CN117137536A - Firing control mechanism of biopsy needle and biopsy needle - Google Patents

Abstract

The utility model relates to the technical field of medical instruments, in particular to a firing control mechanism of a biopsy needle and the biopsy needle. The firing control mechanism at least comprises a blocking part, an avoidance groove and an elastic arm, wherein the blocking part is arranged on one side of the front surface of the inner needle sliding block, which is close to the outer needle sliding block; the avoidance groove is arranged at the proximal end of the blocking part, and a height drop is arranged between the avoidance groove and the blocking part; one end of the elastic arm is fixedly arranged, the free end of the elastic arm is provided with a convex part facing one side of the blocking part, the convex part is positioned between the first key and the blocking part in a winding state, and the convex part enters the avoidance groove when the inner puncture needle is stopped or is about to stop moving after being triggered. The firing control mechanism with the structure can ensure that the firing interval between the inner puncture needle and the outer puncture needle is not influenced by human operation factors any more, and the outer puncture needle is fired again when the inner puncture needle stops moving or is about to stop moving after being fired, thereby ensuring the success rate of sampling.

Description

Firing control mechanism of biopsy needle and biopsy needle

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a firing control mechanism of a biopsy needle and the biopsy needle.

Background

The biopsy device is a medical instrument, is suitable for biopsy sampling, cell sucking and the like of various organs such as liver, kidney, lung, prostate, mammary gland, thyroid gland and the like, and has the characteristics of simple and quick operation, convenient use, quick sampling and the like.

As shown in fig. 1, the biopsy needle comprises an inner puncture needle 10 and an outer puncture needle 20 sleeved on the inner puncture needle, wherein a sampling groove 11 is arranged at a position of the inner puncture needle 10 close to the end part. Wherein, fig. 1b shows the state of the biopsy needle before winding up, after winding up and after firing, the outer puncture needle 20 covers the sampling groove 11 on the inner puncture needle. In the sampling process, as shown in fig. 1a, the inner needle 10 is first fired and penetrated into the tissue to be sampled, wherein the sampling slot 11 is immersed in the tissue, and then the outer needle 20 is fired and covers the sampling slot 11, completing the sampling cut.

In the above sampling process, it is desirable that the outer puncture needle is fired again when the inner puncture needle stops moving after firing or is about to stop moving, so as to ensure the success rate of sampling.

The utility model discloses a full-automatic biopsy needle with an in-situ cutting function, which is disclosed in Chinese patent publication No. CN219000373U, wherein an elastic buffer sheet is arranged on a needle core seat, when a trigger key is pressed, as the elastic buffer sheet reduces the distance between an elastic pressing block and an elastic limit strip of the needle core seat, the needle core seat is triggered first, the trigger key is continuously pressed, and the needle tube seat is triggered afterwards. The firing mode of the structure can realize the technical aim of firing the needle core seat and the needle tube seat successively, but the time interval of firing the needle core seat and the needle tube seat successively is greatly influenced by human operation factors. Specifically, if the force of pressing the firing key is small, the interval time is long; if the force of pressing the firing key is large, the interval time is short, and the condition that the outer puncture needle is fired when the inner puncture needle does not reach the designated position easily occurs, namely, the sampling groove is covered by the outer puncture needle when the sampling groove is not completely penetrated into the sampling tissue, so that sampling failure or less sampling quantity is caused.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a firing control mechanism of a biopsy needle and the biopsy needle, wherein the firing control mechanism is not influenced by human operation factors, so that the outer puncture needle is fired again when the inner puncture needle stops moving after being fired or is about to stop moving, and the success rate of sampling is ensured.

In order to solve the technical problems, the technical scheme provided by the utility model is as follows: a firing control mechanism for a biopsy needle, the biopsy needle comprising:

the shell comprises a bottom shell and an upper shell;

the inner puncture needle is fixedly connected to the inner needle sliding block, a first elastic part is arranged on the front surface of the inner needle sliding block, and a first pressing operation surface is arranged on the first elastic part;

the outer puncture needle is fixedly connected to the outer needle sliding block, a second elastic part is arranged on the front surface of the outer needle sliding block, and a second pressing operation surface is arranged on the second elastic part;

the first key is provided with a first pressing convex part used for pressing the first pressing operation surface and a second pressing convex part used for pressing the second pressing operation surface on the inner side of the first key, and in the winding state, the distance between the first pressing convex part and the first pressing operation surface is smaller than the distance between the second pressing convex part and the second pressing operation surface;

