End cutting biopsy gun

Abstract

An end-cutting biopsy gun includes an outer sleeve assembly, a cutting tube assembly, an inner core needle and a handle assembly, wherein the outer sleeve assembly includes an outer sleeve and an outer sleeve fixing part, the cutting tube assembly includes a cutting tube and a cutting tube fixing part, the inner core needle is fixedly mounted on the handle assembly, an upper shell and a lower shell constitute an inner cavity of the handle, a first step is arranged in the inner cavity of the handle, a slide groove is arranged in the inner cavity of the handle for the cutting tube fixing part to drive the outer sleeve fixing part to move forward and backward, and a push handle is arranged on the outer side of the inner cavity of the handle. Compared with the prior art, the cutting space of the present invention is a cylindrical cutting groove, and the amount of tissue removed at one time is equivalent to more than twice the amount of the traditional semicircular cutting groove, and the amount removed is thicker, ensuring the accuracy of case analysis; in addition, the sampling length of the cylindrical cutting groove can be achieved by adjusting the gear part, and the doctor can adjust the amount of tissue removed according to the needs, thereby realizing quantitative sampling; the present invention realizes one-button firing, and is easy to operate.

Description

Technical Field

[0001] The invention relates to the technical field of medical equipment, in particular to an end-cutting biopsy gun. Background Art

[0002] A tumor is a lesion formed when a cell in a local tissue loses normal growth regulation at the genetic level under the action of various carcinogenic factors, leading to its clonal abnormal proliferation. It is generally divided into two categories: benign and malignant.

[0003] Early detection, correct diagnosis, and timely treatment have an important impact on prognosis. With the continuous upgrading and improvement of examination means and methods, the accuracy of diagnosis has gradually increased, but there are still a large number of tumors that do not have typical imaging characteristics and are difficult to diagnose. Correct diagnosis requires a combination of clinical, imaging, and pathology. Among them, pathological diagnosis plays a key role in the selection of treatment options. Puncture biopsy is the main way to obtain pathological diagnosis.

[0004] At present, the biopsy needle mainly includes an outer tube needle, an inner core needle, and the inner core needle is provided with a sampling groove. The outer tube needle is sleeved on the outside of the inner core needle and installed together on the needle holder. The specimen is obtained by a controllable ejection device. When in use, when percutaneously puncturing to the sampling site under image monitoring, the inner core needle is inserted first so that the sampling groove is located at the lesion, and then the ejection device ejects the outer tube needle, and the outer tube needle rushes forward to cut the tissue of the lesion site in the sampling groove of the inner core needle. The sampling specimen can be obtained by pulling out the biopsy needle.

[0005] Traditional biopsy needles cut into semicircular cutting grooves. Since the cutting grooves are set on the inner core needle with a smaller inner diameter, the space for tissue after cutting is small. Sometimes, the amount of tissue taken in one biopsy is difficult to reach the effective case analysis amount, and another sample is needed, causing secondary pain to the patient and reducing the effectiveness of the biopsy needle. Summary of the invention

[0006] In view of the above defects in the prior art, the present invention provides an end-cutting biopsy gun as follows:

[0007] The technical solution of the present invention is achieved in this way:

[0008] An end-cutting biopsy gun comprises an outer sleeve assembly, a cutting tube assembly, an inner core needle and a handle assembly, wherein the outer sleeve assembly comprises an outer sleeve and an outer sleeve fixing piece, wherein the outer sleeve is fixedly mounted on the outer sleeve fixing piece, the cutting tube assembly comprises a cutting tube and a cutting tube fixing piece, wherein the cutting tube is fixedly mounted on the cutting tube fixing piece, the handle assembly comprises an upper shell and a lower shell, wherein the inner core needle is fixedly mounted on the handle assembly, the outer sleeve is sleeved on the outer periphery of the cutting tube, wherein the cutting tube is sleeved on the outer periphery of the inner core needle, the upper shell and the lower shell constitute an inner cavity of the handle, wherein a first step is arranged in the inner cavity of the handle, wherein a slide groove is arranged in the inner cavity of the handle for driving the outer sleeve fixing piece to move forward and backward, and a push handle is arranged on the outer side of the inner cavity of the handle,

