Coaxial biopsy needle

Abstract

The utility model provides a coaxial biopsy needle. The coaxial biopsy needle comprises an external component, an internal component and a shell, the external component comprises a needle tube, a tube seat connected to the near end of the needle tube and a first clamping structure arranged on the tube seat; the internal component comprises a needle core arranged in the needle tube in a penetrating manner and a core seat connected to the near end of the needle core, and the core seat abuts against the tube seat; the shell comprises a shell body and a second clamping structure arranged on the shell body, and the first clamping structure and the second clamping structure can be clamped in a matched mode. When the core seat is sleeved with the shell body and the shell body abuts against the tube seat, the first clamping structure and the second clamping structure are connected in a clamped mode, and the shell body locks the relative position of the core seat and the tube seat. And when the shell body is far away from the tube seat, the first clamping structure and the second clamping structure are separated from each other, and the relative positions of the core seat and the tube seat are unlocked. According to the coaxial biopsy needle, rapid separation of the core base and the tube base can be achieved, the powerful screwing action is not needed, and secondary damage to the human body is avoided.

Description

Technical Field

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

[0002] Coaxial biopsy needles are usually used in percutaneous tissue biopsy procedures and are used in conjunction with tissue biopsy needles for sampling. Before using a tissue biopsy needle for puncture sampling, a coaxial biopsy needle is usually used to puncture the human body in order to provide a path guide for the tissue biopsy needle and avoid damage to human tissue due to repeated use of the tissue biopsy needle for sampling.

[0003] The coaxial biopsy needle includes a needle tube and a needle core inserted into the needle tube. When using tissue biopsy to sample the target human tissue, imaging development technology is needed to provide guidance for the sampling process, so as to determine the location of the tissue biopsy needle in the human body and provide puncture path planning and guidance. For example, when using ultrasonic development equipment to provide guidance, the user usually needs to operate the development equipment with one hand and use the coaxial biopsy needle for puncture with the other hand. When puncturing to the target position, the needle core of the coaxial biopsy needle is removed, and the needle tube of the coaxial biopsy needle is left in the human body for subsequent puncture with the tissue biopsy needle.

[0004] The needle core of the currently common coaxial biopsy needle is usually connected and fixed to the needle tube through a threaded structure. In order to prevent the needle core from detaching from the needle tube during the puncture process, the pre-tightening force of the threaded structure is large, and it is difficult to use one hand to screw the threaded structure to remove the needle core. At the same time, in the process of removing the needle core, due to the large force used when screwing the threaded structure, it is easy to cause the position of the coaxial biopsy needle in the human tissue to shift, causing the needle tip of the needle tube to shake, and then causing secondary damage to the human body. In addition, the operation time of loosening the threaded structure is long, and it is easy for air to enter the needle tube and contact with human tissue, causing adverse consequences. When puncturing harder human tissues, such as calcifications, ligaments and other parts, the threaded structure is easy to rotate in the opposite direction and loosen, causing the needle core to be pushed out, leaving only the needle tube in the human body, resulting in puncture failure, causing serious clinical consequences, and causing greater damage to the patient. Utility Model Content

[0005] The utility model aims to provide a coaxial biopsy needle, aiming to solve the technical problems that the existing coaxial biopsy needle connects the needle tube and the needle core through a threaded structure, the threaded structure is easy to loosen and difficult to operate with one hand, and the process of screwing the threaded structure is easy to cause secondary damage to the human body.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0007] The utility model provides a coaxial biopsy needle, comprising an external component, an internal component and a shell;

[0008] The external component includes a needle tube, a tube seat connected to the proximal end of the needle tube, and a first clamping structure arranged on the tube seat;

[0009] The internal component includes a needle core inserted into the needle tube and a core seat connected to the proximal end of the needle core, wherein the core seat abuts against the tube seat;

[0010] The outer shell includes a shell body and a second clamping structure arranged on the shell body, and the first clamping structure and the second clamping structure can cooperate with each other to clamp; wherein, when the shell body is sleeved outside the core seat and abuts against the tube seat, the first clamping structure and the second clamping structure are clamped, and the shell body locks the relative position of the core seat and the tube seat; when the shell body is away from the tube seat, the first clamping structure and the second clamping structure are disengaged, and the relative position of the core seat and the tube seat is released.

[0011] As one of the embodiments, the first clamping structure includes a lug protruding from the side wall of the tube seat, and the second clamping structure includes a clamping part arranged on the shell body and a reset part connected to the shell body, the clamping part can move between a clamping position and an unlocking position, and the reset part can apply a reset force to the clamping part to move toward the clamping position when the clamping part is in the unlocking position, and the lug and the clamping part can be operably matched and clamped.

[0012] As one of the embodiments, the shell body has a first surface and a second surface facing each other, the shell body is provided with a receiving groove for sleeved with the core seat on the first surface, and is provided with an operating hole penetrating to the bottom of the receiving groove on the second surface, the second clamping structure is located in the receiving groove, the side surface of the proximal end of the core seat is convexly provided with an outer edge, the outer edge is located outside the tube seat, and has a first abutment surface facing the tube seat and a second abutment surface facing away from the tube seat, when the lug is clamped with the clamping piece, the bottom of the receiving groove abuts against the second abutment surface to limit the separation of the core seat from the tube seat, and the operating hole avoids part of the core seat in the axial direction of the core seat.

[0013] As one of the embodiments, the clamping member has a groove, and the lug is operably engaged with the groove.