the firing control mechanism includes at least:

the blocking part is arranged on one side, close to the outer needle slide block, of the front surface of the inner needle slide block;

the avoidance groove is arranged at the proximal end of the blocking part, and a height drop is formed between the avoidance groove and the blocking part;

the elastic arm, the one end of elastic arm is fixed to be set up, the free end of elastic arm is provided with the convex part towards separation portion one side, and in last string state, the convex part is located between first button and the separation portion, interior pjncture needle is by the back to stop the motion or when just about stopping the motion, the convex part gets into dodge the groove.

In a preferred embodiment, one end of the elastic arm is fixedly connected to the inner side of the upper case.

According to the firing control mechanism of the biopsy needle, when the biopsy needle in the winding state is fired, in the firing process of pressing the first key, firstly the inner needle sliding block (the inner puncture needle) is fired, and as the protruding part is positioned between the first key blocking parts, even if the first key is continuously pressed, the second pressing protruding part still cannot be contacted with the second pressing operation surface. When the inner puncture needle stops moving or is about to stop moving, the position of the avoidance groove corresponds to the position of the convex part, the convex part enters the avoidance groove, and the first key can continuously move down to the position that the second pressing convex part is contacted with the second pressing operation surface and fire the outer needle sliding block (the outer puncture needle).

Compared with the prior art, the firing control mechanism of the biopsy needle of the embodiment has the advantages that the firing interval between the inner puncture needle and the outer puncture needle is not influenced by human operation factors any more, and the outer puncture needle can be fired again when the inner puncture needle stops moving after being fired or is about to stop moving, so that the success rate of sampling is guaranteed.

Drawings

FIG. 1 is a schematic view of an inner needle and an outer needle of the biopsy needle of the present embodiment;

FIG. 2 is a schematic view showing the structure of a biopsy needle according to the present embodiment;

FIG. 3 is a schematic view showing an exploded state structure of the biopsy needle of the present embodiment;

FIG. 4 is a schematic view showing the internal structure of the bottom case in the biopsy needle of the present embodiment;

FIG. 5 is a schematic view showing a combination of a bottom case and a pull rod in the biopsy needle according to the present embodiment;

FIG. 6 is a schematic view showing the front structure of a pull rod in the biopsy needle of the present embodiment;

FIG. 7 is a left side view of the tie rod of FIG. 6;

FIG. 8 is a schematic diagram showing the front structure of the inner needle slider in the present embodiment;

FIG. 9 is a schematic view showing the back structure of the inner needle slider in the present embodiment;

fig. 10 is a schematic diagram showing the front structure of the outer needle slider in the present embodiment;

FIG. 11 is a schematic view showing the back structure of the outer needle slider in the present embodiment;

fig. 12 is a schematic diagram showing a state in which the pull rod drives the outer needle slider and the inner needle slider to sequentially wind up in the present embodiment;

FIG. 13 is a schematic view showing the outer structure of the upper case in the biopsy needle of the present embodiment;

FIG. 14 is a schematic view showing the inner side structure of the upper case in the biopsy needle of the present embodiment;

FIG. 15 is a schematic view showing the structure of the first button, the second button and the inner needle slider in the needle in the winding state;

FIG. 16 is a schematic view showing the structure of the first button and the outer needle slider in the needle in the winding state;

FIG. 17 is a schematic view showing the front structure of the stroke adjusting slider in the biopsy needle of the present embodiment;

FIG. 18 is a schematic view of the back side structure of the travel adjustment slide of FIG. 17;

FIG. 19 is a schematic side elevational view of the travel adjustment slide of FIG. 17;

FIG. 20 is a schematic view showing a partial structure of the biopsy needle of the present embodiment in a cocked state;

FIG. 21 is a schematic view showing a partial structure of the biopsy needle of the present embodiment in a state where the inner needle slider is cocked and the outer needle slider is about to be cocked;

FIG. 22 is a schematic view of a partial structure of the biopsy needle of the present embodiment after the inner needle slide and the outer slide are sequentially fired;

FIG. 23 is a schematic view showing the adjustment of the penetration depth and sampling stroke of the biopsy needle of the present embodiment;

fig. 24 is a schematic view of the inner and outer lancets of the biopsy needle of the present embodiment at different penetration depths and sampling strokes.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "inner", "outer", etc., are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, integrally connected, or detachably connected; may be a communication between the interiors of two elements; may be directly or indirectly through an intermediate medium, and the specific meaning of the terms in the present utility model will be understood by those skilled in the art in specific cases.