[0009] The cutting tube fixing piece is provided with a through hole in the axial direction for fixing and installing the cutting tube, the rear end of the cutting tube fixing piece is abutted against the rear end of the handle inner cavity through a spring, the front end of the cutting tube fixing piece is provided with a bayonet, the rear end of the cutting tube fixing piece is provided with a barb that can be hung with the first step when it is at the rearmost end of the handle inner cavity, and the second step is provided on the outer side of the middle end of the cutting tube fixing piece;

[0010] The push handle comprises a push handle body, the inner front end of the push handle body is provided with a third step which can pull the cutting tube fixing piece backward when it abuts against the second step, and the inner rear end of the push handle body is provided with a fourth step which can push the barb out of the hanging position with the first step when the push handle is pushed, so that the cutting tube fixing piece is in a firing state;

[0011] The outer sleeve fixing piece is provided with a channel for fixing and installing the outer sleeve in the axial direction, the rear end of the outer sleeve fixing piece is provided with a fifth step which can be placed in the bayonet, the bayonet is provided with a forward and backward moving space for the fifth step, the forward and backward moving space is greater than or equal to the cutting distance, the middle part of the outer sleeve fixing piece is provided with a limiter abutting against the front end of the bayonet, when the cutting tube fixing piece is fired and moved forward, the outer sleeve fixing piece is driven to move forward, the limiter is released from abutting against the front end of the bayonet when the outer sleeve fixing piece reaches the front end, and the cutting tube fixing piece continues to move forward a cutting distance to the front end of the inner cavity of the handle;

[0012] A front groove and a rear groove are arranged on the outer side of the front end of the outer sleeve, and an arc-shaped cutting knife is arranged on the front end of the cutting tube. During puncture, the front end of the arc-shaped cutting knife extends out from the rear groove and abuts against the surface of the front groove; when the outer sleeve is filled with tissue, the outer sleeve and the cutting tube are fired and moved forward, so that a cutting cavity is formed at the front end of the outer sleeve, and the tissue is filled in the cutting cavity; when the cutting tube cuts the tissue, the limit piece of the outer sleeve is released from the abutment with the front end of the bayonet, and the cutting tube moves forward by itself for a cutting distance, and the front end of the arc-shaped cutting knife enters the cutting cavity from the surface of the front groove to cut the tissue.

[0013] Preferably, a shift piece is provided at the front end of the inner cavity of the handle, the front end of the shift piece is an externally threaded rod, and the rear end is used to abut the cutting tube fixing piece and the outer sleeve fixing piece to limit the firing position. A rotating piece is provided on the outside of the front end of the inner cavity of the handle, and an internal thread matching the externally threaded rod is provided on the inner side of the rotating piece. Rotating the rotating piece causes the externally threaded rod to move forward and backward.

[0014] Preferably, the rear end of the externally threaded rod is provided with upper and lower chamfers for releasing the limiter from abutting against the front end of the bayonet, and a limiter sinking slope is provided between the upper and lower chamfers.

[0015] Preferably, the front end of the spring is sleeved on the cutting tube fixing piece, the rear end of the spring supports the rear ends of the upper shell and the lower shell, and the spring is entirely sleeved on the periphery of the inner core needle.

[0016] Preferably, the push handle body is sleeved on the outer surfaces of the upper shell and the lower shell, and an anti-slip push belt is provided on the outer side of the push handle body.

[0017] Preferably, the needle head of the inner core needle is a triangular needle head.

