A unilateral cortical bone pin

Abstract

The present application relates to the technical field of medical devices, and provides a unilateral cortical bone needle, including a syringe and a needle core, the syringe is hollow and forms a penetration channel, the needle core is penetrated through the penetration channel and is threadedly connected to the syringe; the syringe includes a connecting sleeve and a plug strip, one end of the plug strip is connected to the end face of the connecting sleeve, a plurality of plug strips are arranged around the central axis of the connecting sleeve, and a deformation groove is formed between two adjacent plug strips; a plug blind hole is opened on the surface of the human sternum, and the end of all the plug strips away from the connecting sleeve is normally retracted into the penetration channel for insertion into the plug blind hole. A unilateral cortical bone needle of the present application can reduce the possibility of the patient's pleura being pierced by the bone needle.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a unilateral cortical bone needle. Background Art

[0002] In fracture fixation surgery, commonly used fixation instruments include steel plates, screws, intramedullary nails, etc. These traditional fixation instruments are widely used in clinical practice and meet the needs of doctors to a certain extent, significantly improving the success rate of surgery and the recovery speed of patients. However, with the advancement of medical technology and the accumulation of clinical practice, people have put forward higher requirements for fracture fixation, especially when dealing with special parts such as sternal fractures, the existing fixation instruments seem to be unable to cope with it.

[0003] For sternal fractures, traditional fixation methods mainly include the use of steel plates and screws for fixation. Specifically, the purpose of stabilizing the fracture can be achieved by fitting the steel plate to the surface of the sternum and then fixing it to the sternum with screws. Another common method is the use of intramedullary nails, which are inserted into the sternum to support and fix the fractured part using its mechanical properties. In addition, there are some auxiliary tools and techniques, such as the use of traction devices to help with reduction and then fixation.

[0004] Although the above methods can effectively fix fractures in most cases, they have obvious defects for sternal fractures. Since sternal fractures are characterized by inward collapse, conventional bone screw penetration methods can easily lead to pleural puncture, which in turn causes serious complications and even endangers the patient's life. Therefore, it is urgent to develop a new bone pin that can ensure fracture fixation while minimizing the risk of pleural damage. Summary of the invention

[0005] In order to reduce the possibility of the patient's pleura being punctured by the bone needle, the present application provides a unilateral cortical bone needle.

[0006] The unilateral cortical bone needle provided in this application adopts the following technical solution:

[0007] A unilateral cortical bone needle comprises a syringe and a needle core, wherein the syringe is hollow and forms a penetration channel, and the needle core is penetrated through the penetration channel and is threadedly connected to the syringe; the syringe comprises a connecting sleeve and a plug-in strip, one end of the plug-in strip is connected to the end surface of the connecting sleeve, and a plurality of the plug-in strips are arranged around the central axis of the connecting sleeve, and a deformation groove is formed between two adjacent plug-in strips; a plug-in blind hole is opened on the surface of the human sternum, and the ends of all the plug-in strips away from the connecting sleeve are normally retracted into the penetration channel for insertion into the plug-in blind hole.

[0008] By adopting the above technical solution, a plug-in blind hole is opened on the surface of the human sternum through the setting of the plug-in strip, and then a plurality of plug-in strips of the syringe are inserted into the plug-in blind hole, and then the needle core is rotated to force one end of the needle core to move toward the plug-in blind hole. When one end of the needle core moves between the plurality of plug-in strips, the needle core can push the inner surfaces of all the plug-in strips, forcing all the plug-in strips to open outward at one end away from the connecting sleeve to press against the inner wall of the plug-in blind hole, thereby achieving the connection and fixation between the syringe and the human sternum. This design not only reduces the risk of the bone needle penetrating the sternum and causing the pleura to be punctured, thereby improving the safety of the operation, but also ensures that after the sternum recovers, the needle core can be rotated in the opposite direction to restore the deformation of the plug-in strip and facilitate the removal of the syringe, thereby improving the convenience of disassembly and assembly of the overall structure and the flexibility of use.

[0009] Optionally, an outer surface of one end of each plug-in strip away from the connecting sleeve is protrudingly provided with an embedded arc strip, and an inner wall of the deformation groove on one side close to the connecting sleeve is provided with a deformation hole, and the outer diameter of the deformation hole is greater than the width of the deformation groove.

[0010] By adopting the above-mentioned technical solution, the design of the embedded arc strip can produce a closer contact between the embedded arc strip and the inner wall of the blind hole when the syringe is inserted into the blind hole of the sternum, thereby increasing the friction and further improving the stability of the fixation; at the same time, the presence of the deformation hole allows the plug-in strip to have sufficient space to deform when it is opened under force, thereby ensuring the reliability of the entire device.

[0011] Optionally, the syringe is provided with a folding auxiliary component, and when the needle core is displaced toward the side away from the plug-in blind hole, the folding auxiliary component forces the end of the plug-in strip away from the connecting sleeve to fold inward to disengage from the inner wall of the plug-in blind hole.

[0012] By adopting the above-mentioned technical solution, when the syringe needs to be removed after the patient's sternum recovers, the needle core is forced to move to the side away from the plug-in blind hole. At this time, the retraction auxiliary component forces the end of the plug-in strip away from the connecting sleeve to retract inward, so that the plug-in strip can be smoothly separated from the inner wall of the plug-in blind hole, which is convenient for quick removal of the syringe and improves the convenience and safety of surgical operations.

