Loading structure of ejection system and biopsy needle

Abstract

The invention relates to the field of biopsy needles, and discloses a loading structure of an ejection system and a biopsy needle. The loading device comprises a shell, a first ejection assembly, a second ejection assembly and a loading assembly, the first ejection assembly, the second ejection assembly and the loading assembly are connected with the shell in a sliding mode, the loading assembly comprises a pulling key and a pushing piece, one side of the pulling key is inserted into the shell, the other side of the pulling key is located outside the shell to be pulled by an operator, and the pushing piece and the pulling key are connected in an up-down sliding mode and move synchronously. The second ejection assembly is suitable for driving the pushing piece to move upwards and avoiding the first ejection assembly, so that the pushing piece pushes the second ejection assembly to move; and when the pulling key is pulled to move for the second time, the pushing piece falls to the initial position to push the first ejection assembly to move. The size of the biopsy needle is reduced, the comfort degree of the holding rod is improved, operation is facilitated, the structure is ingenious and stable, and the automation degree is high; the effects of automatically puncturing, cutting and storing tissue samples are achieved, the workload of doctors is greatly relieved, and accurate and stable biopsy operation is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the biopsy needle technical field, specifically, it relates to a kind of ejection system chambering structure and biopsy needle. BACKGROUND

[0002] Biopsy needle is a kind of medical diagnostic instrument, its main purpose is to obtain biopsy sample or aspirate cell from patient's body tissue, so as to carry out detailed pathological examination and diagnosis.Biopsy needle is respectively provided with first ejection system and second ejection system, first ejection system is provided with solid needle tube, second ejection system is provided with hollow needle tube, hollow needle tube is sleeved on solid needle tube, solid needle tube end is provided with a recess, as the space of cutting sample storage.Present biopsy needle is provided with first trigger key and second trigger key respectively connected with first ejection system and second ejection system, when sampling, operator needs to press first trigger key and second trigger key in sequence first, to drive first ejection system and second ejection system chambering for energy storage state;Afterwards, press the trigger button, first ejection system will first drive solid needle tube to insert into sample tissue position, and tissue sample will fill in recess;Second ejection system will then drive hollow needle tube to insert into sample tissue and cover the opening of recess, so that tissue sample remains in recess.

[0003] However, in the above structure, in order to prevent operator from pressing first trigger key and second trigger key at the same time when chambering, first trigger key and second trigger key will be set larger, which leads to the size of entire biopsy needle being larger, affects grip feeling, and is not conducive to operation. SUMMARY

[0004] To solve at least one aspect of the above problem, the present application first provides a kind of ejection system chambering structure, including shell, first ejection component and second ejection component with the sliding connection of the shell, and chambering component, the first ejection component and the second ejection component are located in the shell interior and the sliding direction is consistent, the chambering component includes trigger key and pusher, one side of the trigger key is inserted in the shell, the other side is located in the shell outside to be triggered by operator, when the trigger key is not triggered, the trigger key can be automatically reset to initial position;The pusher is connected with the trigger key and slides up and down and moves synchronously in front and back;Second ejection component is located between the pusher and the first ejection component;The second ejection component is provided with direction-changing portion suitable for abutting with the pusher and sliding, when the pusher is not in abutment with the direction-changing portion, the pusher remains in original position;The first limit part and the second limit part are spaced apart in the shell;

[0005] During sampling, when the detent key is pulled for the first time to move backward, the detent key drives the pushing member to move backward synchronously until the pushing member abuts against the reversing portion, and the detent key continues to move, and the pushing member abuts and slides relative to the reversing portion to realize the pushing member moving upward relative to the detent key, so that the pushing member avoids the first ejection assembly, and at the same time, the pushing member can push the second ejection assembly to the second limit portion for limiting; after releasing the detent key at this time, the detent key drives the pushing member to automatically return to the initial position, and the pushing member falls and returns to the original position; when the detent key is pulled for the second time to move backward, the detent key drives the pushing member to move backward synchronously, and the pushing member pushes the first ejection assembly to the first limit portion for limiting, thereby completing the loading action.

[0006] Optionally, a reset elastic member is connected between the trigger button and the pushing member, and the reset elastic member is suitable for driving the pushing member to move in a direction away from the trigger button and reset to an initial position.

[0007] Optionally, the second ejection assembly includes a cutting needle tube seat, a hollow needle tube and an energy storage elastic member, one end of the hollow needle tube is fixedly connected to the cutting needle tube seat, and the other end is located outside the shell, and the energy storage elastic member is located on the side of the cutting needle tube seat close to the first ejection assembly, so as to be suitable for driving the cutting needle tube seat to move in a direction away from the first ejection assembly.

[0008] Optionally, a mating protrusion is fixedly provided on the top of the cutting needle tube seat, and a through hole is provided on the side of the mating protrusion close to the first ejection component, the through hole passes through the mating protrusion, and the side of the first ejection component close to the cutting needle tube seat is suitable for being inserted into the through hole; the cutting needle tube seat is suitable for driving the pushing member to move upward so that the pushing member is located above the first ejection component in the through hole, and abuts against the side of the mating protrusion away from the first ejection component to push the cutting needle tube seat to move.