In this embodiment, the term "proximal" is the operator end of the biopsy needle and the term "distal" is the patient end of the biopsy needle.

As shown in fig. 2 and 3, the biopsy needle of the present embodiment includes an inner puncture needle 10, an outer puncture needle 20, a housing 30, a pull rod 40, a stroke adjustment mechanism 50, a first key 60, and a second key 70. Wherein, the inner puncture needle 10 is fixedly connected to the inner needle slide block 12, the outer puncture needle 20 is fixedly connected to the outer needle slide block 21, a guiding mechanism 22 is arranged between the proximal end sides of the inner needle slide block 12 and the outer needle slide block 21 and the proximal end side of the shell, and a winding spring 23 is sleeved on the guiding mechanism 22. The inner puncture needle and the inner needle slider, the outer puncture needle and the outer needle slider, the guide mechanism and the winding spring are the same as those in the prior art, and are not described in detail herein.

In this embodiment, the housing 30 includes a bottom shell 31 and an upper shell 32 that are fastened to each other. As a particular feature of the present embodiment, as shown in fig. 3, a pull rod chute 311 with a proximal opening is provided in the bottom case 31 of the present embodiment, and as shown in fig. 4, a pull rod 40 is slidably and fittingly connected to the pull rod chute 311. In the bottom case 31, guide grooves 312 are provided on both sides of the pull rod sliding groove 311, and correspondingly, as shown in fig. 9 and 11, guide protrusions 127 adapted to be connected with the guide grooves 312 are provided on the back surfaces (the side facing the bottom case) of the inner needle slider 12 and the outer needle slider 21, respectively.

In the bottom case 31 of the present embodiment, a spring mounting groove 313 is provided on the proximal end side thereof, and a first spring mounting portion 314 is provided in the spring mounting groove 313.

The pull rod 40 of this embodiment, as shown in fig. 6 and 7, includes a pull rod body 41 that is connected to the pull rod sliding slot 311, and an operation portion 46 that is located outside the housing is provided at a proximal end of the pull rod body 41, and preferably, a pull rod operation hole 461 that accommodates a finger is provided in the operation portion 46. Wherein a swing link 42 is provided on the front face of the distal end of the pull rod body (the side facing the upper case 32), and a gap 47 is provided between the swing link 42 and the pull rod body 41. As a particular feature of this embodiment, the proximal end of the rocker 42 is symmetrically provided with two barbs 43, the opposite inner sides of the barbs 43 having inclined surfaces.

Preferably, in this embodiment, the distal end of the swing link 42 is provided with a swing link fixing portion 45, and the swing link 42 is fixedly connected with the pull rod body 41 through the swing link fixing portion 45.

Preferably, in the present embodiment, the swing link 42 is provided with grooves 441 at both sides thereof at positions close to the swing link fixing portion 45, at which grooves swing deformation portions 44 are formed, and the swing link 42 is swung by deformation at the swing deformation portions 44.

Preferably, in this embodiment, the distal end of the pull rod body 41 is further provided with a second spring mounting portion 48, and as shown in fig. 4, one end of the pull rod spring 401 is connected to the first spring mounting portion 314, and the other end is connected to the second spring mounting portion 48.

The biopsy needle of this embodiment has the following winding principle:

as shown in fig. 8 and 9, the front surface of the inner needle slider 12 is provided with a first elastic portion 121, and the first elastic portion 121 is provided with a first stopper step 122; the side of the inner needle slider 12 facing the outer needle slider 21 is provided with a first hook groove 125 for cooperation with the barb 43 on the swing link 42. Accordingly, as shown in fig. 14, the inner side of the upper case 32 is provided with a first protrusion 321 for being engaged with the first stopper step 122.

As shown in fig. 10 and 11, the front surface of the outer needle slider 21 is provided with a second elastic portion 211, and the second elastic portion 211 is provided with a second stopper step 212; the side of the outer needle slider 21 facing the inner needle slider 12 is provided with a second hook groove 214 for cooperation with the barb 43 on the swing link 42. Accordingly, as shown in fig. 14, the inner side of the upper case 32 is provided with a second protrusion 322 for being engaged with the second stopper step 212.

