CN217987683U - intramedullary support system - Google Patents

Abstract

The utility model belongs to the technical field of orthopedics apparatus, a marrow inner chamber braced system is specifically disclosed, including widening propping mechanism and interior tectorial membrane. The wide supporting wall of the wide supporting mechanism is of an elastic structure, and the interior of the wide supporting mechanism is a variable inner cavity; the inner coating is arranged on the inner wall of the variable inner cavity; the inner covering film is provided with bone cement or bone grafting material. The use method of the marrow inner cavity support system comprises the steps of implanting the system through a minimally invasive bone hole, expanding the system to form a support after reaching a designated marrow cavity position, and fixing broken bones to the system. The support of the utility model can be implanted into the human body through a smaller wound, and can also keep a better fit with the marrow cavity; so that some broken bones are more convenient to fix and a fixed supporting part is provided.

Description

intramedullary support system

technical field

The utility model belongs to the technical field of orthopedic instruments, in particular to a bone marrow cavity support system.

Background technique

Intramedullary nail fixation is a surgery in which intramedullary nails of suitable size and length are placed in the bone marrow cavity on both sides of the fractured end, so that the fractured body parts can be fixed.

A femoral intramedullary fixation device is disclosed in the patent document with publication number CN208610972U (hereinafter referred to as reference document 1). The reference document 1 includes the intramedullary main nail installed inside the femoral shaft, the compression screw structure that passes through the second through hole and is fixed, and the cortical bone screw that passes through the third through hole and is fixed, and also includes the structure that passes through the second through hole. A through-hole and fixed support locking nail, the distal head of the support locking nail is pressed against the slot of the transverse sheath, so that the proximal end of the intramedullary main nail, the transverse sheath and the support locking nail form a triangle mechanically stable structure.

However, if the femoral intramedullary fixation device disclosed in Reference Document 1 locks the intramedullary nail from the outside when performing intramedullary nail fixation, it cannot form a supporting effect from the inside and reset it for fractures with articular surface collapse of.

In the prior art, the locking screws used for intramedullary nail fixation are generally locked in a rotation direction perpendicular to the axis of the intramedullary nail, that is, the multi-directional, multi-dimensional multi-face fixation requirements of bone joints cannot be realized. The effect of unidirectional intramedullary nailing depends on whether the patient's bone strength is good. For elderly patients with osteoporosis with decreased bone strength, there is a problem of postoperative intramedullary nail fixation failure.

Utility model content

In view of the above problems, the utility model provides a bone marrow cavity support system, which mainly solves the problem that the existing fixation device cannot solve the problem of stable fixation of broken bones and lack of fixation support.

In order to solve the above problems, the utility model adopts the following technical solutions:

Intramedullary support systems, including

The brace mechanism includes a brace wall made of elastic material, and a variable inner cavity is formed inside the brace wall.

In some manners, an inner covering film is also included, and the inner covering film is arranged on the inner side of the braced wall and covers the variable lumen.

In some manners, the wide support wall has several hollow parts.

In some manners: the wide support wall has several deformation parts.

In some modes, the wide brace wall is formed by interweaving several deformed strips, and the deformed strips of the deformed part are bent inward;

After interweaving, hollow parts are formed between several adjacent deformed strips.

In some modes, under the action of an external force, the wide brace wall can shrink inwardly, and the wide brace wall has a tendency to return to its original shape; Support the tail.

In some manners, the wide support wall is a memory metal plate, and the memory metal plate is provided with several hollow parts.

In some manners, the deformation portion is inwardly recessed.

In some modes, the inner covering film includes an inner covering film port portion, and the inner covering film port portion is located in the end portion of the brace; the inner covering film is provided with a feeding port for delivering bone cement or implant bone material.

The beneficial effects of the utility model are:

1. The support can be implanted into the human body through a smaller incision while maintaining a better fit with the bone marrow cavity;

2. Make some broken bones easier to fix and provide a fixed support.

Description of drawings

Fig. 1 is a kind of part figure of the utility model;

Fig. 2 is a schematic diagram of an assembly state of the utility model;

Fig. 3 is a structural schematic diagram of another viewing angle of the utility model;

Fig. 4 is the schematic diagram of the installation state of the present utility model, (A) is the installation of the distal end of the radius, (B) is the installation of the cone bone, and (C) is the installation of the proximal end of the humerus;

Fig. 5 is a structural schematic diagram of a wide buttress wall of the present invention;

Fig. 6 is another structural schematic diagram of the wide buttress wall of the present invention;

Fig. 7 is a schematic diagram of a ring-shaped rolled-up state of the wide brace wall of the present invention;

Fig. 8 is a structural schematic diagram of the utility model after deformation.

