Biopsy needle

Abstract

The utility model provides a biopsy needle, comprising: a shell; a knife tube assembly, the knife tube assembly comprising an inner knife tube and an outer knife tube outer sleeved on the inner knife tube, the outer knife tube being connected to the shell, the front end of the outer knife tube being provided with a puncture knife tip, a sampling window being provided on the side wall of the outer knife tube close to the knife tip, and the front end of the inner knife tube being provided with a cutting blade; an inner knife seat, the inner knife seat being movably arranged in the shell, the inner knife seat being connected to the inner knife tube, and being able to drive the inner knife tube to slide along the axial direction of the outer knife tube, and the inner knife seat being able to reciprocate between the initial firing position and the completed firing position along the axial direction through operation; a sample storage chamber, arranged in the shell, the sample storage chamber having a sealed chamber connected to the inner knife tube; a chamber pressure response mechanism, arranged in the shell, the chamber pressure response mechanism changing the air pressure state of the sealed chamber according to the axial position of the inner knife tube. This scheme realizes one-time puncture and multiple sampling.

Description

Technical Field

[0001] The utility model belongs to the field of medical instruments, in particular to a biopsy needle. Background Art

[0002] Biopsy needle is a medical device, suitable for kidney, liver, lung, breast, thyroid, prostate, pancreas, testicle, uterus, ovary, body surface and other organs, can be used for sampling and aspirating cells of cone tumors and unidentified tumors, and is currently a widely used instrument in clinical practice. The puncture biopsy needle is a soft tissue biopsy instrument, which is used for puncture biopsy and interventional treatment under ultrasound guidance. It can sample the patient's lesion with minimal trauma, providing valuable preoperative diagnostic information for the clinic.

[0003] Biopsy needles currently used in clinical practice can be divided into three categories: manual biopsy needles, semi-automatic biopsy needles, and fully automatic biopsy needles. All three types of biopsy needles include a needle core and an outer knife tube that is sleeved outside the needle core. A sampling slot is set on the puncture end of the needle core for storing samples. After a sampling is completed, the sampling slot is occupied, resulting in only one sample being taken at a time. If multiple samples are required, another puncture is required. Another puncture may cause the needle tract to shift, resulting in inaccurate detection. Even multiple punctures may cause tumor cell metastasis, bringing more risks to patients. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a biopsy needle to achieve the purpose of multiple sampling with a single puncture.

[0005] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides a biopsy needle, comprising:

[0006] case;

[0007] A knife tube assembly, the knife tube assembly comprising an inner knife tube and an outer knife tube outermostly disposed on the inner knife tube, the outer knife tube being connected to the housing, a puncture tip being disposed at the front end of the outer knife tube, a sampling window being disposed on the side wall of the outer knife tube near the tip, and a cutting blade being disposed at the front end of the inner knife tube;

[0008] An inner knife seat, the inner knife seat is movably arranged in the shell, the inner knife seat is connected to the inner knife tube, and can drive the inner knife tube to slide along the axial direction of the outer knife tube, and the inner knife seat can move back and forth between the firing initial position and the firing completion position along the axial direction through operation;

[0009] A sample storage chamber is disposed in the shell, and the sample storage chamber has a sealed cavity connected with the inner knife tube;

[0010] A chamber pressure response mechanism is arranged in the shell, and the chamber pressure response mechanism changes the air pressure state of the sealing chamber according to the axial position of the inner knife tube. When the inner knife seat moves from the firing completion position to the firing initial position during the winding process, the chamber pressure response mechanism causes the sealing chamber to form a negative pressure for sucking tissue. When the inner knife seat moves from the firing initial position to the firing completion position during the firing process, the chamber pressure response mechanism causes the sealing chamber to release pressure.

[0011] Optionally, the warehouse pressure response mechanism includes:

[0012] A piston body, wherein at least a part of the piston body is arranged in the sample storage chamber and forms the sealed chamber with the inner wall of the sample storage chamber, the piston body is connected to the inner knife holder and moves with the inner knife holder, the volume of the sealed chamber gradually decreases during the firing process, and the volume of the sealed chamber gradually increases during the winding process;

[0013] A valve assembly is used to seal or relieve pressure in the sealed chamber. The valve assembly is disposed on the piston body and is configured to: adaptively open during the firing process to relieve pressure in the sealed chamber, and adaptively close during the winding process to establish the negative pressure in the sealed chamber.