The winding process is shown in fig. 12, wherein a state a is an un-winding state, in which the pull rod 40 and the corresponding swing rod 42 are at the distal initial position, the inner needle slider 12 and the outer needle slider 21 are also at the distal initial position, and the first hook groove and the second hook groove are arranged in a dislocation manner in the length direction of the pull rod. Preferably, in the present embodiment, in the initial non-winding state, the second hook groove 214 on the outer needle slider 21 is closer to the barb 43 on the swing link 42, the lateral spacing between the first hook groove 125 and the second hook groove 214 is smaller than the maximum spacing between the two barbs 43 on the swing link 42, and both the first hook groove 125 and the second hook groove 214 are located on the travel route of the barb 43.

When the pull rod 40 is pulled in the winding process, as shown in a state b in fig. 12, the barb 43 on the side, close to the outer needle slider, of the swing rod 42 is matched with the second hooking groove 214, so that the swing rod 42 swings towards the side of the outer needle slider, and accordingly the barb 43 on the side, close to the inner needle slider, of the swing rod 42 is staggered with the first hooking groove 125 when the swing rod 42 continues to move proximally until the outer needle slider 21 is pulled to the second stop step 212 by the pull rod 40 to pass over the second convex part 322, and the outer needle slider is limited in the winding state shown in a state c by the second convex part 322.

After the winding of the outer needle slider is completed, the pull rod 40 is released, and the pull rod 40 and the swing rod 42 are restored to the distal end initial position under the restoring force of the pull rod spring 401 as shown in a state d in fig. 12. The pull rod 40 is pulled again, as shown in state e in fig. 12, the barb 43 on the side, close to the inner needle slider, of the swing rod 42 is matched with the first hooking groove 125, so that the swing rod 42 swings to the side of the inner needle slider, and then the inner needle slider is pulled to move proximally until the first stop step 122 passes over the first convex part 321, and the inner needle slider is limited in the winding state shown in state f by the first convex part 321. The pull rod 40 is then released, and the pull rod 40 and the swing link 42 are restored to the distal end initial position by the restoring force of the pull rod spring 401, as shown in state g.

In the prior art, the inner needle slider and the outer needle slider are wound in an operation mode of pressing the winding from the distal end, and the distal end is pressed in a single finger pressing operation, so that the operation is laborious, and the experience is poor for a user. In the embodiment, the pull rod is used for pulling the winding wire at the proximal end, so that the operation is more labor-saving, and the operation experience is better.

The principle of firing control of the biopsy needle of this embodiment is described as follows:

as shown in fig. 8, a first pressing surface 123 is provided on the first elastic portion 121 on the front surface of the inner needle slider, and as shown in fig. 10, a second pressing surface 213 is provided on the second elastic portion 211 on the front surface of the outer needle slider. Accordingly, as shown in fig. 14 to 16, the first pressing convex portion 61 for pressing the first pressing operation surface 123 and the second pressing convex portion 62 for pressing the second pressing operation surface 213 are provided on the inner side of the first key 60, and further, the third pressing convex portion 71 for pressing the first pressing operation surface 123 is provided on the inner side of the second key 70. In the winding state, the distance between the first pressing protrusion 61 and the first pressing operation surface 123 is smaller than the distance between the second pressing protrusion 62 and the second pressing operation surface 213.

The biopsy needle of this embodiment has two firing control modes, the first firing control mode is to press the first key 60, because the distance between the first pressing convex portion 61 and the first pressing operation surface 123 is smaller than the distance between the second pressing convex portion 62 and the second pressing operation surface 213, the first pressing convex portion 61 and the first pressing operation surface 123 are in contact first, and the first elastic portion 121 is driven to deform until the first stop step 122 is lower than the first convex portion 321, so that the limit of the inner needle slider is released, and the firing of the inner needle slider is realized. The first key 60 is continuously pressed until the second pressing convex part 62 contacts with the second pressing operation surface 213, so that the second elastic part 211 is driven to deform until the second stop step 212 is lower than the second convex part 322, and therefore the limit of the outer needle slider is released, and the firing of the outer needle slider is realized.

