Controllable rotary anti-separation miniature intramedullary nail
By designing a controllable rotating anti-separation micro intramedullary nail, using a split structure and a screw adjustment system, the problem that traditional fracture fixation methods cannot effectively control the axial force line at the fracture site is solved, and the axial force line control and arc adjustment during fracture fixation is achieved, improving convenience and treatment effect.
Patent Information
- Application Number
- CN202421575910.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-05
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-07-05
AI Technical Summary
In orthopedic surgery, traditional steel plate fixation methods cannot effectively control the axial force line at the fracture site, which may lead to the risk of fracture rotation deformity and endoplant fracture. The existing micro-intramedullary nail bending technology requires high technical level of doctors and is difficult to adjust.
A controlled rotation anti-separation micro intramedullary nail is designed, and a split structure is adopted. Through the connecting structure between the nail rods and the screw adjustment system, the arc adjustment of the nail body is realized to adapt to the arc of different bone bodies.
The axial force line control during fracture fixation is realized, which prevents fracture rotation, reduces the risk of internal plants, and simplifies the arc adjustment process of intramedullary nails, improving operational convenience and treatment effect.
Smart Images
Figure CN222787841U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of medical devices, and in particular relates to a controllable rotating anti-separation micro intramedullary nail. Background Art
[0002] In orthopedic surgery, for the fixation of thin-diameter bones such as the radius and ulna of the forearm, traditional methods such as plate fixation have many limitations, such as the inability to effectively control the axial force line at the fracture site, which may lead to fracture rotation deformity and high risk of implant fracture. As a new fracture fixation method, intramedullary nails have the advantages of controlling the axial force line at the fracture site, preventing fracture rotation, and reducing the risk of implant fracture. Currently, the design of micro intramedullary nails for thin-diameter bones such as the radius on the market generally adopts an integrated structure. Given that most human radii have a certain degree of curvature rather than being completely straight, when a straighter intramedullary nail is inserted into the medullary cavity of the radius with a larger curvature, the distal end of the intramedullary nail often presses against the front cortex of the distal end of the radius. This phenomenon not only causes stress concentration and causes postoperative pain, but also may cause the fracture point to be separated by force, affecting the treatment effect. To address this problem, the current common solution is to bend the intramedullary nail using a bending device to change its curvature and avoid contact with the cortex. However, the existing micro intramedullary nail bending technology requires a high level of technical skills from the physician, and once the bending arc of the intramedullary nail is too large, it will become extremely difficult to adjust it again.
[0003] Therefore, in order to solve the above problems, the utility model proposes a micro intramedullary nail for fixing thin-diameter bones such as the radius, which effectively prevents fracture rotation and has the convenience of conveniently adjusting the curvature of the nail body. Through the shape-adjusting intramedullary nail, the intramedullary nail can be adapted according to the actual curvature of the medullary cavity, thereby avoiding the occurrence of force separation at the fracture point and providing patients with a better treatment experience.
[0004] Currently, no effective solution has been proposed for the problems in the related technologies. Utility Model Content
[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a controllable rotation anti-separation micro intramedullary nail, comprising a nail body, the nail body comprising a head nail rod, an extended nail rod and a tail nail rod, a connecting structure is arranged between the head nail rod, the extended nail rod and the tail nail rod, the connecting structure comprises a first connecting head and a second connecting head, the first connecting head and the second connecting head are respectively arranged at the ends of the head nail rod, the extended nail rod and the tail nail rod, a connecting groove is opened inside the first connecting head, the second connecting head is installed inside the connecting groove, adjustment holes are arranged on both sides of the connecting groove, a screw is rotatably connected inside the second connecting head, the shafts at both ends of the screw pass through two adjustment holes, the shafts at both ends of the screw are connected with nut seats, the two nut seats are respectively slidably connected to the inner walls of the adjustment holes, the two nut seats and the second connecting head are provided with fixing teeth on both sides, and the fixing teeth on both sides of the two nut seats and the second connecting head are meshed.