[0014] Optionally, a pressure relief chamber connected to the sealing chamber is provided in the piston body, the pressure relief chamber has a stepped surface connected to the inner wall of the sealing chamber, and the valve assembly includes:

[0015] A valve body is movably arranged in the pressure relief chamber, and the movable position of the valve body includes a blocking position and a non-blocking position. When the valve body is located at the blocking position, the valve body cooperates with the step surface to form a plane seal to seal the sealing chamber and the pressure relief chamber. When the valve body is located at the non-blocking position, the valve body and the step surface are spaced to form a pressure relief gap, and the pressure relief gap communicates with the pressure relief chamber and the sealing chamber respectively.

[0016] A first compression elastic member is disposed in the pressure relief chamber, and the first compression elastic member provides an elastic force for driving the pressure relief chamber to remain in the blocking position;

[0017] Wherein, the active position of the valve body responds to the position of the inner knife seat. When the inner knife seat is in the process of winding from the firing completion position to the firing initial position, the valve body remains in the blocking position. When the inner knife seat is in the process of firing from the firing initial position to the firing completion position, the valve body moves from the blocking position to the non-blocking position and then returns to the blocking position.

[0018] Optionally, the sample storage chamber has a blocked end and an open end along the axial direction, the piston body extends from the open end into the internal cavity of the sample storage chamber, and along the axial direction, the open end is arranged at a position where the blocked end is away from the puncture tip, an abutment surface is arranged in the piston body, the first compression elastic member is arranged at a position where the valve body is away from the puncture tip, and the two ends of the first compression elastic member respectively abut against the abutment surface and the valve body.

[0019] Optionally, the pressure relief chamber includes a connected installation chamber and a pressure relief channel, the installation chamber is connected to the sealing chamber, the valve assembly is arranged in the installation chamber, and the pressure relief channel extends from the installation chamber to the outside of the piston body.

[0020] Optionally, the pressure relief channel and the mounting cavity are arranged along the axial direction, and the mounting cavity extends axially to the end of the piston body facing away from the puncture tip, so that a mounting opening and a mounting channel are formed on the piston body, and a limiting sleeve is arranged in the piston body, and the limiting sleeve is installed in the mounting channel through the mounting opening, the pressure relief channel is arranged in the limiting sleeve, and the abutment surface is formed on the limiting sleeve.

[0021] Optionally, a pulling portion for pulling the piston body out of the sample storage chamber is provided at one end of the piston body facing away from the puncture tip.

[0022] Optionally, a portion of the sealed cavity is formed on the sample storage chamber body, and another portion of the sealed cavity is formed on the piston body.

[0023] Optionally, a accommodating cavity is provided in the inner knife seat, and the sample storage chamber is arranged in the accommodating cavity. A guide strip groove is also opened on the side wall of the inner knife seat, and the guide strip groove extends along the axial direction; a connecting part is provided on the shell, and the connecting part cooperates to pass through the guide strip groove and extends into the accommodating cavity to be connected with the sample storage chamber body.

[0024] Optionally, the biopsy needle further comprises:

[0025] A self-locking buckle, the self-locking buckle is arranged between the housing and the inner knife seat, and the self-locking buckle is used to lock or unlock the inner knife seat relative to the housing at the firing initial position;

[0026] A second compression elastic member is arranged in the shell, and two ends of the second compression elastic member are directly or indirectly against the shell and the inner knife seat respectively, and the second compression elastic member is used to drive the inner knife seat and the shell to fire from the firing initial position to the firing completion position in the unlocked state; wherein, a hollow area is provided on the shell, and the inner knife seat has a winding operation part exposed in the hollow area; when the inner knife seat is driven by the winding operation part to move from the firing completion position to the firing initial position, the self-locking buckle is automatically locked to complete the winding process; when the self-locking buckle is unlocked, the inner knife seat moves from the firing initial position to the firing position under the elastic force of the second compression elastic member.

[0027] Optionally, the second compression elastic member is a spring, the spring is wrapped with an elastic sleeve, the front end of the sample storage chamber is provided with an opening for the inner knife tube to extend into, and the gap between the inner knife tube and the inner wall of the opening is sealed by the elastic sleeve.

