An anti-dislocation bone traction needle

Abstract

The present invention provides an anti-dislocation bone traction needle. It includes a bone needle body. The front end of the bone needle body is a tip, and the rear end of the bone needle body has a stop structure with a diameter larger than that of the bone needle body. A pressing mechanism for pressing the bone to be fixed against the stop structure is detachably sleeved on the front end of the bone needle body. The pressing mechanism includes a locking section that is locked and fixed relative to the bone needle body and a limiting section with a limiting surface that is in limiting cooperation with the bone to be fixed. The anti-dislocation bone traction needle of the present invention can stop and limit both sides of the bone, so that even if there is a slight looseness at the joint between the bone and the traction needle, it will not slip off, ensuring that the bone traction needle is firmly and reliably fixed.

Description

Technical Field

[0001] The invention relates to an anti-dislocation bone traction pin. Background Art

[0002] Bone traction refers to the use of medical devices to directly pull bones, so as to effectively reduce and fix patients with fractures or dislocations. Bone traction is mainly used for patients with severe skin damage or swelling, wound infection or bone comminution who are not suitable for internal fixation. At present, the instruments used for bone traction in clinical practice are mostly cylindrical steel needles with a sharp end. During use, as the bones move or as time goes by, the steel needles become loose and there is a risk of dislocation or slippage from the bones, thereby losing their function, which is very detrimental to the patient's recovery.

[0003] There are some anti-slip steel needles on the market. The main technical means is to add anti-slip lines or threads on the surface of the steel needle. Although this method has an improved anti-slip effect than the bare bone needle, due to the particularity of the bone material, it still has the problem of loosening after long-term use, and the anti-slip effect is not good. Another technical means, such as the Chinese patent application publication number CN105455873A, discloses a limited fixed metal bone needle, which includes a body, the front part of the body has a blade, the middle and rear part of the body has a protrusion, the body, the blade and the protrusion are an integrated structure, and the protrusion is convenient for fixing the bone needle on the bone. When this bone needle is in use, the protrusion can be stopped on one side, and the other side still has the problem of loosening and dislocation or slipping between the bone needle and the bone. Summary of the invention

[0004] The invention provides an anti-dislocation bone traction pin which can effectively prevent the bone traction pin from slipping out of the bone.

[0005] The anti-dislocation bone traction needle of the present invention adopts the following technical solution:

[0006] Solution 1: The anti-dislocation bone traction needle includes a bone needle body, the front end of the bone needle body is a pointed tip, the rear part of the bone needle body has a stopping structure with a diameter larger than the bone needle body, the front end of the bone needle body is detachably provided with a clamping mechanism for pressing the bone to be fixed onto the stopping structure, the clamping mechanism includes a locking section locked and fixed relative to the bone needle body and a limiting section with a limiting surface that cooperates with the bone to be fixed.

[0007] Solution 2: Based on Solution 1, the locking section and the limiting section are separately set, the limiting section and the bone needle body are slidably matched, and the limiting section and the locking section transmit the force along the axial direction. The purpose of this setting is to facilitate the processing of parts and components, and also to facilitate the replacement of parts and components materials.

[0008] Solution 3: On the basis of Solution 2, a spring is further provided between the locking section and the limiting section. The purpose of this setting is to adjust the pressing force on the bone through the spring.

[0009] Solution 4: On the basis of Solution 3, a sleeve section with an inner diameter larger than the outer diameter of the limiting section is integrally provided at one end of the locking section close to the limiting section, and the spring is located inside the sleeve section. A scale for displaying the moving distance of the locking section is provided on the outer surface of the limiting section corresponding to the moving stroke of the sleeve section. The purpose of this setting is to adjust the pressing force on the bone through the spring, and the setting of the scale makes the adjustment of the pressing force visual and more convenient.

[0010] Solutions 5 - 8: On the basis of any one of Solutions 1 - 4, an external thread is provided on a section of the front end of the bone needle body corresponding to the moving stroke of the locking section, and the locking section is a nut. The cooperation of the nut and the thread on the bone needle body not only has simple component structures and low costs, but also is very convenient to use.