[0009] Optionally, the reversing portion is located on the top of the cutting needle tube seat.

[0010] Optionally, the first ejection assembly includes a core liner seat, an extension plate, a solid needle and an elastic driving member, one end of the extension plate is fixedly connected to the core liner seat, and the other end is inserted into the through hole, one end of the solid needle is fixedly connected to the core liner seat, and the other end is inserted into the hollow needle tube and located outside the outer shell; the elastic driving member is located on the side of the core liner seat away from the second ejection assembly, so as to be suitable for driving the core liner seat to move toward the direction close to the second ejection assembly.

[0011] Optionally, a clearance groove is provided on the extension plate, and when the pushing member pushes the cutting needle tube seat to move, the reversing portion is adapted to move relative to the extension plate in the clearance groove.

[0012] Optionally, the ejection system loading structure also includes an elastic excitation component, which includes an excitation push rod and an excitation button. The excitation push rod is slidably arranged in the outer shell, and the excitation button is hingedly connected to the excitation push rod, and the excitation button is hingedly connected to the outer shell; when the excitation button is pressed, the excitation button is suitable for driving the excitation push rod to move, so as to first release the clamping limit of the first limiting part on the first ejection component, and then release the clamping limit of the second limiting part on the second ejection component.

[0013] Optionally, an opening is provided at the rear end of the housing, and the excitation push rod extends to the opening so as to be suitable for an operator to press and drive the excitation push rod to move.

[0014] Compared with the prior art, the beneficial technical effects of the present invention are:

[0015] 1. The first ejection assembly and the second ejection assembly are both loaded through the same loading assembly. Compared with two loading assemblies cooperating with the first ejection assembly and the second ejection assembly respectively, the provision of a single loading assembly can reduce the occupied space, reduce the size of the biopsy needle, improve the grip comfort, facilitate operation, and thus improve the accuracy and stability of the operation;

[0016] 2. When the loading assembly is pulled for the first time, the trigger button will drive the pusher to move. When the pusher contacts the cutting needle tube seat, the reversing part will cooperate with the cutting needle tube seat to drive the pusher to automatically rise to avoid the first ejection assembly, and first move the second ejection assembly to load the chamber. No additional manual adjustment is required. When the loading assembly is pulled for the second time, since the second ejection assembly moves to the loading position, the pusher will not rise, but directly contact the extension plate to push the second ejection assembly to move and load the chamber. The structure is ingenious and the cost is low. The entire process only requires depressing the loading assembly twice in succession, which is convenient to operate.

[0017] 3. The upward movement of the push assembly is achieved through cooperation with the cutting needle holder. The purely mechanical structure is relatively stable, making the loading of the first ejection assembly and the second ejection assembly relatively stable.

[0018] 4. The setting of the reset spring ensures that the pusher automatically resets when it does not contact the cutting needle holder, regardless of the direction of the loading assembly during use, so as to ensure the stability of the cooperation between the pusher and the first ejection assembly when loading the gun for the second time;

[0019] 5. The elastic excitation component is provided with two excitation positions, namely, the excitation button and the excitation push rod located at the opening at the rear end of the shell. The operator can select the excitation position that is easy to operate according to the actual situation, which improves the convenience of operation;

[0020] 6. When the excitation push rod is driven to excite the first ejection component and the second ejection component, the first ejection component will be excited first, so that the solid needle is located at the sampling site. Then the second ejection component will be excited, so that the hollow needle tube moves to the sampling site, thereby achieving the effect of automatic puncture, cutting, and storage of tissue samples, greatly reducing the workload of doctors and realizing accurate and stable biopsy operations.

[0021] In addition, the present invention provides a biopsy needle comprising the ejection system loading structure as described above.

[0022] Compared with the prior art, the biopsy needle of the present invention and the above-mentioned ejection system loading structure have the same advantages over the prior art, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a structural diagram of the ejection system loading structure in an embodiment of the present invention;

[0024] Figure 2 An exploded view of the loading structure of the ejection system according to an embodiment of the present invention;

[0025] Figure 3 An exploded view of the second housing and the elastic excitation assembly in an embodiment of the present invention;

[0026] Figure 4 This is a structural diagram of the first ejection assembly in an embodiment of the present invention;

[0027] Figure 5 This is a structural diagram of the second ejection assembly in an embodiment of the present invention;

[0028] Figure 6 This is a structural diagram of a loading assembly in an embodiment of the present invention;

[0029] Figure 7 A cross-sectional view of the coupling state between the loading assembly and the second ejection assembly in an embodiment of the present invention;

[0030] Figure 8 This is a cross-sectional view of the cooperation state between the loading assembly and the first ejection assembly in an embodiment of the present invention.

