Particle pusher

Abstract

The application relates to a particle pusher and relates to the technical field of medical devices, which comprises a main handle and a biopsy needle joint coaxially connected, an axial installation through hole is arranged in the biopsy needle joint and is used for inserting a particle needle. The pusher comprises a first limiting mechanism and a second limiting mechanism. The first limiting mechanism comprises a pressing piece, a first limiting piece and an elastic rubber part. The pressing piece is swingably connected to the outer wall of the biopsy needle joint through the elastic rubber part. The dislocation and abutment state of the first limiting piece relative to the installation through hole is controlled by pressing the pressing piece and resetting. The second limiting mechanism is arranged in the biopsy needle joint and is in transmission cooperation with the first limiting mechanism. When the first limiting piece and the particle needle abut in the first direction, the second limiting mechanism automatically abuts the particle needle in the second direction which is not parallel to the first direction, so that bidirectional limiting is formed. The structure has the functions of automatic unlocking and resetting during the particle needle insertion and positioning process, is beneficial to stabilizing the position of the needle body and improving the operation precision.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and more particularly to a particle pusher. Background Technology

[0002] Currently, particle implantation needles, as a key adjunct tool in tumor treatment, can precisely implant radioactive particles into tumor tissue. These particles continuously release low-energy rays to kill tumor cells, thus playing a crucial role in the treatment of solid tumors in the head and neck, chest, abdomen, prostate, and soft tissues. The particle implantation delivery device is the main surgical instrument for achieving precise particle delivery and implantation. Its safety, accuracy, stability, and the smoothness of the intraoperative operation directly affect treatment outcomes and patient compliance.

[0003] Existing particle implantation needles (biopsy needles) are divided into two types: one with a Luer interface on the outside and the other without. In the existing technology, for particle implantation needles without a Luer interface, unstable installation between the particle implantation needle and the particle implantation pusher often occurs. Summary of the Invention

[0004] This application provides a particle pusher to at least partially solve the above-mentioned technical problems.

[0005] To achieve the above objectives, according to a first aspect of this application, a particle pusher is provided, comprising:

[0006] main body handle;

[0007] A biopsy needle connector is coaxially connected to the front end of the main handle, and an axial mounting through hole is provided inside the biopsy needle connector, which is configured to allow the particle needle portion to be inserted.

[0008] The first limiting mechanism includes a pressing member, a first limiting member, and an elastic rubber part. The pressing member is oscillatingly connected to the outer wall of the biopsy needle connector via the elastic rubber part, and the elastic rubber part is located between the front end and the rear end of the pressing member. The first limiting member is located at the front end of the pressing member and at the front end of the mounting through hole. When the rear end of the pressing member is pressed and shifts towards the outer wall of the biopsy needle connector, the first limiting member moves away from the mounting through hole and is misaligned with the mounting through hole. When the particle needle is partially inserted into the mounting through hole and the rear end of the pressing member is no longer pressed, the elastic rubber part elastically resets so that the first limiting member abuts against the particle needle in a first direction.

[0009] The second limiting mechanism is located inside the biopsy needle connector and is in transmission cooperation with the first limiting mechanism; wherein,

[0010] When the first limiting member abuts against the particle needle inserted into the mounting through hole in the first direction, the second limiting mechanism automatically abuts against the particle needle inserted into the mounting through hole in the second direction, and the first direction and the second direction are not parallel to each other.

[0011] When the first limiting member is in a position that is misaligned with the mounting through hole, the second limiting mechanism automatically becomes spaced apart from the mounting through hole.

[0012] In one embodiment, the second limiting mechanism includes an abutment member, a transmission assembly, and a second limiting member; wherein,

[0013] The biopsy needle connector has an insertion channel located below the rear end of the pressing member. The length direction of the insertion channel is perpendicular to the mounting through hole, and a portion of the abutment member is movably inserted into the insertion channel.

[0014] The biopsy needle connector has a transmission cavity communicating with the insertion channel. The transmission assembly is movably disposed in the transmission cavity, and the first end of the transmission assembly is in transmission engagement with the abutment member.

[0015] A movable tube is provided in the transmission cavity near the front opening of the mounting through hole. A movable channel is opened in the movable tube and is perpendicular to the mounting through hole. The length direction of the movable channel is perpendicular to the length direction of the insertion channel. The second limiting member is slidably disposed in the movable channel. A strip hole is opened on the side wall of the movable tube along the length direction of the movable channel. The second end of the transmission assembly passes through the strip hole and is connected to the second limiting member.

[0016] When the rear end of the pressing member is offset toward the outer wall of the biopsy needle connector, the rear end of the pressing member pushes the abutment member into the insertion channel, thereby driving the transmission assembly to move the second limiting member away from the mounting through hole in the moving channel.

[0017] As the rear end of the pressing member shifts away from the outer wall of the biopsy needle connector, the abutment member automatically moves outward from the insertion channel, while the second limiting member automatically moves within the moving channel toward the mounting through hole to abut against the particle needle inserted into the mounting through hole in the second direction.

[0018] In one embodiment, the abutting member includes an abutting post and an abutting block. The abutting post is movably inserted into an insertion channel, and the abutting block is disposed at the end of the abutting post located outside the insertion channel, and the abutting block is used to slide against the rear end of the pressing member.

[0019] In one embodiment, a side groove is formed on the side wall of the insertion channel in the same direction, and a limiting block is provided on the abutment post. The limiting block extends into the side groove and slides with the side groove. A first spring is connected in the side groove between the limiting block and the end wall of the side groove. The first spring always has the tendency to push the abutment post outward along the length direction of the insertion channel.