[0014] As one of the embodiments, the clamping part includes a first clamping part, a second clamping part and a third clamping part, the first clamping part and the third clamping part are respectively connected to the two ends of the second clamping part, the first clamping part and the third clamping part face each other and are arranged at intervals, the first clamping part, the second clamping part and the third clamping part are jointly arranged to form the groove, the second clamping part is rotatably connected to the outer shell, the first clamping part is far away from the operating hole, and the third clamping part is close to the operating hole.

[0015] As one of the embodiments, the clamping member further includes a rotating shaft connected to a side surface of the second clamping portion, the rotating shaft is close to the third clamping portion, and the reset member is connected to a position of the second clamping portion close to the first clamping portion.

[0016] As one of the embodiments, when the lug is engaged with the groove, the first abutting surface () abuts against a side of the third engaging portion that is away from the first engaging portion.

[0017] As one of the embodiments, the lug has a first clamping surface facing away from the first abutting surface and a second clamping surface facing the first abutting surface, the second clamping surface is parallel to the first abutting surface, the first clamping surface is an inclined surface inclined relative to the second clamping surface, and when the lug is clamped in the groove, the first clamping surface and the second clamping surface respectively abut against the first clamping portion and the third clamping portion.

[0018] As one of the embodiments, the central axis of the operating hole coincides with the central axis of the accommodating groove, and the hole wall of the operating hole protrudes from the groove side wall of the accommodating groove.

[0019] As one of the embodiments, the core seat is further provided with a pressing protrusion protruding from the second abutting surface and adapted to the operating hole.

[0020] The technical effect of the utility model compared with the prior art is that when the coaxial biopsy needle needs to be unlocked, the operator can use the thumb to press against the core seat or use the thumb and index finger to hold the tube seat to keep the core seat and the tube seat unchanged, and then use the remaining fingers to pull the shell body so that the shell moves away from the tube seat under the action of external force and moves toward the operator. In this process, the first clamping structure and the second clamping structure can be disengaged to release the restriction on the relative position of the core seat and the tube seat, so that the internal component can be pulled out from the external component. The coaxial biopsy needle is easy to operate by pulling the shell body to release the locking of the relative position of the core seat and the tube seat. The operator can quickly separate the shell and the tube seat with less force, the operation time is short, and air is prevented from entering the needle tube. At the same time, there is no need to perform a strong twisting action, so it is not easy to cause the position of the coaxial biopsy needle in the human tissue to deviate and cause the needle tip of the needle tube to shake, thereby reducing or avoiding secondary damage to the human body. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments of the utility model or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a partial exploded view of the coaxial biopsy needle provided in the first embodiment of the utility model;

[0023] Figure 2 It is a cross-sectional view of the coaxial biopsy needle provided in the first embodiment of the utility model, wherein the first clamping structure and the second clamping structure are clamped in cooperation;

[0024] Figure 3 It is a cross-sectional view of the coaxial biopsy needle provided in the first embodiment of the utility model, wherein the first clamping structure is disengaged from the second clamping structure;

[0025] Figure 4 This is a partial structural schematic diagram of the housing of the coaxial biopsy needle provided in the first embodiment of the utility model;

[0026] Figure 5 This is a three-dimensional structural diagram of a coaxial biopsy needle provided in the second embodiment of the utility model;

[0027] Figure 6 yes Figure 5 A cross-sectional view of a coaxial biopsy needle in FIG.

[0028] Figure 7 This is a three-dimensional structural diagram of a coaxial biopsy needle provided in Embodiment 3 of the present utility model;

[0029] Figure 8 yes Figure 7 A cross-sectional view of a coaxial biopsy needle in FIG.

[0030] Fig. 9 This is a three-dimensional structural diagram of a coaxial biopsy needle provided in Embodiment 4 of the present utility model;

[0031] Fig.10 yes Fig. 9 A three-dimensional structural diagram of a snap-fit ​​member of a coaxial biopsy needle;

[0032] Fig.11 yes Fig. 9 A cross-sectional view of a coaxial biopsy needle in FIG.

[0033] Fig.12 yes Fig. 9 Cross-sectional view of the coaxial biopsy needle in FIG.

[0034] Description of reference numerals:

[0035] Embodiment 1

[0036] 10. External member; 11. Needle tube; 12. Tube seat; 121. First connection part; 122. Second connection part; 1201. Positioning hole; 13. First clamping structure; 131. Lug; 1301. First clamping surface; 1302. Second clamping surface; 20. Internal member; 21. Needle core; 22. Core seat; 221. Outer edge; 2211. First abutting surface; 2212. Second abutting surface; 222. Pressing protrusion; 30. Shell; 301. Accommodating groove; 302. Operating hole; 303. Mounting groove; 31. Shell body; 32. Second clamping structure; 3201. Groove; 321. Clamping piece; 3211. First clamping part; 3212. Second clamping part; 3213. Third clamping part; 3214. Rotating shaft; 322. Resetting piece; 3221. Spring;

[0037] Embodiment 2

[0038] 10. External component; 11. Needle tube; 12. Tube seat; 121. First connecting part; 122. Second connecting part; 1202. Connecting groove; 13. First clamping structure; 132. Clamping groove; 20. Internal component; 21. Needle core; 22. Core seat; 30. Shell; 301. Accommodating groove; 304. Avoiding groove; 31. Shell body; 32. Second clamping structure; 323. Clamping spring; 324. First clamping block;

