Four-limb long bone prosthesis with connecting structure
By introducing anchoring structures into the long bone prostheses of the limbs, the problem of lack of connection between the prosthesis and the steel plate was solved, achieving the stability of the prosthesis and the minimally invasiveness of the surgery, and reducing the risk of trauma and infection.
Patent Information
- Application Number
- CN202423072542.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2034-12-12
AI Technical Summary
The lack of a connecting structure between existing long bone prostheses for the limbs and the steel plates results in poor overall integrity, stress concentration at the distal end of the prosthesis, and significant surgical trauma and bleeding.
A long bone prosthesis for the limbs with a connecting structure is designed, including a long bone prosthesis body and a steel plate. By setting anchoring structures, especially end positioning structures and mid-section positioning structures, on the steel plate and the long bone prosthesis body, the initial and reinforced pre-positioning of the steel plate and the long bone prosthesis is achieved, ensuring the accuracy and stability of the screw connection.
It improves the overall stability and reliability of the prosthesis, reduces surgical trauma and infection risk, avoids stress concentration, and improves the precision and safety of the surgery.
Smart Images
Figure CN223930276U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of artificial prosthesis technology, specifically to a long bone prosthesis for the limbs with a connecting structure. Background Technology
[0002] The long bones of the limbs include the humerus, radius, ulna, femur, tibia, and fibula. Long bones are tubular and can be divided into a shaft and two ends. The shaft, also known as the diaphysis, contains a medullary cavity to hold bone marrow, and has one or two nutrient foramina on its surface for blood vessels to enter and exit. The two ends of a long bone are called epiphyses, which have smooth articular surfaces that form joints with adjacent articular surfaces. The portion where the shaft connects to the epiphysis is called the metaphysis.
[0003] In some cases of long bone fractures of the limbs, prostheses need to be implanted into the long bones. Simultaneously, a plate is placed parallel to the bone shaft and closely fitted to the bone, with its distal end extending beyond the distal end of the prosthesis. Screws are then used at the distal end of the plate to connect it to the bone shaft. Because there is no connection between the prosthesis and the plate, the overall integrity is poor, and stress concentration can easily occur at the distal end of the prosthesis, leading to fractures. To avoid this, longer plates are required, resulting in greater trauma and bleeding. Utility Model Content
[0004] To address the shortcomings of the existing technology, this invention provides a long bone prosthesis for the limbs with a connecting structure, thereby improving the overall stability and reliability of the prosthesis.
[0005] To achieve the above-mentioned technical objectives, the technical solution adopted by this utility model is as follows:
[0006] A long bone prosthesis for the limbs with a connecting structure includes a long bone prosthesis body and a steel plate. The steel plate has at least one first connecting hole, and the long bone prosthesis body has at least one radially through threaded hole. The position of the threaded hole corresponds to the position of the first connecting hole on the steel plate. The steel plate and the long bone prosthesis body are locked and fixed by screws. An anchoring structure is also provided between the long bone prosthesis body and the steel plate.
[0007] Furthermore, the anchoring structure includes an end positioning structure and a middle positioning structure. The end positioning structure is located at the end of the steel plate and the open end of the long bone prosthesis body for preliminary pre-positioning of the steel plate and the long bone prosthesis body. The middle positioning structure is located at the middle section of the steel plate and the middle section of the long bone prosthesis body for reinforced pre-positioning of the steel plate and the long bone prosthesis body.
[0008] Furthermore, the end positioning structure includes a first positioning part disposed at the open end of the long bone prosthesis body and a second positioning part disposed at the end of the steel plate, wherein the second positioning part is adapted to the first positioning part.
[0009] Preferably, the first positioning part is a positioning groove, which is located at the top of the open end of the long bone prosthesis body, and the second positioning part is a positioning protrusion, which is located at one end of the steel plate, and the positioning protrusion is adapted to the positioning groove.
[0010] Preferably, there are two pairs of positioning grooves and positioning protrusions.
[0011] In another preferred embodiment, the positioning groove and the positioning protrusion are provided with an anti-rotation structure.
[0012] In another preferred embodiment, the end positioning structure further includes a positioning adapter block, wherein the first positioning part is a positioning groove provided at the top of the open end of the long bone prosthesis body, and the second positioning part is provided at the end of the steel plate. One end of the positioning adapter block is adapted to the positioning groove on the long bone prosthesis body, and the other end is detachably connected to the second positioning part on the steel plate.
[0013] Preferably, the positioning adapter block and the steel plate are adapted to each other through a limiting groove and a limiting protrusion.