[0031] Explanation of Reference Numerals: 1. housing; 11. first housing; 111. first limiting portion; 112. second limiting portion; 113. guide plate; 114. first retaining plate; 115. second retaining plate; 12. second housing; 121. sliding groove; 2. first ejection assembly; 21. core seat; 211. first clamping plate; 22. extension plate; 221. clearance groove; 23. solid needle; 24. elastic driving member; 25. mating protrusion; 3. second ejection assembly; 31. cutting needle tube seat; 311. Second clamping plate; 32. Hollow needle tube; 33. Energy storage elastic member; 4. Loading assembly; 41. Trigger button; 42. Push member; 421. Blocking block; 43. Tension spring; 44. Reset elastic member; 45. Matching groove; 46. Inclined plate; 47. Inclined protrusion; 5. Elastic excitation assembly; 51. Excitation push rod; 52. Excitation button; 53. Avoidance slot; 54. First excitation push plate; 55. Second excitation push plate; 56. Waist-shaped hole; 57. Toggle column; 58. Reset spring. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more clearly understood, the following Figures 1-8 This application is described in further detail.

[0033] The drawings of the embodiments of the present invention are provided with a coordinate system XYZ, wherein the positive direction of the X axis represents the right, the negative direction of the X axis represents the left, the positive direction of the Y axis represents the front, the negative direction of the Y axis represents the back, the positive direction of the Z axis represents the top, and the negative direction of the Z axis represents the bottom.

[0034] In the first aspect, the embodiment of the present invention provides a ejection system loading structure, referring to Figure 1 and Figure 2The ejection system cocking structure comprises a shell 1, a first ejection assembly 2 adapted to be in sliding connection with the shell 1, a second ejection assembly 3, a cocking assembly 4 and an elastic activation assembly 5 connected with the shell 1. The first ejection assembly 2 and the second ejection assembly 3 are located inside the shell 1 and have the same sliding direction. The cocking assembly 4 is inserted into the shell 1 on one side and extends through the shell 1 to the top of the shell 1 on the other side for an operator to pull. The sliding direction of the cocking assembly 4 is consistent with the sliding direction of the first ejection assembly 2. When no force is applied to the cocking assembly 4, the cocking assembly 4 is adapted to automatically reset to the initial position. Cocking the cocking assembly 4 twice in succession can make the first ejection assembly 2 and the second ejection assembly 3 cock, respectively. When the cocking assembly 4 is pulled back for the first time, the cocking assembly 4 can form an avoidance for the first ejection assembly 2 and first push the second ejection assembly 3 back to make the second ejection assembly 3 cock. When the cocking assembly 4 is pulled back for the second time, the cocking assembly 4 pushes the first ejection assembly 2 back to make the first ejection assembly 2 cock. When the first ejection assembly 2 and the second ejection assembly 3 need to be activated, the elastic activation assembly 5 is pressed down to drive the elastic activation assembly 5 to move. The elastic activation assembly 5 first drives the first ejection assembly 2 to activate and then drives the second ejection assembly 3 to activate.

[0035] Referring to Figure 1 With Figure 2 The shell 1 comprises a first shell body 11 and a second shell body 12. The first shell body 11 is located below the second shell body 12. The top of the first shell body 11 is open to facilitate the assembly of the first ejection assembly 2, the second ejection assembly 3 and the elastic activation assembly 5 into the first shell body 11. The second shell body 12 is adapted to cover the opening at the top of the first shell body 11. A plurality of clamping plugs are integrally formed on the bottom of the second shell body 12 in a circumferential direction. A plurality of clamping grooves corresponding to the clamping plugs are formed on the circumferential wall of the first shell body 11. The clamping plugs are clamped and connected with the corresponding clamping grooves to connect the first shell body 11 and the second shell body 12. This facilitates assembly and improves production efficiency.

[0036] Referring to Figure 2 With Figure 3 The first limiting portion 111 and the second limiting portion 112 are integrally formed on the bottom of the first shell body 11 in the front-rear direction. The first limiting portion 111 is located rearward of the second limiting portion 112. The first ejection assembly 2 needs to move rearward of the first limiting portion 111 to be clamped and limited when cocking. The second ejection assembly 3 needs to move rearward of the second limiting portion 112 to be clamped and limited when cocking.

[0037] The first limiting part 111 and the second limiting part 112 are preferably inclined protrusions, that is, the first limiting part 111 and the second limiting part 112 are gradually inclined towards the second shell 12 from one side from the front to the back. In this way, when the first ejection assembly 2 moves backward, it can smoothly pass through the first limiting part 111 and be clamped and limited behind the first limiting part 111 to realize the chamber loading; similarly, when the second ejection assembly 3 moves backward, it can smoothly pass through the second limiting part 112 and be clamped and limited behind the second limiting part 112 to realize the chamber loading.

[0038] With reference to Figure 2 With reference to Figure 3 The first shell 11 further has two guide rail plates 113 spaced apart in the left-right direction inside the first shell 11, and the two guide rail plates 113 are integrally formed with the first shell 11. The first ejection assembly 2 and the second ejection assembly 3 are located between the two guide rail plates 113 to realize stable directional sliding.