[0011] Solutions 9 - 12: On the basis of any one of Solutions 1 - 4, the locking section includes an elastic claw with an inner hole. One end of the elastic claw is divided into a plurality of upturned elastic petals by a plurality of axial slits, the top of the elastic petals is set as a thickened part, the other end of the elastic claw is tubular, and its outer surface has an external thread. An external thread of the elastic claw is assembled with a pressing nut that squeezes the elastic petals towards the center to lock the elastic claw relative to the bone needle body when screwed. Solutions 13 - 16: On the basis of any one of Solutions 1 - 4, the locking section includes a ring sleeve with an inner hole, and a threaded hole is radially provided on the ring sleeve. A set screw that passes through the threaded hole and abuts against the bone needle body is screwed into the threaded hole. The method of the set screw not only does not require threading on the bone needle body, but also can be adjusted very conveniently from the direction perpendicular to the bone needle body and is fixed very firmly.

[0012] Solutions 17 - 20: On the basis of any one of Solutions 1 - 4, the locking section includes a bolt with a radial inner hole, and a fastening washer is sleeved on the bolt and an extrusion nut that is threadedly engaged with the bolt to squeeze the fastening washer against the bone needle body. The extrusion nut squeezes the fastening washer to fix the bone needle body in the radial inner hole of the bolt.

[0013] Solutions 20 - 24: On the basis of any one of Solutions 1 - 4, the shape of the stopping structure is spherical, conical, cylindrical or spindle-shaped.

[0014] Solution 25: On the basis of any one of Solutions 20-24, an annular groove for facilitating the breaking of the bone needle body is further provided on the bone needle body at the rear side of the blocking structure. It can facilitate the breaking of the bone needle, facilitate the embedding of the broken end under the skin, and reduce the probability of pinhole infection. Solutions 26-29: On the basis of any one of Solutions 1-4, the bone needle body includes a small-diameter section at the front end and a large-diameter section at the rear end, and the large-diameter section constitutes the blocking structure.

[0015] Solution 30: On the basis of any one of Solutions 26-29, an external thread is provided at the front part of the large-diameter section so as to be screwed into the bone. The setting of the external thread enables it to be screwed into the bone and plays a certain anti-slip role.

[0016] By adopting the above technical solutions, the beneficial effects of the present invention are as follows: The anti-dislocation bone traction needle of the present invention can block and limit both sides of the bone, so that even if there is a slight looseness at the joint of the bone and the traction needle, it will not slip off, ensuring that the bone traction needle is firmly and reliably fixed; it can achieve bilateral fixation of the bone, with firm fixation and not prone to the disadvantages of Kirschner wire sliding, easy exudation of the nail tract, and infection; it has the advantages of facilitating the grasping of the bone and reducing the fracture end; the force measuring device can accurately give the appropriate adjustable pressure to the bone cortex, avoiding the disadvantage of causing cortical damage by applying too much pressure to the bone cortex. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic structural diagram (set screw) of Embodiment 1 of the anti-dislocation bone traction needle of the present invention;

[0019] Figure 2 It is a schematic structural diagram (set screw) of Embodiment 2 of the anti-dislocation bone traction needle of the present invention;

[0020] Figure 3 It is a schematic structural diagram (set screw) of Embodiment 3 of the anti-dislocation bone traction needle of the present invention;

[0021] Figure 4 It is a schematic structural diagram (set screw) of Embodiment 4 of the anti-dislocation bone traction needle of the present invention;

[0022] Figure 5 It is a schematic structural diagram (nut) of Embodiment 5 of the anti-dislocation bone traction needle of the present invention;

[0023] Figure 6Schematic diagram of the structure of Example 6 of the anti - dislocation bone traction needle of the present invention (nut);

[0024] Figure 7 Schematic diagram of the structure of Example 7 of the anti - dislocation bone traction needle of the present invention (nut);

[0025] Figure 8 Schematic diagram of the structure of Example 8 of the anti - dislocation bone traction needle of the present invention (sleeve);

