodiment still can make outer needle file only axial displacement, can not move about from top to bottom through the lock of upper cover and base to improve the stability of biopsy needle.

Drawings

The application will be further described with reference to the following drawings and examples, in which:

FIG. 1 is a schematic view of the overall structure of a biopsy needle according to an embodiment of the present application;

FIG. 2 is an exploded view of the biopsy needle shown in FIG. 1;

FIG. 3 is a schematic structural diagram of an upper cover according to an embodiment of the present application;

FIG. 4 is a schematic structural view of an outer needle assembly of one embodiment of the present application;

FIG. 5 is a schematic view of another angled configuration of the outer needle assembly shown in FIG. 4;

FIG. 6 is a schematic structural view of an inner needle assembly of one embodiment of the present application;

FIG. 7 is a schematic structural diagram of a safety catch according to an embodiment of the present application;

FIG. 8 is a schematic view of a base of an embodiment of the present application;

FIG. 9 is a cross-sectional view of a biopsy needle of one embodiment of the present application in an initial configuration;

FIG. 10 is a cross-sectional view of the biopsy needle illustrated in FIG. 9 in a first latched gear position;

FIG. 11 is a cross-sectional view of the biopsy needle shown in FIG. 9 in a second engaged gear position;

FIG. 12 is a cross-sectional view of an embodiment of the present application showing the initial state of the safety catch;

figure 13 is a cross-sectional view of the safety catch of figure 12 in a locked position.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application. Also, the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

Fig. 1 and 2 show an overall and exploded schematic view, respectively, of a biopsy needle 100 according to an embodiment of the present application. As shown in fig. 1 and 2, the biopsy needle 100 is mainly composed of an upper cover 10, a base 20, an outer needle assembly 30, an inner needle assembly 40, a safety catch 50, and a spring 60. The cover 10 and the base 20 are fastened to each other to enclose an inner space and form a needle inlet (not visible in fig. 1) at the needle inlet and a needle outlet 80 (shown in fig. 1) at the needle outlet. As shown in fig. 2 in combination with fig. 3 and 8, two

buckles

111 and 112 respectively extend downwards from the left and right sides of the upper cover 10 in the needle insertion direction, and mounting

guide positioning posts

182a and 182b extending downwards are provided on the left and right sides of the front end in the needle insertion direction; correspondingly, the base 20 has left and

right slots

221 and 222 for snap-fitting with the

clips

111 and 112, and mounting

guide positioning holes

242a and 242b for inserting the mounting

guide positioning posts

182a and 182 b. The two installation

guide positioning posts

182a and 182b of the upper cover 10 are inserted into the two installation

guide positioning holes

242a and 242b of the base 20, and the

fasteners

111 and 112 on the two sides of the upper cover 10 are fastened into the

fastening slots

221 and 222 on the two sides of the base 20, so that the upper cover 10 and the base 20 can be fastened. Outer needle assembly 30 includes an outer needle hub 31 and an outer needle tube 32 fixedly attached to outer needle hub 31. The outer needle holder 31 is slidably installed in the inner space of the upper cover 10 and the base 20 in a reciprocating manner in the needle inserting direction, and the outer needle tube 32 protrudes through the needle outlet 80. The inner needle assembly 40 includes an inner needle holder 41 and an inner needle rod 42 fixedly connected to the inner needle holder 41, and the inner needle rod 42 is inserted into the outer needle tube 32 after passing through the needle inlet. The front end of the inner needle rod 42 is provided with a sampling groove 421. The safety catch 50 is mounted at the needle insertion end formed by buckling the upper cover 10 and the base 20, and is used for locking and unlocking the inner needle base 41 in the forward and backward movement in the needle insertion direction. The spring 60 abuts between the outer hub 31 and the safety catch 50 to provide elastic deformation in the needle insertion direction.