[0020] In one embodiment, the second limiting member includes a movable block and a limiting rubber block. The movable block is slidably disposed in the movable channel, and the limiting rubber block is disposed on the side of the movable block facing the mounting through hole. The second end of the transmission component is connected to the movable block.

[0021] In one embodiment, the wall surface of the limiting rubber block facing away from the moving block is an arc-shaped surface, and the curvature of the arc-shaped surface is consistent with the curvature of the outer wall of the particle needle and the curvature of the inner wall of the mounting through hole.

[0022] In one embodiment, a second spring is provided inside the movable tube. The first end of the second spring is connected to the inner end wall of the movable tube away from the mounting through hole, and the second end of the second spring is connected to the wall surface of the movable block away from the mounting through hole. The second spring always has the tendency to push the movable block along the length direction of the movable channel toward the side closer to the mounting through hole.

[0023] In one embodiment, the transmission assembly includes a first transmission rod, a second transmission rod, and a telescopic guide member, wherein,

[0024] The biopsy needle connector has a transmission channel, one end of which is perpendicularly connected to the insertion hole and the other end is connected to the transmission cavity. The first transmission rod is slidably inserted into the transmission channel. The rod end of the first transmission rod near the insertion hole has a first sliding slope. The end of the abutment post away from the abutment block has a second sliding slope. The first sliding slope and the second sliding slope slide against each other.

[0025] The second transmission rod is vertically connected to the end of the first transmission rod away from the insertion hole, and the end of the second transmission rod away from the first transmission rod passes through the strip hole and is connected to the second limiting member;

[0026] The transmission cavity is provided with a mounting plate, and the telescopic guide is telescopically disposed between the mounting plate and the second transmission rod, and the telescopic direction of the telescopic guide is parallel to the moving direction of the second limiting member.

[0027] In one embodiment, a plurality of telescopic guide members are provided at intervals between the mounting plate and the second transmission rod. The telescopic guide members include a sliding rod and a sliding cylinder. The sliding cylinder is mounted on the mounting plate, the sliding rod is connected to the second transmission rod, and the sliding rod is axially inserted into the sliding cylinder.

[0028] In one embodiment, the end of the first limiting member away from the pressing member is provided with a limiting groove, the limiting groove being used to abut against the particle needle in a first direction;

[0029] When the first spring is in its natural state, the abutment block is in contact with the rear wall of the pressing member, and the limiting groove is coaxially aligned with the mounting through hole.

[0030] The beneficial effects of the embodiments of this application are as follows:

[0031] 1. By establishing a bidirectional limiting linkage structure between the main handle and the biopsy needle connector, dynamic limiting and automatic reset control can be provided during the insertion and positioning of the particle needle, resulting in high operational stability and reliable needle positioning. Through the coordinated design of the pressing component, the first limiting component, and the elastic rubber part in the first limiting mechanism, when the operator presses the pressing component, the first limiting component can shift away from the mounting through-hole, allowing the particle needle to be smoothly inserted; after releasing the pressure, the elastic rebound of the elastic rubber part resets the first limiting component, causing it to abut against the particle needle in the first direction. Simultaneously, the second limiting mechanism forms a transmission relationship with the first limiting mechanism, automatically driving the second limiting component to abut against the particle needle in a second direction different from the first direction when the first limiting component resets, thus forming a multi-directional limiting cooperation structure. Through this synergistic design of bidirectional limiting and elastic reset, the stability of the particle needle in the mounting through-hole is significantly enhanced, reducing the risk of needle wobbling and displacement to a certain extent, thus improving the safety and accuracy of surgical operations.

[0032] 2. By constructing a mechanical linkage system that allows for transmission and rebound between the pressing component, the abutting component, the transmission assembly, the first limiting component, and the second limiting component, the operator can simultaneously release the constraint of the limiting structure on the particle needle during the pressing action, allowing the particle needle to be smoothly inserted into the mounting through hole; when the pressing force is released, the system re-establishes the limiting contact relationship under the rebound action of the multi-stage springs, so that the particle needle remains stably positioned after being pushed, thereby reducing the risk of particle needle shaking, deviation, or jamming to a certain extent, and ensuring the smoothness and safety of the pushing process;

[0033] 3. By arranging the moving tube and the first limiting member adjacent to each other at the point where the particle needle abuts in the first direction, the second limiting member forms an adjacent action area at the point where it abuts the particle needle in the second direction and at the point where the first limiting member abuts. Since the two limiting directions are not parallel, if the points of action are far apart, the overhanging section of the particle needle after insertion into the mounting hole will bear dispersed and mutually offset lateral forces, thereby increasing the bending moment and causing a significant deflection tendency. In this solution, the force-bearing positions of the two limiting mechanisms are adjacent, so that the lateral force is concentrated in a relatively compact area, reducing the force span of the particle needle, reducing the risk of bending or offset of the particle needle in the mounting hole due to the difference in force distribution in multiple directions, and enhancing the attitude stability of the particle needle under multi-directional constraints. In addition, the adjacent arrangement of the moving tube also makes the response of the second limiting member more synchronized. After the first limiting member resets, the transmission component can quickly drive the second limiting member back to the corresponding limiting position, so that the two limiting directions maintain coordination in structural action. This structural layout is beneficial to improving the stability and positioning accuracy of the particle needle during the insertion and limiting processes, enabling it to maintain a more reliable controlled state under complex stress conditions. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0036] Figure 1 This is a schematic diagram of the overall structure of the particle pusher in the embodiments of this application;

[0037] Figure 2 This is a partial schematic diagram of the particle pusher in the embodiments of this application;

