CN212140560U - Memory alloy rear cross ligament fixer - Google Patents
Memory alloy rear cross ligament fixer Download PDFInfo
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- CN212140560U CN212140560U CN201922441329.2U CN201922441329U CN212140560U CN 212140560 U CN212140560 U CN 212140560U CN 201922441329 U CN201922441329 U CN 201922441329U CN 212140560 U CN212140560 U CN 212140560U
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Abstract
The utility model discloses a memory alloy back intersection ligament fixer belongs to the medical instrument field, and it is great to have solved the messenger patient foreign body sensation that current back intersection ligament shin bone dead point tears the fixed steel sheet of fracture and exists to reach the problem that can cause the secondary damage of skeleton. The utility model discloses a fixed head, regulation pole and adjusting nut, fixed head front end split formation claw, and the claw adopts memory alloy to make, and fixed head rear end is connected with the regulation pole, is equipped with the external screw thread on the regulation pole, and adjusting nut passes through threaded connection with the regulation pole. The utility model adopts an integral design, the claw part can be curled, the diameter of the claw part is smaller when the claw part is tightened, the claw part can conveniently pass through a drilled bone tunnel, the operation installation and disassembly are not difficult, and the foreign body sensation of a patient is smaller; when the fixing is needed, the claw parts are opened, and the opened claw parts and the adjusting nuts are respectively clamped at the two ends of the bone tunnel for fixing, so that the operation is simple and convenient; the utility model has simple use method, can reduce the operation difficulty and shorten the operation time.
Description
Technical Field
The utility model belongs to the field of medical equipment, concretely relates to memory alloy back intersection ligament fixer.
Background
The posterior cruciate ligament is an important structure for maintaining the knee joint stable. The injury of posterior cruciate ligament tibial insertion avulsion fracture can directly cause the backward and rotational instability of the knee joint, and cause the degeneration of the knee joint. With the increase of traffic flow on roads, traffic accidents also frequently occur, so the probability of injury of posterior cruciate ligaments is obviously increased. The common operation mostly adopts a larger incision and is matched with screws and sutures to fix the fracture block, so the operation trauma is large and the risk of injuring neurovascular is high.
The patent (patent number: CN 201710477448.6) discloses a fracture fixing steel plate for posterior cruciate ligament tibial insertion avulsion (hereinafter referred to as fixing steel plate). The fixing steel plate includes: the bone plate is provided with a U-shaped pressing plate, the bending part of the U-shaped pressing plate covers the periphery of the front part of the tibial insertion point of the posterior cruciate ligament, two sides of the U-shaped pressing plate are respectively provided with an outward extending lug, and the lower surface of each lug is a curved surface matched with the surface of a bone covered by the lug; the middle part of the lug is provided with a screw hole, and the axis of the screw hole points to the anterior cortical bone of the upper section of the tibia; a thread tying hole is respectively arranged at the position of each side edge of the U-shaped pressing plate. The fixed steel plate of this structure has the following 3 problems:
1. physiological structures of the posterior cruciate ligament of the human body are not structurally considered, and the influence on nerves and blood vessels around the bone is large. After the fixing steel plate is implanted into a human body, the foreign body sensation of a patient is large, and the patient is inconvenient to move.
2. The screws and the sutures are adopted for auxiliary fixation, and the screws and the sutures are taken out after the healing of the affected bones, so that secondary damage to the bones can be caused.
3. The used product has more accessories, which results in long operation time and great operation difficulty.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a memory alloy back crossing ligament fixer to solve the current back crossing ligament shin bone stop and tear off the messenger patient foreign body that the fixed steel sheet of fracture exists and feel great, and can cause the problem of the secondary damage of skeleton.
The technical scheme of the utility model is that: a memory alloy rear-crossing ligament fixer comprises a fixing head, an adjusting rod and an adjusting nut, wherein the front end of the fixing head is split to form a claw part, the claw part is made of memory alloy, the rear end of the fixing head is connected with the adjusting rod, an external thread is arranged on the adjusting rod, and the adjusting nut is connected with the adjusting rod through a thread.
As a further improvement, the fixing head and the adjusting rod are cylindrical.
As a further improvement, the fixing head and the adjusting rod are provided with a step transition part, the step transition part is cylindrical, and the diameter of the step transition part is between the fixing head and the adjusting rod.