[0014] Furthermore, the mid-section positioning structure includes a positioning blind hole opened in the middle of the long bone prosthesis body and a positioning hole opened in the middle of the steel plate, and also includes a positioning pin, which passes through the positioning hole of the steel plate and is adapted to the positioning blind hole.
[0015] Furthermore, the steel plate is also provided with a second connecting hole, which is adjacent to the end positioning structure end of the steel plate. At least four second connecting holes are provided. The orthographic projection position of the second connecting hole is offset from the long bone prosthesis body. The steel plate is fixed to its own bone by passing through the second connecting hole with a second screw.
[0016] The length of the steel plate is greater than the length of the long bone prosthesis body 1. At least two third connecting holes are opened in the middle of the end of the steel plate away from the end positioning structure along the length direction. The steel plate is fixed to its own bone by passing through the third connecting holes with third screws.
[0017] The beneficial effects of this utility model are as follows:
[0018] The limb long bone prosthesis of this utility model with a connecting structure can connect the long bone prosthesis body and the steel plate into a whole, which improves the overall stability and reliability, better avoids stress concentration, makes the surgery relatively minimally invasive, and reduces the risk of blood loss and infection.
[0019] This utility model discloses a long bone prosthesis for the limbs with a connecting structure. An anchoring structure is set between the steel plate and the prosthesis body, including an end positioning structure and a middle positioning structure. The end positioning structure can realize the initial pre-positioning of the steel plate to avoid excessive offset of the tail end of the steel plate. The middle positioning structure can realize the reinforced pre-positioning of the steel plate to further correct the offset of the steel plate and avoid the problem of misalignment between the first connecting hole and the threaded hole, thereby improving the accuracy of screw drilling.
[0020] This utility model discloses a long bone prosthesis for the limbs with a connecting structure. During the installation of the steel plate, it can be inserted from the implantation end along the bone until it matches the end positioning structure, avoiding the need to open an incision of equal length to the steel plate along the length direction, reducing patient trauma and infection risk, and aiding patient recovery. Attached Figure Description
[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0022] Figure 1 This is a cross-sectional schematic diagram of the proximal tibial prosthesis in this utility model;
[0023] Figure 2 yes Figure 1 Left side view;
[0024] Figure 3 yes Figure 1 Enlarged view of point A within the dashed box;
[0025] Figure 4 This is a front view of the distal femoral prosthesis in this utility model;
[0026] Figure 5 This is a cross-sectional schematic diagram of the proximal femoral prosthesis in this utility model;
[0027] Figure 6 yes Figure 5 Enlarged view of point B within the dashed box.
[0028] Reference numerals: 1-Long bone prosthesis body, 2-Steel plate, 3-Screw, 4-Positioning adapter block, 5-Positioning nail, 6-Autologous bone, 11-Threaded hole, 12-First positioning part, 13-Positioning blind hole, 21-First connecting hole, 22-Second positioning part, 23-Positioning hole, 24-Second connecting hole, 25-Third connecting hole. Detailed Implementation
[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.
[0030] A type of long bone prosthesis for the limbs with connecting structures, such as Figures 1-6 As shown, the device includes a long bone prosthesis body 1 and a steel plate 2. The steel plate 2 has at least one first connecting hole 21, and the long bone prosthesis body 1 has at least one radially through threaded hole 11. The position of the threaded hole 11 corresponds to the position of the first connecting hole 21 on the steel plate 2. The steel plate 2 and the long bone prosthesis body 1 are locked together by screws 3. An anchoring structure is also provided between the long bone prosthesis body 1 and the steel plate 2. Connecting the steel plate 2 to the long bone prosthesis body 1 transfers the stress on the long bone prosthesis body 1 to the steel plate 2, thereby improving the overall stress-bearing capacity, shortening the steel plate length, and reducing trauma.
[0031] In one embodiment, the anchoring structure includes an end positioning structure and a middle positioning structure. The end positioning structure is located at the end of the steel plate 2 and the open end of the long bone prosthesis body 1 for preliminary pre-positioning of the steel plate 2 and the long bone prosthesis body 1. The middle positioning structure is located in the middle section of the steel plate 2 and the middle section of the long bone prosthesis body 1 for reinforced pre-positioning of the steel plate 2 and the long bone prosthesis body 1.