Specifically, as shown in fig. 3, 4, 5 and 8, the outer needle holder 31 is provided with an upper stopper 311 at the top in the needle insertion direction, and the upper stopper 311 has a first stopper top surface 3113, a first stopper left side surface 3111 and a first stopper right side surface 3112. Correspondingly, the top of the inner side of the upper cover 10 is provided with an upper limiting sliding groove 17 for mounting the upper limiting block 311, and the upper limiting sliding groove 17 has a second limiting top surface 173, an upper limiting sliding groove left side surface 171 and an upper limiting sliding groove right side surface 172. After the upper cover 10 is fastened to the base 20, the second limiting top surface 173 of the upper limiting sliding groove 17 is in abutting fit with the first limiting top surface 3113 of the upper limiting block 311, and the upper limiting sliding groove left side surface 171 and the upper limiting sliding groove right side surface 172 of the upper limiting sliding groove 17 are in abutting fit with the first limiting left side surface 3111 and the first limiting right side surface 3112 of the upper limiting block 311 respectively. In addition, the outer needle base 31 is provided with a lower limiting block 313 at the bottom in the needle inserting direction, and the lower limiting block 313 has a first limiting bottom surface 3133, a second limiting left side surface 3131 and a second limiting right side surface 3132. Correspondingly, the base 40 is provided with a lower limiting chute 25 for mounting the lower limiting block 313. When the upper cover 10 is fastened to the base 20, the second limiting bottom surface 253 of the lower limiting sliding groove 25 is abutted to and matched with the first limiting bottom surface 3133 of the lower limiting block 313, and the lower limiting sliding groove left side surface 251 and the lower limiting sliding groove right side surface 252 of the lower limiting sliding groove 25 are respectively abutted to and matched with the second limiting left side surface 3131 and the second limiting right side surface 3132 of the lower limiting block 313. In this way, the outer needle holder 30 can only slide back and forth in the needle insertion direction in the inner space formed by the buckling of the upper cover 10 and the base 20, and cannot move up and down, left and right, so that the biopsy needle 100 is very stable in the loading and firing processes.

Referring to fig. 3 and 8, the upper cover 10 has a first T-shaped semi-cylindrical recess 16 at the needle outlet end, the base 20 has a second T-shaped semi-cylindrical recess 23 at the needle outlet end, the upper cover 10 and the base 20 are fastened to enclose a T-shaped cylindrical space at the needle outlet 80, and a T-shaped cylindrical member 321 is installed therein to guide the outer needle tube 32 of the outer needle assembly 30 to pass through, thereby ensuring the coaxiality of the puncture. Meanwhile, the upper cover 10 is provided with a first arc-shaped groove 181 and a second arc-shaped groove 183 which are communicated with each other at the needle inserting end, the base 20 is provided with a third arc-shaped groove 241 corresponding to the first arc-shaped groove 181 at the needle inserting end, and the upper cover 10 and the base 20 are buckled to enclose a needle inserting port for installing the safety buckle 50 to allow the inner needle rod 42 of the inner needle assembly 40 to penetrate.

Referring to fig. 4, the outer needle holder 31 is formed with a spring mounting hole 312 extending from a rear end to a front end in the needle insertion direction for mounting the spring 60, and a front end of the spring 60 abuts against a front end face of the spring mounting hole 312. Referring again to fig. 9, the rear end of the spring 60 is fitted over the mounting post 51 of the safety catch 50 and abuts against the front end face of the annular flange 52. In this way, when the outer hub 30 slides backward in the inner space formed by the snap-fit of the cover 10 and the base 20, the spring 60 is compressed.

Referring to fig. 4 and 5, a first engaging groove 318 extending along the needle inserting direction is formed on a first side (i.e. right side) of the outer needle holder 31 in the needle inserting direction, a second engaging groove 314 extending along the needle inserting direction is formed on a second side (i.e. left side) of the outer needle holder 31 in the needle inserting direction, and the first engaging groove 318 and the second engaging groove 314 are respectively used for cooperating with the first boss 414b and the second boss 414a on the inner needle holder 41 to drive the outer needle holder 31 to move backward along with the inner needle holder 41. Moreover, the first side (i.e. the right side) of the outer needle holder 31 in the needle insertion direction also protrudes with respect to the front of the second engaging groove 318 with a first set of