[0039] With reference to Figures 2 to 4 The first ejection assembly 2 includes a liner seat 21, an extension plate 22, a solid needle 23, and an elastic driving member 24. The liner seat 21 slides between the two guide rail plates 113, the solid needle 23 is inserted into the liner seat 21, and the liner seat 21 is integrally molded with the solid needle 23 to realize stable fixed connection. The solid needle 23 extends forwardly to the first shell 11, and the solid needle 23 passes through the second ejection assembly 3 and then passes out of the first shell 11 to be exposed to the air. The extension plate 22 is located at the top of the liner seat 21, and the extension plate 22 extends towards the second ejection assembly 3 and is inserted and matched with the second ejection assembly 3. The first shell 11 integrally has a first stop plate 114 at the bottom inside the first shell 11, the first stop plate 114 is located behind the liner seat 21, and the liner seat 21 has a first insertion slot on the side close to the first stop plate 114. The elastic driving member 24 is preferably a spring, one end of the elastic driving member 24 is inserted into the first insertion slot, and the other end abuts against the first stop plate 114. The elastic driving member 24 is suitable for driving the liner seat 21 to move towards the second ejection assembly 3. In another embodiment, the elastic driving member 24 can be a wave-shaped elastic sheet.

[0040] With reference to Figures 2 to 7The core holder 21 is spaced apart from the bottom of the first shell 11. A first clipping plate 211 is integrally formed at the bottom of the core holder 21. The first clipping plate 211 is tilted, that is, the first clipping plate 211 gradually extends downward along the direction in which the core holder 21 moves forward. When the core holder 21 is driven to move backward, the second shell 12 presses down on the core holder 21 to prevent it from moving upward. When the first clipping plate 211 contacts the first limiting portion 111, the first clipping plate 211 is squeezed and moves upward, deforming. When the first clipping plate 211 passes through the first limiting portion 111 and is located behind the first limiting portion 111, the first clipping plate 211 automatically returns to its original shape and abuts the rear side of the first limiting portion 111, achieving clipping and limiting, and thus completing the loading action. At this time, the elastic driving member 24 is in a compressed state.

[0041] A first buffer is installed inside the first shell 11 . The first buffer is made of rubber. When the core liner seat 21 is ejected forward into position, the core liner seat 21 will collide with the first buffer to be buffered.

[0042] A storage groove is provided on the outer peripheral wall of the solid needle 23 near its front end. When the liner core seat 21 is activated (i.e., the first clamping plate 211 and the first limiting portion 111 are released from the clamping and limiting relationship), the solid needle 23 can move forward under the action of the elastic driving member 24 to puncture the tissue where sampling is required, and the sample tissue will fill the storage groove.

[0043] Reference Figures 2 to 5 The second ejection assembly 3 is located in front of the first ejection assembly 2 , and the second ejection assembly 3 is spaced apart from the liner core seat 21 , so that the second ejection assembly 3 has enough moving space when moving backward and can cooperate with the second limiting portion 112 .

[0044] The second ejection assembly 3 includes a cutting needle tube seat 31, a hollow needle tube 32 and an energy storage elastic member 33. The cutting needle tube seat 31 slides between the two guide plates 113, and the hollow needle tube 32 is inserted into the cutting needle tube seat 31, and is injection-molded together with the cutting needle tube seat 31 during the injection molding of the cutting needle tube seat 31 to achieve a stable fixed connection. The hollow needle tube 32 extends to the front of the first shell 11, and the front end of the hollow needle tube 32 passes through the first shell 11 and is exposed to the air. The hollow needle tube 32 is sleeved on the solid needle 23. A second retaining plate 115 is integrally formed at the bottom of the interior of the first shell 11. The second retaining plate 115 is located in front of the first retaining plate 114 and is spaced apart, and the second retaining plate 115 is located behind the cutting needle tube seat 31, and the solid needle 23 passes through the second retaining plate 115. A second slot is defined on the side of the cutting needle holder 31 near the second retaining plate 115. In this embodiment, the energy-storage elastic member 33 is preferably a spring. One end of the energy-storage elastic member 33 is inserted into the second slot; the other end abuts the second retaining plate 115. The energy-storage elastic member 33 is adapted to propel the cutting needle holder 31 forward. In another embodiment, the energy-storage elastic member 33 may be a wavy spring.

[0045] Reference Figures 2 to 7 The cutting needle tube seat 31 is spaced apart from the bottom of the first housing 11. A second clipping plate 311 is integrally formed at the bottom of the cutting needle tube seat 31. The second clipping plate 311 is arranged at an angle, that is, the second clipping plate 311 gradually extends downward along the direction of the cutting needle tube seat 31's forward movement. When the cutting needle tube seat 31 is driven to move backward, the second housing 12 presses the cutting needle tube seat 31 downward to prevent it from moving upward. When the second clipping plate 311 contacts the second limiting portion 112, the second clipping plate 311 is squeezed and moves upward, deforming. When the second clipping plate 311 passes through the second limiting portion 112 and is located behind the second limiting portion 112, the second clipping plate 311 automatically returns to its original shape and abuts the rear side of the second limiting portion 112, achieving clipping and limiting, and completing the loading action. At this time, the energy storage elastic member 33 is in a compressed state.

[0046] A second buffer is installed inside the first shell 11. The second buffer is made of rubber. When the cutting needle tube seat 31 is ejected forward into position, the front side of the cutting needle tube seat 31 will hit the second buffer to be buffered.