[0038] Figure 3 This is a first partial cross-sectional view of the particle pusher in the embodiments of this application;

[0039] Figure 4 This is a second partial cross-sectional view of the particle pusher in the embodiments of this application;

[0040] Figure 5 This is a structural schematic diagram of the second limiting mechanism used to separately demonstrate the implementation of this application;

[0041] Figure 6This is a structural schematic diagram of the telescopic guide used to separately demonstrate the embodiment of this application.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1. Main handle;

[0044] 2. Biopsy needle connector; 21. Mounting through hole; 22. Insertion channel; 23. Transmission cavity; 24. Side groove; 25. Transmission channel;

[0045] 3. Particle needles;

[0046] 4. First limiting mechanism; 41. Pressing component; 42. First limiting component; 421. Limiting groove; 43. Elastic rubber part;

[0047] 5. Second limiting mechanism; 51. Abutting component; 511. Abutting post; 5111. Second sliding inclined surface; 512. Abutting block; 52. Transmission assembly; 521. First transmission rod; 5211. First sliding inclined surface; 522. Second transmission rod; 523. Telescopic guide component; 5231. Sliding rod; 5232. Sliding cylinder; 53. Second limiting component; 531. Moving block; 532. Limiting rubber block; 5321. Arc-shaped surface;

[0048] 6. Moving tube body; 61. Moving channel; 62. Slot hole;

[0049] 7. Limiting block; 71. First spring;

[0050] 8. The second spring;

[0051] 9. Mounting plate; Detailed Implementation

[0052] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0053] This application provides a particle pusher; please refer to [link / reference]. Figure 1 and Figure 2 The particle pusher includes a main handle 1, a biopsy needle connector 2, a first limiting mechanism 4, and a second limiting mechanism 5. The biopsy needle connector 2 is coaxially connected to the front end of the main handle 1, and an axially formed mounting through hole 21 is provided inside the biopsy needle connector 2. The mounting through hole 21 is configured to allow partial insertion of the particle needle 3; specifically, the front opening of the mounting through hole 21 corresponds to the insertion direction of the particle needle 3, enabling the particle needle 3 to be stably advanced in the axial direction.

[0054] Furthermore, the first limiting mechanism 4 includes a pressing member 41, a first limiting member 42, and an elastic rubber part 43. The pressing member 41 is oscillatingly connected to the outer wall of the biopsy needle connector 2 via the elastic rubber part 43, and the elastic rubber part 43 is located between the front end and the rear end of the pressing member 41, and has good extensibility and elastic recovery performance. The first limiting member 42 is located at the front end of the pressing member 41 and at the front end of the mounting through hole 21. When the rear end of the pressing member 41 is pressed and shifts towards the outer wall of the biopsy needle connector 2, the first limiting member 42 moves away from the mounting through hole 21 and is misaligned with the mounting through hole 21. When the particle needle 3 is partially inserted into the mounting through hole 21 and the rear end of the pressing member 41 is no longer pressed, the elastic rubber part 43 elastically resets so that the first limiting member 42 abuts against the particle needle 3 in the first direction.

[0055] Furthermore, the second limiting mechanism 5 is disposed within the biopsy needle connector 2, and the second limiting mechanism 5 is in transmission cooperation with the first limiting mechanism 4. Specifically, when the first limiting member 42 abuts against the particle needle 3 inserted into the mounting through hole 21 in the first direction, the second limiting mechanism 5 automatically abuts against the particle needle 3 inserted into the mounting through hole 21 in the second direction, and the first direction and the second direction are not parallel to each other; when the first limiting member 42 is in a position that is misaligned with the mounting through hole 21, the second limiting mechanism 5 automatically and intermittently distributes itself with the particle needle 3 inserted into the mounting through hole 21.

[0056] It is understandable that when the operator presses the rear end of the pressing member 41 with their thumb, the pressing member 41 swings at a certain angle around the elastic rubber part 43, and the front end of the pressing member 41 moves away from the mounting through hole 21, thereby driving the first limiting member 42 at the front end to move towards a position that does not obstruct the opening of the mounting through hole 21. During this process, the first limiting member 42 is misaligned relative to the front end of the mounting through hole 21, that is, the axial direction of the mounting through hole 21 no longer coincides with the first limiting member 42, and the particle needle 3 can be inserted along the direction of the mounting through hole 21 without interference. At the same time, there is a transmission cooperation relationship between the second limiting mechanism 5 and the first limiting mechanism 4. When the rear end of the pressing member 41 is pressed down, the second limiting mechanism 5 is simultaneously offset away from the mounting through hole 21, so that it is in a position that is spaced apart from the mounting through hole 21. That is, the second limiting mechanism 5 will not contact the particle needle 3 during the insertion stage, so that the particle needle 3 can smoothly enter the mounting through hole 21.

[0057] After the particle needle 3 is partially inserted into the mounting through hole 21, the operator releases the rear end of the pressing member 41. The elastic rubber part 43 returns to its original deformation state under its own elasticity, causing the pressing member 41 to swing back from the deflected position. The first limiting member 42 at its front end then returns to a position close to the front end of the mounting through hole 21. At this time, the first limiting member 42 abuts against the outer wall of the particle needle 3 in the first direction. Since the second limiting mechanism 5 and the first limiting mechanism 4 achieve synchronous response through structural linkage, as the first limiting member 42 returns to the abutting state, the second limiting mechanism 5 also moves along the second direction to abut against the particle needle 3. The first direction and the second direction are not parallel to each other, thus restricting the particle needle 3 in two different directions. The cooperation of this structure allows the particle needle 3 to be constrained in two different directions within the mounting through hole 21, thereby maintaining high assembly stability in the through hole even when the particle needle 3 has no Luer interface.