[0039] Embodiment 3

[0040] 10. External component; 11. Needle tube; 12. Tube seat; 121. First connecting part; 122. Second connecting part; 13. First clamping structure; 132. Clamping groove; 133. Locking groove; 20. Internal component; 21. Needle core; 22. Core seat; 30. Shell; 301. Accommodating groove; 304. Avoiding groove; 31. Shell body; 32. Second clamping structure; 325. Clamping piece; 3251. First clamping body; 3252. Second clamping block; 3253. Locking block;

[0041] Embodiment 4

[0042] 10. External component; 11. Needle tube; 12. Tube seat; 121. First connecting part; 122. Second connecting part; 13. First clamping structure; 134. Raised strip; 20. Internal component; 21. Needle core; 22. Core seat; 30. Shell; 301. Accommodating groove; 304. Avoiding groove; 31. Shell body; 32. Second clamping structure; 325. Clamping piece; 3254. Second clamping body; 3255. Second clamping shaft; 3256. Third clamping block; 3257. Fourth clamping block; 3258. Operating convex ridge; 3259. Clamping groove; 3256a. Bending part; 33. Third clamping structure; 331. First slot; 332. Second slot. DETAILED DESCRIPTION

[0043] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0044] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0048] Embodiment 1

[0049] This embodiment provides a coaxial biopsy needle. Figure 1 The coaxial biopsy needle includes an outer component 10 , an inner component 20 and a housing 30 .

[0050] The external component 10 includes a needle tube 11 , a tube seat 12 connected to the proximal end of the needle tube 11 , and a first clamping structure 13 disposed on the tube seat 12 .

[0051] Please combine Figure 2 The internal component 20 includes a needle core 21 inserted into the needle tube 11 and a core seat 22 connected to the proximal end of the needle core 21 , and the core seat 22 abuts against the tube seat 12 .

[0052] The shell 30 includes a shell body 31 and a second clamping structure 32 arranged on the shell body 31, and the first clamping structure 13 and the second clamping structure 32 can be clamped with each other; wherein, when the shell body 31 is sleeved on the outside of the core seat 22 and abuts against the tube seat 12, the first clamping structure 13 and the second clamping structure 32 are clamped, and the shell body 31 locks the relative position of the core seat 22 and the tube seat 12, and the coaxial biopsy needle is locked at this time; when the shell body 31 is away from the tube seat 12, the first clamping structure 13 and the second clamping structure 32 are disengaged, and the relative position of the core seat 22 and the tube seat 12 is unlocked, and the coaxial biopsy needle is unlocked at this time.

[0053] When the coaxial biopsy needle needs to be unlocked, the operator can use the thumb to press against the core seat 22 or use the thumb and index finger to hold the tube seat 12 to keep the core seat 22 and the tube seat 12 in position, and then use the remaining fingers to pull the shell body 31 so that the outer shell 30 moves away from the tube seat 12 and toward the operator under the action of external force. In this process, the first clamping structure 13 and the second clamping structure 32 can be disengaged to release the restriction on the relative position of the core seat 22 and the tube seat 12, so that the internal component 20 can be pulled out from the external component 10. The coaxial biopsy needle is easy to operate because the locking method of the relative position of the core seat 22 and the tube seat 12 is to pull the shell body 31. The operator can quickly separate the shell 30 from the tube seat 12 with a small force, and the operation time is short, which prevents air from entering the needle tube 11. At the same time, there is no need to perform a strong twisting action, which is not easy to cause the position of the coaxial biopsy needle in the human tissue to shift and cause the needle tip of the needle tube 11 to shake, thereby reducing or avoiding secondary damage to the human body. In addition, during the puncture process after the coaxial biopsy needle is locked, the needle core 21 is subjected to a force toward the proximal end, and the core seat 22 has a tendency to move toward the proximal end relative to the shell 30 under this force. When the coaxial biopsy needle is unlocked, the shell 30 needs to move toward the proximal end relative to the core seat 22, that is, the core seat 22 moves toward the distal end relative to the shell 30. Therefore, the movement trend direction of the core seat 22 during the puncture process is opposite to the movement direction of the core seat 22 relative to the shell 30 when unlocked, and thus the coaxial biopsy needle cannot be unlocked. This can prevent the needle core 21 from being ejected and puncture failure from occurring. The overall structure is stable and has high reliability.

[0054] Specifically, the shell body 31 has a first surface and a second surface opposite to each other. The shell body 31 is provided with a receiving groove 301 on the first surface for socketing the core seat 22, and is provided with an operating hole 302 that passes through the bottom of the receiving groove 301 on the second surface. At this time, the shell body 31 is cylindrical, and the second clamping structure 32 is located in the receiving groove 301. When the shell body 31 is socketed on the outside of the core seat 22 and abuts against the tube seat 12, the first surface abuts against the tube seat 12, and the bottom surface of the receiving groove 301 abuts against the end surface of the proximal end of the core seat 22, so that the bottom surface of the receiving groove 301 and the wall surface of the limiting hole 1201 can jointly clamp the core seat 22, thereby realizing the locking of the relative position of the core seat 22 and the tube seat 12. The operation hole 302 avoids part of the core seat 22 in the axial direction of the core seat 22, so that the avoided part of the core seat 22 can be exposed in the operation hole 302. When the operator unlocks the coaxial biopsy needle, he can use the thumb to press against the part of the core seat 22 exposed in the operation hole 302 through the operation hole 302, and then use other fingers to clamp the shell body 31 and pull the shell body 31 until the first clamping structure 13 and the second clamping structure 32 are disengaged, thereby realizing the separation of the shell 30 and the tube seat 12. Only one thumb is used to limit the core seat 22 and the tube seat 12, which is more labor-saving. At the same time, it is more convenient for the operator to use other fingers to pull the shell body 31, thereby improving the reliability of the operation.