[0018] Preferably, the biopsy gun further comprises a safety lock, which is sleeved on the outer surfaces of the upper shell and the lower shell. The safety lock abuts against the push handle when in the initial position, and is released from abutting against the push handle when the safety lock is pushed forward.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The end-cutting biopsy gun of the present invention has a cylindrical cutting groove in which the cutting space is formed. The amount of tissue removed at one time is equivalent to more than twice the amount of tissue removed by a traditional semicircular cutting groove, and the amount removed is thicker, thereby ensuring the accuracy of case analysis. In addition, the sampling length of the cylindrical cutting groove can be achieved by adjusting the gear part, and the doctor can adjust the amount of tissue removed according to needs, thereby realizing quantitative sampling. The present invention realizes one-button firing and is simple to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the end-cutting biopsy gun of the present invention;

[0022] Figure 2 It is a schematic diagram of the structure of the end-cutting biopsy gun of the present invention (the inner cavity of the handle is disassembled);

[0023] Figure 3 It is a schematic diagram of the connection structure of the outer sleeve fixing part, the cutting tube fixing part and the shifting part of the present invention;

[0024] Figure 4 It is a schematic structural diagram of the cutting tube fixing member of the present invention;

[0025] Figure 5 It is a schematic diagram of the structure of the push handle of the present invention;

[0026] Figure 6 It is a structural schematic diagram of the outer sleeve fixing member of the present invention;

[0027] Figure 7 for Figure 6 Stereoscopic image of

[0028] Figure 8 for Figure 6 Left view (the stopper has not sunk);

[0029] Fig. 9 for Figure 6 Left view (limiting part sinks);

[0030] Fig.10 It is a structural schematic diagram of the shift member of the present invention;

[0031] Fig.11 for Fig.10 Stereoscopic image of

[0032] Fig.12 It is a structural schematic diagram of the outer sleeve of the present invention;

[0033] Fig.13 It is a schematic diagram of the structure of the cutting tube of the present invention;

[0034] Fig.14 It is a structural schematic diagram of the inner core needle of the present invention;

[0035] Fig.15 It is an axial cross-sectional view (initial state) of the end-cutting biopsy gun of the present invention;

[0036] Fig.16 for Fig.15 Enlarged view of part A in the middle;

[0037] Fig.17 The figure is an axial cross-sectional view of the end-cutting biopsy gun of the present invention (puncture process state);

[0038] Fig.18 It is an axial cross-sectional view of the end-cutting biopsy gun of the present invention (in the state of being ready to fire);

[0039] Fig.19 It is an axial cross-sectional view of the end-cutting biopsy gun of the present invention (firing state).

[0040] In the figure: outer sleeve 110, front groove 111, rear groove 112, outer sleeve fixing part 120, channel 130, fifth step 140, limit part 150, cutting tube 210, arc cutter 211, rear groove 112, cutting tube fixing part 220, through hole 230, bayonet 240, barb 250, second step 260, front and rear moving space 270, inner core needle 300, upper shell 310, lower shell 320, first step 410, push handle 500, push handle body 510, third step 520, fourth step 530, anti-slip push belt 540, spring 600, gear part 810, external threaded rod 820, rotating part 830, upper and lower chamfers 840, limit part sinking slope 850, safety lock 900. DETAILED DESCRIPTION

[0041] The present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0042] like Figure 1 , Figure 2 , Figure 3 , Fig.13 , Fig.14 As shown, an end-cutting biopsy gun comprises an outer sleeve assembly, a cutting tube assembly, an inner core needle and a handle assembly, wherein the outer sleeve assembly comprises an outer sleeve 110 and an outer sleeve fixing part 120, wherein the outer sleeve 110 is fixedly mounted on the outer sleeve fixing part 120, the cutting tube assembly comprises a cutting tube 210 and a cutting tube fixing part 220, wherein the cutting tube 210 is fixedly mounted on the cutting tube fixing part 220, the handle assembly comprises an upper shell 310 and a lower shell 320, the inner core needle 300 is fixedly mounted on the handle assembly, the outer sleeve 110 is sleeved on the outer periphery of the cutting tube 210, wherein the cutting tube 210 is sleeved on the outer periphery of the inner core needle 300, the upper shell 310 and the lower shell 320 constitute an inner cavity of the handle, a first step 410 is arranged in the inner cavity of the handle, a sliding groove for driving the cutting tube fixing part 220 to drive the outer sleeve fixing part 120 to move forward and backward is arranged in the inner cavity of the handle, a push handle 500 is arranged on the outer side of the inner cavity of the handle,