[0047] Since the liner core seat 21 is first stimulated to puncture the sampling tissue, when the cutting needle tube seat 31 is stimulated (that is, the second connecting plate and the second limiting portion 112 are released from the clamping limiting relationship), the hollow needle tube 32 can move forward under the action of the energy storage elastic member 33 to puncture the tissue to be sampled, and block the storage slot to achieve cutting, and store the sample tissue in the storage slot.

[0048] Reference Figures 2 to 8A mating protrusion 25 is fixedly mounted on the top of the cutting needle holder 31. A through-hole is formed on the side of the mating protrusion 25 near the first ejection assembly 2. The through-hole extends through the mating protrusion 25 in the front-to-back direction, and the extension plate 22 is inserted into the through-hole. When the loading assembly 4 pushes the cutting needle holder 31 to move, the loading assembly 4, located above the extension plate 22, contacts the mating protrusion 25, thereby pushing the cutting needle holder 31 to move. During this process, the core holder 21 remains stationary. When the cutting needle holder 31 is in the loaded state, the loading assembly 4 is triggered again, causing the loading assembly 4 to abut against the end of the extension plate 22 away from the core holder 21, thereby driving the core holder 21 to move.

[0049] The loading assembly 4 is slidably mounted on the second housing 12 and includes a trigger 41 and a pusher 42. One side of the trigger 41 is inserted into the first housing 11, and the other side is located outside the outer shell 1 for the operator to trigger. When no force is applied to the trigger 41, the trigger 41 is adapted to automatically return to its initial position. The pusher 42 is located within the first housing 11 and is slidably connected to and moves synchronously with the trigger 41. A tension spring 43 is provided within the second housing 12, located in front of the trigger 41. One side of the tension spring 43 is hooked to the interior of the second housing 12, and the other side is hooked to the trigger 41. Therefore, when no force is applied to the trigger 41, the tension spring 43 drives the trigger 41 forward to its initial position.

[0050] Reference Figures 2 to 8 Specifically, a sliding groove 121 is defined at the top of the second housing 12 (i.e., the side of the second housing 12 facing away from the first housing 11). The sliding groove 121 extends in the front-to-back direction and communicates with the interior of the first housing 11. Two symmetrically formed, left-to-right, snap-fit ​​mounting plates are integrally formed at the bottom of the trigger key 41. These two snap-fit ​​mounting plates are inserted into the sliding groove 121 to achieve a snap-fit ​​connection with the second housing 12, allowing the trigger key 41 to move along the direction in which the sliding groove 121 extends.

[0051] The top of the pusher 42 is slidably inserted into the trigger key 41, and the bottom of the pusher 42 is inserted into the interior of the second shell 12. The left and right outer walls of the pusher 42 are both integrally formed with a stopper 421. The distance between the two stoppers 421 is greater than the width of the sliding groove 121 (the length in the left-right direction). The bottoms of the two stoppers 421 abut against the top of the second shell 12, so that the stoppers 421 are not likely to fall into the interior of the second shell 12. A reset elastic member 44 is provided at the top of the pusher 42. In this embodiment, the reset elastic member 44 is preferably a spring. In another embodiment, the reset elastic member 44 is a V-shaped spring. The top of the reset elastic member 44 abuts against the cavity wall inside the trigger key 41, thereby allowing the pusher 42 to automatically descend to its original position (that is, the height at which the bottom of the pusher 42 is located when the stopper 421 abuts against the top of the second shell 12) after moving upward without being subjected to force.

[0052] Reference Figures 2 to 8 The rear side of the pusher 42 is provided with a mating groove 45. When the pusher 42 drives the cutting needle tube seat 31 backward, the upper front side of the mating protrusion 25 is inserted into the mating groove 45. When the pusher 42 drives the liner core seat 21 backward, the front end of the extension plate 22 is inserted into the mating groove 45, thereby improving the stability of the mating during pushing. In another embodiment, the mating groove 45 can be omitted, and the pusher 42 can directly abut the mating protrusion 25 or the front end of the extension plate 22.

[0053] A reversing portion is fixedly provided at the bottom of the pusher 42 and the top of the cutting needle tube seat 31. The reversing portion at the bottom of the pusher 42 is a tilted plate 46, while the reversing portion at the top of the cutting needle tube seat 31 is a tilted protrusion 47. The tilted plate 46 extends gradually downward in the direction of forward movement of the pusher 42. The tilted protrusions 47 are located in front of the mating protrusions 25 and are spaced apart. The tilted protrusions 47 also tilt gradually downward in the direction of forward movement of the pusher 42. The tilted plate 46 and the tilted protrusions 47 cooperate to automatically move the pusher 42 upward. The arrangement of the tilted plate 46 and the tilted protrusions 47 improves the smoothness of the upward movement of the pusher 42, allowing the tilt angle of the tilted plate 46 to be smaller, and the vertical space occupied by the tilted plate 46 to be smaller. In another embodiment, the inclined plate 46 (reversing portion) may be provided only at the bottom of the pusher 42; or the inclined protrusion 47 (reversing portion) may be provided only at the top of the cutting needle tube seat 31. However, in order to ensure that the pusher 42 avoids the extension plate 22, the inclination angle of the reversing portion should be larger.