[0013] Optionally, the folding auxiliary component includes a plurality of push-pull plates, and the plurality of push-pull plates are arranged corresponding to the plurality of plug-in strips, and each of the push-pull plates is arranged on the inner surface of the corresponding plug-in strip; the outer peripheral wall at one end of the needle core has an embedded annular groove, and when the needle core forces all the plug-in strips to open outward and continues to drive the needle core to move toward the plug-in blind hole, the push-pull plate is deformed and embedded in the embedded annular groove; when the needle core moves away from the plug-in blind hole, the needle core pushes the push-pull plate through the inner wall of the embedded annular groove to force the end of the plug-in strip away from the connecting sleeve to fold inward.

[0014] By adopting the above-mentioned technical solution, the syringe is inserted into the plug-in blind hole and the needle core is rotated to move the needle core between multiple plug-in strips, forcing all the plug-in strips to open outward. The design of the push-pull plate makes it possible for the needle core to be embedded in the embedded annular groove on the needle core due to deformation when the needle core continues to move toward the plug-in blind hole, thereby further enhancing the fixing effect. Conversely, when the bone needle needs to be removed, it is only necessary to rotate the needle core in the opposite direction, and the needle core pushes the push-pull plate through the inner wall of the embedded annular groove, thereby generating an inward pulling force on the plug-in strip through the push-pull plate, so that the outer surface of the plug-in strip can be smoothly separated from the inner wall of the plug-in blind hole, so as to facilitate the smooth removal of the syringe.

[0015] Optionally, the folding auxiliary component includes a fixed ring, a push piece, a positioning piece and a push piece, the fixed ring is sleeved on the outer peripheral wall of the syringe and is detachably connected to the syringe through the positioning piece; one end of the push piece is connected to the inner wall of the fixed ring, the number of the push pieces is arranged corresponding to the number of the plug-in strips, and each of the push pieces abuts against the outer surface of the corresponding plug-in strip; the push piece is arranged between the fixed ring and the needle core, and when the needle core moves toward the side away from the plug-in blind hole, the push piece forces the free end of the push piece to fold toward the through-channel.

[0016] By adopting the above technical solution, when the needle core moves toward the side away from the plug-in blind hole, the push piece can force the free end of the push piece to retract into the penetration channel, thereby prompting the end of the plug-in strip away from the connecting sleeve to retract inward, so that the plug-in strip is separated from the inner wall of the plug-in blind hole, which is convenient for quick disassembly of the needle barrel, improving the convenience of disassembly and assembly of the bone needle and the efficiency of surgery. At the same time, the detachable connection design of the fixed ring and the needle barrel makes the entire device easier to maintain and replace parts, further improving the convenience of use.

[0017] Optionally, a deformation hole is provided on the inner wall of the deformation groove on one side close to the connecting sleeve, and a first sliding groove is provided on the inner peripheral wall of the fixed ring. The positioning member includes a positioning column and a positioning spring. The positioning column is slidably installed in the first sliding groove, and the positioning spring is installed in the first sliding groove. The positioning spring forces one end of the positioning column to be partially exposed in the first sliding groove and inserted into the deformation hole; a first guide surface is provided on the end face of the positioning column, and when the fixed ring is sleeved on the connecting sleeve by one end of the connecting sleeve away from the plug-in strip, the connecting sleeve forces the positioning column to move into the first sliding groove through the first guide surface.

[0018] By adopting the above-mentioned technical solution, when installing the fixed ring, the fixed ring is inserted into the end of the connecting sleeve away from the plug-in strip. During this process, the end face of the connecting sleeve pushes the positioning column through the first guide surface, forcing the positioning column to move into the first slide groove so that the fixed ring can be sleeved on the outer peripheral wall of the connecting sleeve; as the positioning continues to move toward the plug-in strip, when the first slide groove moves to be opposite to the deformation hole, the positioning column is inserted into the deformation hole under the action of the positioning spring to limit the axial displacement of the fixed ring along the connecting sleeve, thereby installing the fixed ring on the outside of the syringe and realizing the rapid installation of the fixed ring.

[0019] Optionally, an avoidance ring groove is provided on the outer peripheral wall of one end of the needle core, and a pushing groove is provided on the inner peripheral wall of the fixed ring, and the pushing member includes a movable ring, a docking block and a docking spring, the movable ring is slidably installed in the pushing groove, and the inner peripheral wall of the movable ring has a pushing surface, and when the movable ring is displaced toward the side away from the plug-in blind hole, the movable ring forces the free end of the pushing piece to retract into the through-channel through the pushing surface; a second groove is provided on the inner peripheral wall of the movable ring, the docking block is slidably installed in the second groove, and the docking spring is installed in the second groove, and the docking spring forces the docking block to be partially exposed in the second groove and plugged into the avoidance ring groove, and when the needle core is displaced toward the side away from the plug-in blind hole, the needle core forces the movable ring to displace toward the side away from the plug-in blind hole through the docking block.