[0028] As described above, the biopsy needle of the utility model is provided with a chamber pressure response mechanism, and the air pressure state in the sealed cavity for storing samples will change according to the axial position of the inner knife seat, so that a negative pressure for sucking tissue can be established in the sealed cavity each time the needle is wound up, and the pressure can be released each time the needle is fired to achieve cutting of the tissue. It is only necessary to alternately wind up and fire the needle so that the inner knife seat can move back and forth axially between the initial firing position and the completed firing position, so that multiple samplings can be achieved. In addition, since the knife tube assembly adopts a method of providing a sampling window on the outer knife tube and a cutting blade at the front end of the inner knife tube, no matter how many times the inner knife tube reciprocates in the outer knife tube for sampling, there is no need to change the position of the outer knife tube, and the needle channel does not need to be transferred. Any number of samplings can be achieved with a single puncture, which is conducive to avoiding various problems caused by needle channel transfer. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a front view of the biopsy needle in the embodiment of the utility model.

[0030] Figure 2 for Figure 1 Enlarged view of point A0 in the middle.

[0031] Figure 3 Schematic diagram of the internal structure of the biopsy needle in the embodiment of the utility model.

[0032] Figure 4 It is another schematic diagram of the internal structure of the biopsy needle in the embodiment of the utility model.

[0033] Figure 5 It is a partial schematic diagram of a biopsy needle in an embodiment of the utility model.

[0034] The reference numerals in the drawings of the specification include:

[0035] Shell 1, first shell 101, hollow area 1011, winding operation part 1012, second shell 102, connection part 103,

[0036] Knife tube assembly 2, outer knife tube 201, sampling window 2011, inner knife tube 202, puncture knife tip 203,

[0037] Inner knife seat 3, guide strip groove 301, accommodating cavity 302,

[0038] Sample storage chamber 4,

[0039] Warehouse pressure response mechanism 5, piston body 501, sealing ring 5011, stepped surface 5012, valve assembly 502, valve body 5021, first compression elastic member 5022, limiting sleeve 5023,

[0040] The second compression elastic member 6,

[0041] Elastic sleeve 7,

[0042] Self-locking buckle 8, first buckle 801, second buckle 802,

[0043] Sealed cavity 9,

[0044] Pressure relief chamber 10, installation chamber 1001, pressure relief channel 1002. DETAILED DESCRIPTION

[0045] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0046] The utility model provides a biopsy needle, such as Figures 1 to 5 shown.

[0047] In an exemplary embodiment of the present application, a biopsy needle includes:

[0048] Shell 1;

[0049] The knife tube assembly 2 comprises an inner knife tube 202 and an outer knife tube 201 which is outermost of the inner knife tube 202. The outer knife tube 201 is connected to the housing 1. A puncture tip 203 is provided at the front end of the outer knife tube 201. A sampling window 2011 is provided on the side wall of the outer knife tube 201 near the tip. A cutting blade is provided at the front end of the inner knife tube 202.

[0050] The inner knife seat 3 is movably arranged in the housing 1, and the inner knife seat 3 is connected to the inner knife tube 202, and can drive the inner knife tube 202 to slide along the axial direction of the outer knife tube 201. The inner knife seat 3 can move back and forth between the firing initial position and the firing completion position along the axial direction through operation;

[0051] The sample storage chamber 4 is arranged in the housing 1, and has a sealed cavity 9 in communication with the inner knife tube 202;

[0052] The chamber pressure response mechanism 5 is arranged in the shell body 1. The chamber pressure response mechanism 5 changes the air pressure state of the sealing chamber 9 according to the axial position of the inner knife tube 202. When the inner knife seat 3 moves from the firing completion position to the firing initial position during the winding process, the chamber pressure response mechanism 5 forms a negative pressure in the sealing chamber 9 for sucking tissue. When the inner knife seat 3 moves from the firing initial position to the firing completion position during the firing process, the chamber pressure response mechanism 5 releases the pressure in the sealing chamber 9.