[0032] The end positioning structure includes a first positioning part 12 disposed at the open end of the long bone prosthesis body 1 and a second positioning part 22 disposed at the end of the steel plate 2. The second positioning part 22 is adapted to the first positioning part 12 and is used to achieve preliminary positioning of the steel plate 2 and the long bone prosthesis body 1 at the end of the steel plate, so as to avoid excessive positional deviation between the first connecting hole 21 on the steel plate 2 and the threaded hole 11 on the long bone prosthesis body 1 caused by the excessive displacement of the distal end of the steel plate.
[0033] In one embodiment, the first positioning part 12 is a positioning groove located at the top of the open end of the long bone prosthesis body 1, and the second positioning part 22 is a positioning protrusion located at one end of the steel plate 2, the positioning protrusion being adapted to the positioning groove. More preferably, two pairs of positioning grooves and positioning protrusions are provided, or the positioning grooves and positioning protrusions are provided with an anti-rotation structure, such as the positioning protrusions being square or irregularly shaped, to prevent the steel plate 2 from deflecting relative to the long bone matrix body 1.
[0034] In another embodiment, the end positioning structure further includes a positioning adapter block 4. The first positioning part 12 is a positioning groove located at the top of the open end of the long bone prosthesis body, and the second positioning part 22 is located at the end of the steel plate. One end of the positioning adapter block 4 is adapted to the positioning groove on the long bone prosthesis body 1, and the other end is detachably connected to the second positioning part 22 on the steel plate 2, thereby achieving bridging positioning between the steel plate and the long bone prosthesis body, and can be removed after the steel plate is fixedly installed. The positioning adapter block 4 and the steel plate 2 can be adapted through a limiting groove and a limiting protrusion. For example, a limiting groove is provided on the steel plate 2, and a limiting protrusion is provided on the positioning adapter block 4. The limiting protrusion is inserted into the limiting groove to achieve alignment. Of course, the positions of the limiting groove and the limiting protrusion can also be interchanged. The positioning adapter block 4 and the steel plate 2 can also be connected by screws.
[0035] Furthermore, the mid-section positioning structure includes a positioning blind hole 13 opened in the middle of the long bone prosthesis body 1 and a positioning hole 23 opened in the middle of the steel plate 2, and also includes a positioning pin 5. The positioning pin 5 passes through the positioning hole 23 of the steel plate 2 and is adapted to the positioning blind hole 13 to correct the offset of the steel plate 2, so that the first connecting hole 21 on the steel plate 2 is more accurately aligned with the threaded hole 11 on the long bone prosthesis body 1.
[0036] The limb long bone prosthesis of this utility model with a connecting structure limits and corrects the position of the steel plate 2 by means of the anchoring structure when installing the steel plate 2. After the relative position of the steel plate 2 and the long bone prosthesis body 1 is determined, the screw 3 passes through the first connecting hole 21, the autologous bone 6, the long bone prosthesis body 1 and the opposite autologous bone 6. The anchoring structure can realize the precise positioning of the screw and avoid damage caused by blind drilling.
[0037] Furthermore, the steel plate 2 is provided with a second connecting hole 24, which is adjacent to the end positioning structure end of the steel plate 2. The orthographic projection position of the second connecting hole 24 is offset from the long bone prosthesis body 1. At least four second connecting holes 24 are provided. The steel plate 2 is fixed to its own bone 6 by passing through the second connecting hole 24 with a second screw.
[0038] Furthermore, the length of the steel plate 2 is greater than the length of the long bone prosthesis body 1. At least two third connecting holes 25 are provided in the middle of the end of the steel plate 2 away from the end positioning structure along the length direction. The steel plate 2 is fixed to its own bone 6 by passing through the third connecting holes 25 with third screws.
[0039] Taking a knee joint prosthesis as an example, the long bone prosthesis body can be a tibial prosthesis of the knee joint. The tibial prosthesis of the knee joint includes a proximal tibial prosthesis end and a distal extension rod. The threaded hole 11 is opened on the extension rod, and at least two threaded holes are opened. The steel plate 2 has a first connecting hole 21 corresponding to the position of the threaded hole 11. The steel plate 2 is fixedly connected to the extension rod of the tibial prosthesis of the knee joint by screws 3. Preferably, the steel plate 2 also has at least four second connecting holes 24. The second connecting holes 24 avoid the end of the tibial prosthesis. The steel plate is fixed to the patient's own tibia by second screws passing through the second connecting holes. The length of the steel plate 2 is greater than the length of the tibial prosthesis. At least two third connecting holes 25 are opened along the length direction at the middle of the end of the steel plate 2 away from the end positioning structure. The steel plate 2 is fixed to the patient's own bone 6 by third screws passing through the third connecting holes 25.