[0020] By adopting the above technical solution, through the arrangement of the movable ring, the docking block and the docking spring, when the syringe needs to be removed after the operation, the needle core is rotated to force the needle core to move to the side away from the plug-in blind hole, and the needle core pushes the docking block by avoiding the inner wall of the ring groove, thereby driving the movable ring to move synchronously to the side away from the plug-in blind hole. During the displacement of the movable ring, the pushing surface of the movable ring can force the free end of the pushing piece to retract into the penetration channel, so as to force the end of the plug-in strip away from the connecting sleeve to retract inward and disengage from the inner wall of the plug-in blind hole, so as to separate the syringe from the sternum, thereby improving the convenience of disassembly and assembly of the syringe.

[0021] Optionally, the side wall of the docking block has a second guide surface, and when the fixed ring is sleeved on the connecting sleeve by the end of the connecting sleeve away from the plug-in strip, the connecting sleeve forces the docking block to move into the second slide groove through the second guide surface; a plug-in block is installed in the avoidance ring groove, and a docking groove is provided on the side wall of the docking block close to the avoidance ring groove. When the docking block is embedded in the avoidance ring groove, the plug-in block is embedded in the docking groove, and the needle core pushes the docking block to move toward the side away from the plug-in blind hole through the plug-in block.

[0022] By adopting the above technical solution, the second guide surface is set, so that when the fixed ring is installed, the docking block can be moved into the second slide groove, so that the fixed ring can be sleeved on the outer peripheral wall of the connecting sleeve; after the docking block is embedded in the avoidance ring groove under the action of the docking spring, the plug-in block is embedded in the docking groove of the docking block to achieve the docking between the docking block and the plug-in block, that is, to achieve the docking between the moving ring and the needle core; thereby, when the needle core moves toward the side away from the plug-in blind hole, the needle core can drive the moving ring to move synchronously to achieve the inward push of the plug-in strip.

[0023] Optionally, the inner wall of the docking groove has a third guide surface, and when the docking block is displaced relative to the needle core toward the side away from the plug-in blind hole, the docking block detaches from the plug-in block through the third guide surface; the side wall of the docking block away from the plug-in blind hole has a fourth guide surface, and when the docking block detaches from the plug-in block and continues to drive the docking block to displace toward the side away from the plug-in blind hole, the docking block moves into the second slide groove through the fourth guide surface.

[0024] By adopting the above technical solution, the needle core forces the movable ring to move toward the side away from the plug-in blind hole, so that the outer surface of the plug-in strip is separated from the inner wall of the plug-in blind hole, thereby realizing the separation between the syringe and the sternum; then, the connection between the fixed ring and the syringe is disassembled, and the fixed ring is pulled to force the fixed ring to move toward the side away from the plug-in blind hole relative to the needle core (the needle core is relatively stationary during this process), thereby driving the movable ring to move toward the side away from the plug-in blind hole relative to the needle core, and the docking block can be separated from the plug-in block through the third guide surface, thereby realizing the separation between the movable ring and the needle core; the fixed ring is continued to be pulled, and the docking block is moved into the second slide groove through the fourth guide surface, so that the fixed ring can be detached from the syringe, thereby improving the convenience of disassembly and assembly of the overall structure.

[0025] Optionally, the movable ring is provided with an unlocking member, and when the movable ring forces the free end of the push plate to retract into the penetration channel and continues to drive the movable ring to move toward a side away from the plug-in blind hole, the unlocking member forces the positioning column to disengage from the deformation hole.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. Through the setting of the plug-in strip, a plug-in blind hole is opened on the surface of the human sternum, and then multiple plug-in strips of the syringe are inserted into the plug-in blind hole, and then the needle core is rotated to force one end of the needle core to move toward the plug-in blind hole. When one end of the needle core moves between multiple plug-in strips, the needle core can push the inner surface of all the plug-in strips, forcing all the plug-in strips away from the end of the connecting sleeve to open outward to press against the inner wall of the plug-in blind hole, so as to achieve the connection and fixation between the syringe and the human sternum; this design not only reduces the risk of the bone needle penetrating the sternum and causing the pleura to be punctured, and improves the safety of the operation, but also ensures that after the sternum recovers, the needle core can be rotated in the opposite direction to restore the deformation of the plug-in strip and facilitate the removal of the syringe, thereby improving the convenience of disassembly and assembly and the flexibility of use of the overall structure;

[0028] 2. Through the setting of the push-pull piece, the syringe is inserted into the plug-in blind hole and the needle core is rotated to move the needle core between multiple plug-in strips, forcing all the plug-in strips to open outward. The design of the push-pull piece makes it possible for the needle core to be embedded in the embedded annular groove on the needle core due to deformation when the needle core continues to move toward the plug-in blind hole, further enhancing the fixing effect; conversely, when the bone needle needs to be removed, it is only necessary to rotate the needle core in the opposite direction, and the needle core pushes the push-pull piece through the inner wall of the embedded annular groove, thereby generating an inward pulling force on the plug-in strip through the push-pull piece, so that the outer surface of the plug-in strip can be smoothly separated from the inner wall of the plug-in blind hole, so as to facilitate the smooth removal of the syringe;

[0029] 3. Through the setting of the moving ring, the docking block and the docking spring, when the syringe needs to be removed after the operation, the needle core is rotated to force the needle core to move toward the side away from the plug-in blind hole. The needle core pushes the docking block through the inner wall of the avoidance ring groove, thereby driving the moving ring to move synchronously toward the side away from the plug-in blind hole. During the displacement of the moving ring, the pushing surface of the moving ring can force the free end of the pushing piece to retract toward the penetration channel, so as to force the end of the plug-in strip away from the connecting sleeve to retract inward and detach from the inner wall of the plug-in blind hole, so that the syringe is separated from the sternum, thereby improving the convenience of disassembly and assembly of the syringe. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic diagram of the structure of the steel plate and the sternum in Example 1;