As a further improvement of the utility model, the claw part is four claws, three claws or two claws. Different claw shapes can be used for fracture blocks of different sizes.
As a further improvement of the utility model, the end head and the edge of the claw part adopt the arc design.
As a further improvement of the utility model, the adjusting rod is made of memory alloy.
As a further improvement of the utility model, the fixed head and the adjusting rod are made of titanium-nickel memory alloy.
The utility model has the advantages that:
1. the utility model relates to an internal fixator for fracture avulsion of tibial insertion point of posterior cruciate ligament, which adopts an integral design, the memory alloy claw part of the internal fixator can be curled, the diameter of the claw part is smaller when the claw part is tightened, the internal fixator can conveniently pass through a drilled bone tunnel, the internal fixator cannot cause difficult operation installation and disassembly, and the foreign body sensation of a patient is smaller; when the fixing is needed, the claw part is opened, and the opened claw part and the adjusting nut are respectively clamped at the two ends of the bone tunnel, so that the utility model is fixed together, and the operation is simple and convenient;
2. the claw part of the utility model is formed by splitting the front end of the fixing head, the diameter of the claw part is larger, and the strength of the claw part can be ensured when the fracture block is fixed;
3. the fixing head and the adjusting rod in the utility model are connected through the step transition part, so that the problem of insufficient strength of the connecting section can not be caused;
4. the end and the edge of the claw part are in arc section transition, so that the claw part is beneficial to being close to the physiological structure of the skeleton after being installed, and secondary damage to the skeleton tissue can be avoided;
5. the utility model has simple use method, can reduce the operation difficulty and shorten the operation time.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a schematic view of the jaw portion of the present invention shown in an open position;
fig. 3 is a schematic view of the jaw part of the present invention when tightened;
fig. 4 is a usage state diagram of the present invention.
In the figures, 1-jaw; 2-a step transition; 3-adjusting the nut; 4-adjusting the rod; 5-fixing the head; 6-fracture block; 7-tibia; 8-bone tunnel.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
As shown in figure 1, the memory alloy rear-crossing ligament fixer comprises a fixed head 5, an adjusting rod 4 and an adjusting nut 3, wherein the front end of the fixed head 5 (taking figure 1 as an example, the upper edge is the front end of the fixed head 5, and the lower edge is the rear end) is split to form a claw part 1, the claw part 1 is made of memory alloy, the rear end of the fixed head 5 is connected with the adjusting rod 4, the adjusting rod 4 is provided with an external thread, and the adjusting nut 3 is in threaded connection with the adjusting rod 4.
The fixed head 5 and the adjusting rod 4 are both cylindrical.
The fixed head 5 and the adjusting rod 4 are provided with a step transition part 2, the step transition part 2 is cylindrical, and the diameter of the step transition part is between the fixed head 5 and the adjusting rod 4.
The claw part 1 is four claws, three claws or two claws. The end and the edge of the claw part 1 adopt circular arc design.
The adjusting rod 4 is made of memory alloy.
The fixing head 5 and the adjusting rod 4 are made of titanium-nickel memory alloy, so that after the titanium-nickel memory alloy is implanted into a human body, the titanium-nickel memory alloy has good biocompatibility and can have a continuous pressurizing effect. The adjusting nut 3 is made of titanium alloy or stainless steel. The sizes of the fixing head 5 and the adjusting rod 4 are designed according to the diameter of the bone tunnel with the operation opening, and the fixing head and the adjusting rod are cylindrical, so that the fixing head and the adjusting rod can be conveniently installed and detached; under the condition of ensuring that the fracture block is fixed, the diameters of the fixing head 5 and the adjusting rod 4 are made as small as possible, so that the foreign body sensation of a patient is reduced.
