Portable internal fracture fixation system

Abstract

The utility model discloses a portable fracture internal fixation system which comprises a bone fracture plate and a fixing piece, a through hole is formed in the bone fracture plate, the fixing piece comprises a shaft rod and a sleeve, the shaft rod is sleeved with the sleeve in a sliding mode, a protruding edge is arranged on the outer wall of one end of the shaft rod, and the protruding edge and the sleeve can be matched with the through hole. And the ribs can be in interference fit with the sleeve. The utility model provides a portable fracture internal fixation system which is made of absorbable materials, can be degraded and absorbed in a human body, does not need to be taken out for the second time, does not need tapping, obviously shortens the internal fixation time, reduces the risk of infection in an operation, and is simple in structure and convenient to operate.

Description

Technical Field

[0001] The utility model belongs to the field of medical instruments, and in particular relates to a convenient fracture internal fixation system. Background Art

[0002] In modern medicine, it is very common for doctors to use internal fixation technology to treat fractures. For fractures of the sternum and ribs, an internal fixation plate system is usually used, which uses a plate and screws to fix the bones at both ends of the fracture to help the body rebuild bones and restore health.

[0003] At present, the internal fixation products used in clinical practice are mainly made of metal materials, which have poor biocompatibility and are not conducive to postoperative healing. After healing, a second surgery is required to remove them, otherwise there will be long-term foreign body reactions and stress shielding leading to osteoporosis and other problems. The second surgery to remove the metal internal fixation will cause secondary damage to the patient and increase the cost of the operation. In recent years, there are also some absorbable fracture internal fixation products on the market, and most of them are bone screws and bone plates. During the operation, taps need to be pre-tapped, the process is complicated, and the bone screws and taps need to have good compatibility. It is also easy to cause difficulty in screwing in the bone screws or broken screws due to the presence of bone fragments in the bone tunnel. Multiple bone screws often need to be implanted during the operation, which results in a long operation time and increased infection probability and other negative effects.

[0004] Therefore, it is a technical problem that needs to be solved urgently by those skilled in the art to provide a fracture internal fixation system that has a simple and reasonable structure, is convenient for intraoperative operation, and reduces implantation risks. Utility Model Content

[0005] The utility model provides a convenient fracture internal fixation system, which does not require tapping, significantly shortens the internal fixation time, reduces the risk of intraoperative infection, and has a simple structure and is easy to operate.

[0006] In order to solve the above technical problems, the technical solution provided by the utility model is: a convenient fracture internal fixation system, comprising: a bone plate and a fixing member, the bone plate is provided with a through hole, the fixing member comprises a shaft rod and a sleeve, the sleeve can be slidably mounted outside the shaft rod, a convex ridge is provided on the outer wall of one end of the shaft rod, the convex ridge and the sleeve can match the through hole, and the convex ridge can be interference fit with the sleeve.

[0007] Furthermore, one end of the sleeve is close to the convex ridge, and the other end is provided with a sleeve cap.

[0008] Furthermore, the outer diameter of the sleeve cap is greater than the diameter of the through hole.

[0009] Furthermore, a pull rod is detachably provided at the other end of the shaft.

[0010] Furthermore, the convex ridge is truncated cone-shaped, semi-elliptical or hemispherical.

[0011] Furthermore, the diameter of the ridge is the same as the outer diameter of the sleeve.

[0012] Furthermore, the diameter of the convex ridge is larger than the inner diameter of the sleeve and smaller than the outer diameter of the sleeve.

[0013] Furthermore, the convex ridge is in a truncated cone shape, and the height of the truncated cone is not less than 3 mm.

[0014] Furthermore, the bone plate and the fixing member are both made of polymer absorbable material.

[0015] Furthermore, after implantation and fixation, the ridge and the sleeve are interference fit, and after ultrasonic welding, the ridge and the sleeve are melted to form a plug structure, which can block the bone tunnel opening to prevent the fixing piece from falling out of the bone tunnel.