[0031] Figure 2 is a schematic diagram of the overall structure of Example 1;

[0032] Figure 3 is a partial cross-sectional view of the embodiment 1 showing the insertion of the plug-in strip into the plug-in blind hole;

[0033] Figure 4 is a partial cross-sectional view of the push-pull sheet of embodiment 2;

[0034] Figure 5 is a partial cross-sectional view of the positioning member and the pushing member of the third embodiment;

[0035] Figure 6 is a partial cross-sectional view of the push plate embodied in Embodiment 3;

[0036] Figure 7 yes Figure 5 The enlarged view of point A in the middle;

[0037] Figure 8 yes Figure 6 The enlarged view of point B in the middle;

[0038] Fig. 9 yes Figure 5 Enlarged view of point C in the middle.

[0039] Explanation of reference numerals: 1, syringe; 11, through-hole; 12, connecting sleeve; 13, plug-in strip; 131, embedded arc strip; 14, deformation groove; 141, deformation hole; 2, needle core; 21, embedded ring groove; 22, avoidance ring groove; 23, plug-in block; 24, rotating groove; 25, needle head; 3, folding auxiliary component; 31, push-pull sheet; 32, fixed ring; 321, first slide groove; 322, push slide groove; 323, connecting groove; 33, push sheet ; 34. Positioning column; 341. First guide surface; 342. Unlocking groove; 35. Positioning spring; 36. Moving ring; 361. Pushing surface; 362. Second slide groove; 37. Docking block; 371. Second guide surface; 372. Docking groove; 373. Third guide surface; 374. Fourth guide surface; 38. Docking spring; 4. Unlocking rod; 41. Connecting section; 42. Pushing section; 5. Steel plate; 6. Nut; 7. Sternum; 71. Plug-in blind hole. DETAILED DESCRIPTION

[0040] The following is combined with Figure 1 -Attached Fig. 9 This application is described in further detail.

[0041] Embodiment 1:

[0042] The embodiment of the present application discloses a unilateral cortical bone pin.

[0043] Reference Figure 1 , Figure 2 A unilateral cortical bone needle comprises a syringe 1 and a needle core 2. The syringe 1 is hollow and both ends of the syringe 1 are open to form a penetration channel 11. The needle core 2 is penetrated through the penetration channel 11 and is threadedly connected to the syringe 1. In this embodiment, the syringe 1 comprises a connecting sleeve 12 and a plug-in strip 13. One end of the plug-in strip 13 is fixedly connected to an end surface of one end of the connecting sleeve 12. There are multiple plug-in strips 13. The multiple plug-in strips 13 are spaced around the central axis of the connecting sleeve 12. A long strip-shaped deformation groove 14 is formed between two adjacent plug-in strips 13. A deformation hole 141 is opened on the inner wall of each deformation groove 14 close to the connecting sleeve 12. The deformation hole 141 is a circular hole. The outer diameter of the deformation hole 141 is greater than the width of the deformation groove 14.

[0044] Reference Figure 2 , Figure 3 A plug-in blind hole 71 is provided on the surface of the human sternum 7. Under normal circumstances (when the needle core 2 is not inserted into the penetration channel 11), the ends of all the plug-in strips 13 away from the connecting sleeve 12 are retracted into the penetration channel 11 for insertion into the plug-in blind hole 71; an outer surface of one end of each plug-in strip 13 away from the connecting sleeve 12 is protrudingly provided with an embedded arc strip 131, and the embedded arc strip 131 is arranged in an arc shape around the central axis of the connecting sleeve 12, and the embedded arc strip 131 is used to abut against the inner wall of the plug-in blind hole 71, thereby increasing the friction between the plug-in strip 13 and the sternum 7.

[0045] Reference Figure 2 , Figure 3 The outer peripheral wall of the needle core 2 is threadedly connected to the inner peripheral wall of the connecting sleeve 12, and a rotation groove 24 is provided on the end face of the needle core 2 away from the plug-in strip 13. The cross-sectional shape of the rotation groove 24 is hexagonal, which is used to connect with a hexagonal wrench, so that the needle core 2 can be rotated to force the needle core 2 to approach or move away from the plug-in strip 13; when the end of the needle core 2 away from the rotation groove 24 is displaced to between multiple plug-in strips 13, the needle core 2 pushes all the plug-in strips 13 to deform and open outward, so that the outer surfaces of all the plug-in strips 13 are pressed against the inner wall of the plug-in blind hole 71.

[0046] The end of the needle core 2 away from the rotating groove 24 is set to be conical, so that the needle core 2 can be more easily inserted into the penetration channel 11 from the end of the connecting sleeve 12 away from the plug-in strip 13; a needle head 25 is fixedly installed on the end surface of the needle core 2 away from the rotating groove 24, and the needle head 25 is used to expand the outer diameter of the end of the needle core 2 away from the rotating groove 24, thereby reducing the possibility that the end of the needle core 2 away from the rotating groove 24 will pierce the plug-in blind hole 71 when the movement of the needle core 2 toward the plug-in blind hole 71 is too large.