[0053] It is worth mentioning that the operation of the inner knife seat includes firing and winding. During the winding process, the inner knife seat 3 moves from the firing completion position to the firing initial position, and the chamber pressure response mechanism 5 acts accordingly, so that the sealing chamber 9 forms a negative pressure, and the tissue in the inner knife tube 202 is sucked into the sealing chamber 9; during the firing process, the inner knife tube 202 moves forward to cut the tissue, and the inner knife seat 3 moves from the firing initial position to the firing completion position, and the chamber pressure response mechanism 5 acts accordingly, so that the sealing chamber 9 forms a positive pressure. When the pressure value reaches a certain critical value, the sealing chamber 9 begins to relieve pressure, which can reduce the pressure of the sealing chamber 9 in advance before the next winding operation, which is conducive to establishing a negative pressure sufficient to suck the tissue into the sealing chamber 9 when firing again.

[0054] When in use, first puncture the puncture tip 203 to the target position (at this time, the inner knife seat 3 needs to be in the firing completion position, and the inner knife tube is in the window-closing position that blocks the sampling window 2011); then wind up the biopsy needle, and establish negative pressure in the sample storage chamber to prepare for sampling; then fire again to achieve tissue cutting; then wind up again, and establish negative pressure in the sample storage chamber again, and the tissue in the inner knife tube 202 is sucked into the sample storage chamber body 4; after that, the firing and winding operations are repeated alternately to achieve multiple sampling. During the whole process, the position of the outer knife tube 201 remains unchanged, so that the puncture tip 203 is always kept in the same puncture position, and the needle path does not need to be transferred, which is conducive to avoiding various problems caused by needle path transfer.

[0055] In this embodiment, the air pressure state in the sealed cavity 9 is changed with the movement of the inner knife seat 3, and the air pressure state includes a positive pressure state and a negative pressure state. In the negative pressure state, power is provided for the tissue to be sucked into the sealed cavity 9, and pressure relief is performed in the positive pressure state, which is conducive to reducing the pressure in the sealed cavity 9 and establishing sufficient negative pressure by suction of the tissue.

[0056] Exemplarily, the shell 1 includes a first shell 101 and a second shell 102 that can be opened and closed. The first shell 101 and the second shell 102 are combined to form an installation space for the inner knife seat 3 to facilitate the assembly of the inner knife seat 3, the sample storage chamber 4, etc.

[0057] Reference Figure 3As shown, in an exemplary embodiment, the bin pressure response mechanism 5 includes:

[0058] The piston body 501 is at least partially arranged in the sample storage chamber 4 and encloses the sealed chamber 9 with the inner wall of the sample storage chamber 4. The piston body 501 is connected to the inner knife seat 3 and moves with the inner knife seat 3. The volume of the sealed chamber 9 gradually decreases during the firing process, so that the pressure in the sealed chamber 9 increases as the volume decreases. The volume of the sealed chamber 9 gradually increases during the winding process, so that the pressure in the sealed chamber 9 decreases as the volume increases, thereby establishing a negative pressure.

[0059] The valve assembly 502 is used to seal or release pressure in the sealed chamber 9. The valve assembly 502 is disposed on the piston body 501. The valve assembly 502 is configured to: adaptively open during the firing process to release pressure in the sealed chamber 9, and adaptively close during the winding process to establish negative pressure in the sealed chamber 9. It should be noted that the sample storage chamber body 4 is connected to the housing 1, and the piston body 501 is connected to the inner knife seat 3, so that when the biopsy needle switches the working state between the firing state and the winding state, the sample storage chamber body 4 moves with the housing 1, and the piston body 501 moves with the inner knife seat 3, and there is no need to operate the piston body 501 and the valve assembly 502 separately, so that the operation of the biopsy needle remains simple.

[0060] The following is an exemplary description of the valve assembly 502 realizing "adaptively opening during the firing process to release the pressure in the sealed chamber 9, and adaptively closing during the winding process to establish a negative pressure in the sealed chamber 9":

[0061] In an exemplary embodiment, a pressure relief chamber 10 connected to the sealing chamber 9 is provided in the piston body 501, and the pressure relief chamber 10 has a stepped surface 5012 connected to the inner wall of the sealing chamber 9. The valve assembly 502 includes:

[0062] The valve body 5021 is movably arranged in the pressure relief chamber 10. The movable position of the valve body 5021 includes a blocking position and a non-blocking position. When the valve body 5021 is in the blocking position, the valve body 5021 cooperates with the step surface 5012 to form a plane seal to seal the sealing chamber 9 and the pressure relief chamber 10. When the valve body 5021 is in the non-blocking position, the valve body 5021 and the step surface 5012 are spaced to form a pressure relief gap, and the pressure relief gap is connected to the pressure relief chamber 10 and the sealing chamber 9 respectively; that is, when the valve body 5021 is in the blocking position, the air pressure in the sealing chamber 9 changes with the movement of the piston body 501. When the valve body 5021 is in the non-blocking position, the sealing chamber 9 is in a pressure relief state;