[0016] Beneficial effects of the utility model: The utility model provides a convenient fracture internal fixation system, which eliminates the tapping and wire withdrawal process during surgery, can effectively shorten the internal fixation time, reduce the risk of intraoperative infection, and will not cause the phenomenon of broken nails due to large screw-in resistance caused by debris in the bone tunnel. The utility model is made of absorbable materials, and after implantation, the excess part exposed outside can be melted by ultrasonic welding to avoid damage to surrounding tissues. The utility model has a simple and reasonable structure, is easy to operate, has a wide range of applications, and is firmly fixed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the bone fracture plate of the utility model;

[0018] Figure 2 It is a structural schematic diagram of the fixing member of the utility model.

[0019] Reference numerals include:

[0020] 100—bone plate 110—through hole 200—fixing piece

[0021] 210—sleeve 220—shaft 221—convex ridge

[0022] 211—Cap 222—Pull-out rod DETAILED DESCRIPTION

[0023] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0025] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] like Figure 1 and 2 As shown, the utility model provides a convenient fracture internal fixation system, including: a bone plate 100 and a fixing member 200. Figure 1 As shown, the bone plate 100 is a long plate-like structure, and a through hole 110 used in conjunction with the fixing member 200 is provided on the bone plate 100. Figure 2 As shown, the fixing member 200 is a structure in which multiple parts are matched, which mainly includes a shaft 220 and a sleeve 210. The sleeve 210 can be slidably sleeved on the shaft 220. A ridge 221 is provided on the outer wall of one end of the shaft 220. The sleeve 210 is located above the ridge 221. The diameter of the ridge 221 is larger than the inner diameter of the sleeve 210, ensuring that in the initial state, the sleeve 210 and the ridge 221 are close but not overlapped. The sleeve 210 and the ridge 221 can match the through hole 110 of the bone plate 100, and the ridge 221 can enter the interior of the sleeve 210 under the action of an external force, and have an interference fit with the sleeve 210 to expand the end of the sleeve 210.

[0028] like Figure 2As shown, one end of the shaft 220 is integrally formed with the ridge 221 to ensure its strength, and the other end is detachably connected with a pull rod 222. The pull rod 222 is mainly used to cooperate with surgical tools or the operator's hand to insert or extract the shaft 220, which is convenient for surgical operation; and the pull rod 222 is detachably connected to the shaft 220 (for example: one end of the pull rod 222 is matched and inserted into the interior of the shaft 220, and can be extracted under the action of external force; or, the pull rod 222 and the shaft 220 are screwed together through thread matching, and the end of the pull rod 222 is provided with an external thread, and the end of the shaft 220 is provided with an internal thread interface, which matches the external thread). After the implantation is completed, the pull rod 222 can be removed to avoid affecting the effect after implantation.

[0029] like Figure 2 As shown, one end of the sleeve 210 is close to the ridge 221, and the other end is provided with a cap 211, which is an integral structure with the sleeve 210. The diameter of the cap 211 is larger than the diameter of the through hole 110, and when implanted, it can be stuck on the outer end of the through hole 110 to limit the movement of the sleeve 210 along the axial direction of the through hole 110.