[0047] Reference Figure 1 In this embodiment, when the fractured sternum 7 is fixed, the bone needles of this embodiment are installed on the surfaces of the two broken sternums 7 respectively, and then the steel plate 5 is installed between the multiple bone needles and locked with the nut 6, so as to fix the two broken sternums 7 and improve the patient's recovery speed and effect.

[0048] The implementation principle of Example 1 of the present application is as follows: when the bone needle is installed between the human sternum 7, a plug-in blind hole 71 is opened on the surface of the human sternum 7, and then a plurality of plug-in strips 13 of the syringe 1 are inserted into the plug-in blind hole 71, and then the needle core 2 is rotated to force one end of the needle core 2 to move toward the plug-in blind hole 71. When one end of the needle core 2 moves between the plurality of plug-in strips 13, the needle core 2 can push the inner surfaces of all the plug-in strips 13, forcing all the plug-in strips 13 to open outward at one end away from the connecting sleeve 12, so as to press against the inner wall of the plug-in blind hole 71, thereby achieving the connection and fixation between the syringe 1 and the human sternum 7; this design not only reduces the risk of the bone needle penetrating the sternum 7 and causing the pleura to be punctured, thereby improving the safety of the operation, but also ensures that after the sternum 7 is restored, the needle core 2 can be rotated in the opposite direction to restore the deformation of the plug-in strip 13 and facilitate the removal of the syringe 1, thereby improving the convenience of disassembly and assembly and the flexibility of use of the overall structure.

[0049] Embodiment 2:

[0050] The embodiment of the present application discloses a unilateral cortical bone pin.

[0051] The difference between the unilateral cortical bone needle disclosed in the embodiment of the present application and embodiment 1 is that:

[0052] Reference Figure 4 The syringe 1 is provided with a folding auxiliary component 3. When the needle core 2 moves toward the side away from the plug-in blind hole 71, the folding auxiliary component 3 forces the end of the plug-in strip 13 away from the connecting sleeve 12 to fold inward, so that the outer surface of the plug-in strip 13 is separated from the inner wall of the plug-in blind hole 71.

[0053] In this embodiment, the folding auxiliary component 3 includes a plurality of elastically arranged push-pull sheets 31, and the plurality of push-pull sheets 31 are arranged corresponding to the plurality of plug-in strips 13, and each push-pull sheet 31 is fixedly mounted on the inner surface of the corresponding plug-in strip 13; for the convenience of description, the area between the conical surface of the needle core 2 and the needle head 25 is defined as an embedded annular groove 21 below. When the needle core 2 moves between the plurality of plug-in strips 13, forcing all the plug-in strips 13 to open outward, and continues to drive the needle core 2 to move toward the plug-in blind hole 71, the needle head 25 pushes all the push-pull sheets 31 to deform, and when the needle head 25 passes over the push-pull sheet 31, the push-pull sheet 31 is embedded in the embedded annular groove 21.

[0054] It should be noted that when the push-pull sheet 31 is embedded in the embedded annular groove 21, the end of the push-pull sheet 31 away from the plug strip 13 abuts against the inner wall of the embedded annular groove 21, and the push-pull sheet 31 is still in a deformed state. When the needle core 2 moves away from the plug blind hole 71, the needle core 2 pushes the push-pull sheet 31 through the inner wall of the embedded annular groove 21, so that the end of the plug strip 13 away from the connecting sleeve 12 has a pulling force to retract inward.

[0055] The implementation principle of Example 2 of the present application is as follows: the syringe 1 is inserted into the plug-in blind hole 71 and the needle core 2 is rotated to move the needle core 2 between multiple plug-in strips 13, forcing all the plug-in strips 13 to open outward to press against the inner wall of the plug-in blind hole 71. The design of the push-pull sheet 31 makes it possible for the needle core 2 to continue to move toward the plug-in blind hole 71, and the push-pull sheet 31 will be deformed and embedded in the embedded annular groove 21 on the needle core 2, thereby further enhancing the fixing effect; conversely, when the bone needle needs to be removed, it is only necessary to rotate the needle core 2 in the opposite direction, and the needle core 2 will push the push-pull sheet 31 through the inner wall of the embedded annular groove 21, thereby generating an inward pulling force on the plug-in strip 13 through the push-pull sheet 31, so that the outer surface of the plug-in strip 13 can be smoothly separated from the inner wall of the plug-in blind hole 71, so as to facilitate the smooth disassembly of the syringe 1.

[0056] Embodiment 3:

[0057] The embodiment of the present application discloses a unilateral cortical bone pin.

[0058] The difference between the unilateral cortical bone needle disclosed in the embodiment of the present application and embodiment 2 is that:

[0059] Reference Figure 5 , Figure 6In this embodiment, when the plug strip 13 is in the open state, the outer surface of the plug strip 13 is flush with the outer peripheral wall of the connecting sleeve 12, that is, the outer diameter formed by the multiple plug strips 13 is adapted to the outer diameter of the connecting sleeve 12; the folding auxiliary component 3 includes a fixed ring 32, a push piece 33, a positioning member and a push piece. The fixed ring 32 is sleeved on the outer peripheral wall of the syringe 1, and the inner diameter of the fixed ring 32 is adapted to the outer diameter of the connecting sleeve 12. The fixed ring 32 is detachably connected to the syringe 1 through the positioning member. In this embodiment, the inner peripheral wall of the fixed ring 32 is provided with a first slide groove 321, and the number of the first slide grooves 321 is provided. The multiple first slide grooves 321 are provided corresponding to the multiple deformation holes 141, and the number of positioning members is provided corresponding to the number of the first slide grooves 321, and each positioning member is provided in the corresponding first slide groove 321.