shift projections

315a and 315b and a second set of

shift projections

316a and 316b, and a channel 317 facing the second engaging groove 318 is formed between the first set of two

shift projections

315a and 315b and between the second set of two

shift projections

316a and 316 b. The first set of

shift position projections

315a, 315b and the second set of

shift position projections

316a, 316b correspond to two strokes of the outer needle holder 31 moving backward from the initial state, i.e. two engagement shift positions of the biopsy needle 100, respectively. Referring to fig. 3 again, an elastic hook 19 is formed on the inner sidewall of the upper cap 10 corresponding to the first side (i.e., the right side) of the outer needle holder 31. The elastic hook 19 can be pressed against the first set of

shift projections

315a, 315b or the second set of

shift projections

316a, 316b to limit the forward movement of the outer needle holder 31 after the outer needle holder 31 passes over the first set of

shift projections

315a, 315b or the second set of

shift projections

316a, 316b in the process of moving backward relative to the upper cover 10, so as to prevent the outer needle holder 31 from moving forward, and ensure that the outer needle holder 31 is in the first engaging position or the second engaging position corresponding to the first set of

shift projections

315a, 315b or the second set of

shift projections

316a, 316 b. Thus, the outer needle seat 31 is designed to have two engaging positions in the reciprocating sliding direction by the elastic engaging structure formed by the elastic hook 19 and the first and second

engaging position protrusions

315a, 315b and 316a, 316b in the inner space formed by the upper cover 10 and the base 20.

Referring to fig. 6 again, the inner needle holder 41 includes a holding portion 411, and the inner needle shaft 42 is fixedly connected to the holding portion 411. The inner needle holder 41 further extends from the front end of the handle 411 in a direction parallel to the needle insertion direction (i.e., the axial direction of the inner needle tube 42) to form a guide rod 413 and a loading rod 412, and the guide rod 413 and the loading rod 412 are respectively disposed on the left and right sides of the inner needle tube 42. The upper cover 10 is also provided with a first guide slot 185 and a second guide slot 184 on the left and right sides of the needle inlet for the loading rod 412 and the guide rod 413 of the inner needle holder 41 to insert, so as to provide a guiding function for the forward and backward movement of the inner needle holder 41. As further shown in fig. 6, the front end of the loading rod 412 is provided with a first boss 414b protruding into the first locking groove 318 on the right side of the outer hub 31, and the front end of the guiding rod 413 is provided with a second boss 414a protruding into the second locking groove 314 on the left side of the outer hub 31. The first boss 414b and the second boss 414a are respectively placed into the first locking groove 318 and the second locking groove 314 to abut against the rear end surface 3181 of the first locking groove 318 and the rear end surface 3141 of the second locking groove 314, so as to form a clamping structure capable of pulling the inner needle holder 41 to move backwards in the needle inserting direction and simultaneously driving the outer needle holder 31 to move backwards. Meanwhile, the

guide ribs

416a and 416b are arranged at the upper parts of the front ends of the guide rod 413 and the loading rod 412, and the

guide ribs

416a and 416b are respectively arranged in the

guide sliding grooves

186a and 186b formed at the top of the inner side of the upper cover 10 in a sliding manner, so that a further guide effect can be provided for the forward and backward movement of the inner needle seat 41, the shaking of the inner needle seat 41 after being pulled out and loaded is reduced, and the stability of the biopsy needle 100 is enhanced. At the same time, the engagement of the

guide ribs

416a and 416b with the

guide grooves

186a and 186b prevents the inner hub 41 from being completely pulled out from the rear end. Further, the other side of the first boss 414b at the front end of the loading rod 412 far from the outer needle holder 31 forms a firing bevel 417. In the process of pushing the inner needle holder 41 forward, the first boss 414b at the front end of the loading rod 412 enters the middle channel 317 of the first gear

shift position protrusions

315a and 315b and the second gear

shift position protrusions

316a and 316b along the first locking groove 318 on the outer needle holder 31 and can pass through the channel 317, and meanwhile, the trigger inclined plane 417 at the front end of the loading rod 412 can push the elastic hook 19 outward, so that the elastic hook 19 is separated from the abutment with the first gear

shift position protrusions

315a and 315b or the second gear

shift position protrusions

316a and 316b, and the fastening of the elastic hook 19 and the first gear

shift position protrusions

315a and 315b or the second gear

shift position protrusions

316a and 316b is released. Thus, the outer needle holder 31 is instantaneously pushed forward by the elastic force of the compressed spring 60, thereby driving the outer needle tube 32 to be fired and piercing the target site. In accordance with various embodiments of the present application, the firing ramp 417 can be replaced by other firing structures that can also release the resilient latch structure during the process of pushing the inner hub 41 forward.