[0026] Figure 9 Schematic diagram of the structure of Example 9 of the anti - dislocation bone traction needle of the present invention (elastic clamping jaw);

[0027] Figure 10 Schematic diagram of the structure of Example 10 of the anti - dislocation bone traction needle of the present invention (elastic clamping jaw);

[0028] Figure 11 Schematic diagram of the structure of Example 11 of the anti - dislocation bone traction needle of the present invention (bolt);

[0029] Figure 12 Schematic diagram of the structure of Example 12 of the anti - dislocation bone traction needle of the present invention (bolt);

[0030] Figure 13 Schematic diagram of the structure of Example 13 of the anti - dislocation bone traction needle of the present invention (stop structure);

[0031] Figure 14 Schematic diagram of the structure of Example 14 of the anti - dislocation bone traction needle of the present invention (stop structure);

[0032] Figure 15 Schematic diagram of the structure of Example 15 of the anti - dislocation bone traction needle of the present invention (stop structure);

[0033] Figure 16 Schematic diagram of the structure of Example 16 of the anti - dislocation bone traction needle of the present invention (stop structure);

[0034] Figure 17 Schematic diagram of the structure of Example 17 of the anti - dislocation bone traction needle of the present invention (stop structure);

[0035] Wherein: 1 - bone needle body, 11 - tip, 12 - stop structure, 13 - large - diameter section, 14 - small - diameter section, 2 - pressing mechanism, 21 - locking section, 211 - sleeve section, 212 - nut, 213 - elastic clamping jaw, 214 - pressing nut, 216 - set screw, 217 - bolt, 218 - fastening washer, 219 - extrusion nut, 22 - limiting section, 3 - spring, 4 - barrel, H - annular groove, L - thread, K - scale. Detailed implementation manners

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] Embodiment 1 of the anti-dislocation bone traction pin of the present invention: As Figure 1 shown, the anti-dislocation bone traction pin includes a bone pin body 1. The bone pin body 1 includes a large-diameter section 13 at the rear and a small-diameter section 14 at the front. The large-diameter section 13 and the small-diameter section 14 are cylindrical. The front end of the small-diameter section 14 is a tip 11. A circular stop platform is formed at the junction of the large-diameter section 13 and the small-diameter section 14. The circular stop platform is a stop structure 12 for stopping one side of the bone. The rear end of the bone pin body is in the form of a cylinder, a triangular prism or a stepped shape. A pressing mechanism 2 for pressing the bone to be fixed against the stop structure 12 is detachably sleeved at the front end of the bone pin body 1. The pressing mechanism 2 includes a locking section 21 locked and fixed relative to the bone pin body 1 and a limiting section 22 having a limiting surface in limiting cooperation with the bone to be fixed. The locking section 21 and the limiting section 22 are separately provided. The limiting section 22 is slidably matched with the bone pin body 1. The limiting section 22 and the locking section 21 transmit force axially. The limiting section can be provided in various specifications according to the length or diameter. The purpose of such a setting is to facilitate the processing of parts and the replacement of the materials of parts. The locking section 21 includes a ring sleeve with an inner hole. The ring sleeve is sleeved on the small-diameter section 14 of the bone pin body 1. The ring sleeve has a radially arranged threaded hole, and a set screw 216 that passes through the threaded hole and abuts against the bone pin body 1 is screwed in the threaded hole. The set screw 216 can be very conveniently adjusted from the direction perpendicular to the bone pin body 1 and is also fixed very firmly. In this embodiment, the limiting section 22 is a sleeve. The set screw 216 can adopt an internal hexagonal, external hexagonal, flat head, cross head or special-shaped structure in the prior art.

[0038] During use: First, loosen the set screw 216, remove the ring sleeve and the limiting section 22 from the front end of the bone pin body 1, insert the bone pin body 1 into the bone until the stop structure 12 abuts against the bone, then successively put the limiting section 22 and the ring sleeve on the bone pin body 1, push the sliding sleeve towards the bone until the limiting section 22 abuts against the bone, and then tighten the set screw 216.