[0055] Optional, see Figure 2 The tube seat 12 may be provided with a limiting hole 1201 that is intersecting with the needle tube 11. The opening direction of the limiting hole 1201 is the same as the extension direction of the needle tube 11. The limiting hole 1201 has a tapered section whose diameter decreases toward the distal end. The side wall of the core seat 22 abuts against the hole wall of the limiting hole 1201, and the core seat 22 is limited to move toward the distal end through the hole wall of the tapered section. When the shell body 31 is sleeved on the outside of the core seat 22 and abuts against the tube seat 12, the shell body 31 and the tube seat 12 can clamp the core seat 22 together to limit the movement of the core seat 22 relative to the tube seat 12, thereby locking the relative position of the core seat 22 and the tube seat 12. In addition, the proximal end of the limiting hole 1201 can be set as a Luer cone hole. In the process of the needle core 21 being inserted into the needle tube 11 through the Luer cone hole, the tapered section can provide a buffer for the needle core 21 to avoid damaging the needle tip of the needle core 21.

[0056] Optional, see Figure 2The tube seat 12 includes a first connecting portion 121 and a second connecting portion 122, the first connecting portion 121 is connected to the needle tube 11, and the second connecting portion 122 is protruded from the proximal end surface of the first connecting portion 121. The limiting hole 1201 passes through the first connecting portion 121 and the second connecting portion 122, wherein the tapered section of the limiting hole 1201 can be located at the first connecting portion 121, and the first connecting portion 121 is cylindrical. When the shell body 31 is sleeved on the outside of the core seat 22 and abuts against the tube seat 12, the first surface of the shell body 31 abuts against the proximal end surface of the first connecting portion 121, and the first connecting portion 121 is located in the accommodating groove 301.

[0057] Optional, see Figure 2 The side surface of the proximal end of the core seat 22 is convexly provided with an outer edge 221, which is located outside the tube seat 12. The outer edge 221 has a first abutting surface 2211 facing the tube seat 12 and a second abutting surface 2212 facing away from the tube seat 12. When the shell body 31 abuts against the tube seat 12, the bottom of the accommodating groove 301 abuts against the second abutting surface 2212 to limit the separation of the core seat 22 from the tube seat 12. In this way, the shell body 31 achieves the limitation of the core seat 22 by abutting against the outer edge 221.

[0058] Optional, see Figure 2 The central axis of the operating hole 302 coincides with the central axis of the receiving groove 301, and the hole wall of the operating hole 302 protrudes from the groove side wall of the receiving groove 301. In this way, the groove bottom of the receiving groove 301 can limit the core seat 22 around the operating hole 302, eliminating the restriction on the installation angle of the housing 30.

[0059] Optional, see Figure 2 The core base 22 is also provided with a pressing protrusion 222 protruding from the second abutting surface 2212 and adapted to the operating hole 302. The operating hole 302 and the pressing protrusion 222 are adapted to limit the radial shaking of the shell body 31 relative to the tube base 12. At the same time, the pressing protrusion 222 can provide a pressing position for the operator. When unlocking the coaxial biopsy needle, the thumb can be pressed against the pressing protrusion 222, and other fingers can be used to pull the shell body 31, so as to separate the shell 30 from the tube base 12.

[0060] In some embodiments, see Figure 2 and Figure 3The first clamping structure 13 includes a lug 131 protruding from the side wall of the tube seat 12, and the lug 131 can specifically protrude from the side wall of the second connecting portion 122. The second clamping structure 32 includes a clamping member 321 arranged on the shell body 31 and a reset member 322 connected to the shell body 31. The clamping member 321 can move between a clamping position and an unlocking position. The reset member 322 can apply a reset force to the clamping member 321 to move toward the clamping position when the clamping member 321 is in the unlocking position. The lug 131 and the clamping member 321 can be operably matched and clamped. It can be understood that when the shell 30 is not sleeved on the core seat 22, the clamping piece 321 is in the clamping position under the restoring force of the reset piece 322, and in the process of the shell 30 moving toward the tube seat 12 along the axial direction of the tube seat 12, the clamping piece 321 can abut against the lug 131, and the shell 30 continues to move toward the tube seat 12. The clamping piece 321 moves toward the unlocking position under the limiting action of the lug 131 until the clamping piece 321 just passes over the lug 131, and the clamping piece 321 is reset to the clamping position under the restoring force of the reset piece 322, and at this time the clamping piece 321 can cooperate with the lug 131 for clamping. When the coaxial biopsy needle needs to be unlocked, the shell body 31 is pulled to move the shell body 31 away from the tube seat 12 along the axial direction of the tube seat 12. In the process of the shell body 31 moving away from the tube seat 12, the lug 131 applies force to the clamping member 321 to move the clamping member 321 from the clamping position toward the unlocking position until the lug 131 is separated from the clamping member 321. At this time, the clamping member 321 is reset to the clamping position under the reset force of the reset member 322, and the shell 30 is separated from the tube seat 12. In this way, the coaxial biopsy needle realizes the automatic clamping and automatic disengagement of the clamping member 321 and the lug 131 through the movement of the shell body 31 relative to the tube seat 12, which is easy to operate.

[0061] Optionally, the clamping member 321 has a groove 3201, and the lug 131 is operably engaged with the groove 3201. When the shell body 31 is sleeved on the outside of the core seat 22 and abuts against the tube seat 12, the lug 131 is engaged in the groove 3201, and the clamping member 321 is at a clamping position. When the shell body 31 is separated from the tube seat 12, the lug 131 moves out of the groove 3201, thereby realizing the disengagement of the first clamping structure 13 from the second clamping structure 32.