The following detailed description of the loading and firing of the biopsy needle according to one embodiment of the present application is provided in conjunction with fig. 9, 10 and 11: first, as shown in fig. 9 in an initial state, the elastic hooks 19 of the upper cover 10 are located behind the first set of

shift projections

315a, 315b of the outer hub 31, the spring 60 is in the initial state, and the first bosses 414b and the second bosses 414a at the front ends of the loading rod 412 and the guide rod 413 of the inner hub 41 extend into the first locking grooves 318 and the second locking grooves 314 of the outer hub 31 to abut against the rear end surfaces of the first locking grooves 318 and the second locking grooves 314, respectively. Then, as shown in fig. 10, the handle 411 of the inner needle holder 41 is pulled backward, and the outer needle holder 31 is moved backward to perform the loading operation by the abutment of the first boss 414b and the second boss 414a at the front ends of the loading rod 412 and the guide rod 413 with the rear end surfaces of the first locking groove 318 and the second locking groove 314, so that the spring 60 is gradually compressed. When the outer needle seat 31 moves backward until the elastic hook 19 passes over the first set of

shift position protrusions

315a and 315b, the elastic hook 19 is engaged with the first set of

shift position protrusions

315a and 315b, so as to prevent the outer needle seat 31 from moving forward under the elastic force of the spring 60. At this time, biopsy needle 100 is in the first latched position of cocking. Then, as shown in fig. 11, the handle 411 of the inner needle holder 41 is pulled back, and the first boss 414b and the second boss 414a at the front ends of the loading rod 412 and the guide rod 413 abut against the rear end surfaces of the first locking groove 318 and the second locking groove 314, and simultaneously drive the outer needle holder 31 to move back, so that the spring 60 is further compressed. When the outer needle seat 31 moves backward until the elastic hook 19 passes over the second set of

shift position protrusions

316a and 316b, the elastic hook 19 is engaged with the second set of

shift position protrusions

316a and 316b to prevent the outer needle seat 31 from moving forward under the elastic force of the spring 60. At this time, biopsy needle 100 is in the second, latched position of cocking. When the biopsy needle 100 needs to be fired during the operation, no matter the biopsy needle 100 is in the first engaging position shown in fig. 10 or the second engaging position shown in fig. 11, the handle 411 of the inner needle holder 41 is pushed forward, so that the first boss 414b at the front end of the loading rod 412 moves forward along the first engaging groove 318 on the outer needle holder 31 to enter the middle channel 317 between the first set of

gear position bosses

315a, 315b and the second set of

gear position bosses

316a, 316b, and simultaneously, the firing inclined plane 417 at the front end of the loading rod 412 pushes the elastic hook 19 outward, so that the elastic hook 19 is disengaged from the first set of

gear position bosses

315a, 315b or the second set of

gear position bosses

316a, 316b, and the engagement is released, and thus the outer needle holder 31 is instantly pushed forward under the elastic force of the compressed spring 60, thereby driving the outer needle tube 32 to be fired.