[0060] Reference Figure 5 , Figure 7 The positioning member includes a positioning column 34 and a positioning spring 35. The positioning column 34 is slidably installed in the first slide groove 321. One end of the positioning spring 35 is fixedly connected to the inner wall of the first slide groove 321, and the other end is fixedly connected to the positioning column 34. The positioning spring 35 forces one end of the positioning column 34 to be partially exposed in the first slide groove 321 and inserted into the deformation hole 141.

[0061] The end face of the positioning column 34 is provided with a first guide surface 341. When the fixed ring 32 is sleeved on the connecting sleeve 12 from the end of the connecting sleeve 12 away from the plug-in strip 13, the connecting sleeve 12 forces the positioning column 34 to move into the first slide groove 321 through the first guide surface 341, so that the fixed ring 32 can be inserted into the outer peripheral wall of the connecting sleeve 12; it should be noted that the outer diameter of the positioning column 34 in this embodiment is smaller than the outer diameter of the deformation hole 141, so as to reduce the possibility of the positioning column 34 interfering with the deformation of the plug-in strip 13 when the plug-in strip 13 is deformed.

[0062] Reference Figure 5 , Figure 6 , Figure 8 The inner wall of the fixed ring 32 is provided with a pushing groove 322, and the pushing groove 322 is annular around the central axis of the fixed ring 32. The pushing piece 33 is elastically arranged, and one end of the pushing piece 33 is fixedly installed on the inner wall of the pushing groove 322. For the convenience of description, the other end of the pushing piece 33 is defined as the free end of the pushing piece 33 below, and the free end of the pushing piece 33 extends toward the side close to the plug-in strip 13, and the free end of the pushing piece 33 is normally turned into the pushing groove 322.

[0063] In this embodiment, there are multiple push pieces 33, and the multiple push pieces 33 are correspondingly arranged with the multiple plug-in strips 13. When the positioning column 34 is inserted into the deformation hole 141, the inner wall of each push piece 33 abuts against the outer surface of the corresponding plug-in strip 13; the push piece is arranged between the fixed ring 32 and the needle core 2. When the needle core 2 moves toward the side away from the plug-in blind hole 71, the push piece forces the free end of the push piece 33 to retract toward the through-hole 11.

[0064] Reference Figure 5 , Figure 6 , Figure 8 The pushing member includes a movable ring 36, a docking block 37 and a docking spring 38. The movable ring 36 is slidably installed in the pushing groove 322. All the pushing pieces 33 are normally rotated into the pushing groove 322 and force the movable ring 36 to move to the side of the pushing groove 322 away from the positioning column 34. In order to make the movable ring 36 normally move to the side of the pushing groove 322 away from the positioning column 34, a spring can be added between the movable ring 36 and the inner wall of the pushing groove 322 to ensure the initial position of the movable ring 36; the inner peripheral wall of the movable ring 36 is provided with a pushing surface 361. When the movable ring 36 moves toward the side away from the plug-in blind hole 71, the movable ring 36 forces the free ends of all the pushing pieces 33 to retract into the penetration channel 11 through the pushing surface 361.

[0065] An avoidance ring groove 22 is provided on the outer peripheral wall of one end of the needle core 2 close to the plug-in blind hole 71, and the avoidance ring groove 22 is annular around the central axis of the needle core 2. A second slide groove 362 is provided on the inner peripheral wall of the movable ring 36, and the number of the second slide grooves 362 is set corresponding to the number of the deformation grooves 14; the docking block 37 is slidably installed in the second slide groove 362, one end of the docking spring 38 is fixedly connected to the second slide groove 362, and the other end is fixedly connected to the docking block 37, the docking spring 38 forces the docking block 37 to be partially exposed in the second slide groove 362, and the docking spring 38 enables the docking block 37 to pass through the corresponding deformation groove 14 and insert into the avoidance ring groove 22.

[0066] Reference Figure 5 , Fig. 9 The side wall of the docking block 37 has a second guide surface 371. When the fixed ring 32 is sleeved on the connecting sleeve 12 by the end of the connecting sleeve 12 away from the plug-in strip 13, the connecting sleeve 12 forces the docking block 37 to move into the second slide groove 362 through the second guide surface 371; the plug-in block 23 is installed in the avoidance ring groove 22, and a docking groove 372 is provided on the side wall of the docking block 37 close to the avoidance ring groove 22. When the docking block 37 is embedded in the avoidance ring groove 22 and the positioning column 34 is inserted into the deformation hole 141, the plug-in block 23 is embedded in the docking groove 372, so that when the needle core 2 moves toward the side away from the plug-in blind hole 71, the needle core 2 forces the movable ring 36 to move toward the side away from the plug-in blind hole 71 through the plug-in cooperation of the docking block 37 and the plug-in block 23.