[0062] Specifically, please combine Figure 4The clamping member 321 includes a first clamping portion 3211, a second clamping portion 3212 and a third clamping portion 3213. The first clamping portion 3211 and the third clamping portion 3213 are respectively connected to the two ends of the second clamping portion 3212. The first clamping portion 3211 and the third clamping portion 3213 face each other and are arranged at intervals. The first clamping portion 3211, the second clamping portion 3212 and the third clamping portion 3213 are jointly arranged to form a groove 3201. The second clamping portion 3212 is rotatably connected to the housing 30. The first clamping portion 3211 is far away from the operating hole 302, and the third clamping portion 3212 is close to the operating hole 302. It can be understood that the clamping member 321 moves between the clamping position and the unlocking position by rotating relative to the shell body 31. When the clamping member 321 is in the clamping position, the notch of the groove 3201 can face the central axis of the shell 30. When the shell 30 moves toward the tube seat 12 along the axial direction of the tube seat 12, the clamping member 321 can first abut against the first clamping portion 3211. The shell 30 continues to move toward the tube seat 12, and the lug 131 drives the first clamping portion 3211 to rotate until the lug 131 passes over the first clamping portion 3211. At this time, the clamping member 321 rotates in the opposite direction under the reset force of the reset member 322 and resets to the clamping position. The lug 131 is locked in the groove 3201, thereby realizing the clamping fit between the clamping member 321 and the lug 131. At this time, the reset member 322 can limit the clamping member 321 to the current clamping position through the reset force to limit the lug 131 from being disengaged from the clamping member 321. When the coaxial biopsy needle needs to be unlocked, the shell body 31 is pulled along the axial direction of the tube seat 12, and the lug 131 applies force to the first clamping part 3211 under the action of external force to overcome the restoring force of the reset member 322 to turn the first clamping part 3211, so that the clamping part 321 rotates from the clamping position to the unlocking position until the lug 131 is disengaged from the groove 3201, the lug 131 and the clamping part 321 are disengaged, and the clamping part 321 rotates in the opposite direction under the restoring force of the reset member 322, and resets to the clamping position again, and the shell 30 is separated from the tube seat 12. The coaxial biopsy needle realizes the automatic switching of the clamping part 321 between the clamping position and the unlocking position through the rotation of the clamping part 321 and the restoring force of the reset member 322, and has high reliability.

[0063] Among them, the first clamping portion 3211 and the third clamping portion 3213 can be parallel, and the first clamping portion 3211 and the third clamping portion 3213 are both perpendicular to the second clamping portion 3212. The length of the first clamping portion 3211 is smaller than the length of the third clamping portion 3213, so that the lug 131 can pass over the first clamping portion 3211 and be clamped into the groove 3201.

[0064] Optional, see Figure 4The clamping member 321 further includes a rotating shaft 3214 connected to the side of the second clamping portion 3212, the rotating shaft 3214 is close to the third clamping portion 3213, and the reset member 322 is connected to the position of the second clamping portion 3212 close to the first clamping portion 3211. In this way, the rotation axis of the clamping member 321 is close to the third clamping portion 3213, which increases the length of the force arm of the third clamping portion 3212, thereby reducing the external force required to drive the clamping member 321 to rotate, so that the operator can pull the shell body 31 to unlock with less effort.

[0065] Optional, see Figure 2 and Figure 3 The reset member 322 is a spring 3221, and the reset force is the elastic force of the spring 3221. The groove wall of the accommodating groove 301 is provided with a mounting groove 303, and the spring 3221 is partially accommodated in the mounting groove 303. One end of the spring 3221 protruding from the mounting groove 303 abuts against the position of the second clamping portion 3212 close to the first clamping portion 3211. When the clamping member 321 is in the clamping state, the spring 3221 is in a natural extension state or a compression state. When the shell body 31 moves toward the tube seat 12 and the shell body 31 moves away from the tube seat 12, the lug 131 applies force to the first clamping portion 3211, and the clamping member 321 rotates in the direction of the compressed spring 3221. At this time, the spring 3221 is compressed and applies a reset force to the clamping member 321.

[0066] In some embodiments, see Figure 2 and Figure 3 When the lug 131 is engaged with the groove 3201, the first abutting surface 2211 abuts against the side of the third engaging portion 3213 facing away from the first engaging portion 3211. At this time, the first abutting surface 2211 can limit the engaging member 321 from further rotating. When the shell body 31 moves away from the tube seat 12 in the axial direction, the first abutting surface 2211 can drive the third engaging portion 3213 to rotate under the action of external force, so as to assist the lug 131 to escape from the groove 3201.

[0067] Optional, see Figure 2 and Figure 3 The lug 131 has a first clamping surface 1301 facing away from the first abutting surface 2211 and a second clamping surface 1302 facing the first abutting surface 2211, the second clamping surface 1302 is parallel to the first abutting surface 2211, the first clamping surface 1301 is an inclined surface inclined relative to the second clamping surface 1302, and when the lug 131 is clamped in the groove 3201, the first clamping surface 1301 and the second clamping surface 1302 respectively abut against the first clamping portion 3211 and the third clamping portion 3213. The inclined setting of the first clamping surface 1301 can guide the rotation of the first clamping portion 3211, and at the same time reduce the external force required to apply to rotate the clamping member 321, so that the operator can save more effort when pulling the shell body 31.