[0054] Reference Figures 2 to 8 When the trigger button 41 is first pressed and the pusher 42 moves backward, the inclined plate 46 contacts the inclined surface of the inclined protrusion 47. At this time, the elastic force exerted by the energy storage elastic member 33 on the cutting needle tube seat 31 is greater than the elastic force exerted by the reset elastic member 44 on the pusher 42. Therefore, the inclined plate 46 moves to the highest point of the inclined protrusion 47, thereby driving the pusher 42 upward. The edge of the front end of the top of the mating protrusion 25 is provided with a chamfered inclined surface. When the inclined plate 46 moves to the highest point of the inclined protrusion 47, the notch of the mating groove 45 contacts the chamfered inclined surface, continuing to drive the trigger button 41 to drive the pusher 42 backward, so that the upper front side of the mating protrusion 25 is inserted into the mating groove 45, while the inclined plate 46 is still located above the inclined protrusion 47, thereby pushing the cutting needle tube seat 31 backward. During the above process, the inclined plate 46 will be located above the extension plate 22 and deform and contact the extension plate 22. The elastic force applied by the elastic driving member 24 to the liner core seat 21 is greater than the friction force applied by the inclined plate 46 to the extension plate 22, so the liner core seat 21 will not move.

[0055] The bottom of the pushing piece 42 is provided with an inclined plate 46, and the top of the cutting needle tube seat 31 is provided with an inclined protrusion 47, so that the upper and lower sides of the extension plate 22 are both provided with a let-in groove 221. When the pushing piece 42 pushes the cutting needle tube seat 31 to move backward, the inclined plate 46 moves in the let-in groove 221 above the extension plate 22, so that the space in the second shell 12 is reduced. The inclined protrusion 47 moves in the let-in groove 221 below the extension plate 22 to form an avoidance, so that the extension plate 22 cannot move synchronously due to the inclined protrusion 47, and the space in the second shell 12 can be reduced, so that the size of the whole shell 1 is reduced. If only the inclined plate 46 or the inclined protrusion 47 is arranged, the let-in groove 221 needs to be arranged on the corresponding side of the extension plate 22.

[0056] With reference to Figures 2 to 8 When the pushing piece 42 drives the cutting needle tube seat 31 to move backward, and the second clamping plate 311 is clamped and limited behind the second limiting portion 112, the whole second ejection assembly 3 is limited to be in a cocking state. At this time, the trigger key 41 is released, and the trigger key 41 and the pushing piece 42 are automatically moved forward and reset under the action of the tension spring 43, and the pushing piece 42 is automatically lowered and reset under the action of the reset elastic member 44. Then, the trigger key 41 is triggered again to move backward, at this time, the front end of the extension plate 22 can be directly inserted into the matching groove 45, so that the pushing piece 42 drives the liner core seat 21 to move backward, and drives the first clamping plate 211 to move to be clamped and limited behind the first limiting portion 111, so that the whole first ejection assembly 2 is limited to be in a cocking state.

[0057] With reference to Figures 2 to 6 The elastic excitation assembly 5 includes an excitation push rod 51 and an excitation button 52. The excitation push rod 51 is located in the second shell 12 and between the two guide rail plates 113 to realize directional sliding in the front-back direction. The excitation button 52 is located on the left outer wall of the second shell 12, and the excitation button 52 is hingedly connected with the excitation push rod 51, and the excitation button 52 is hingedly connected with the second shell 12, and one side of the excitation button 52 protrudes out of the second shell 12. When the excitation button 52 is pressed, the excitation button 52 is suitable for driving the excitation push rod 51 to move, so as to first release the clamping and matching relationship between the first limiting portion 111 and the first clamping plate 211, and then release the clamping and matching relationship between the second limiting portion 112 and the second clamping plate 311, so as to first make the solid needle 23 puncture to the sampling tissue position, and then make the hollow needle tube 32 puncture to the sampling tissue position for cutting.

[0058] With reference to Figures 2 to 8The excitation push rod 51 slides on the bottom of the second housing 12. A long avoidance slot 53 is formed on the top of the excitation push rod 51. The first retaining plate 114 and the second retaining plate 115 are inserted into the long avoidance slot 53, thereby enabling the excitation push rod 51 to slide smoothly. The first excitation push plate 54 and the second excitation push plate 55 are integrally formed in the long avoidance slot 53. The first excitation push rod 51 is located between the first limit portion 111 and the first retaining plate 114, and the second excitation push plate 55 is located between the second limit portion 112 and the second retaining plate 115. When the excitation push rod 51 moves forward, the first excitation push plate 54 can drive the first clamping plate 211 to move upward and deform, and then move to above the first limiting portion 111, and then eject forward under the action of the elastic driving member 24; the second excitation push plate 55 can drive the second clamping plate 311 to move upward and deform, and then move to above the second limiting portion 112, and then eject forward under the action of the energy storage elastic member 33.

[0059] Among them, the distance between the first excitation push plate 54 and the first limiting portion 111 is smaller than the distance between the second excitation push plate 55 and the second limiting portion 112, so the excitation push rod 51 can first cause the liner core seat 21 to eject forward so that the solid needle 23 punctures the sampling tissue position, and then drives the cutting needle tube seat 31 to eject forward so that the hollow needle tube 32 punctures the sampling tissue position for cutting.