[0006] As a preferred technical solution of the utility model, the head nail rod, the extended nail rod and the tail nail rod are connected end to end, and the number of the extended nail rods is greater than or equal to one.
[0007] As a preferred technical solution of the utility model, the threads at both ends of the screw rod are opposite, and the threads inside the nut seat adapted thereto are also opposite.
[0008] As a preferred technical solution of the utility model, fastener grooves are provided on the end faces of both ends of the screw.
[0009] As a preferred technical solution of the utility model, the head nail rod and the tail nail rod are both provided with locking screw holes.
[0010] As a preferred technical solution of the utility model, the head nail rod, the extended nail rod, the tail nail rod, the screw rod and the nut seat are all made of titanium alloy.
[0011] Compared with the prior art, the beneficial effects of the utility model are:
[0012] The utility model adopts a split intramedullary nail, which can be adjusted according to the curvature of the patient's bone through the connection structure between the nail rods, ensuring convenient operation while achieving accurate adaptation of the nail body to the actual curvature of the medullary cavity. The curvature of the nail body in the medullary cavity can effectively prevent the fracture from rotating, while making the fracture free of force, thereby preventing the fracture point from separating, providing patients with a better treatment experience. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:
[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0015] Figure 2 This is a schematic diagram of the structure after adjustment of the utility model;
[0016] Figure 3 It is a cross-sectional view of the connection structure of the utility model;
[0017] In the figure: 1. head nail rod; 2. extension nail rod; 3. tail nail rod; 4. first connecting head; 5. second connecting head; 6. connecting groove; 7. adjustment hole; 8. screw rod; 9. nut seat; 10. fixing tooth; 11. fastener groove; 12. locking screw hole. DETAILED DESCRIPTION
[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0019] Example
[0020] See also Figure 1-3 The utility model provides the following technical solutions: a controllable rotation anti-separation micro intramedullary nail, including a nail body. The nail body is subdivided into three main parts: a head nail rod 1, an extension nail rod 3 and a tail nail rod 2. In order to achieve a stable connection and angle adjustment of these parts, a connection structure is set, which includes a first connector 4 and a second connector 5. The two connectors are respectively arranged at the ends of the head nail rod 1, the extension nail rod 3 and the tail nail rod 2. A connecting groove 6 is designed inside the first connecting head 4, and the second connecting head 5 is precisely installed inside the connecting groove 6, and adjustment holes 7 are provided on both sides of the connecting groove 6. In addition, a screw rod 8 is rotatably connected inside the second connecting head 5, and the rod shafts at both ends of the screw rod 8 cleverly penetrate the two adjustment holes 7, so as to realize the rotational connection between the nail rods. Nut seats 9 are connected to the rod shafts at both ends of the screw rod 8, and the two nut seats 9 form a sliding connection relationship with the inner wall of the adjustment hole 7. In particular, fixing teeth 10 are provided on both sides of the two nut seats 9 and the second connector 5 , and these fixing teeth 10 can mesh with each other, thereby ensuring the stability of the connection structure when it is fixed.
[0021] In order to facilitate the adjustment of the length of the nail body to adapt to thin tube solids of different lengths, in this embodiment, as a preferred technical solution of the utility model, the head nail rod 1, the extended nail rod 3 and the tail nail rod 2 are connected end to end, and the number of extended nail rods 3 is greater than or equal to one.
[0022] In order to facilitate the simultaneous movement of the two nut seats toward each other when the screw is turned, in this embodiment, as a preferred technical solution of the utility model, the threads at both ends of the screw 8 are opposite, and the threads inside the nut seat 9 that matches it are also opposite.