[0068] In other embodiments, the first clamping structure 13 may include a clamping member 321 and a reset member 322 both connected to the tube seat 12, and the second clamping structure 32 includes a lug 131, and the reset member 322 may also be an elastic rope, a spring sheet, an elastic rod, a magnetic member, etc., which is not limited here.

[0069] Embodiment 2

[0070] The second embodiment provides a coaxial biopsy needle, which has a substantially similar structure to the coaxial biopsy needle in the first embodiment. Compared with the coaxial biopsy needle in the first embodiment, the coaxial biopsy needle in the second embodiment is different in that: Figure 5 and Figure 6 The shell body 31 is provided with a receiving groove 301, and the proximal end of the core seat 22 is connected to the bottom of the receiving groove 301. The tube seat 12 is provided with a connecting groove 1202. A first clamping structure 13 is provided on the groove wall of the connecting groove 1202 away from the central axis of the tube seat 12. The second clamping structure 32 is connected to the side wall of the shell body 31 and can extend into the connecting groove 1202. The second clamping structure 32 can undergo elastic deformation. When the shell body 31 abuts against the tube seat 12, the second clamping structure 32 and the first clamping structure 13 can be operably matched and clamped.

[0071] In this way, when it is necessary to lock the relative position of the core seat 22 and the tube seat 12, the needle core 21 is inserted into the needle tube 11, and the operator presses the second clamping structure 32 at the same time to make the second clamping structure 32 elastically deform toward the central axis of the shell body 31, and then align the second clamping structure 32 with the connecting groove 1202 and insert it into the connecting groove 1202 until the core seat 22 abuts against the hole wall of the limiting hole 1201 of the tube seat 12. The operator releases the second clamping structure 32, and the second clamping structure 32 realizes a clamping fit with the first clamping structure 13. When it is necessary to unlock the relative position of the core seat 22 and the tube seat 12, the operator only needs to press the second clamping structure 32 to disengage the second clamping structure 32 from the first clamping structure 13, and then the operator pulls the shell 30 to remove the second clamping structure 32 from the housing and remove the needle core 21 from the needle tube 11. During the operation, only pressing operation is required, which is convenient and labor-saving, and can realize the rapid separation of the needle core 21 and the needle tube 11, thereby improving the reliability of the operation.

[0072] Optional, see Figure 5 and Figure 6The first clamping structure 13 includes a clamping groove 132 opened on the groove wall of the connecting groove 1202, and the shell body 31 is provided with an avoidance groove 304 on the first surface. The avoidance groove 304 passes through the outer surface of the shell body 31 and the groove wall of the accommodating groove 301. The second clamping structure 32 includes a clamping spring piece 323 arranged at the groove bottom of the avoidance groove 304. The extending end of the clamping spring piece 323 protrudes from the first surface of the shell body 31, and the extending end of the clamping spring piece 323 is provided with a first clamping block 324, and the first clamping block 324 can be operably engaged with the clamping groove 132.

[0073] Optional, see Figure 6 There are two snap-on springs 323, the number of which is equal to the number of the avoidance slots 304, and one snap-on spring 323 is disposed in each avoidance slot 304. The two snap-on springs 323 are disposed on opposite sides of the shell body 31, respectively, so that the operator can press the two snap-on springs 323 at the same time. Correspondingly, there are two connection slots 1202 and two snap-on slots 132, respectively, and one snap-on slot 132 is disposed on the slot wall of each connection slot 1202, and the positions of the snap-on springs 323 and the connection slots 1202 correspond.

[0074] Optionally, the connecting groove 1202 may also be an annular groove, and correspondingly, the engaging groove 132 may also be an annular groove extending circumferentially along the connecting groove 1202 to eliminate the restriction on the engaging angle of the engaging spring piece 323 .

[0075] In other embodiments, the first clamping structure 13 may also be a clamping spring 323 , and the second clamping structure 32 may also be a clamping groove 132 , which is not limited here.

[0076] Embodiment 3

[0077] The third embodiment provides a coaxial biopsy needle, which has a substantially similar structure to the coaxial biopsy needle in the second embodiment. Compared with the coaxial biopsy needle in the second embodiment, the coaxial biopsy needle in the third embodiment is different in that: Figure 7 and Figure 8 The second clamping structure 32 includes a clamping member 325 rotatably connected to the shell body 31, the clamping member 325 includes a first clamping body 3251, a first clamping shaft and a second clamping block 3252, the first clamping body 3251 has a first end and a second end, the first clamping shaft is located in the middle of the clamping body, that is, between the first end and the second end, the first clamping shaft is rotatably connected to the groove wall of the avoidance groove 304, the rotation axis of the first clamping shaft is perpendicular to the central axis of the shell body 31, the first end of the first clamping body 3251 is close to the groove bottom of the avoidance groove 304, the second end of the first clamping body 3251 is away from the groove bottom of the avoidance groove 304, the second clamping block 3252 is connected to the second end of the first clamping body 3251, and the clamping groove 132 is opened on the side wall of the tube seat 12.