[0058] It is worth noting that the elastic rubber part 43, through its flexible deformation characteristics, allows the pressing member 41 to achieve controllable deflection movement and return to its initial position after the external force is released. This not only provides the first limiting mechanism 4 with operational flexibility but also restores its limiting function after the particle needle 3 is inserted. The first limiting member 42 and the second limiting mechanism 5 provide abutment action in different directions, providing stable support for the particle needle 3 in multiple directions and preventing slight wobbling or displacement of the particle needle 3 during the pushing process, thereby improving the accuracy and safety of the particle needle 3 pushing. The swing connection method of the pressing member 41 allows the operator to complete the switching action of the limiting member with a single finger press, without the need for additional tools, making the operation process simple.

[0059] In terms of structural definition, the first direction refers to the direction in which the first limiting member 42 applies a resisting force to the particle needle 3, which generally has a certain angle with the insertion direction of the particle needle 3, and is used to limit the radial movement of the particle needle 3; the second direction refers to the direction in which the second limiting mechanism 5 applies a resisting force to the particle needle 3, which is usually not parallel to the first direction, and is used to provide lateral stable support for the particle needle 3. Through the resisting action of these two directions, the particle needle 3 is subjected to a combined supporting force within the mounting through hole 21, thereby maintaining a stable state under vibration, rotation, or slight tension.

[0060] Overall, the structural design of this embodiment, without altering the traditional Luer-less interface particle needle 3 structure, utilizes a first limiting mechanism 4 with swing and reset functions and a linked second limiting mechanism 5 to ensure smooth insertion of the particle needle 3 during insertion and stable support in multiple directions after insertion. This design improves the connection stability and operational reliability of the particle pusher, reduces the risk of displacement of the particle needle 3 during installation, and thus enhances the accuracy and safety of particle implantation in actual surgery.

[0061] In some implementations, combined with Figure 2 , Figure 3 The second limiting mechanism 5 includes an abutment 51, a transmission assembly 52, and a second limiting member 53; wherein, an insertion channel 22 is provided on the biopsy needle connector 2 and below the rear end of the pressing member 41, the length direction of the insertion channel 22 is perpendicular to the mounting through hole 21, and a portion of the abutment 51 is movably inserted into the insertion channel 22.

[0062] Furthermore, the biopsy needle connector 2 has a transmission cavity 23 that communicates with the insertion channel 22, and the transmission assembly 52 is movably disposed in the transmission cavity 23, and the first end of the transmission assembly 52 is in transmission engagement with the abutment member 51.

[0063] Furthermore, a movable tube 6 is provided in the transmission cavity 23 near the front opening of the mounting through hole 21. The movable tube 6 has a movable channel 61 that is perpendicular to the mounting through hole 21, and the length direction of the movable channel 61 is perpendicular to the length direction of the insertion channel 22. The second limiting member 53 is slidably provided in the movable channel 61. A strip hole 62 is provided on the side wall of the movable tube 6 along the length direction of the movable channel 61. The second end of the transmission assembly 52 passes through the strip hole 62 and is connected to the second limiting member 53.

[0064] For example, the position of the movable tube 6 is close to the position where the first limiting member 42 abuts against the particle needle 3. It can be understood that the arrangement of the movable tube 6 inside the biopsy needle connector 2 is close to the position where the first limiting member 42 abuts against the particle needle 3 in the first direction, and the distance between the movable tube 6 and the mounting through hole 21 is a clearly defined spatial relationship in the structural design, so that the position where the second limiting member 53 abuts against the particle needle 3 in the second direction is adjacent to the position where the first limiting member 42 abuts against the particle needle 3 in the first direction. The first and second directions are not parallel; therefore, if the force application points of the two limiting directions deviate too much from each other, the particle needle 3 will bear a dispersed lateral force on its overhanging section inserted into the mounting through hole 21.

[0065] By arranging the movable tube 6 near the position where the first limiting member 42 abuts against the particle needle 3, the abutting position of the second limiting member 53 in the second direction and the abutting position of the first limiting member 42 in the first direction form an adjacent action zone. The forces in the two limiting directions are concentrated on the relatively close parts of the particle needle. This structural layout reduces the bending moment length of the force-bearing section of the particle needle 3 to a certain extent, which helps to reduce the risk of bending, displacement, or slight deflection of the particle needle 3 due to uneven force during insertion, and makes the particle needle 3 in a more stable limiting state within the mounting through hole 21. At the same time, this adjacent arrangement also helps the second limiting member 53 to respond more quickly to the reset change of the first limiting member 42 through the displacement action of the transmission component 52, keeping the action of the two limiting directions coordinated and improving the synchronicity of the limiting linkage. In this embodiment, through the synergistic relationship of the structural positions, the particle needle 3 is in a more stable spatial constraint zone under bidirectional limiting, further enhancing the positioning reliability of the particle needle 3 under multi-directional forces.

[0066] Furthermore, when the rear end of the pressing member 41 is offset toward the outer wall of the biopsy needle connector 2, the rear end of the pressing member 41 pushes the abutment member 51 to move into the insertion channel 22, thereby driving the transmission assembly 52 to move the second limiting member 53 away from the mounting through hole 21 in the moving channel 61; at the same time, when the rear end of the pressing member 41 is offset toward the outer wall of the biopsy needle connector 2, the abutment member 51 automatically moves to the outside of the insertion channel 22, and the second limiting member 53 automatically moves in the moving channel 61 toward the mounting through hole 21, so as to abut against the particle needle 3 inserted in the mounting through hole 21 in the second direction.