[0063] A first compression elastic member 5022 is disposed in the pressure relief chamber 10, and the first compression elastic member 5022 provides an elastic force for driving the pressure relief chamber 10 to remain in a blocking position;

[0064] Among them, the active position of the valve body 5021 responds to the position of the inner knife seat 3. When the inner knife seat 3 is in the process of winding from the firing completion position to the firing initial position, the valve body 5021 remains in the blocking position. When the inner knife seat 3 is in the process of firing from the firing initial position to the firing completion position, the valve body 5021 moves from the blocking position to the non-blocking position and then returns to the blocking position. It is worth mentioning that when the inner knife seat 3 is in the process of winding from the firing completion position to the firing initial position, due to the negative pressure established in the sealing chamber 9, the negative pressure and the atmospheric pressure in the pressure relief chamber 10 are both conducive to keeping the valve body 5021 in the blocking position; and the elastic force of the first compression elastic member 5022 also acts on the valve body 5021, so that the valve body 5021 is kept in the blocking position; when the inner knife seat 3 is in the process of firing from the firing initial position to the firing completion position, the pressure in the sealing chamber 9 increases. When the pressure in the sealing chamber 9 is greater than the elastic force of the first compression elastic member 5022, the pressure in the sealing chamber 9 drives the valve body 5021 to move from the blocking position to the non-blocking position, and the valve body 5021 and the step surface 5012 are spaced to form a pressure relief gap, and the sealing chamber 9 is depressurized. When the pressure in the sealing chamber 9 is less than the elastic force of the first compression elastic member 5022, the valve body 5021 returns from the non-blocking position to the blocking position, and the sealing chamber 9 is sealed again.

[0065] It should be noted that there is only one blocking position mentioned above, and the non-blocking position can be any position within the movable range of the valve body 5021 except the blocking position, that is, the non-blocking position here can correspond to multiple positions.

[0066] In this structure, since the sealing chamber 9 can relieve pressure, it is possible to avoid a large resistance to the forward movement of the inner knife seat 3 due to excessive pressure in the sealing chamber 9 during the firing process, which is beneficial to ensuring that the firing process can guarantee a sufficient firing speed, and is also beneficial to ensuring the effect of cutting tissue; in addition, by providing the first compression elastic member 5022, the valve body 5021 can adaptively move with the pressure change in the sealing chamber 9, thereby realizing automatic pressure relief and sealing of the sealing chamber 9.

[0067] Exemplarily, the first compression elastic member 5022 is a spring.

[0068] In an exemplary embodiment, the sample storage chamber body 4 has a blocked end and an open end along the axial direction, and the piston body 501 extends into the internal cavity of the sample storage chamber body 4 from the open end. Along the axial direction, the open end is arranged at a position where the blocked end is away from the puncture tip, and a supporting surface is arranged inside the piston body 501. The first compression elastic member 5022 is arranged at a position where the valve body 5021 is away from the puncture tip 203, and the two ends of the first compression elastic member 5022 are respectively against the supporting surface and the valve body 5021.

[0069] In this embodiment, the open end is provided to facilitate the installation of the piston body 501 ; the abutment surface is provided to achieve installation limitation of the first compression elastic member 5022 .

[0070] In an exemplary embodiment, the pressure relief chamber 10 includes a connected installation chamber 1001 and a pressure relief channel 1002 , the installation chamber 1001 is connected to the sealing chamber 9 , the valve assembly 502 is disposed in the installation chamber 1001 , and the pressure relief channel 1002 extends from the installation chamber 1001 to the outside of the piston body 501 .

[0071] It should be noted that the installation cavity 1001 provides an installation space for the valve assembly 502, and the pressure relief channel 1002 can be set at one or more positions on the piston body 501, as long as it is connected to the installation cavity 1001 and connected to the external air pressure.