[0067] The inner wall of the docking groove 372 is provided with a third guide surface 373. When the docking block 37 is displaced relative to the needle core 2 toward the side away from the plug-in blind hole 71, the docking block 37 is separated from the plug-in block 23 through the third guide surface 373. It can be understood that when the needle core 2 is stationary, the fixed ring 32 drives the movable ring 36 to displace toward the side away from the plug-in blind hole 71, and the docking block 37 is separated from the plug-in block 23 through the third guide surface 373. The side wall of the docking block 37 away from the plug-in blind hole 71 has a fourth guide surface 374, and the fourth guide surface 374 is located on the side of the second guide surface 371 away from the plug-in blind hole 71. When the docking block 37 is separated from the plug-in block 23 and continues to drive the docking block 37 to displace toward the side away from the plug-in blind hole 71, the docking block 37 moves into the second slide groove 362 through the fourth guide surface 374, so that the movable ring 36 can be detached from the connecting sleeve 12 by the end of the connecting sleeve 12 away from the plug-in strip 13.

[0068] Reference Figure 5 , Figure 7 The movable ring 36 is provided with an unlocking piece. When the movable ring 36 forces the free end of the push piece 33 to retract into the penetration channel 11 and continues to drive the movable ring 36 to move toward the side away from the plug-in blind hole 71, the unlocking piece forces the positioning column 34 to disengage from the deformation hole 141.

[0069] The side wall of the push slide groove 322 away from the plug-in blind hole 71 is provided with a connecting groove 323 connected to the first slide groove 321, and the side wall of the positioning column 34 close to the push slide groove 322 is provided with an unlocking groove 342; in this embodiment, the unlocking member is set as an unlocking rod 4, and the unlocking rod 4 includes a connecting section 41 and a pushing section 42. The length direction of the connecting section 41 is consistent with the displacement direction of the moving ring 36, one end of the connecting section 41 is fixedly connected to the side wall of the moving ring 36 close to the positioning column 34, and one end of the pushing section 42 is fixedly connected to the side wall of the moving ring 36 close to the positioning column 34. The movable ring 36 is fixedly connected to the end surface of the connecting section 41 away from the movable ring 36, and the pushing section 42 is gradually inclined from one end close to the connecting section 41 to the end away from the connecting section 41 toward the end close to the through-channel 11. When the movable ring 36 moves toward the side close to the positioning column 34 to force the free end of the push piece 33 to retract inward, the movable ring 36 drives the unlocking rod 4 to pass through the connecting groove 323, and the pushing section 42 of the unlocking rod 4 pushes the positioning column 34 through the unlocking groove 342 to make the positioning column 34 disengage from the deformation hole 141.

[0070] The implementation principle of the embodiment 3 of the present application is as follows: when the syringe 1 needs to be detached after the human sternum 7 is restored, the fixed ring 32 is inserted into the outer peripheral wall of the connecting tube, and as the fixed ring 32 moves toward the sternum 7, when the positioning column 34 moves to be opposite to the deformation hole 141, the positioning column 34 is inserted into the deformation groove 14 under the action of the positioning spring 35. While the positioning column 34 is inserted into the deformation groove 14, the docking block 37 of the dynamic ring 36 is inserted into the avoidance ring groove 22 under the action of the docking spring 38, and the plug-in block 23 is inserted into the docking groove 372 of the docking block 37; at the same time, the connection between the fixed ring 32 and the connecting sleeve 12 and the connection between the dynamic ring 36 and the needle core 2 are realized.

[0071] Then, the needle core 2 is rotated to force the needle core 2 to move toward the side away from the plug-in blind hole 71, so as to drive the movable ring 36 to generate an extrusion force on the push plate 33 through the push surface 361. The push plate 33 acts on the corresponding plug-in strip 13, forcing the plug-in strip 13 to retract into the avoidance ring groove 22, thereby separating the plug-in strip 13 from the inner wall of the plug-in blind hole 71, thereby realizing the separation between the syringe 1 and the human sternum 7.

[0072] After the syringe 1 is removed (the needle core 2 has not yet separated from the syringe 1), the needle core 2 is continued to be rotated to force the needle core 2 to move toward one side of the connecting sleeve 12, thereby driving the movable ring 36 to continue to move toward one side of the positioning column 34, and the movable ring 36 forces the positioning column 34 to separate from the deformation hole 141 through the unlocking rod 4; then the needle core 2 is kept stationary, and the fixed ring 32 is pulled to force the fixed ring 32 to move toward one side of the connecting sleeve 12, and the docking block 37 is separated from the plug-in block 23 under the action of the third guide surface 373, and moves into the second slide groove 362 under the action of the fourth guide surface 374, so that the fixed ring 32 can slide out from the end of the connecting sleeve 12 away from the plug-in strip 13, which greatly improves the convenience of disassembly and assembly of the overall structure.