[0067] It is understandable that during operation, when the operator presses the rear end of the pressing member 41 with their thumb, the rear end of the pressing member 41 shifts towards the outer wall of the biopsy needle connector 2 due to the force, pushing the abutment member 51 to move into the insertion channel 22. The movement of the abutment member 51 transmits the displacement to the transmission component 52 through its transmission engagement with the transmission component 52, causing the transmission component 52 to move accordingly in the transmission cavity 23, thereby driving the second limiting member 53 to slide away from the mounting through hole 21 in the moving channel 61 of the moving tube 6. At this time, the second limiting member 53 is in an offset state away from the mounting through hole 21, no longer overlapping with the internal space of the mounting through hole 21, and will not contact the outer wall of the particle needle 3, thus ensuring that the particle needle 3 can be smoothly inserted into the mounting through hole 21 without being obstructed by the structure of the second limiting mechanism 5. At the same time, the front end of the pressing part 41 of the first limiting mechanism 4 tilts upward under the pressing action, causing the first limiting part 42 and the mounting through hole 21 to form a misaligned distribution, so that the entrance of the mounting through hole 21 remains fully open during the insertion stage of the particle needle 3, and the particle needle 3 can obtain stable guidance during the insertion process.

[0068] When the operator releases the rear end of the pressing member 41, the elastic rubber part 43 rebounds under its own elastic recovery, causing the pressing member 41 to return from the deflected position to its initial state. The first limiting member 42 at the front end of the pressing member 41 returns to a position close to the front opening of the mounting through hole 21, and applies a certain resistance force to the particle needle 3 inserted into the mounting through hole 21 in the first direction. At the same time, since the rear end of the pressing member 41 no longer applies force to the abutting member 51, the abutting member 51 automatically moves towards the outside of the insertion channel 22. The transmission component 52 retracts synchronously in the transmission cavity 23, and its second end drives the second limiting member 53 to move along the moving channel 61 to a position close to the mounting through hole 21, so that the second limiting member 53 abuts against the outer wall of the particle needle 3 inserted into the mounting through hole 21 in the second direction. The first direction and the second direction are not parallel to each other. The angular relationship between them makes the particle needle 3 receive support from different directions in the mounting through hole 21, which can effectively limit the swaying and axial displacement of the particle needle 3 in multiple directions. Thus, even without the Luer interface structure of the particle needle 3, it can maintain high assembly stability in the mounting through hole 21.

[0069] In terms of structural definition, the insertion channel 22 is used to limit the movement direction of the abutment member 51, ensuring that the abutment member 51 moves along a stable path when subjected to pressure; the transmission cavity 23 provides movable space for the transmission assembly 52 and reduces motion friction through its internal sliding guide structure; the moving tube 6 serves as a guide element for the second limiting member 53, and its internal moving channel 61 is perpendicular to the mounting through hole 21, forming a multi-directional constraint system. The slot 62 is provided to ensure the linkage between the transmission assembly 52 and the second limiting member 53, while also giving it a certain degree of freedom of movement, making the transmission action smoother.

[0070] Through the synergistic effect of the above structures, both the first limiting mechanism 4 and the second limiting mechanism 5 are in a yielding state when pressed, ensuring smooth insertion of the particle needle 3. In the released and reset state, the two limiting mechanisms provide resistance and support to the particle needle 3 in different directions. This design achieves dynamic limiting control through multi-directional transmission coordination while maintaining structural simplicity. This is beneficial for maintaining the assembly stability and positioning accuracy of the particle needle 3 during surgical operations, while also improving the overall operational reliability and safety of the pusher.

[0071] In some implementations, combined with Figure 3 , Figure 4 and Figure 5The abutment member 51 includes an abutment post 511 and an abutment block 512. The abutment post 511 is movably inserted into the insertion channel 22, and the abutment block 512 is located at the end of the abutment post 511 outside the insertion channel 22, and the abutment block 512 is used to slide against the rear end of the pressing member 41. The length direction of the abutment post 511 is consistent with the axial direction of the insertion channel 22 to ensure that the abutment post 511 moves along a stable straight trajectory during reciprocating motion, avoiding lateral swaying from affecting the transmission action.

[0072] For example, the surface of the abutment block 512 facing away from the abutment post 511 is arc-shaped and smooth, so that it can bear the operating force more evenly during the pressing action, reduce local contact stress, and improve the stability of the pressing action.

[0073] For example, a side groove 24 is formed in the same direction on the side wall of the insertion channel 22, and a limiting block 7 is provided on the abutment post 511. The limiting block 7 extends into the side groove 24 and slides with the side groove 24. The presence of the limiting block 7 in the side groove 24 limits the maximum displacement range of the abutment post 511, preventing it from moving excessively and detaching from the guide structure when compressed or rebounding. On the other hand, it also forms a sliding guide fit, so that the abutment post 511 maintains a stable linear movement state along the length direction of the insertion channel 22. A first spring 71 is connected between the limiting block 7 and the end wall of the side groove 24. The first spring 71 always has the tendency to push the abutment post 511 outward along the length direction of the insertion channel 22.