The specific use method comprises the following steps: during operation, the fixing head 5 is placed into sterile ice saline water, the fixing head is fully cooled and then sleeved on the claw part 1 in the ice saline water by using a cylindrical tool, the memory alloy claw part 1 is tightened, the tightened state is shown in figure 3, and the whole memory alloy rear crossed ligament fixing device can be conveniently inserted into a bone tunnel 8. An incision is made at the surgical site of the patient, and then the free fracture fragment 6 is pre-reduced using surgical instruments (reconstruction tools) and the fracture fragment 6 is fixed so as not to move. The diseased bone is exposed by stripping the tissue, and a special drill is used for drilling holes in the fracture block 6 and the tibia 7, so that the fracture block 6 and the tibia 7 are drilled on the same central line, and a communicated bone tunnel 8 is formed. After taking out the memory alloy of the tightened claw part 1, crossing the ligament fixer and penetrating along the direction of the bone tunnel 8; when the memory alloy claw part 1 reaches a fracture block 6, physiological saline at the temperature of a human body is sprayed, the memory alloy claw part 1 deforms and opens by itself, the opening state is shown as figure 2, the opening claw part 1 is clamped at one end of a bone tunnel 8, as shown in figure 4, an adjusting nut 3 is screwed into an adjusting rod 4 and screwed at the other end of the bone tunnel 8, the position of the adjusting nut 3 is determined according to the length of the bone tunnel 8, and the memory alloy rear crossing ligament fixer is fixed by the threaded matching of the adjusting rod 4 at one end of the memory alloy rear crossing ligament fixer and the adjusting nut 3 and the opening claw part 1 at the other end, so that the fracture part is reset. If the adjusting rod 4 is too long and protrudes, the adjusting rod can be cut off, but a fastening and supporting section with a section of nut needs to be reserved. After the adjusting nut 3 is locked and the length of the adjusting rod 4 is adjusted, the installation is completed. After the bone of the patient heals, an incision is needed when the memory alloy crossed ligament fixer is taken out, the memory alloy is exposed after the tissue is stripped, the ligament fixer is crossed, the callus surrounding the claw part 1 is removed, the memory alloy claw part 1 is cold-compressed by gauze soaked by sterile ice salt water, and the claw part 1 is properly folded, so that the memory alloy crossed ligament fixer can be easily taken out.
Under the condition of guaranteeing the thread section strength of the adjusting rod 4, the thread of the adjusting rod 4 is as small as possible, so that the operation can be conveniently mounted and dismounted on one hand, and on the other hand, a patient can not feel a large foreign body.
The front end of the adjusting nut 3 can be matched with a flat gasket for use when necessary, so that the fixity of the adjusting nut 3 is improved.
Claims (7)
1. A memory alloy rear cross ligament fixer is characterized in that: including fixed head (5), regulation pole (4) and adjusting nut (3), fixed head (5) front end splits and forms claw portion (1), claw portion (1) adopt memory alloy to make, and fixed head (5) rear end is connected with regulation pole (4), is equipped with the external screw thread on adjusting pole (4), adjusting nut (3) pass through threaded connection with regulation pole (4).
2. The memory alloy post-intersection ligament fastener of claim 1, wherein: the fixed head (5) and the adjusting rod (4) are both cylindrical.
3. The memory alloy post-intersection ligament fastener of claim 2, wherein: the fixed head (5) and the adjusting rod (4) are provided with a step transition part (2), the step transition part (2) is cylindrical, and the diameter of the step transition part is between the fixed head (5) and the adjusting rod (4).
4. The memory alloy post-intersection ligament fastener according to any one of claims 1-3, wherein: the claw part (1) is four claws, three claws or two claws.
5. The memory alloy post-intersection ligament fastener of claim 4, wherein: the end head and the edge of the claw part (1) adopt circular arc design.
6. The memory alloy post-intersection ligament fastener of claim 5, wherein: the adjusting rod (4) is made of memory alloy.
7. The memory alloy post-intersection ligament fastener of claim 6, wherein: the fixed head (5) and the adjusting rod (4) are made of titanium-nickel memory alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922441329.2U CN212140560U (en) | 2019-12-30 | 2019-12-30 | Memory alloy rear cross ligament fixer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922441329.2U CN212140560U (en) | 2019-12-30 | 2019-12-30 | Memory alloy rear cross ligament fixer |
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| Publication Number | Publication Date |
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| CN212140560U true CN212140560U (en) | 2020-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922441329.2U Active CN212140560U (en) | 2019-12-30 | 2019-12-30 | Memory alloy rear cross ligament fixer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114681030A (en) * | 2022-03-02 | 2022-07-01 | 武汉嘉一三维技术应用有限公司 | Posterior cruciate ligament tibia insertion avulsion fracture fixing device and using method |
-
2019
- 2019-12-30 CN CN201922441329.2U patent/CN212140560U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114681030A (en) * | 2022-03-02 | 2022-07-01 | 武汉嘉一三维技术应用有限公司 | Posterior cruciate ligament tibia insertion avulsion fracture fixing device and using method |
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