[0072] In an exemplary embodiment, the pressure relief channel 1002 and the mounting cavity 1001 are arranged along the axial direction, and the mounting cavity 1001 extends axially to the end of the piston body 501 facing away from the puncture tip 203, so that a mounting opening and a mounting channel are formed on the piston body, and a limiting sleeve 5023 is arranged in the piston body 501, and the limiting sleeve 5023 is installed in the mounting channel of the piston body 501 through the mounting opening, and the pressure relief channel 1002 is arranged in the limiting sleeve 5023, and abutment surface is formed on the limiting sleeve 5023.

[0073] In this embodiment, a limiting sleeve 5023 is provided to limit the first compression elastic member 5022, so that the first compression elastic member 5022 abuts against the abutting surface on the limiting sleeve 5023. The pressure relief channel 1002 and the installation cavity 1001 are arranged along the axial direction, which is conducive to the rapid discharge of gas during the pressure relief process. The installation channel and the installation opening are provided to facilitate the installation of the limiting sleeve.

[0074] Exemplarily, the piston body 501 is installed in the internal cavity of the sample storage chamber 4, and a sealing ring 5011 is provided between the outer wall of the piston body 501 and the cavity wall of the internal cavity. The sealing ring 5011 is provided to achieve sealing between the outer wall of the piston body 501 and the cavity wall of the internal cavity.

[0075] In an exemplary embodiment, a pulling portion for pulling the piston body 501 out of the sample storage chamber 4 is provided at one end of the piston body 501 away from the puncture tip 203. In this way, the tissue can be taken out after the sample storage chamber 4 is pulled out. Figure 3 The pulling portion can be in the form of a pull ring.

[0076] In an exemplary embodiment, a portion of the sealed cavity 9 is formed on the sample storage chamber body 4 , and another portion of the sealed cavity 9 is formed on the piston body 501 .

[0077] In this embodiment, the sealed cavity 9 is formed between the blocking end of the sample storage chamber 4 and the valve body 5021 . As the piston body 501 moves, the size of the sealed cavity 9 will change.

[0078] Reference Figure 5 As shown, in an exemplary embodiment, a accommodating cavity 302 is provided in the inner knife seat 3, and the sample storage chamber body 4 is arranged in the accommodating cavity 302. A guide strip groove 301 is also opened on the side wall of the inner knife seat 3, and the guide strip groove 301 extends along the axial direction; a connecting part 103 is provided on the shell 1, and the connecting part 103 cooperates to pass through the guide strip groove 301 and extends into the accommodating cavity to be connected with the sample storage chamber body 4.

[0079] In this structure, the guide strip groove 301 and the connecting part, and the sample storage chamber body 4 are fixedly connected to the guide strip groove 301, so that the sample storage chamber body 4 is integrally connected to the shell 1, and at the same time does not affect the axial movement of the inner tool holder, piston, etc.

[0080] Exemplarily, the accommodating chamber 302 includes a closed end and an open end. The closed end is used to connect with the outer knife tube 201, and the open end is provided with an installation opening connected to the outside world to facilitate the movement of the valve assembly 502 in and out, and to facilitate the valve assembly 502 to release pressure to the outside world.

[0081] For the biopsy needles of the above embodiments, if firing and winding are required, both can be achieved by operating the inner blade holder, and an exemplary description will be given below: Figure 4 As shown, in an exemplary embodiment, the biopsy needle further comprises:

[0082] A self-locking buckle 8, which is disposed between the housing 1 and the inner knife seat, and is used to lock or unlock the inner knife seat relative to the housing 1 at the initial firing position;

[0083] The second compression elastic member 6 is disposed in the housing 1, and the two ends of the second compression elastic member 6 are respectively directly or indirectly against the housing 1 and the inner knife holder 3, and the second compression elastic member 6 is used to drive the inner knife holder and the housing 1 to fire from the firing initial position to the firing completion position in the unlocked state;

[0084] Among them, a hollow area 1011 is provided on the shell 1, and the inner knife seat 3 has a winding operating part 1012 exposed in the hollow area 1011; when the inner knife seat 3 moves from the firing completion position to the firing initial position driven by the winding operating part 1012, the self-locking buckle 8 is automatically locked to complete the winding process; when the self-locking buckle 8 is unlocked, the inner knife seat 3 is fired from the firing initial position to the firing completion position under the elastic force of the second compression elastic member 6.