The second firing control manner of this embodiment is to press the second key 70 first, so that the third pressing protrusion 71 contacts the first pressing operation surface 123, and drive the first elastic portion 121 to deform until the first stop step 122 is lower than the first protrusion 321, thereby releasing the limit on the inner needle slider and realizing firing of the inner needle slider. Then, the first key 60 is pressed, so that the second pressing convex portion 62 contacts with the second pressing operation surface 213, and the second elastic portion 211 is driven to deform until the second stop step 212 is lower than the second convex portion 322, thereby releasing the limit of the outer needle slider and realizing the firing of the outer needle slider.

As described in the background art, in the first firing control method, the interval between the firing of the inner needle slider and the outer needle slider is related to the operation habit of the operator, such as the pressing force and the pressing speed. As a particular feature of this embodiment, a firing control mechanism is specifically provided to ensure that the outer lancet is fired again when the inner lancet stops moving after firing or is about to stop moving, as described in more detail below.

As shown in fig. 8, a blocking portion 124 is disposed on one side of the front surface of the inner needle slider 12 close to the outer needle slider, an avoidance groove 1241 is disposed at the proximal end of the blocking portion 124, and a height difference is formed between the blocking portion 124 and the avoidance groove 1241 and a step 1242 is formed.

As shown in fig. 17 to 19, the stroke adjustment mechanism 50 of the present embodiment includes an adjustment slider 53, the distal end of which adjustment slider 53 is provided with a resilient arm 54, and the free end of which resilient arm 54 is provided with a projection 55 facing the blocking portion 124 side.

In this embodiment, the blocking portion 124, the escape groove 1241, the elastic arm 54, and the protrusion 55 constitute the firing control mechanism of this embodiment. As shown in fig. 20, in the cocked state, the protrusion 55 is located between the first button 60 and the blocking portion 124, and during the firing process of pressing the first button 60, first the inner needle slider (inner puncture needle) is fired, and since the protrusion 55 is located between the first button 60 and the blocking portion 124, the second pressing protrusion 62 is still not in contact with the second pressing operation surface 213 even if the first button 60 is continuously pressed. Until the inner puncture needle stops moving or is about to stop moving, the position of the avoidance groove 1241 corresponds to the position of the protrusion 55, as shown in fig. 21, the protrusion 55 enters the avoidance groove 1241, so that the first key 60 can continue to descend until the second pressing protrusion 62 contacts the second pressing operation surface 213 and fires the outer needle slider (outer puncture needle), and the outer needle slider is in a fired state as shown in fig. 22.

In this embodiment, by setting the firing control mechanism, the firing interval between the inner puncture needle and the outer puncture needle is no longer affected by human operation factors, so that the inner puncture needle can be ensured to stop moving after being fired or be fired when moving is about to stop, and the outer puncture needle is ensured to be fired again, thereby ensuring the success rate of sampling.

The provision of the elastic arm 54 and the protruding portion 55 on the adjustment slider 53 is a preferred embodiment of the present embodiment, and is not limited to the position thereof. As an equivalent embodiment of the present embodiment, the elastic arm 54 and the convex portion 55 may be provided inside the upper case 32.

The stroke adjusting mechanism 50 of this embodiment includes an adjusting slider 53 capable of moving transversely relative to the housing 30 and an adjusting dial 51 fixedly connected to the adjusting slider 53, wherein the adjusting slider 53 is located inside the housing, as shown in fig. 13-14, a transverse groove 323 is provided on the upper housing 32, as shown in fig. 2, the adjusting dial 51 is located outside the housing, a portion of the adjusting dial 51 extends into the transverse groove 323 and then is fixedly connected to the adjusting slider 53, and a stroke mark 52 is provided on the upper housing 32 at a position close to the transverse groove 323.

As shown in fig. 17, in the present embodiment, the front surface of the adjustment slider 53 is provided with a connecting portion 56 for connecting with the adjustment dial 51. Preferably, the proximal end side of the connecting portion 56 is provided with a plurality of stopper recesses 57 laterally spaced apart. Accordingly, as shown in fig. 13 to 14, the proximal end side of the lateral groove 323 is provided with a cantilever 324, and the free end of the cantilever 324 is provided with a stopper protrusion 325 for fitting with the stopper recess 57. Wherein, the number of the limit concave parts 57 is consistent with and corresponds to the number of the gears of the adjustable stroke one by one. Preferably, in this embodiment, there are three gears, and the number of the limit recesses 57 is three.

In the present embodiment, a lateral guide mechanism is provided between the adjustment slider 53 and the housing 30. Preferably, in the present embodiment, as shown in fig. 14 and 17, the lateral guide mechanism includes a lateral guide rail 326 provided on the inner side of the upper case 32 and a lateral guide groove 58 provided on the front surface of the adjustment slider 53.