Referring further to fig. 1 and 7, biopsy needle 100 is also provided with a safety catch 50. The safety catch 50 is mounted at the needle insertion end formed by buckling the upper cover 10 and the base 20, and is used for locking and unlocking the inner needle base 41 in the forward and backward movement in the needle insertion direction to prevent misoperation. Specifically, as shown in fig. 7, the safety catch 50 has a mounting post 51, and the mounting post 51 is opened with an inner needle hole 511 penetrating in the axial direction for the inner needle rod 42 to pass through. An annular flange 52 is formed on the periphery of the mounting post 51, and correspondingly, the upper cover 10 and the base 20 are respectively provided with a first arc-shaped groove 181 (see fig. 3) and a third arc-shaped groove 241 (see fig. 8) at the needle insertion end, which jointly enclose an annular groove coaxial with the needle insertion port after the upper cover 10 and the base 20 are fastened, the annular flange 52 of the safety catch 50 is installed in the annular groove so as to be limited to move backwards along the axial direction, and meanwhile, the spring 60 is sleeved on the mounting post 51 and abutted against the front end surface of the annular flange 52 so as to limit the annular flange 52 to move forwards along the axial direction, so that the annular flange 52 can only rotate around the axial direction in the annular groove enclosed by the first arc-shaped groove 181 and the third arc-shaped groove 241, and the whole safety catch 50 cannot be pulled out from the needle insertion end. As shown in FIG. 7, the rear end of the mounting post 51 is provided with a rotation operation part 53 exposed outside the needle inlet, and the rotation operation part 53 is provided with an operation protrusion 531 and a locking protrusion 532. Meanwhile, the loading lever 412 of the inner hub 41 is provided with a first locking groove 415a, a second locking groove 415b and a third locking groove 415c (see fig. 6) corresponding to the initial position, the first locking shift position and the second locking shift position, respectively. When the biopsy needle 100 is inserted into the lesion site in the initial state shown in fig. 9, the operation protrusion 531 of the safety catch 50 is held by hand to drive the safety catch 50 to rotate by a certain angle to lock the locking protrusion 532 into the corresponding first locking groove 415a (see fig. 13), so as to prevent the inner needle holder 41 from moving back and forth in the needle insertion direction, and facilitate the continuous adjustment of the direction of the biopsy needle 100, so as to achieve the optimal sampling state. When the biopsy needle 100 is loaded, the inner needle base 41 is pulled backwards to load the biopsy needle 100 to the first locking gear or the second locking gear, the operation protrusion 531 of the hand-held safety catch 50 drives the safety catch 50 to rotate by a certain angle to lock the locking protrusion 532 into the corresponding second locking groove 415b or the third locking groove 415c, so that the inner needle base 41 can be prevented from moving forwards and backwards in the needle inserting direction, and the false firing is prevented. In addition, since the rear end of the spring 60 abuts against the front end surface of the annular flange 52 of the safety catch 50, the rearward acting force generated by the compression of the spring 60 pushes against the circular flange 52, so that the annular flange 52 has a certain rotational friction force in the annular groove and cannot rotate freely, and a user needs to apply a certain rotational acting force to the safety catch 50 through the operation protrusion 531 to drive the retaining protrusion 532 to be clamped into or released from the first retaining groove 415a, the second retaining groove 415b or the third retaining groove 415c, thereby ensuring that the safety catch 50 effectively locks the inner needle holder 41.

The biopsy needle 100 according to the above embodiment of the present application is provided with the safety catch 50 that is rotatable but not axially movable at the needle insertion end where the upper cover 10 and the base 20 are fastened together, and the locking protrusion 532 of the rotation operation portion 53 of the safety catch 50 rotates by a certain angle and then is locked in the first locking groove 415a, the second locking groove 415b, or the third locking groove 415c of the loading lever 412 of the inner needle holder 41, thereby preventing an erroneous operation. The locking of the inner hub 41 can be released by rotating the safety catch 50 in the reverse direction to disengage the retaining projection 532 from the first retaining groove 415a, the second retaining groove 415b or the third retaining groove 415 c. Since the safety catch 50 is limited at the needle insertion end formed by buckling the upper cover 10 and the base 20 and cannot move axially, the risk of falling off does not exist, and the safe locking of the biopsy needle 100 is effectively realized.

Further, as shown in fig. 2, the upper cover 10 is opened with a first window 131 and a second window 132 corresponding to the first engaging range and the second engaging range of the outer needle holder 31, and a first gear mark 141 and a second mark 142 are respectively disposed corresponding to the first window 131 and the second window 132, so as to facilitate operation differentiation and checking. For example, by moving the outer needle holder 31 relative to the upper cover 10, the color of the outer needle holder 31 is displayed in the first window 131 and the second window 132, and the corresponding loaded engagement gear is synchronized. The top of the upper cover 10 may also be provided with a recess 15 for attaching a needle type label for distinguishing needle type specifications of the biopsy needle.