[0074] It is understandable that during operation, when the rear end area of ​​the pressing component 41 is pressed downwards, the pressing force is transmitted to the abutment post 511 through the abutment block 512, causing the abutment post 511 to move inwards along the length of the insertion channel 22. As the abutment post 511 moves, the limiting block 7 slides inwards in the side groove 24, and the first spring 71 is compressed and stores a certain amount of elastic potential energy. When the operator releases the pressing component 41, the pressing force disappears, and the first spring 71 releases energy outwards under its own rebound force, pushing the limiting block 7 to move in the opposite direction along the side groove 24, and further driving the abutment post 511 to move outwards along the direction of the insertion channel 22, thereby causing the abutment block 512 to return to its initial ready-to-press state. Due to the elastic effect of the first spring 71, the abutment post 511 can automatically reset after each pressing cycle, providing an initial position for the next pressing action. This structural design is beneficial for the operator to maintain a stable force feedback feeling and operating rhythm during continuous particle implantation operations.

[0075] Based on this, through the mutual cooperation of the abutment block 512, the abutment post 511, the limiting block 7 and the first spring 71, the second limiting mechanism 5 forms a mechanical unit with self-resetting function in the transmission system. Structurally, it ensures the reliability of force transmission and the flexibility of reset. It can maintain the precise positional relationship between each component while ensuring smooth movement, which is beneficial to the stability and service life of the particle pusher in actual use.

[0076] In some implementations, combined with Figures 2 to 5 The second limiting member 53 includes a moving block 531 and a limiting rubber block 532. The moving block 531 is slidably disposed in the moving channel 61, and the limiting rubber block 532 is disposed on the side of the moving block 531 facing the mounting through hole 21. The second end of the transmission component 52 is connected to the moving block 531, so that the moving block 531 can move along the length direction of the moving channel 61 under the pushing action of the transmission component 52.

[0077] For example, combined Figure 4 , Figure 5 A second spring 8 is provided inside the movable tube 6. The first end of the second spring 8 is connected to the inner end wall of the movable tube 6 away from the mounting through hole 21, and the second end of the second spring 8 is connected to the wall surface of the movable block 531 away from the mounting through hole 21. The second spring 8 always has the tendency to push the movable block 531 along the length direction of the movable channel 61 toward the side closer to the mounting through hole 21. When the second end of the transmission component 52 is connected to the movable block 531 and pushed outward, the movable block 531 moves away from the mounting through hole 21 within the movable channel 61, causing the second spring 8 inside the movable tube 6 to be in a compressed state, thereby accumulating elastic potential energy in the process. When the transmission component 52 removes the pushing force, the second spring 8, under the action of its own rebound force, pushes the movable block 531 along the length direction of the movable channel 61 toward the direction closer to the mounting through hole 21, so that the limiting rubber block 532 is once again close to the outer wall of the particle needle 3.

[0078] For example, the wall surface of the limiting rubber block 532 facing away from the moving block 531 is an arc-shaped surface 5321, and the curvature of the arc-shaped surface 5321 is consistent with the curvature of the outer wall of the particle needle 3 and the curvature of the inner wall of the mounting through hole 21. When the particle needle 3 is inserted into the mounting through hole 21, the arc-shaped surface 5321 of the limiting rubber block 532 fits and limits the particle needle 3 under the pushing force of the second spring 8, which can reduce the swaying of the particle needle 3 in the radial direction and limit the rotation of the particle needle 3 in the circumferential direction, so that the particle needle 3 maintains a stable positioning state in the through hole. This structural fit can reduce the problem of particle needle 3 loosening due to vibration or external impact to a certain extent, improve the matching accuracy and assembly stability between the particle needle 3 and the mounting hole, and thus help the particle pusher maintain reliable motion consistency during repeated pushing and retraction. The interaction of the overall structure forms a functional fit of mechanical reset, limiting and anti-rotation, making the particle pushing process smoother and more stable, and can improve the service life and working reliability of the device to a certain extent.

[0079] In some implementations, combined with Figure 3 , Figure 4 and Figure 5 The transmission assembly 52 includes a first transmission rod 521, a second transmission rod 522, and a telescopic guide 523. The biopsy needle connector 2 has a transmission channel 25. One end of the transmission channel 25 is perpendicularly connected to the insertion hole 22, and the other end is connected to the transmission cavity 23. The first transmission rod 521 is slidably inserted into the transmission channel 25. The rod end of the first transmission rod 521 near the insertion hole 22 has a first sliding inclined surface 5211, and the end of the abutment post 511 away from the abutment block 512 has a second sliding inclined surface 5111. The first sliding inclined surface 5211 and the second sliding inclined surface 5111 slide against each other and form an oblique force transmission interface by sliding against each other.

[0080] Furthermore, the second transmission rod 522 is vertically connected to the end of the first transmission rod 521 away from the insertion hole 22, and the end of the second transmission rod 522 away from the first transmission rod 521 passes through the strip hole 62 and is connected to the movable plate.

[0081] It is understandable that when the abutment post 511 moves downward within the insertion channel 22 under external force, the second sliding inclined surface 5111 slides along the first sliding inclined surface 5211, thereby causing the first transmission rod 521 to be subjected to a thrust component along its length in the transmission channel 25. This thrust component causes the first transmission rod 521 to move along the side away from the insertion channel 22. To ensure that this transmission motion can continue to be transmitted to the subsequent components, the second transmission rod 522 is vertically connected to the end of the first transmission rod 521 away from the insertion channel 22, and the other end of the second transmission rod 522 passes through the mounting wall with the slot 62 and is connected to the second limiting member 53. With this structural arrangement, the axial movement of the first transmission rod 521 can be converted into a linear push on the moving block 531 through the vertical force transmission direction of the second transmission rod 522, so that the moving block 531 located in the moving channel 61 can move along its length towards the side away from the mounting through hole 21.