As shown in fig. 18, in this embodiment, the back surface of the adjusting slider 53 is provided with a pair of first and second limiting walls 531 and 532 disposed opposite to each other, and proximal ends of the first and second limiting walls 531 and 532 are provided with limiting surfaces 533 for respectively abutting and mating with distal end surfaces of the inner and outer needle sliders.

As shown in fig. 9, in this embodiment, the distal end surface of the inner needle slider 12 is provided with a first limit step 126 for abutting engagement with the limit surface 533 of the second limit wall 532. Preferably, in this embodiment, the first limiting step 126 includes three limiting steps distributed in a transverse direction, which are a first step 1261, a second step 1262, and a third step 1263.

As shown in fig. 10 and 11, in the present embodiment, the distal end surface of the outer needle slider 21 is provided with a second limiting step 215 for abutting and matching with the limiting surface 533 of the first limiting wall 531. Preferably, in this embodiment, the second limiting step 215 includes three limiting steps distributed in a transverse direction, which are a fourth step 2151, a fifth step 2152, and a sixth step 2153.

In this embodiment, the stroke-adjustable gears are three gears, and accordingly, three limit steps are respectively provided on the distal end surfaces of the inner needle slider 12 and the outer needle slider 21. Those skilled in the art will recognize that if other numbers of gears are required, the number of limit steps is identical to the number of gears.

The biopsy needle of this embodiment, wherein the stroke adjustment principle is shown in fig. 23, wherein in state a, the inner needle slider and the outer needle slider are in a cocked state, in which the adjustment dial 51 is operable by lateral toggling to adjust and select the corresponding gear.

In the present embodiment, in the state b of fig. 23, the first and second stopper walls 531 and 532 correspond to the fourth and first steps 2151 and 1261, respectively. The puncture depth and the sampling stroke corresponding to the state b are shown as a stroke a in fig. 24, wherein a1 is in an unchorded state, a2 is in a chorded state, a3 is in an inner puncture needle firing state, wherein the position of the inner puncture needle in the a3 state is the same as that of the inner puncture needle in the unchorded state after being fired, namely the puncture depth of the inner puncture needle is in the longest state, the sampling stroke is L1, and the sampling stroke L1 is the whole length of a sampling groove; the a4 state is a state that the outer puncture needle covers the sampling groove after being triggered.

In the present embodiment, in the state c of fig. 23, the first and second stopper walls 531 and 532 correspond to the fifth and second steps 2152 and 1262, respectively. The penetration depth and sampling stroke corresponding to the state c are shown as a stroke b in fig. 24, wherein b1 is in an unwinding state, b2 is in an winding state, and b3 is in an inner puncture needle firing state. After the internal puncture needle in the state b3 is triggered, the internal puncture needle does not move to a position in an unreturned state, namely, the puncture depth of the internal puncture needle is smaller than that in the state a3, the sampling groove is not fully exposed, the sampling stroke is L2, and the sampling stroke L2 is smaller than the length of the sampling groove. And the state b4 is a state that the outer puncture needle covers the sampling groove after being triggered.

In the present embodiment, in the state d of fig. 23, the first and second stopper walls 531 and 532 correspond to the sixth and third steps 2153 and 1263, respectively. The penetration depth and sampling stroke corresponding to the state d are shown as a stroke c in fig. 24, wherein c1 is in an unwinding state, c2 is in an winding state, and c3 is in an inner puncture needle firing state. After the internal puncture needle in the c3 state is triggered, the puncture depth is smaller than that in the b3 state, the sampling stroke L3 of the sampling groove is smaller than that of the sampling stroke L2 in the b3 state, and the c4 state is a state that the external puncture needle covers the sampling groove after being triggered.

As described above, compared with the prior art in which the sampling stroke is adjusted by adjusting the winding position, the stroke adjusting mechanism of the embodiment has the advantages that the winding position of the winding mechanism is not required to be adjusted, the structure is simpler and more reliable, and the cost is lower. In addition, the stroke adjusting mechanism of the embodiment can adapt to the puncture sampling of more tissues by synchronously adjusting the puncture depth and the sampling stroke, and has wider application range and more flexible use.