[0060] Reference Figures 2 to 8 A waist-shaped hole 56 is formed at the top of the trigger push rod 51 near its front end. The length of the waist-shaped hole 56 is the left-right direction of the trigger push rod 51. The trigger button 52 is provided with a rotating shaft on both the upper and lower sides. The two rotating shafts are respectively connected to the first shell 11 and the second shell 12 for rotation and insertion. The trigger button 52 is also integrally formed with a toggle post 57, which is inserted into the waist-shaped hole 56. When the trigger button 52 is pressed, the trigger button 52 rotates, thereby driving the toggle post 57 to swing forward, and the toggle post 57 drives the trigger push rod 51 forward.

[0061] A return spring 58 is provided at the front end of the excitation push rod 51. One end of the return spring 58 abuts against the front end of the excitation push rod 51, and the other end abuts against the front inner wall of the second shell 12. In this way, when no force is applied to the excitation button 52, the return spring 58 can drive the excitation push rod 51 to move backward and automatically reset.

[0062] In addition, the rear end of the second housing 12 is provided with an opening, and the rear end of the excitation push rod 51 is located at the opening and blocks the opening. In this way, the operator can also directly push the excitation push rod 51 forward at the rear end of the second housing 12 to complete the excitation action.

[0063] The principle of the ejection system loading structure of the embodiment of the present application is as follows: when sampling, the first detent button 41 is pulled backward. When the detent button 41 drives the pusher 42 backward, the inclined plate 46 contacts the inclined surface of the inclined protrusion 47. The inclined plate 46 moves to the highest point of the inclined protrusion 47, thereby driving the pusher 42 upward, so that the upper front side of the mating protrusion 25 is inserted into the mating groove 45, while the inclined plate 46 remains above the inclined protrusion 47, thereby pushing the cutting needle tube seat 31 backward. During this process, the inclined plate 46 is located above the extension plate 22 and deforms and contacts the extension plate 22. The elastic force applied by the elastic driving member 24 to the core holder 21 is greater than the friction force applied by the inclined plate 46 to the extension plate 22, so that the core holder 21 does not move. When the pusher 42 drives the cutting needle holder 31 to move backward and the second engaging plate 311 moves to the rear of the second stopper 112 and is engaged and stopped, the entire second ejection assembly 3 is locked into the loaded state. At this point, if the trigger button 41 is released, the trigger button 41 and the pusher 42 automatically move forward and return to their original position under the action of the tension spring 43. Simultaneously, the pusher 42 moves synchronously under the action of the return spring 44 and automatically descends to its original position. Then, the trigger key 41 is pressed again to drive the trigger key 41 to move backward. At this time, the front end of the extension plate 22 can be directly inserted into the matching groove 45, and then the push member 42 drives the liner core seat 21 to move backward, and drives the first clamping plate 211 to move to the rear of the first limit part 111 and be clamped and limited, so that the entire first ejection assembly 2 is limited to a loaded state. At this time, the trigger key 41 is released, and the trigger key 41 and the push member 42 will automatically move forward and reset under the action of the tension spring 43. The push member 42 moves synchronously under the action of the reset elastic member 44 and automatically drops and resets to its original position.

[0064] In a second aspect, another embodiment of the present invention provides a biopsy needle comprising the ejection system loading structure of the first aspect.

[0065] Equivalently, the components included in the "assembly," "mechanism," and "device" of the present disclosure can also be flexibly combined. They can be modularly produced according to actual conditions and assembled as a separate module; or they can be assembled separately to form a module in the present device. The division of the above components in the present disclosure is only one embodiment, for ease of reading, and not to limit the scope of protection of the present disclosure. As long as the above components are included and have the same functions, it should be understood that they are equivalent technical solutions of the present disclosure.

[0066] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure 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 should not be understood as a limitation to the present disclosure.

[0067] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first," "second," etc., may explicitly or implicitly include at least one such feature. Throughout the present disclosure, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0068] In this disclosure, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components, unless otherwise expressly limited. Those skilled in the art will understand the specific meanings of the above terms in this disclosure based on specific circumstances.

[0069] In this disclosure, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0070] It should be noted that when an element is referred to as being “fixed to,” “disposed on,” “fixed on,” or “installed on” another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be “connected to another element,” it may be directly connected to the other element or there may be an intermediate element at the same time. Furthermore, when an element is considered to be “fixedly connected” to another element, the two may be fixed in a detachable connection manner or in a non-detachable connection manner, such as socketing, snap-fitting, integral molding, welding, etc., which can be achieved in traditional technologies and will not be repeated here.

[0071] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0072] The above embodiments merely illustrate several implementations of the present disclosure, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the inventive concept of the present disclosure, and all such variations and improvements fall within the scope of protection of the present disclosure.