[0030] Preferably, the shape of the convex rib 221 can be a truncated cone, a semi-ellipse or a hemispherical shape, which is not specifically limited here. As long as it can be retracted into the interior of the sleeve 210 under the action of an external force and the sleeve 210 is stretched open, it is within the protection scope of this patent. In this embodiment, the diameter of the convex rib 221 (the diameter here is the maximum diameter, that is, the bottom diameter of the truncated cone, semi-ellipse or hemispherical shape) is larger than the inner diameter of the sleeve 210 and smaller than the outer diameter of the sleeve 210. The outer diameter of the sleeve 210 matches the size of the through hole 110 of the bone plate 100. Therefore, the ridge 221 and the sleeve 210 can match the through hole 110, and the ridge 221 and a part of the sleeve 210 pass through the through hole 110 and are located outside the bone tunnel. Pulling back the pull rod 222 causes the ridge 221 to retract and squeeze into the sleeve 210, thereby expanding the sleeve 210 and clamping it on the outside of the bone tunnel to prevent the sleeve 210 and the shaft rod 220 from sliding relative to the through hole 110. At this time, one end of the sleeve 210 is restricted by the sleeve cap 211 to the outside of the through hole 110 of the bone plate 100, and the other end is clamped on the outside of the bone tunnel by the enlarged end of the sleeve 210. As a result, the sleeve 210 fixes the bone plate 100 to the fracture.

[0031] In another embodiment, the diameter of the ridge 221 is the same as the outer diameter of the sleeve 210, and can also pass through the through hole 110 and squeeze into the sleeve 210 to expand its size to fix the bone plate 100, thereby achieving the effect of fracture fixation.

[0032] Preferably, the ridge 221 is in the shape of a truncated cone, the number of which is 3-8, and the height of each truncated cone is not less than 3 mm. The truncated cone has a center line, and the acute angle formed by the center line of the center line of the shaft 220 is greater than 10° and less than 80°. The diameter of the larger bottom surface of the truncated cone is greater than the inner diameter of the sleeve 210.

[0033] Preferably, the truncated cone-shaped ridge 221 includes three cones, and the bottom surfaces of the three cones are arranged at a distance of 1 mm in sequence. The acute angle formed by the generatrix of the cone and the center line of the shaft 220 is 30° to 45°. The design of this angle can not only make it easier to squeeze the ridge 221 into the sleeve 210, but also ensure that it is not easy to fall out of the sleeve 210, making the operation easier while ensuring the fixing effect.

[0034] As a preferred example, Figure 1 As shown, the two ends of the long strip bone plate 100 are rounded structures, and the four sides are also chamfered, so the cutting of the surrounding tissue can be effectively avoided. The number of through holes 110 is at least 2, and when the number of through holes 110 is 2, the two through holes 110 are distributed at the two ends of the bone plate 100, and when the number of through holes 110 is multiple, the multiple through holes 110 are evenly distributed along the length direction of the bone plate 100, which can be fixed more firmly.

[0035] Preferably, the bone plate 100 and the fixing member 200 of the utility model are made of absorbable polymer materials, and the absorbable materials are one or more of polylactic acid and its copolymers, polycaprolactone and its copolymers, polyglycolic acid and its copolymers, polydioxanone and its copolymers. The absorbable materials can be degraded and absorbed in the human body, which can effectively avoid the damage caused by secondary removal.

[0036] When in use, first drill a bone tunnel at the fracture site, then place the bone plate 100 at the fracture site, and align the through hole 110 of the bone plate 100 with the bone tunnel, push the pull rod 222 to make one end of the ridge 221 of the fixing member 200 and the sleeve 210 pass through the through hole 110 of the bone plate 100, and then continue to pass through the bone tunnel. After the sleeve 210 passes through a certain length from the other end of the bone tunnel, the sleeve cap 211 will be stuck outside the through hole 110, fix the sleeve cap 211 with a tool, pull back the pull rod 222, so that the ridge 221 enters the sleeve 210 and fits with the sleeve 210, and the end of the sleeve 210 is expanded so that the outer diameter of this part is larger than the diameter of the bone tunnel and the diameter of the through hole 110, and cannot move up as a whole, thereby fixing the bone plate 100 to the fracture site, and then remove the tool and the pull rod 222 to complete the internal fixation of the fracture.

[0037] In another embodiment, the bone plate 100 and the fixing member 200 are both made of absorbable material, and the absorbable material can melt under ultrasonic welding conditions. After implantation and fixation, the ridge 221 and the corresponding sleeve 210 portion can melt under ultrasonic welding to form a plug structure, which can seal the bone tunnel opening.