[0023] In order to use a tool such as a medical screwdriver to twist the screw rod, in this embodiment, as a preferred technical solution of the utility model, the end faces of both ends of the screw rod 8 are provided with fastener grooves 11
[0024] In order to facilitate the fixing of the two ends of the nail body, in this embodiment, as a preferred technical solution of the utility model, the head nail rod 1 and the tail nail rod 2 are both provided with locking screw holes 12.
[0025] In order to ensure that the nail body has good biocompatibility and sufficient strength, in this embodiment, as a preferred technical solution of the utility model, the head nail rod 1, the extended nail rod 3 and the tail nail rod 2, the screw rod 8 and the nut seat 9 are all made of titanium alloy.
[0026] In summary, by adopting the technical solution described in the utility model, in actual application, the number of extended nail rods or the customized length can be flexibly adjusted according to the length of the patient's bone. Subsequently, using tools such as a medical screwdriver or a hexagonal wrench, the working end is accurately inserted into the fastener groove that matches the end of the screw to implement the rotation operation of the screw. Through the rotation of the screw, the nut seat will move along the screw shaft. When the two nut seats are away from the second connector, the two nut seats and the fixed teeth on both sides of the second connector are separated, and the angle of the upper and lower nail rods can be adjusted to the desired position. After completing the angle adjustment, rotate the screw in the opposite direction so that the nut seat is close to the second connector until the fixed teeth on both sides are engaged again, thereby firmly fixing the connection point of the nail rod and effectively preventing it from loosening or rotating. For other connection points, repeat the above operation to complete the precise adjustment of the curvature of the entire nail body.
[0027] Finally, it should be noted that in the present utility model, unless otherwise clearly stipulated and limited, terms such as "installation", "setting", "connection", "fixation", and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.
[0028] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. A controllable rotation anti-separation miniature intramedullary nail, comprising a nail body, characterized in that: The nail body comprises a head nail rod (1), an extension nail rod (3) and a tail nail rod (2); a connection structure is provided between the head nail rod (1), the extension nail rod (3) and the tail nail rod (2); the connection structure comprises a first connection head (4) and a second connection head (5); the first connection head (4) and the second connection head (5) are respectively provided at the ends of the head nail rod (1), the extension nail rod (3) and the tail nail rod (2); a connection groove (6) is provided inside the first connection head (4); and the second connection head (5) is installed in the connection groove (6). Internally, both sides of the connection groove (6) are provided with adjustment holes (7), and a screw rod (8) is rotatably connected inside the second connection head (5), and the rod bodies at both ends of the screw rod (8) pass through the two adjustment holes (7), and the rod bodies at both ends of the screw rod (8) are connected with nut seats (9), and the two nut seats (9) are respectively slidably connected to the inner walls of the adjustment holes (7), and the two nut seats (9) and the second connection head (5) are provided with fixed teeth (10) on both sides, and the two nut seats (9) and the fixed teeth (10) on both sides of the second connection head (5) are meshed.
2. The controllable rotation anti-separation miniature intramedullary nail according to claim 1, characterized in that: The head nail rod (1), the extended nail rod (3) and the tail nail rod (2) are connected end to end, and the number of the extended nail rods (3) is greater than or equal to one.
3. The controllable rotation anti-separation miniature intramedullary nail according to claim 1, characterized in that: The threads at both ends of the screw rod (8) are opposite to each other, and the threads inside the nut seat (9) adapted thereto are also opposite to each other.
4. The controllable rotation anti-separation miniature intramedullary nail according to claim 1, characterized in that: The end surfaces of both ends of the screw rod (8) are provided with fastener grooves (11).
5. The controllable rotation anti-separation miniature intramedullary nail according to claim 1, characterized in that: The head nail rod (1) and the tail nail rod (2) are both provided with locking screw holes (12) on their rod bodies.
6. The controllable rotation anti-separation miniature intramedullary nail according to claim 1, characterized in that: The head nail rod (1), the extended nail rod (3), the tail nail rod (2), the screw rod (8) and the nut seat (9) are all made of titanium alloy.