[0073] The above are preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A unilateral cortical bone needle, characterized in that: The invention comprises a needle barrel (1) and a needle core (2), wherein the needle barrel (1) is hollow and forms a penetration hole (11), and the needle core (2) is penetrated through the penetration hole (11) and is threadedly connected to the needle barrel (1); the needle barrel (1) comprises a connecting sleeve (12) and a plug-in strip (13), one end of the plug-in strip (13) is connected to the end surface of the connecting sleeve (12), a plurality of the plug-in strips (13) are arranged around the central axis of the connecting sleeve (12), and a deformation groove (14) is formed between two adjacent plug-in strips (13); a plug-in blind hole (71) is opened on the surface of the human sternum (7), and the ends of all the plug-in strips (13) away from the connecting sleeve (12) are normally The needle barrel (1) is provided with a retracting auxiliary component (3), and when the needle core (2) is displaced toward a side away from the plug-in blind hole (71), the retracting auxiliary component (3) forces the end of the plug-in strip (13) away from the connecting sleeve (12) to retract inwardly so as to be separated from the inner wall of the plug-in blind hole (71); the retracting auxiliary component (3) comprises a fixed ring (32), a push piece (33), a positioning member and a push piece, the fixed ring (32) being sleeved on the outer peripheral wall of the needle barrel (1) and being detachably connected to the needle barrel (1) through the positioning member; one end of the push piece (33) is connected to the fixed ring (32) and the push piece (33) is connected to the fixed ring (32). The inner wall of the fixed ring (32), the number of the push pieces (33) is arranged corresponding to the number of the plug strips (13), and each of the push pieces (33) is in contact with the outer surface of the corresponding plug strip (13); the push piece is arranged between the fixed ring (32) and the needle core (2), and when the needle core (2) moves toward the side away from the plug blind hole (71), the push piece forces the free end of the push piece (33) to retract into the through-hole (11); the inner wall of the deformation groove (14) close to the connecting sleeve (12) is provided with a deformation hole (141), the inner peripheral wall of the fixed ring (32) is provided with a first sliding groove (321), and the positioning member includes a positioning column (3 4) and a positioning spring (35), the positioning column (34) is slidably installed in the first slide groove (321), the positioning spring (35) is installed in the first slide groove (321), the positioning spring (35) forces one end of the positioning column (34) to be partially exposed in the first slide groove (321) and plugged into the deformation hole (141); the end surface of the positioning column (34) is provided with a first guide surface (341), when the fixed ring (32) is sleeved on the connecting sleeve (12) by one end of the connecting sleeve (12) away from the plug-in strip (13), the connecting sleeve (12) forces the positioning column (34) to move into the first slide groove (321) through the first guide surface (341);An avoidance ring groove (22) is formed on the outer peripheral wall of one end of the needle core (2), and a push groove (322) is formed on the inner peripheral wall of the fixed ring (32). The push member comprises a movable ring (36), a docking block (37) and a docking spring (38). The movable ring (36) is slidably installed in the push groove (322). The inner peripheral wall of the movable ring (36) has a push surface (361). When the movable ring (36) moves toward a side away from the plug-in blind hole (71), the movable ring (36) forces the free end of the push sheet (33) to move toward the through-hole (71) through the push surface (361). 11) is folded inward; the inner peripheral wall of the movable ring (36) is provided with a second slide groove (362), the docking block (37) is slidably installed in the second slide groove (362), the docking spring (38) is installed in the second slide groove (362), the docking spring (38) forces the docking block (37) to be partially exposed in the second slide groove (362) and plugged into the avoidance ring groove (22), when the needle core (2) moves toward the side away from the plug-in blind hole (71), the needle core (2) forces the movable ring (36) to move toward the side away from the plug-in blind hole (71) through the docking block (37). ; 2. A unilateral cortical bone needle according to claim 1, characterized in that: An embedded arc strip (131) is protruding from the outer surface of one end of each plug-in strip (13) away from the connecting sleeve (12), and a deformation hole (141) is opened on the inner wall of one side of the deformation groove (14) close to the connecting sleeve (12), and the outer diameter of the deformation hole (141) is greater than the width of the deformation groove (14).

3. A unilateral cortical bone needle according to claim 1, characterized in that: The side wall of the docking block (37) has a second guide surface (371). When the fixed ring (32) is sleeved on the connecting sleeve (12) from one end of the connecting sleeve (12) away from the plug-in strip (13), the connecting sleeve (12) forces the docking block (37) to move into the second slide groove (362) through the second guide surface (371). A plug-in block (23) is installed in the avoidance ring groove (22). A docking groove (372) is provided on the side wall of the docking block (37) close to the avoidance ring groove (22). When the docking block (37) is embedded in the avoidance ring groove (22), the plug-in block (23) is embedded in the docking groove (372), and the needle core (2) pushes the docking block (37) to move toward a side away from the plug-in blind hole (71) through the plug-in block (23).

4. A unilateral cortical bone needle according to claim 3, characterized in that: The inner wall of the docking groove (372) has a third guide surface (373). When the docking block (37) is displaced relative to the needle core (2) toward a side away from the plug-in blind hole (71), the docking block (37) is separated from the plug-in block (23) through the third guide surface (373). The side wall of the docking block (37) away from the plug-in blind hole (71) has a fourth guide surface (374). When the docking block (37) is separated from the plug-in block (23) and continues to drive the docking block (37) to displace toward a side away from the plug-in blind hole (71), the docking block (37) is moved into the second slide groove (362) through the fourth guide surface (374).

5. The unilateral cortical bone needle according to claim 1, characterized in that: The movable ring (36) is provided with an unlocking member. When the movable ring (36) forces the free end of the push plate (33) to retract into the penetration channel (11) and continues to drive the movable ring (36) to move toward a side away from the plug-in blind hole (71), the unlocking member forces the positioning column (34) to disengage from the deformation hole (141).

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