[0085] When winding the string, the string operation unit 1012 can be pressed to perform the winding operation. Figure 3As an example, a force from the left side to the right side of the paper can be applied to the winding operation part 1012, so that the inner knife seat 3 moves from left to right. When the inner knife seat moves to the initial firing position, the self-locking bayonet automatically locks the inner knife seat in the initial firing position; when firing, as long as the self-locking buckle 8 is manually unlocked, the inner knife seat 3 will automatically fire from the initial firing position to the firing completion position under the action of elastic force. In this process, the surface of the entire biopsy needle shell 1 can be held, and then the thumb is used to perform the winding operation at the winding operation part 1012, and the thumb is used to unlock the self-locking buckle.

[0086] With this structure, both topspin and firing can be completed with just one hand, making operation convenient.

[0087] Exemplarily, the self-locking buckle 8 includes a first buckle 801 disposed on the housing 1 and a second buckle 802 disposed on the inner tool holder, and the first buckle 801 and the second buckle 802 cooperate to achieve locking and unlocking between the inner tool holder 3 and the housing 1 .

[0088] The second compression elastic member 6 enables the inner blade tube 202 and the inner blade holder 3 to move and fire under the elastic force after the first buckle 801 and the second buckle 802 are unlocked. In the winding state, the second compression elastic member 6 is compressed, and in the firing state, the second compression elastic member 6 is naturally stretched.

[0089] Exemplarily, one end of the second compression elastic member 6 abuts against the inner knife seat 3 , and the other end of the second compression elastic member 6 abuts against the sample storage chamber 4 .

[0090] In an exemplary embodiment, the second compression elastic member 6 is a spring, which is wrapped with an elastic sleeve 7. An opening is provided at the front end of the sample storage chamber 4 for the inner knife tube 202 to extend into, and the gap between the inner knife tube 202 and the inner wall of the opening is sealed by the elastic sleeve 7.

[0091] In this embodiment, the setting of the elastic sleeve 7 not only guides the expansion and contraction of the second compression elastic member 6, but also seals the opening at the front end of the sample storage chamber 4. The above embodiments are only illustrative of the principle and efficacy of the utility model, and are not intended to limit the utility model. Anyone familiar with this technology may modify or change the above embodiments without violating the spirit and scope of the utility model. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed in the utility model should still be covered by the claims of the utility model.

Claims

1. A biopsy needle, characterized in that: include: case; A knife tube assembly, the knife tube assembly comprising an inner knife tube and an outer knife tube outermostly disposed on the inner knife tube, the outer knife tube being connected to the housing, a puncture tip being disposed at the front end of the outer knife tube, a sampling window being disposed on the side wall of the outer knife tube near the tip, and a cutting blade being disposed at the front end of the inner knife tube; An inner knife seat, the inner knife seat is movably arranged in the shell, the inner knife seat is connected to the inner knife tube, and can drive the inner knife tube to slide along the axial direction of the outer knife tube, and the inner knife seat can move back and forth between the firing initial position and the firing completion position along the axial direction through operation; A sample storage chamber is disposed in the shell, and the sample storage chamber has a sealed cavity connected with the inner knife tube; A chamber pressure response mechanism is arranged in the shell, and the chamber pressure response mechanism changes the air pressure state of the sealing chamber according to the axial position of the inner knife tube. When the inner knife seat moves from the firing completion position to the firing initial position during the winding process, the chamber pressure response mechanism causes the sealing chamber to form a negative pressure for sucking tissue. When the inner knife seat moves from the firing initial position to the firing completion position during the firing process, the chamber pressure response mechanism causes the sealing chamber to release pressure.

2. The biopsy needle according to claim 1, characterized in that: The warehouse pressure response mechanism comprises: A piston body, wherein at least a part of the piston body is arranged in the sample storage chamber and forms the sealed chamber with the inner wall of the sample storage chamber, the piston body is connected to the inner knife holder and moves with the inner knife holder, the volume of the sealed chamber gradually decreases during the firing process, and the volume of the sealed chamber gradually increases during the winding process; A valve assembly is used to seal or relieve pressure in the sealed chamber. The valve assembly is disposed on the piston body and is configured to: adaptively open during the firing process to relieve pressure in the sealed chamber, and adaptively close during the winding process to establish the negative pressure in the sealed chamber.