[0082] When the abutment post 511 moves upward under the elastic action of the first spring 71, the contact force between the second sliding inclined surface 5111 and the first sliding inclined surface 5211 weakens, and the first transmission rod 521 loses its external pushing force within the transmission channel 25. At this time, the second spring 8 located in the moving channel 61 pushes the moving block 531 to move towards the side closer to the mounting through hole 21 under the action of the rebound force, thereby driving the second transmission rod 522 to move in the opposite direction. During this process, the first transmission rod 521 also resets along the direction of the transmission channel 25 and re-maintains a relatively sliding contact with the abutment post 511. Through this bidirectional force transmission structure, the particle pusher can achieve coordination of pushing and resetting actions in the working cycle, enabling the reciprocating pushing process of the particle needle 3 to have a mechanical adaptive return function, and the movement path is more controllable.

[0083] For example, refer to Figure 4 , Figure 5 The transmission cavity 23 is provided with a mounting plate 9, and the telescopic guide 523 is telescopically disposed between the mounting plate 9 and the second transmission rod 522, and the telescopic direction of the telescopic guide 523 is parallel to the moving direction of the second limiting member 53.

[0084] Furthermore, combined Figure 5 , Figure 6 Multiple telescopic guide members 523 are provided at intervals between the mounting plate 9 and the second transmission rod 522. The telescopic guide member 523 includes a sliding rod 5231 and a sliding cylinder 5232. The sliding cylinder 5232 is mounted on the mounting plate 9, the sliding rod 5231 is connected to the second transmission rod 522, and the sliding rod 5231 is axially inserted into the sliding cylinder 5232.

[0085] It is understandable that the distribution of multiple telescopic guide members 523 allows the second transmission rod 522 to maintain a parallel and stable direction of movement under the constraint of multi-point support when subjected to the pushing force transmitted by the first transmission rod 521. This helps reduce the swaying phenomenon of the second transmission rod 522 caused by off-center loading or slight tilting, thus making the force transmission more linear and controllable. The sliding fit between the sliding cylinder 5232 and the sliding rod 5231 also has guiding and buffering functions. When the second transmission rod 522 reciprocates, it can reduce the impact caused by friction fluctuations to a certain extent, improving the smoothness of the mechanism during continuous operation.

[0086] For example, an anti-detachment protrusion is provided at one end of the sliding rod 5231 located inside the sliding cylinder 5232, and an anti-detachment flange is provided on the outer peripheral wall of the opening of the sliding cylinder 5232 to prevent the anti-detachment flange from detaching, so that the sliding rod 5231 and the sliding cylinder 5232 can slide stably and are not easy to detach.

[0087] In some implementations, combined with Figure 1 , Figure 2 The first limiting member 42 has a limiting groove 421 at the end away from the pressing member 41. The limiting groove 421 is used to abut against the particle needle 3 in the first direction. Furthermore, the geometry of the limiting groove 421 matches the shape of the front end of the particle needle 3, so as to form an abutment relationship during the movement of the particle needle 3 along the first direction (i.e., the direction of advancement of the particle needle 3).

[0088] Furthermore, when the first spring 71 is in its natural state, the abutment block 512 and the rear end wall of the pressing member 41 remain in contact, and the limiting groove 421 and the mounting through hole 21 are coaxially aligned. The upper surface of the abutment block 512 is in contact with the rear end wall of the pressing member 41, forming an initial alignment state. At this time, the limiting groove 421 and the mounting through hole 21 are coaxially aligned, so that when the particle needle 3 is not yet inserted, the limiting groove 421 and the mounting through hole 21 can be kept consistent along the central axis direction, which is beneficial to the guiding accuracy and positioning effect in the subsequent pushing process.

[0089] In some embodiments, the biopsy needle connector 2 has an opening, and the transmission cavity 23 communicates with the outside through the opening. A cover plate is snapped onto the opening, and the second transmission mechanism can be replaced or repaired by removing the cover plate.

[0090] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0091] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0092] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0093] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A particle pusher, characterized in that, include: Main handle(1); The biopsy needle connector (2) is coaxially connected to the front end of the main handle (1), and the biopsy needle connector (2) has an axially formed mounting through hole (21), which is configured to allow the particle needle (3) to be partially inserted. The first limiting mechanism (4) includes a pressing member (41), a first limiting member (42), and an elastic rubber part (43). The pressing member (41) is oscillatingly connected to the outer wall of the biopsy needle connector (2) through the elastic rubber part (43), and the elastic rubber part (43) is located between the front end and the rear end of the pressing member (41). The first limiting member (42) is located at the front end of the pressing member (41) and at the front end of the mounting through hole (21). When the rear end of the pressing member (41) is pressed and shifts toward the outer wall of the biopsy needle connector (2), the first limiting member (42) moves toward the direction away from the mounting through hole (21) and is misaligned with the mounting through hole (21). When the particle needle (3) is partially inserted into the mounting through hole (21) and the rear end of the pressing member (41) is no longer pressed, the elastic rubber part (43) elastically resets so that the first limiting member (42) and the particle needle (3) abut in the first direction. The second limiting mechanism (5) is located inside the biopsy needle connector (2) and is in transmission cooperation with the first limiting mechanism (4); wherein, When the first limiting member (42) and the particle needle (3) in the insertion mounting through hole (21) abut in the first direction, the second limiting mechanism (5) automatically abuts in the particle needle (3) in the insertion mounting through hole (21) in the second direction, and the first direction and the second direction are not parallel to each other; When the first limiting member (42) is in a position that is misaligned with the mounting through hole (21), the second limiting mechanism (5) automatically becomes spaced apart from the mounting through hole (21); The second limiting mechanism (5) includes an abutment member (51), a transmission assembly (52), and a second limiting member (53); wherein, The biopsy needle connector (2) has an insertion channel (22) located below the rear end of the pressing member (41). The length direction of the insertion channel (22) is perpendicular to the mounting through hole (21). A portion of the abutment member (51) is movably inserted into the insertion channel (22). The biopsy needle connector (2) has a transmission cavity (23) communicating with the insertion channel (22), and the transmission assembly (52) is movably disposed in the transmission cavity (23), and the first end of the transmission assembly (52) is in transmission engagement with the abutment (51). The transmission cavity (23) is provided with a movable tube (6) near the front opening of the mounting through hole (21). The movable tube (6) is provided with a movable channel (61) that is perpendicular to the mounting through hole (21). The length direction of the movable channel (61) is perpendicular to the length direction of the insertion channel (22). The second limiting member (53) is slidably provided in the movable channel (61). The side wall of the movable tube (6) is provided with a strip hole (62) along the length direction of the movable channel (61). The second end of the transmission assembly (52) passes through the strip hole (62) and is connected to the second limiting member (53). When the rear end of the pressing member (41) is offset toward the outer wall of the biopsy needle connector (2), the rear end of the pressing member (41) pushes the abutment member (51) into the insertion channel (22) to drive the transmission assembly (52) to move the second limiting member (53) away from the mounting through hole (21) in the moving channel (61); As the rear end of the pressing member (41) shifts away from the outer wall of the biopsy needle connector (2), the abutment member (51) automatically moves outward from the insertion channel (22), while the second limiting member (53) automatically moves in the moving channel (61) toward the mounting through hole (21) to abut against the particle needle (3) inserted in the mounting through hole (21) in the second direction.