[0043] like Figure 4 As shown, the cutting tube fixing part 220 is provided with a through hole 230 in the axial direction for fixing and installing the cutting tube 210, the rear end of the cutting tube fixing part 220 is in contact with the rear end of the inner cavity of the handle through a spring 600, the front end of the cutting tube fixing part 220 is provided with a bayonet 240, the bayonet 240 is used to connect with the outer sleeve assembly, the rear end of the cutting tube fixing part 220 is provided with a barb 250 which can be hung with the first step 410 when it is at the rear end of the inner cavity of the handle, and the outer side of the middle end of the cutting tube fixing part 220 is provided with a second step 260;

[0044] like Figure 5As shown, the push handle 500 includes a push handle body 510, and the push handle body 510 may be semi-arc-shaped. The inner front end of the push handle body 510 is provided with a third step 520 that can pull the cutting tube fixing member 220 to move backward when it abuts against the second step 260. The inner rear end of the push handle body 510 is provided with a fourth step 530 that can push the barb 250 out of the hanging position with the first step 410 when the push handle 500 is pushed, so that the cutting tube fixing member 220 is in a firing state.

[0045] like Figure 6-9 As shown, the outer sleeve fixing part 120 is provided with a channel 130 for fixing and installing the outer sleeve 110 in the axial direction, and the rear end of the outer sleeve fixing part 120 is provided with a fifth step 140 which can be placed in the bayonet 240, and the bayonet 240 is provided with a front-to-back moving space 270 for the fifth step 140, and the front-to-back moving space 270 is greater than or equal to the cutting distance, and the middle part of the outer sleeve fixing part 120 is provided with a limiter 150 which abuts against the front end of the bayonet 240, and when the cutting tube fixing part 220 moves forward by firing, the outer sleeve fixing part 120 is driven to move forward, and the limiter 150 is released from abutting against the front end of the bayonet 240 when the outer sleeve fixing part 120 moves to the front end, and the cutting tube fixing part 220 continues to move forward a cutting distance to the front end of the inner cavity of the handle;

[0046] like Fig.12 As shown, a front groove 111 and a rear groove 112 are arranged on the outer side of the front end of the outer sleeve 110, and an arc-shaped cutting knife 211 is arranged on the front end of the cutting tube 210. During puncture, the front end of the arc-shaped cutting knife 211 extends out from the rear groove 112 and abuts against the surface of the front groove 111; when the outer sleeve 110 is filled with tissue, the outer sleeve 110 and the cutting tube 210 are fired and moved forward, so that a cutting cavity is formed at the front end of the outer sleeve 110, and the tissue is filled in the cutting cavity; when the cutting tube 210 cuts the tissue, the limiter 150 of the outer sleeve 110 is released from the abutment with the front end of the bayonet 240, and the cutting tube 210 moves forward by itself for a cutting distance, and the front end of the arc-shaped cutting knife 211 enters the cutting cavity from the surface of the front groove 111 to cut the tissue.

[0047] like Fig.10 , Fig.11 As shown, a shift member 810 is provided at the front end of the inner cavity of the handle, and the front end of the shift member 810 is an externally threaded rod 820, and the rear end is used to abut the cutting tube fixing member 220 and the outer sleeve fixing member 120 for firing limit. A rotating member 830 is provided on the outside of the front end of the inner cavity of the handle, and an internal thread matching the externally threaded rod 820 is provided on the inner side of the rotating member 830. Rotating the rotating member 830 allows the externally threaded rod 820 to move forward and backward, thereby adjusting the front and rear positions that the cutting tube fixing member 220 and the outer sleeve fixing member 120 can reach when firing, and then adjusting the cutting length of the tissue.