3. The biopsy needle according to claim 2, characterized in that: The piston body is provided with a pressure relief chamber connected with the sealing chamber, the pressure relief chamber has a stepped surface connected with the inner wall of the sealing chamber, and the valve assembly includes: A valve body is movably arranged in the pressure relief chamber, and the movable position of the valve body includes a blocking position and a non-blocking position. When the valve body is located at the blocking position, the valve body cooperates with the step surface to form a plane seal to seal the sealing chamber and the pressure relief chamber. When the valve body is located at the non-blocking position, the valve body and the step surface are spaced to form a pressure relief gap, and the pressure relief gap communicates with the pressure relief chamber and the sealing chamber respectively. A first compression elastic member is disposed in the pressure relief chamber, and the first compression elastic member provides an elastic force for driving the pressure relief chamber to remain in the blocking position; Wherein, the active position of the valve body responds to the position of the inner knife seat. When the inner knife seat is in the process of winding from the firing completion position to the firing initial position, the valve body remains in the blocking position. When the inner knife seat is in the process of firing from the firing initial position to the firing completion position, the valve body moves from the blocking position to the non-blocking position and then returns to the blocking position.

4. The biopsy needle according to claim 3, characterized in that: The sample storage chamber body has a blocking end and an open end along the axial direction, the piston body extends into the internal cavity of the sample storage chamber body from the open end, and along the axial direction, the open end is arranged at a position where the blocking end is away from the puncture tip, and an abutment surface is arranged in the piston body, the first compression elastic member is arranged in a position where the valve body is away from the puncture tip, and the two ends of the first compression elastic member are respectively abutted against the abutment surface and the valve body.

5. The biopsy needle according to claim 4, characterized in that: The pressure relief chamber includes a connecting installation chamber and a pressure relief passage, the installation chamber is connected with the sealing chamber, the valve assembly is arranged in the installation chamber, and the pressure relief passage extends from the installation chamber to the outside of the piston body.

6. The biopsy needle according to claim 5, characterized in that: The pressure relief channel and the mounting cavity are arranged along the axial direction, and the mounting cavity extends axially to the end of the piston body facing away from the puncture tip, so that a mounting opening and a mounting channel are formed on the piston body, and a limiting sleeve is arranged inside the piston body, and the limiting sleeve is installed in the mounting channel through the mounting opening, the pressure relief channel is arranged in the limiting sleeve, and the abutment surface is formed on the limiting sleeve.

7. The biopsy needle according to claim 4, characterized in that: The end of the piston body facing away from the puncture tip is provided with a pulling portion for pulling the piston body out of the sample storage chamber.

8. The biopsy needle according to claim 2, characterized in that: A portion of the sealing cavity is formed on the sample storage chamber body, and another portion of the sealing cavity is formed on the piston body.

9. The biopsy needle according to claim 2, characterized in that: The inner knife seat is provided with a accommodating cavity, the sample storage chamber is arranged in the accommodating cavity, and the side wall of the inner knife seat is also provided with a guide strip groove, and the guide strip groove extends along the axial direction; a connecting part is provided on the shell, and the connecting part cooperates to pass through the guide strip groove and extends into the accommodating cavity to be connected with the sample storage chamber body.

10. The biopsy needle according to any one of claims 1 to 9, characterized in that: The biopsy needle also includes: A self-locking buckle, the self-locking buckle is arranged between the housing and the inner knife seat, and the self-locking buckle is used to lock or unlock the inner knife seat relative to the housing at the firing initial position; A second compression elastic member is disposed in the housing, two ends of the second compression elastic member are directly or indirectly against the housing and the inner knife seat respectively, and the second compression elastic member is used to drive the inner knife seat and the housing to fire from the firing initial position to the firing completion position in the unlocked state; In which, a hollow area is provided on the shell, and the inner knife seat has a winding operating part exposed in the hollow area; when the inner knife seat is driven by the winding operating part to move from the firing completion position to the firing initial position, the self-locking buckle is automatically locked to complete the winding process; when the self-locking buckle is unlocked, the inner knife seat moves from the firing initial position to the firing position under the elastic force of the second compression elastic member.

11. The biopsy needle according to claim 10, characterized in that: The second compression elastic member is a spring, and an elastic sleeve is wrapped around the spring. An opening is provided at the front end of the sample storage chamber for the inner knife tube to extend into, and a gap between the inner knife tube and the inner wall of the opening is sealed by the elastic sleeve.

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