As shown in fig. 8, in different stroke steps, the positions of the step 1242 between the blocking portion 124 and the avoidance groove 1241 are different and correspond to the positions of the first step 1261, the second step 1262 and the third step 1263, respectively, so as to ensure that the firing intervals between the inner needle slider and the outer needle slider are consistent in each stroke step.

In summary, the foregoing description is only of the preferred embodiments of the utility model, and is not intended to limit the utility model to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the utility model.

Claims (10)

1. A firing control mechanism for a biopsy needle, the biopsy needle comprising:

a housing (30) comprising a bottom shell (31) and an upper shell (32);

an inner puncture needle (10) fixedly connected to an inner needle slider (12), wherein a first elastic part (121) is arranged on the front surface of the inner needle slider, and a first pressing operation surface (123) is arranged on the first elastic part;

an outer puncture needle (20) fixedly connected to an outer needle slider (21), wherein a second elastic part (211) is arranged on the front surface of the outer needle slider, and a second pressing operation surface (213) is arranged on the second elastic part;

a first key (60), wherein a first pressing convex part (61) for pressing a first pressing operation surface and a second pressing convex part (62) for pressing a second pressing operation surface are arranged on the inner side of the first key, and in the winding state, the distance between the first pressing convex part and the first pressing operation surface is smaller than the distance between the second pressing convex part and the second pressing operation surface;

the firing control mechanism is characterized by at least comprising:

a blocking part (124) which is arranged on one side of the front surface of the inner needle sliding block, which is close to the outer needle sliding block;

the avoidance groove (1241) is arranged at the proximal end of the blocking part, and a height drop is formed between the avoidance groove and the blocking part;

the elastic arm (54), the one end of elastic arm is fixed to be set up, the free end of elastic arm is provided with convex part (55) towards separation portion one side, and in last string state, the convex part is located between first button and the separation portion, the inner puncture needle is by the back to stop the motion or when just stopping the motion, the convex part gets into dodge the groove.

2. The firing control mechanism of claim 1, wherein one end of the resilient arm is fixedly coupled to an inner side of the upper housing.

3. A biopsy needle, characterized in that it comprises at least the firing control mechanism of claim 1, a first stop step (122) is provided on the first elastic part, and a first protrusion (321) for matching with the first stop step is provided on the inner side of the upper case; the second elastic part is provided with a second stop step (212), and the inner side of the upper shell is provided with a second convex part (322) matched with the second stop step.

4. A biopsy needle according to claim 3, further comprising a stroke adjustment mechanism (50) comprising at least an adjustment slider (53) movable laterally relative to the housing, the back of the adjustment slider being provided with a pair of oppositely arranged first and second stop walls (531, 532), the proximal ends of the first and second stop walls being provided with stop surfaces (533) for abutting engagement with the distal end surfaces of the inner and outer needle sliders, respectively.

5. The biopsy needle of claim 4, wherein the distal end face of the inner needle slider is provided with a first limiting step for abutting engagement with the limiting surface of the second limiting wall, the first limiting step comprising at least two limiting steps distributed in a lateral direction; the distal end face of the outer needle sliding block is provided with a second limiting step which is used for being in butt fit with the limiting face of the first limiting wall, and the second limiting step comprises at least two limiting steps which are distributed transversely.

6. The biopsy needle of claim 4, wherein a lateral guide mechanism is disposed between the adjustment slider and the housing, the lateral guide mechanism comprising a lateral guide rail disposed inside the upper housing and a lateral guide slot disposed on a front face of the adjustment slider.

7. The biopsy needle of claim 4, further comprising an adjustment dial (51) fixedly coupled to the adjustment slider, the adjustment dial being located outside of the housing.

8. The biopsy needle of claim 7, wherein the upper housing is provided with a transverse slot, wherein a portion of the adjustment dial block extends into the transverse slot and is fixedly connected with the adjustment slide, and wherein a travel marker is provided on the upper housing at a position adjacent to the transverse slot.

9. The biopsy needle of claim 8, wherein the front face of the adjustment slider is provided with a connecting portion for connecting with an adjustment dial, and the proximal side of the connecting portion is provided with at least two limit recesses laterally spaced apart; the proximal side of the transverse groove is provided with a cantilever, and the free end of the cantilever is provided with a limit convex part which is used for being matched with the limit concave part.

10. Biopsy needle according to any of claims 4-9, wherein one end of the resilient arm is fixedly connected to the proximal side of the adjustment slider.