[0048] The rear end of the external threaded rod 820 is provided with upper and lower chamfers 840 for releasing the limit member 150 from abutting against the front end of the bayonet 240, and a limit member sinking slope 850 is provided between the upper and lower chamfers 840. When firing, the cutting tube fixing member 220 drives the outer tube fixing member 120 forward. When the limit member 150 on the outer tube fixing member 120 touches the upper and lower chamfers 840, the limit member 150 sinks, thereby releasing the connection between the outer tube fixing member 120 and the cutting tube fixing member 220. At this time, the outer tube fixing member 120 stops moving, and the spring 600 continues to push the cutting tube fixing member 220 forward a cutting distance, so that the arc-shaped cutting knife 211 performs tissue cutting.

[0049] The front end of the spring 600 is sleeved on the cutting tube fixing piece 220 , and the rear end of the spring 600 is against the rear ends of the upper shell 310 and the lower shell 320 . The spring 600 is entirely sleeved on the periphery of the inner core needle 300 .

[0050] The push handle body 510 is mounted on the outer surfaces of the upper shell 310 and the lower shell 320 , and an anti-slip push belt 540 is disposed on the outer side of the push handle body 510 .

[0051] The needle head of the inner core needle 300 is a triangular needle head.

[0052] The biopsy gun also includes a safety lock 900, which is mounted on the outer surfaces of the upper shell 310 and the lower shell 320. The safety lock 900 abuts against the push handle 500 in the initial position. When the safety lock 900 is pushed forward, the safety lock 900 is released from abutting against the push handle 500, so that the push handle 500 is in a working state.

[0053] Working process of the present invention:

[0054] Initial state, such as Fig.15 , Fig.16 As shown, the inner core needle 300 is retracted into the outer sleeve, and the push handle 500 is pulled back, and the push handle 500 drives the cutting tube fixing member 220 to move backward, and the cutting tube fixing member 220 drives the outer sleeve fixing member 120 to move backward at the same time, until the cutting tube fixing member 220 is hooked on the first step 410 of the upper shell 310 and the lower shell 320;

[0055] Gear, such as Fig.17 As shown, when entering the puncture state, percutaneous puncture can be performed;

[0056] like Fig.18 , Fig.19As shown, the push handle 500 moves forward, causing the cutting tube fixing member 220 to be unhooked from the first step 410, thereby driving the outer sleeve fixing member 210 to move forward together. At this time, the cutting tube 210 and the outer sleeve 110 move forward together and are inserted into the tissue. The inner cavity of the cutting tube 210 will be filled with cylindrical tissue strips until the limit member 150 of the outer sleeve fixing member 120 touches the upper and lower chamfers 840. At this time, the limit member 150 sinks along the limit member sinking slope 850, so that the outer sleeve fixing member 120 is disengaged from the cutting tube fixing member 220, so that the cutting tube fixing member 220 continues to move forward under the action of the spring 600, driving the cutting tube 210 forward, thereby completing the cutting of the tissue.

[0057] Based on the structure of the end-cutting biopsy gun of the present invention, it can be seen that the cutting space is a cylindrical cutting groove, and the amount of tissue removed at one time is equivalent to more than twice the amount of the traditional semicircular cutting groove, and the amount removed is thicker, ensuring the accuracy of case analysis; in addition, the sampling length of the cylindrical cutting groove can be achieved by adjusting the gear part, and the doctor can adjust the amount of tissue removed according to needs, thereby realizing quantitative sampling; the present invention can achieve one-button firing and is simple to operate.