2. The particle pusher according to claim 1, characterized in that, The abutting member (51) includes an abutting post (511) and an abutting block (512). The abutting post (511) is movably inserted into the insertion channel (22). The abutting block (512) is located at one end of the abutting post (511) outside the insertion channel (22) and is used to slide against the rear end of the pressing member (41).

3. The particle pusher according to claim 2, characterized in that, The side wall of the insertion channel (22) is provided with a side groove (24) in the same direction. The abutment post (511) is provided with a limiting block (7). The limiting block (7) extends into the side groove (24) and slides with the side groove (24). A first spring (71) is connected between the limiting block (7) and the end wall of the side groove (24) in the side groove (24). The first spring (71) always has the tendency to push the abutment post (511) outward along the length direction of the insertion channel (22).

4. The particle pusher according to claim 2, characterized in that, The second limiting member (53) includes a moving block (531) and a limiting rubber block (532). The moving block (531) is slidably disposed in the moving channel (61), and the limiting rubber block (532) is disposed on the side of the moving block (531) facing the mounting through hole (21). The second end of the transmission component (52) is connected to the moving block (531).

5. The particle pusher according to claim 4, characterized in that, The wall surface of the limiting rubber block (532) facing away from the moving block (531) is an arc-shaped surface (5321), and the curvature of the arc-shaped surface (5321) is consistent with the curvature of the outer wall of the particle needle (3) and the curvature of the inner wall of the mounting through hole (21).

6. The particle pusher according to claim 4, characterized in that, The movable tube (6) is provided with a second spring (8). The first end of the second spring (8) is connected to the inner end wall of the movable tube (6) away from the mounting through hole (21). The second end of the second spring (8) is connected to the wall surface of the movable block (531) away from the mounting through hole (21). The second spring (8) always has the tendency to push the movable block (531) along the length direction of the movable channel (61) toward the side closer to the mounting through hole (21).

7. The particle pusher according to claim 2, characterized in that, The transmission assembly (52) includes a first transmission rod (521), a second transmission rod (522), and a telescopic guide (523), wherein, The biopsy needle connector (2) has a transmission channel (25) inside. One end of the transmission channel (25) is perpendicularly connected to the insertion hole (22), and the other end is connected to the transmission cavity (23). The first transmission rod (521) is slidably inserted into the transmission channel (25). The rod end of the first transmission rod (521) near the insertion hole (22) has a first sliding inclined surface (5211). The end of the abutment post (511) away from the abutment block (512) has a second sliding inclined surface (5111). The first sliding inclined surface (5211) and the second sliding inclined surface (5111) slide and fit against each other. The second transmission rod (522) is vertically connected to the end of the first transmission rod (521) away from the insertion hole (22), and the end of the second transmission rod (522) away from the first transmission rod (521) passes through the strip hole (62) and is connected to the second limiting member (53); The transmission cavity (23) is provided with a mounting plate (9), and the telescopic guide (523) is telescopically disposed between the mounting plate (9) and the second transmission rod (522), and the telescopic direction of the telescopic guide (523) is parallel to the moving direction of the second limiting member (53).

8. The particle pusher according to claim 7, characterized in that, Multiple telescopic guide members (523) are provided at intervals between the mounting plate (9) and the second transmission rod (522). Each telescopic guide member (523) includes a sliding rod (5231) and a sliding cylinder (5232). The sliding cylinder (5232) is mounted on the mounting plate (9). The sliding rod (5231) is connected to the second transmission rod (522) and is axially inserted into the sliding cylinder (5232).

9. The particle pusher according to any one of claims 3 to 8, characterized in that, The first limiting member (42) has a limiting groove (421) at one end away from the pressing member (41), and the limiting groove (421) is used to abut against the particle needle (3) in the first direction; When the first spring (71) is in its natural state, the abutment block (512) is in contact with the rear wall of the pressing member (41), and the limiting groove (421) is coaxially aligned with the mounting through hole (21).

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