[0078] In this way, when it is necessary to lock the relative position of the core seat 22 and the tube seat 12, the needle core 21 is inserted into the needle tube 11, and at the same time the operator presses the first end of the first buckle body 3251 to rotate the buckle 325, and the second end of the first buckle body 3251 moves in a direction away from the central axis of the shell body 31, and then the operator presses the second end of the buckle 325 to rotate the buckle 325 in the opposite direction, and the second end moves toward the snap-in groove 132 until the second clamping block 3252 is snapped into the snap-in groove 132, thereby realizing the snap-in cooperation between the first snap-in structure 13 and the first snap-in structure 13. When it is necessary to unlock the relative position of the core seat 22 and the tube seat 12, the operator only needs to press the first end of the latch 325 to make the latch 325 rotate, and the second end of the first latch body 3251 moves in the direction away from the central axis of the shell body 31 until the second latch block 3252 disengages from the latching groove 132, so that the second latching structure 32 and the first latching structure 13 can be disengaged. Then the operator can pull the shell 30 to remove the latch 325 from the connecting groove and remove the needle core 21 from the needle tube 11 at the same time. During the operation, only pressing operation is required, which is convenient and labor-saving, and can realize the rapid separation of the needle core 21 and the needle tube 11, thereby improving the reliability of the operation.

[0079] Optional, see Figure 7 and Figure 8 In order to improve the clamping reliability of the first clamping structure 13 and the second clamping structure 32, a locking groove 133 can be opened on the groove wall at the proximal end of the clamping groove 132, and accordingly, a locking block 3253 is convexly provided on the proximal side of the second clamping block 3252, wherein the clamping member 325 can undergo a certain elastic deformation, so that when the second clamping block 3252 is clamped in the clamping groove 132, the locking block 3253 is synchronously clamped in the locking groove 133, so that the locking block 3253 can be disengaged from the locking groove 133 only under the action of a certain external force, thereby preventing the first clamping structure 13 and the second clamping structure 32 from being accidentally disengaged.

[0080] In other embodiments, a locking block 3253 may be provided on the groove wall at the proximal end of the engaging groove 132 , and a locking groove 133 may be provided on the proximal side surface of the second engaging block 3252 , which is not limited here.

[0081] Embodiment 4

[0082] The fourth embodiment provides a coaxial biopsy needle, which has a substantially similar structure to the coaxial biopsy needle in the third embodiment. Compared with the coaxial biopsy needle in the third embodiment, the coaxial biopsy needle in the fourth embodiment is different in that: Fig. 9 and Fig.10The buckle 325 includes a second buckle body 3254, a second clamping shaft 3255, a third clamping block 3256 and a fourth clamping block 3257. The second buckle body 3254 has a first end and a second end, the second clamping shaft 3255 is connected to the first end of the second buckle body 3254, the second clamping shaft 3255 is rotatably connected to the bottom of the avoidance groove 304, the rotation axis of the second clamping shaft 3255 is parallel to the central axis of the shell body 31, and the third clamping block 3256 is connected to the second end of the second buckle body 3254. Correspondingly, the shell body 31 is provided with a third clamping structure 33 at a position close to the avoidance groove 304, wherein the second clamping shaft 3255 can be provided at a position of a side groove wall opened into the avoidance groove 304, and the third clamping structure 33 can be provided at the other side groove wall close to the avoidance groove 304 opposite to the second clamping shaft 3255. The second clamping shaft 3255 can be located at opposite sides of the avoidance groove 304. The clamping member 325 can be rotated relative to the shell body 31 to make the third clamping block 3256 clamped to the third clamping structure 33. The fourth clamping block 3257 is connected to the inner side of the distal end of the second clamping body 3254. When the shell body 31 abuts against the tube seat 12 and the third clamping block 3256 is clamped to the third clamping structure 33, the fourth clamping block 3257 is operably matched with the first clamping structure 13. Among them, the second clamping body 3254 is a curved plate and can undergo a certain degree of elastic deformation.

[0083] In this way, when it is necessary to lock the relative position of the core seat 22 and the tube seat 12, the needle core 21 is inserted into the needle tube 11, and at the same time, the operator presses the second end of the second buckle body 3254 in the direction of the second clamping shaft 3255, so that the second buckle body 3254 undergoes elastic deformation with an increased curvature, thereby disengaging the third clamping block 3256 from the third clamping structure 33, and then rotates the buckle 325 outward to make the second end of the second buckle body 3254 away from the shell body 31, and then the shell body 31 is pressed against the tube seat 12, and then the operator rotates inward. The operator moves the clamping piece, and then presses the second end of the second clamping body 3254 in the direction of the second clamping axis 3255, so that the second clamping body 3254 undergoes elastic deformation with an increased curvature. When the clamping piece 325 is rotated to abut against the tube seat 12, the operator releases the pressure on the second clamping body 3254, and the second clamping body 3254 is reset. The third clamping block 3256 is able to be clamped together with the third clamping structure 33. At this time, the fourth clamping block 3257 is also clamped together with the first clamping structure 13, thereby realizing the connection between the shell 30 and the tube seat 12. When it is necessary to unlock the relative position of the core seat 22 and the tube seat 12, the operator only needs to press the second end of the second snap body 3254 in the direction of the second snap shaft 3255 again to make the second snap body 3254 undergo elastic deformation with an increased curvature, thereby disengaging the third clamping block 3256 from the third clamping structure 33, and then rotate the clamping piece outward to disengage the fourth clamping block 3257 from the first clamping structure 13. Then the operator can pull the shell 30 to remove the needle core 21 from the needle tube 11. During the operation, only pressing operation is required, which is convenient and labor-saving, and can realize the rapid separation of the needle core 21 and the needle tube 11, thereby improving the reliability of the operation.

[0084] Optional, see Fig. 9 In order to facilitate the operator to press the second buckle body 3254, the outer surface of the second buckle body 3254 may also be provided with an operating convex ridge 3258, and the operating convex ridge 3258 is close to the free end of the second buckle body 3254. During operation, the operator can press the operating convex ridge 3258 to cause the second buckle body 3254 to undergo elastic deformation with an increased curvature.