[0039] Embodiment 2 of the anti-dislocation bone traction pin of the present invention: As Figure 2 shown, the difference from Embodiment 1 is that the ring sleeve and the limiting section 22 are of an integral structure, and their inner holes are the same and are drilled through by a stepped shaft integrally.

[0040] Embodiment 3 of the anti-dislocation bone traction pin of the present invention: As Figure 3As shown, the difference from Embodiment 1 is that a spring 3 is further provided between the locking section 21 and the limiting section 22. The spring 3 is a helical compression spring 3. One end of the spring 3 abuts against the locking section 21, and the other end abuts against the limiting section 22. During use, the collar is slid backward. The collar presses against the limiting section 22 through the spring 3. One end of the limiting section 22 presses against the bone. When the collar is continuously slid backward, the spring 3 is gradually compressed to adjust an appropriate pressing force. Then, by tightening the set screw 216, the locking of the collar relative to the bone needle body 1 is achieved.

[0041] Embodiment 4 of the anti-dislocation bone traction needle of the present invention: As Figure 4 shown, the difference from Embodiment 3 is that a sleeve section 211 with an inner diameter larger than the outer diameter of the limiting section 22 is integrally provided at one end of the locking section 21 close to the limiting section 22. The spring 3 is located inside the sleeve section 211. A scale K for displaying the magnitude of the spring pressure is provided on the outer surface of the limiting section 22 corresponding to the moving stroke of the locking section 21. The purpose of such a setting is to adjust the pressing force on the bone through the spring 3. The setting of the scale K makes the adjustment of the pressing force visual and more convenient. By aligning the outer edge of the collar with the scale K on the limiting section 22 and reading the value of the scale K, the value of the scale K corresponds to different pressing forces.

[0042] Embodiment 5 of the anti-dislocation bone traction needle of the present invention: As Figure 5 shown, the difference from Embodiment 1 is that an external thread is provided on a section of the front end of the bone needle body 1 corresponding to the moving stroke of the locking section 21, and the locking section 21 is a nut 212. The cooperation of the nut 212 and the thread on the bone needle body 1 not only has a simple component structure and low cost, but also is very convenient to use.

[0043] Embodiment 6 of the anti-dislocation bone traction needle of the present invention: As Figure 6 shown, the difference from Embodiment 5 is that the locking section 21 and the limiting section 22 are of an integral structure. An internal thread is provided on the locking section 21, and the inner hole of the limiting section 22 is a smooth hole.

[0044] Embodiment 7 of the anti-dislocation bone traction needle of the present invention: As Figure 7 shown, the difference from Embodiment 5 is that a spring 3 is further provided between the locking section 21 and the limiting section 22. The spring 3 is a helical compression spring 3. One end of the spring 3 abuts against the locking section 21, and the other end abuts against the limiting section 22. During use, the collar is slid backward. The collar presses against the limiting section 22 through the spring 3. One end of the limiting section 22 presses against the bone. When the collar is continuously slid backward, the spring 3 is gradually compressed to adjust an appropriate pressing force. Then, by tightening the set screw 216, the locking of the collar relative to the bone needle body 1 is achieved.

[0045] Embodiment 8 of the anti-dislocation bone traction needle of the present invention: As Figure 8As shown, the difference from Embodiment 7 is that a sleeve section 211 with an inner diameter larger than the outer diameter of the limiting section 22 is integrally provided at one end of the locking section 21 close to the limiting section 22, and the spring 3 is located inside the sleeve section 211. The magnitude of the spring pressure can be displayed.

[0046] Embodiment 9 of the anti-displacement bone traction needle of the present invention: As Figure 9 shown, the difference from Embodiment 1 is that the locking section 21 includes an elastic claw 213 with an inner hole. One end of the elastic claw 213 is divided into a plurality of upturned elastic petals by a plurality of axial slits. The top end of the elastic petal is set as a thickened part. The other end of the elastic claw is tubular, and its outer surface has an external thread. An external thread of the elastic claw 213 is assembled with a compression nut 214 that squeezes the elastic petals towards the center when screwed to lock the elastic claw 213 relative to the bone needle body 1. During use, by screwing the compression nut 214, the compression nut 214 squeezes towards the elastic petals of the elastic claw 213, the elastic petals gradually contract, and squeeze on the bone needle body 1, and locking is achieved by relying on friction.