Claims

1. An ejection system loading structure, characterized by: The invention comprises a shell (1), a first ejection assembly (2) slidably connected to the shell (1), a second ejection assembly (3) and a chamber assembly (4), wherein the first ejection assembly (2) and the second ejection assembly (3) are located inside the shell (1) and have the same sliding direction, and the chamber assembly (4) comprises a trigger key (41) and a pusher (42), wherein one side of the trigger key (41) is inserted into the shell (1) and the other side is located outside the shell (1) for an operator to trigger, and when the trigger key (41) is not triggered, the trigger key (41) is in a state of being pressed. ) can automatically reset to the initial position; the pushing member (42) is connected to the detent key (41) by sliding up and down and moving synchronously forward and backward; the second ejection assembly (3) is located between the pushing member (42) and the first ejection assembly (2); the second ejection assembly (3) is provided with a reversing portion suitable for sliding against the pushing member (42); when the pushing member (42) does not abut against the reversing portion, the pushing member (42) remains in the original position; a first limiting portion (111) and a second limiting portion (112) are provided in the housing (1) at intervals; During sampling, when the trigger key (41) is pressed for the first time and moves backward, the trigger key (41) drives the push member (42) to move backward synchronously until the push member (42) abuts against the reversing portion, and the trigger key (41) continues to move, and the push member (42) abuts and slides relative to the reversing portion to achieve the upward movement of the push member (42) relative to the trigger key (41), so that the push member (42) avoids the first ejection component (2). At the same time, the push member (42) can move the second ejection component (3) Push to the second limiting portion (112) for limiting; at this time, after releasing the trigger key (41), the trigger key (41) drives the push member (42) to automatically return to the initial position, and at the same time, the push member (42) falls and returns to the original position; when the trigger key (41) is triggered for the second time to move backward, the trigger key (41) drives the push member (42) to move backward synchronously, and the push member (42) pushes the first ejection assembly (2) to the first limiting portion (111) for limiting, completing the loading action.

2. The ejection system loading structure according to claim 1, characterized in that: A reset elastic member (44) is connected between the trigger key (41) and the push member (42), and the reset elastic member (44) is suitable for driving the push member (42) to move in a direction away from the trigger key (41) and reset to an initial position.

3. The ejection system loading structure according to claim 1, characterized in that: The second ejection assembly (3) comprises a cutting needle tube seat (31), a hollow needle tube (32) and an energy storage elastic member (33); one end of the hollow needle tube (32) is fixedly connected to the cutting needle tube seat (31), and the other end is located outside the housing (1); the energy storage elastic member (33) is located on a side of the cutting needle tube seat (31) close to the first ejection assembly (2), so as to be suitable for driving the cutting needle tube seat (31) to move in a direction away from the first ejection assembly (2).

4. The ejection system loading structure according to claim 3, characterized in that: A matching protrusion (25) is fixedly provided on the top of the cutting needle tube seat (31), and a through hole is provided on the side of the matching protrusion (25) close to the first ejection component (2), and the through hole passes through the matching protrusion (25), and the side of the first ejection component (2) close to the cutting needle tube seat (31) is suitable for being inserted into the through hole; the cutting needle tube seat (31) is suitable for driving the pushing member (42) to move upward so that the pushing member (42) is located above the first ejection component (2) in the through hole and abuts against the side of the matching protrusion (25) away from the first ejection component (2) to push the cutting needle tube seat (31) to move.

5. The ejection system loading structure according to claim 3, characterized in that: The reversing portion is located on the top of the cutting needle tube seat (31).

6. The ejection system loading structure according to claim 4, characterized in that: The first ejection assembly (2) comprises a core liner seat (21), an extension plate (22), a solid needle (23) and an elastic driving member (24); one end of the extension plate (22) is fixedly connected to the core liner seat (21), and the other end is inserted into the penetration hole; one end of the solid needle (23) is fixedly connected to the core liner seat (21), and the other end is inserted into the hollow needle tube (32) and located outside the shell (1); the elastic driving member (24) is located on a side of the core liner seat (21) away from the second ejection assembly (3), so as to be suitable for driving the core liner seat (21) to move in a direction close to the second ejection assembly (3).

7. The ejection system loading structure according to claim 6, characterized in that: The extension plate (22) is provided with a clearance groove (221), and when the pushing member (42) pushes the cutting needle tube seat (31) to move, the reversing portion is adapted to move relative to the extension plate (22) in the clearance groove (221).

8. The ejection system loading structure according to any one of claims 1 to 7, characterized in that: The invention also includes an elastic excitation component (5), wherein the elastic excitation component (5) includes an excitation push rod (51) and an excitation button (52), wherein the excitation push rod (51) is slidably arranged in the housing (1), and the excitation button (52) is hingedly connected to the excitation push rod (51), and the excitation button (52) is hingedly connected to the housing (1); when the excitation button (52) is pressed, the excitation button (52) is suitable for driving the excitation push rod (51) to move, so as to first release the clamping limit of the first limiting portion (111) on the first ejection component (2), and then release the clamping limit of the second limiting portion (112) on the second ejection component (3).

9. The ejection system loading structure according to claim 8, characterized in that: An opening is provided at the rear end of the housing (1), and the excitation push rod (51) extends to the opening, so as to be suitable for an operator to press and drive the excitation push rod (51) to move.

10. A biopsy needle, characterized in that: It comprises the ejection system loading structure according to any one of claims 1 to 9.

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