[0085] Optional, see Fig.11 The third clamping structure 33 is a first slot 331 opened on the slot wall of the avoidance slot 304 . When the third clamping block 3256 is inserted into the first slot 331 , it can be clamped with the third clamping structure 33 .

[0086] Optional, see Fig.11The groove wall of the first slot 331 may be provided with a second slot 332 that passes through the peripheral side wall of the shell body 31. Correspondingly, the extending end of the third clamping block 3256 has a bent portion 3256a. When the third clamping block 3256 is clamped to the third clamping structure 33, the bent portion 3256a is clamped into the second slot 332.

[0087] Optional, see Fig.10 and Fig.12 The fourth clamping block 3257 is provided with a clamping groove 3259, and the extending direction of the clamping groove 3259 is the direction from the first end to the second end of the second clamping body. The first clamping structure 13 is correspondingly a convex strip 134 protruding from the side wall of the tube seat 12. When the fourth clamping block 3257 is clamped to the first clamping structure 13, the convex strip 134 is inserted into the clamping groove 3259 to limit the axial movement of the shell 30 along the tube seat 12.

[0088] In other embodiments, the fourth clamping block 3257 may be a protruding strip 134 , and the first clamping structure 13 may be a clamping groove 3259 , which is not limited here.

[0089] The above description is only a preferred embodiment of the utility model, and only specifically describes the technical principle of the utility model. These descriptions are only for explaining the principle of the utility model and cannot be interpreted as limiting the protection scope of the utility model in any way. Based on the explanation here, any modification, equivalent replacement and improvement made within the spirit and principle of the utility model, and other specific implementation methods of the utility model that can be associated with the technicians in this field without creative labor, should be included in the protection scope of the utility model.

Claims

1. A coaxial biopsy needle, characterized in that: include: The external component comprises a needle tube, a tube seat connected to the proximal end of the needle tube, and a first clamping structure arranged on the tube seat; An internal component, comprising a needle core inserted into the needle tube and a core seat connected to the proximal end of the needle core, wherein the core seat abuts against the tube seat; The shell includes a shell body and a second clamping structure arranged on the shell body, and the first clamping structure and the second clamping structure can be clamped with each other; wherein, when the shell body is sleeved outside the core seat and abuts against the tube seat, the first clamping structure and the second clamping structure are clamped, and the shell body locks the relative position of the core seat and the tube seat; when the shell body is away from the tube seat, the first clamping structure and the second clamping structure are disengaged, and the relative position of the core seat and the tube seat is released.

2. The coaxial biopsy needle according to claim 1, characterized in that: The first clamping structure includes a lug protruding from the side wall of the tube seat, and the second clamping structure includes a clamping part arranged on the shell body and a reset part connected to the shell body, the clamping part can move between a clamping position and an unlocking position, and the reset part can apply a reset force to the clamping part to move toward the clamping position when the clamping part is in the unlocking position, and the lug and the clamping part can be operably matched and clamped.

3. The coaxial biopsy needle according to claim 2, characterized in that: The shell body has a first surface and a second surface facing each other. The shell body is provided with a receiving groove for sleeve-engaging the core seat on the first surface, and an operating hole penetrating to the bottom of the receiving groove on the second surface. The second clamping structure is located in the receiving groove. The side surface of the proximal end of the core seat is convexly provided with an outer edge, and the outer edge is located outside the tube seat and has a first abutment surface facing the tube seat and a second abutment surface facing away from the tube seat. When the lug is clamped with the clamping piece, the bottom of the receiving groove abuts against the second abutment surface to limit the separation of the core seat from the tube seat, and the operating hole avoids part of the core seat in the axial direction of the core seat.

4. The coaxial biopsy needle according to claim 3, characterized in that: The clamping member has a groove, and the lug is operably matched and clamped with the groove.

5. The coaxial biopsy needle according to claim 4, characterized in that: The clamping part includes a first clamping part, a second clamping part and a third clamping part, the first clamping part and the third clamping part are respectively connected to the two ends of the second clamping part, the first clamping part and the third clamping part face each other and are arranged at intervals, the first clamping part, the second clamping part and the third clamping part are jointly arranged to form the groove, the second clamping part is rotatably connected to the shell, the first clamping part is far away from the operating hole, and the third clamping part is close to the operating hole.

6. The coaxial biopsy needle according to claim 5, characterized in that: The clamping member further includes a rotating shaft connected to a side surface of the second clamping portion, the rotating shaft is close to the third clamping portion, and the reset member is connected to a position of the second clamping portion close to the first clamping portion.

7. The coaxial biopsy needle according to claim 6, characterized in that: When the lug is engaged with the groove, the first abutting surface abuts against a side of the third engaging portion facing away from the first engaging portion.

8. The coaxial biopsy needle according to claim 5 or 6, characterized in that: The lug has a first clamping surface facing away from the first abutting surface and a second clamping surface facing the first abutting surface, the second clamping surface is parallel to the first abutting surface, the first clamping surface is an inclined surface inclined relative to the second clamping surface, and when the lug is clamped in the groove, the first clamping surface and the second clamping surface respectively abut against the first clamping portion and the third clamping portion.

9. The coaxial biopsy needle according to claim 3, characterized in that: The central axis of the operating hole coincides with the central axis of the accommodating groove, and the hole wall of the operating hole protrudes from the groove side wall of the accommodating groove.

10. The coaxial biopsy needle according to claim 9, characterized in that: The core seat is also provided with a pressing protrusion protruding from the second abutting surface and adapted to the operating hole.

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