[0047] Embodiment 10 of the anti-displacement bone traction needle of the present invention: As Figure 10 shown, the difference from Embodiment 9 is that a sleeve 4 with an inner hole opened at the bottom is further provided at the rear side of the locking section 21. The aperture of the inner hole at the bottom of the sleeve 4 is the same as the aperture of the outer diameter of the bone needle body 1. The barrel diameter of the sleeve 4 is larger than the outer diameter of the limiting section 22. A spring 3 is provided inside the sleeve 4. One end of the spring 3 abuts against the bottom of the barrel of the sleeve 4, and the other end abuts against the front end of the limiting section 22. The limiting section 22 can be inserted into the sleeve 4. During use, the locking section 21 pushes the sleeve 4, the sleeve 4 squeezes the spring 3, and the spring 3 pushes the limiting section 22, and finally the force is transmitted to the bone to fix the bone. A spring pressure scale is provided on the outer wall of the limiting section 22, and the magnitude of the spring pressure is displayed through the sleeve 4.

[0048] Embodiment 11 of the anti-displacement bone traction needle of the present invention: As Figure 11 shown, the difference from Embodiment 1 is that the locking section 21 includes a bolt 217 with a radial inner hole. A fastening washer 218 is sleeved on the bolt 217, and an extrusion nut 219 that is threadedly engaged with the bolt 217 to squeeze the fastening washer 218 against the bone needle body 1. The extrusion nut 219 is used to squeeze the fastening washer 218 to further fix the bone needle body 1.

[0049] Embodiment 12 of the anti-displacement bone traction needle of the present invention: As Figure 12As shown, the difference from Embodiment 11 is that there is also a sleeve barrel 4 with an inner hole at the bottom behind the locking section 21. The aperture of the inner hole at the bottom of the sleeve barrel 4 is the same as the outer diameter aperture of the bone needle body 1. The barrel diameter of the sleeve barrel 4 is larger than the outer diameter of the limiting section 22. A spring 3 is arranged inside the sleeve barrel 4. One end of the spring 3 presses against the bottom of the sleeve barrel 4, and the other end presses against the front end of the limiting section 22. The limiting section 22 can be inserted into the sleeve barrel 4. When in use, the locking section 21 pushes the sleeve barrel 4, the sleeve barrel 4 squeezes the spring 3, and the spring 3 pushes the limiting section 22, and finally the force is transmitted to the bone to fix the bone. A spring pressure scale is arranged on the outer wall of the limiting section 22, and the spring pressure magnitude is displayed through the sleeve barrel 4.

[0050] Embodiment 13 of the anti - dislocation bone traction needle of the present invention: As Figure 13 shown, the difference from Embodiment 1 is that the stopping structure 12 is a boss protruding outward from the rear end or the middle part of the bone needle body 1, and the shape of the boss is spherical. Embodiments 2 - 12 can also adopt this stopping structure 12.

[0051] Embodiment 14 of the anti - dislocation bone traction needle of the present invention: As Figure 14 shown, the difference from Embodiment 1 is that the stopping structure 12 is a boss protruding outward from the rear end or the middle part of the bone needle body 1, and the shape of the boss is conical. Embodiments 2 - 12 can also adopt this stopping structure 12.

[0052] Embodiment 15 of the anti - dislocation bone traction needle of the present invention: As Figure 15 shown, the difference from Embodiment 1 is that the stopping structure 12 is a boss protruding outward from the rear end or the middle part of the bone needle body 1, and the shape of the boss is spindle - shaped. An annular groove H is arranged at the rear part of the spindle - shaped stopping structure 12, which can facilitate the breaking of the bone needle body 1, make it convenient for the broken end to be buried under the skin, and reduce the probability of needle hole infection. Embodiments 2 - 12 can also adopt this stopping structure 12.