Claims

1. An end-cutting biopsy gun, characterized in that: The invention comprises an outer sleeve assembly, a cutting tube assembly, an inner core needle and a handle assembly, wherein the outer sleeve assembly comprises an outer sleeve and an outer sleeve fixing part, the outer sleeve is fixedly mounted on the outer sleeve fixing part, the cutting tube assembly comprises a cutting tube and a cutting tube fixing part, the cutting tube is fixedly mounted on the cutting tube fixing part, the handle assembly comprises an upper shell and a lower shell, the inner core needle is fixedly mounted on the handle assembly, the outer sleeve is sleeved on the outer periphery of the cutting tube, the cutting tube is sleeved on the outer periphery of the inner core needle, the upper shell and the lower shell constitute an inner cavity of the handle, a first step is arranged in the inner cavity of the handle, a sliding groove is arranged in the inner cavity of the handle for driving the outer sleeve fixing part to move forward and backward, a push handle is arranged on the outer side of the inner cavity of the handle, The cutting tube fixing piece is provided with a through hole in the axial direction for fixing and installing the cutting tube, the rear end of the cutting tube fixing piece is abutted against the rear end of the handle inner cavity through a spring, the front end of the cutting tube fixing piece is provided with a bayonet, the rear end of the cutting tube fixing piece is provided with a barb that can be hung with the first step when it is at the rearmost end of the handle inner cavity, and the second step is provided on the outer side of the middle end of the cutting tube fixing piece; The push handle comprises a push handle body, the inner front end of the push handle body is provided with a third step which can pull the cutting tube fixing piece backward when it abuts against the second step, and the inner rear end of the push handle body is provided with a fourth step which can push the barb out of the hanging position with the first step when the push handle is pushed, so that the cutting tube fixing piece is in a firing state; The outer sleeve fixing piece is provided with a channel for fixing and installing the outer sleeve in the axial direction, the rear end of the outer sleeve fixing piece is provided with a fifth step which can be placed in the bayonet, the bayonet is provided with a forward and backward moving space for the fifth step, the forward and backward moving space is greater than or equal to the cutting distance, the middle part of the outer sleeve fixing piece is provided with a limiter abutting against the front end of the bayonet, when the cutting tube fixing piece is fired and moved forward, the outer sleeve fixing piece is driven to move forward, the limiter is released from abutting against the front end of the bayonet when the outer sleeve fixing piece reaches the front end, and the cutting tube fixing piece continues to move forward a cutting distance to the front end of the inner cavity of the handle; A front groove and a rear groove are arranged on the outer side of the front end of the outer sleeve, and an arc-shaped cutting knife is arranged on the front end of the cutting tube. During puncture, the front end of the arc-shaped cutting knife extends out from the rear groove and abuts against the surface of the front groove; when the outer sleeve is filled with tissue, the outer sleeve and the cutting tube are fired and moved forward, so that a cutting cavity is formed at the front end of the outer sleeve, and the tissue is filled in the cutting cavity; when the cutting tube cuts the tissue, the limit piece of the outer sleeve is released from the abutment with the front end of the bayonet, and the cutting tube moves forward by itself for a cutting distance, and the front end of the arc-shaped cutting knife enters the cutting cavity from the surface of the front groove to cut the tissue.

2. The end cutting biopsy gun according to claim 1, characterized in that: A shift piece is provided at the front end of the inner cavity of the handle, and the front end of the shift piece is an externally threaded rod, and the rear end is used to abut the cutting tube fixing piece and the outer sleeve fixing piece to limit the firing position. A rotating piece is provided on the outside of the front end of the inner cavity of the handle, and an internal thread matching the externally threaded rod is provided on the inner side of the rotating piece. Rotating the rotating piece makes the externally threaded rod move forward and backward.

3. The end cutting biopsy gun according to claim 2, characterized in that: The rear end of the external threaded rod is provided with upper and lower chamfers for releasing the limiter from abutting against the front end of the bayonet, and a limiter sinking slope is provided between the upper and lower chamfers.

4. The end-cutting biopsy gun according to claim 3, characterized in that: The front end of the spring is sleeved on the cutting tube fixing piece, the rear end of the spring supports the rear ends of the upper shell and the lower shell, and the spring is sleeved on the outer periphery of the inner core needle as a whole.

5. The end-cutting biopsy gun according to claim 4, characterized in that: The push handle body is sleeved on the outer surfaces of the upper shell and the lower shell, and an anti-skid push belt is arranged on the outer side of the push handle body.

6. The end-cutting biopsy gun according to claim 5, characterized in that: The needle head of the inner core needle is a triangular needle head.

7. The end-cutting biopsy gun according to any one of claims 1 to 6, characterized in that: The biopsy gun also includes a safety lock, which is sleeved on the outer surfaces of the upper shell and the lower shell. The safety lock abuts against the push handle when it is in the initial position, and is released from abutting against the push handle when the safety lock is pushed forward.

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