Further, as shown in fig. 2 and 8, the base 20 is further formed with two hand-held

rings

21a and 21b on the left and right sides in the needle insertion direction to facilitate the operation of the biopsy needle 100. And,

rubber pads

70a and 70b are respectively fitted to the inner circumferences of the two hand-held

rings

21a and 21b to enhance the comfort of use. As shown in fig. 8, a circle of limiting ribs 211 is protruded from the inner periphery of each

hand ring

21a, 21b, the circle of limiting ribs 211 forms a notch 212 at a portion close to the base body, and a strip-shaped boss 213 is disposed in the notch 212. The

rubber pads

70a, 70b have an outline matched with the inner peripheries of the hand-held

rings

21a, 21b, and a circle of groove 71 is formed on the outer peripheries of the

rubber pads

70a, 70b for being assembled with the limiting ribs 211 of the hand-held

rings

21a, 21b to limit the up-and-down movement of the

rubber pads

70a, 70 b. The

rubber pads

70a, 70b are further provided with openings 72 corresponding to the bar-shaped bosses 213 of the handle rings 21a, 21b for the bar-shaped bosses 213 to be inserted, and a wider open groove 73 is formed at the inner side of the opening 72 for being fitted with the wrapping sheets 12 corresponding to the two sides of the upper cover 10 and protruding downward. When the cover 10 and the base 20 are fastened together, the wrapping sheet 12 is inserted into the open slots 73 of the

rubber pads

70a and 70b to close the open slots 73 (see fig. 1), thereby preventing the

rubber pads

70a and 70b from falling off the handle rings 21a and 21 b.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. The utility model provides a biopsy needle, includes upper cover, base, outer needle subassembly and interior needle subassembly, upper cover and base inter combination surround and form the inner space and form needle inlet, form needle outlet at needle inlet end, the outer needle subassembly includes outer needle file and fixed connection in the outer needle pipe of outer needle file, interior needle subassembly includes interior needle file and fixed connection in the interior needle bar of interior needle file, its characterized in that:

the inner needle bar penetrates through the needle inlet and then is inserted into the outer needle tube, the inner needle base is provided with a loading bar and a guide bar which extend along the direction parallel to the needle inlet direction and are inserted into the inner spaces of the upper cover and the base in a sliding manner, at least one of the loading bar and the guide bar and the outer needle base are provided with a clamping structure which is matched with each other so as to drive the outer needle base to move backwards while pulling the inner needle base to move backwards in the needle inlet direction, and the loading bar is also provided with a triggering structure which is used for releasing the buckling of the elastic clamping structure in the process of pushing the inner needle base to move forwards in the needle inlet direction;

the biopsy needle is characterized in that a safety buckle is further arranged at the needle inserting end formed by buckling the upper cover and the base, the safety buckle is provided with a mounting column which is coaxially and rotatably mounted at the needle inserting opening, the mounting column is provided with an inner needle hole which penetrates through the mounting column along the axial direction and is used for an inner needle rod to pass through, the periphery of the mounting column and the needle inserting opening are provided with a backward movement limiting structure which is matched with the needle inserting opening to limit the mounting column to move backwards along the axial direction, the mounting column is further provided with a rotation operation part which is exposed outside the needle inserting opening to operate the rotation of the mounting column, and the rotation operation part is provided with a clamping bulge which can be clamped into one of at least one clamping groove which is formed in at least one of the loading rod and the guide rod and corresponds to at least one buckling gear after rotating for an angle so as to prevent the inner needle base from moving backwards and forwards in the needle inserting direction;

an elastic piece which elastically deforms in the needle inserting direction is abutted between the outer needle base and the safety catch, the elastic piece pulls the inner needle base and simultaneously drives the outer needle base to move backwards to the elastic buckling structure to be buckled at one buckling gear to be compressed, and the elastic piece pushes the inner needle base to move forwards to release the buckling of the elastic buckling structure and elastically resets to drive the outer needle tube to be buckled.