[0040] The long bone prosthesis body can also be a knee femoral prosthesis, which includes a distal femoral prosthesis end and a proximal extension rod. At least two threaded holes are provided on the extension rod. A first connecting hole is provided on the steel plate corresponding to the threaded hole position. The steel plate 2 is fixedly connected to the extension rod of the knee femoral prosthesis by screws. Preferably, the steel plate also has at least two second connecting holes, which are offset from the femoral prosthesis end. The steel plate is fixed to the patient's own femur by second screws passing through the second connecting holes. The length of the steel plate 2 is greater than the length of the femoral prosthesis. At least two third connecting holes 25 are provided along the length direction at the middle of the end of the steel plate 2 away from the end positioning structure. The steel plate 2 is fixed to the patient's own bone by third screws passing through the third connecting holes 25.
[0041] The prosthesis body can also be other long bones of the limbs, such as shoulder joint prostheses, elbow joint prostheses, ankle joint prostheses, etc., which will not be discussed in detail here.
[0042] Of course, there may be other embodiments of this utility model. Without departing from the spirit and essence of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model, but these corresponding changes and modifications should all fall within the protection scope of the appended claims of this utility model.
Claims
1. A limb long bone prosthesis with a connecting structure, characterized in that: The device includes a long bone prosthesis body and a steel plate. The steel plate has at least one first connecting hole, and the long bone prosthesis body has at least one radially through threaded hole. The position of the threaded hole corresponds to the position of the first connecting hole on the steel plate. The steel plate and the long bone prosthesis body are locked together by screws. An anchoring structure is also provided between the long bone prosthesis body and the steel plate.
2. The limb long bone prosthesis with connecting structure according to claim 1, characterized in that: The anchoring structure includes an end positioning structure and a middle positioning structure. The end positioning structure is located at the end of the steel plate and the open end of the long bone prosthesis body for preliminary pre-positioning of the steel plate and the long bone prosthesis body. The middle positioning structure is located at the middle section of the steel plate and the middle section of the long bone prosthesis body for reinforced pre-positioning of the steel plate and the long bone prosthesis body.
3. The limb long bone prosthesis with connecting structure according to claim 2, characterized in that: The end positioning structure includes a first positioning part disposed at the open end of the long bone prosthesis body and a second positioning part disposed at the end of the steel plate, wherein the second positioning part is adapted to the first positioning part.
4. The limb long bone prosthesis with connecting structure according to claim 3, characterized in that: The first positioning part is a positioning groove, which is located at the top of the open end of the long bone prosthesis body. The second positioning part is a positioning protrusion, which is located at one end of the steel plate. The positioning protrusion is adapted to the positioning groove.
5. The limb long bone prosthesis with connecting structure according to claim 4, characterized in that: The positioning groove and positioning protrusion are provided in two pairs.
6. The limb long bone prosthesis with connecting structure according to claim 4, characterized in that: The positioning groove and positioning protrusion are equipped with an anti-rotation structure.
7. The limb long bone prosthesis with connecting structure according to claim 3, characterized in that: The end positioning structure also includes a positioning adapter block. The first positioning part is a positioning groove located at the top of the open end of the long bone prosthesis body, and the second positioning part is located at the end of the steel plate. One end of the positioning adapter block is adapted to the positioning groove on the long bone prosthesis body, and the other end is detachably connected to the second positioning part on the steel plate.
8. The limb long bone prosthesis with connecting structure according to claim 7, characterized in that: The positioning adapter block and the steel plate are adapted to each other through the limiting groove and the limiting protrusion.
9. The limb long bone prosthesis with connecting structure according to claim 2, characterized in that: The mid-section positioning structure includes a positioning blind hole opened in the middle of the long bone prosthesis body and a positioning hole opened in the middle of the steel plate, and also includes a positioning pin, which passes through the positioning hole of the steel plate and is adapted to the positioning blind hole.
10. The limb long bone prosthesis with connecting structure according to claim 1, characterized in that: The steel plate is also provided with a second connecting hole, which is adjacent to the end positioning structure end of the steel plate. At least four second connecting holes are provided. The orthographic projection position of the second connecting hole is offset from the long bone prosthesis body. The steel plate is fixed to its own bone by passing through the second connecting hole with a second screw. The length of the steel plate is greater than the length of the long bone prosthesis body. At least two third connecting holes are opened in the middle of the end of the steel plate away from the end positioning structure along the length direction. The steel plate is fixed to its own bone by passing through the third connecting holes with third screws.