[0038] Specifically, during the implantation and fixation process, the pull rod 222 is pulled back so that the ridge 221 enters the sleeve 210, and then the interference-fit ridge 221 and the sleeve 210 are melted into one by ultrasonic welding, and then a plug structure with a size larger than the bone tunnel aperture and the diameter of the through hole 110 is formed outside the bone tunnel. The plug structure can be disc-shaped, and the disc-shaped plug is close to the surface of the bone tunnel, blocking one end of the bone tunnel to prevent the fixing member 200 from moving relative to the bone plate 100, thereby achieving fixation. The final fixing structure in this embodiment can make the internal fixation system suitable for fracture sites of different sizes, and avoid secondary damage such as cutting of surrounding tissues by the fixing member 100 protruding outside the bone tunnel after fixation.

[0039] The convenient fracture internal fixation system provided by the utility model has a simple structure and is easy to operate. It can also save the tapping and wire withdrawal process during surgery, effectively shorten the time of internal fixation, reduce the risk of intraoperative infection, and prevent the phenomenon of broken nails due to large screw-in resistance caused by debris in the bone tunnel. Moreover, the convenient fracture internal fixation system of the utility model can be applied to fracture sites of different sizes and bone tunnels of different depths. After implantation, the excess exposed parts can be melted by ultrasonic welding to avoid damage to surrounding tissues. At the same time, the utility model is made of absorbable materials, which can avoid the surgical risks caused by secondary removal, and has a wide range of applications and strong applicability.

[0040] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, many changes can be made in the specific implementation methods and application scopes based on the ideas of the present invention. As long as these changes do not deviate from the concept of the present invention, they all belong to the protection scope of the present invention.

Claims

1. A portable fracture internal fixation system, characterized in that: include: A bone plate (100) and a fixing member (200), wherein the bone plate (100) is provided with a through hole (110), and the fixing member (200) comprises a shaft (220) and a sleeve (210), wherein the sleeve (210) is slidably sleeved outside the shaft (220), and a convex ridge (221) is provided on the outer wall of one end of the shaft (220), wherein the convex ridge (221) and the sleeve (210) can match the through hole (110), and the convex ridge (221) can be interference fit with the sleeve (210).

2. The portable fracture internal fixation system according to claim 1, characterized in that: One end of the sleeve (210) is close to the convex ridge (221), and the other end is provided with a sleeve cap (211).

3. The portable fracture internal fixation system according to claim 2, characterized in that: The outer diameter of the sleeve cap (211) is greater than the diameter of the through hole (110).

4. The portable fracture internal fixation system according to claim 3, characterized in that: The other end of the shaft rod (220) is detachably provided with a pull rod (222).

5. The portable fracture internal fixation system according to claim 4, characterized in that: The convex ridge (221) is in the shape of a truncated cone, a semi-ellipse or a hemisphere.

6. The portable fracture internal fixation system according to claim 5, characterized in that: The diameter of the ridge (221) is the same as the outer diameter of the sleeve (210).

7. The portable fracture internal fixation system according to claim 5, characterized in that: The diameter of the convex ridge (221) is larger than the inner diameter of the sleeve (210) and smaller than the outer diameter of the sleeve (210).

8. The portable fracture internal fixation system according to claim 3, characterized in that: The convex ridge (221) is in the shape of a truncated cone, and the height of the truncated cone is not less than 3 mm.

9. The portable fracture internal fixation system according to claim 6 or 7, characterized in that: The bone fracture plate (100) and the fixing member (200) are both made of polymer absorbable material.

10. The portable fracture internal fixation system according to claim 9, characterized in that: After implantation and fixation, the convex ridge (221) and the sleeve (210) are interference-fitted, and after ultrasonic welding, the convex ridge (221) and the sleeve (210) are melted to form a plug structure.

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