2. The biopsy needle of claim 1, wherein the rearward movement limiting structure disposed between the outer periphery of the mounting post and the needle feeding end comprises an annular groove defined by an annular flange formed on the outer periphery of the mounting post and an upper cover and a base of the needle feeding end, the annular flange being mounted in the annular groove to limit the mounting post from moving axially rearward.

3. The biopsy needle according to claim 2, wherein the elastic member is a spring, a rear end of the spring is sleeved on the mounting column and abuts against a front end face of the ring flange, and a front end of the spring is mounted in a spring mounting hole formed in the outer needle base.

4. The biopsy needle according to claim 1, wherein a first clamping groove is formed on a first side of the outer needle base in the needle insertion direction, a second clamping groove is formed on a second side of the outer needle base in the needle insertion direction, a first boss and a second boss which respectively protrude towards the first clamping groove and the second clamping groove are respectively arranged at the front ends of the loading rod and the guide rod of the inner needle base, and the first boss and the second boss are respectively arranged in the first clamping groove and the second clamping groove to form a clamping structure; the inner needle base is pulled to move backwards until the first boss and the second boss respectively abut against the front ends of the first clamping groove and the second clamping groove to drive the outer needle base to move backwards together.

5. The biopsy needle of claim 4, wherein at least one set of gear protrusions corresponding to the at least one locking gear protrude from the front portion of the first slot on the first side of the outer needle base in the needle insertion direction, and an elastic hook is formed on the inner side wall of the upper cover corresponding to the first side of the outer needle base, and the elastic hook cooperates with the at least one set of gear protrusions to form the elastic locking structure.

6. The biopsy needle of claim 5, wherein the firing structure of the loading bar of the inner hub is a firing ramp formed on the other side of the first boss at the front end of the loading bar away from the outer hub; in the process of pushing the inner needle base to move forwards, the first boss at the front end of the loading rod passes through the middle channel of each gear bump in the at least one group of gear bumps, and the triggering inclined plane at the front end of the loading rod pushes the elastic clamping hook outwards to release the buckling of the elastic clamping hook and the gear bumps.

7. The biopsy needle of claim 6, wherein the guide bars and the loading bar are provided with guide ribs at the upper parts of the front ends thereof, and the guide ribs are respectively slidably arranged in guide chutes correspondingly formed at the top of the inner side of the upper cover.

8. The biopsy needle according to claim 1, wherein an upper limiting block is arranged at the top of the outer needle base in the needle inserting direction, the upper limiting block is provided with a first limiting top surface, a first limiting left side surface and a first limiting right side surface, an upper limiting sliding groove for installing the upper limiting block is formed at the top of the inner side of the upper cover, the upper limiting sliding groove is provided with an upper limiting sliding groove left side surface and an upper limiting sliding groove right side surface, the upper limiting sliding groove left side surface and the upper limiting sliding groove right side surface are respectively in abutting fit with a second limiting top surface in abutting fit with the first limiting top surface of the upper limiting block and the first limiting left side surface and the first limiting right side surface of the upper limiting block; outer needle file is equipped with down spacing piece in the ascending bottom of needle feeding direction, spacing piece has first spacing bottom surface, the spacing left surface of second and the spacing right flank of second down, the base is offered and is used for the installation spacing spout down of spacing piece, down spacing spout have with the spacing bottom surface of the first spacing bottom surface butt complex second of spacing piece down and with the spacing left surface of the second of spacing piece and the spacing right flank of second are butt complex down respectively and are spacing spout left surface and lower spacing spout right flank down.

9. The biopsy needle of claim 1, wherein the upper cover is opened with at least one window corresponding to the at least one snap-fit gear of the outer needle holder, and a gear mark is provided corresponding to each window.

10. The biopsy needle according to claim 1, wherein the base further forms a hand ring at each of left and right sides in the needle insertion direction, and a rubber pad is fitted into an inner periphery of the hand ring.