[0053] Embodiment 16 of the anti - dislocation bone traction needle of the present invention: As Figure 16 shown, the difference from Embodiment 1 is that the stopping structure 12 is a boss protruding outward from the rear end or the middle part of the bone needle body 1, and the shape of the boss is cylindrical. Embodiments 2 - 12 can also adopt this stopping structure 12.

[0054] Embodiment 17 of the anti - dislocation bone traction needle of the present invention: As Figure 17 shown, the difference from Embodiment 1 is that external threads are arranged at the front part of the large - diameter section 13 for screwing into the bone. The setting of the external threads enables it to be screwed into the bone and plays a certain anti - slip role. Embodiments 2 - 12 can also adopt this stopping structure 12.

[0055] The anti - dislocation bone traction needle of the present invention can stop and limit both sides of the bone, so that even if there is a slight looseness at the joint of the bone and the traction needle, it will not slip off, ensuring that the bone traction needle is fixed firmly and reliably.

[0056] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. Anti-dislocation bone traction needle, including a bone needle body, the front end of the bone needle body is a tip, and the rear part of the bone needle body has a stop structure with a diameter larger than that of the bone needle body, characterized in that, A pressing mechanism for pressing the bone to be fixed against the stop structure is detachably sleeved at the front end of the bone needle body. The pressing mechanism includes a locking section fixedly locked relative to the bone needle body and a limiting section having a limiting surface that is in limiting cooperation with the bone to be fixed; The bone needle body includes a small-diameter section at the front end and a large-diameter section at the rear end. An annular retaining platform is formed at the junction of the large-diameter section and the small-diameter section, and the annular retaining platform is the stop structure; The locking section and the limiting section are separately arranged. The locking section includes a ring sleeve having an inner hole. The ring sleeve is sleeved on the small-diameter section of the bone needle body. The limiting section is in sliding cooperation with the bone needle body, and the limiting section and the locking section transmit force axially; A spring is further arranged between the locking section and the limiting section. The spring is a helical compression spring. One end of the spring abuts against the locking section, and the other end abuts against the limiting section; A sleeve section with an inner diameter larger than the outer diameter of the limiting section is integrally arranged at one end of the locking section close to the limiting section. The spring is located inside the sleeve section. A scale for indicating the magnitude of the spring pressure is arranged on the outer surface of the limiting section corresponding to the moving stroke of the locking section.

2. The anti-dislocation bone traction needle according to claim 1, wherein External threads are arranged on a section of the front end of the bone needle body corresponding to the moving stroke of the locking section. The locking section is a nut.

3. The anti-dislocation bone traction needle according to claim 1, characterized in that, The locking section includes an elastic clamping jaw having an inner hole. One end of the elastic clamping jaw is divided into a plurality of upturned elastic petals by a plurality of axial slits. The top end of the elastic petal is provided as a thickened part. The other end of the elastic clamping jaw is tubular, and its outer surface has external threads. An external thread of the elastic clamping jaw is assembled with a pressing nut that squeezes the elastic petals towards the center when rotated to lock the elastic clamping jaw relative to the bone needle body.

4. The anti-dislocation bone traction needle according to claim 1, wherein The ring sleeve has a radially arranged threaded hole, and a set screw that passes through the threaded hole and abuts against the bone needle body is screwed into the threaded hole.

5. The anti-dislocation bone traction needle according to claim 1, characterized in that, The locking section includes a bolt having a radially inner hole. A fastening washer is sleeved on the bolt, and an extrusion nut that is in threaded cooperation with the bolt to squeeze the fastening washer against the bone needle body is provided.

6. The anti-dislocation bone traction needle according to claim 1, characterized in that, The shape of the stop structure is spherical, conical, cylindrical or spindle-shaped.

7. The anti-dislocation bone traction needle according to claim 6, wherein, An annular groove for facilitating the breaking of the bone needle body is further arranged on the bone needle body behind the stop structure.

8. The anti-dislocation bone traction needle according to claim 1, characterized in that, External threads are arranged at the front part of the large-diameter section for screwing into the bone.

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