In the picture:

100 intramedullary support system, 200 bracing mechanism, 300 inner membrane, 20 bracing wall, 21 bracing end, 22 bracing tail, 23 hollow part, 24 memory elastic strip, 25 deformation part, 30 inner covering The main body, 31 inner covering port part.

detailed description

Below in conjunction with accompanying drawing, the utility model is further described:

Please refer to FIG. 1 , a bone marrow cavity support system 100 is disclosed in this embodiment.

The intramedullary cavity support system 100 at least includes a brace mechanism 200 when performing intramedullary nail fixation.

The brace mechanism 200 includes a brace wall 20 . The wide brace wall 20 is an elastic structure, and a variable lumen is formed inside the wide brace wall 20 .

The structural feature of the wide support wall 20 in this embodiment is that it is made into a specific structural shape according to the needs during manufacture. The specific specific structural shape is adjusted according to the structural shape of the cavity that can accommodate the fixing system produced by different human body parts and diseases. The body is also the support domain in some embodiments.

The wide brace wall 20 can be arbitrarily partially inwardly contracted when an inward external force is applied, so that the cross-sectional outer diameter of the wide brace wall 20 is reduced, and any part of the wide brace wall 2 can be reduced from a smaller diameter range pass through the channel.

At the same time, when an external force is applied so that the wide braced wall 20 can shrink inwardly, the wide braced wall 20 remains in a contracted state, and produces a recovery tendency to restore deformation; then after the applied external force is released, the wide braced wall 20 according to The recovery tendency can be restored from the contracted state to the natural state of the wide strut wall 20 before deformation, or to the compressed state where the wide strut wall 20 is in contact with part of human bones or tissues.

Please refer to FIG. 2 and FIG. 3 , in this embodiment, an inner covering film 300 is arranged on the inner side of the wide supporting wall 20 , and the inner covering film 300 is attached to the inner wall of the wide supporting wall 20 so that the inner covering film 300 can cover the The variable lumen. Then, in this embodiment, the inner covering film 300 prevents the bone cement or other bone graft materials that can be accommodated in the variable inner cavity from overflowing.

FIG. 5 shows that the wide buttresses 20 in this embodiment are formed by interweaving metal wires capable of memory deformation, forming a weaving structure that is flattened and formed into a mesh.

Fig. 6 shows that in the present embodiment, the wide buttress 20 is interwoven by metal wires to form a larger weaving structure than the mesh in Fig. The deformation of the end is different, as shown in Figure 6, the upper mesh is larger, so that it has a larger deformation and a larger adjustment space.

The braided structure forms the roll structure of FIG. 7 after being rolled. When the reel structure is formed into a specific shape with a large front section diameter and a small rear section diameter as shown in Figure 1, it is necessary to converge the front and rear ends of the reel structure.

Therefore, in some embodiments, the brace mechanism 200 further includes a brace end portion 21 and a brace tail portion 22 respectively disposed at two ends of the brace wall 20 . The wide support wall 20 is made of deformable material, and its two ends need to have connecting parts, so that after the two ends are restricted from expanding, only the middle part can expand.

The wide supporting wall 20 has several hollow parts 23, and the hollow parts 23 are distributed on the wide supporting wall 20, which improves the deformation range of the wide supporting wall 20 after being subjected to an external force. Compared with the side wall without the wide supporting wall 20, there are After several hollow parts 23 are formed, the through holes of the hollow parts 23 will also be deformed during the extrusion process. Generally speaking, as shown in the structure shown in Figure 2, under the premise that the hollow parts 23 are large, they themselves have greater deformation Amplitude, for example, the deformation allowance in the middle is greater than the deformation allowance at both ends.

The deformation part 25 is customized according to the internal structure 100 of the bone marrow cavity during the manufacturing process of the fixing system. By adjusting the distribution of the deformation part 25 and the degree of indentation, the overall shape of the wide brace wall 20 can be adjusted, so that the wide brace The wall 20 can better match the bone marrow cavity, and when the broad brace wall 20 is implanted, it can be more stably placed in the bone marrow cavity.

As shown in Figure 6, the wide brace wall 20 is formed by interweaving several deformed strips 24, and the deformed strips 24 of the deformed part 25 are bent inward; Among them, longitudinal deformation strips 24 are provided, and the deformation strips 24 are bent and arranged, and the curved parts of two adjacent deformation strips 24 are connected to each other, thereby forming a hollow part 23 between the two connecting parts;

Or after weaving horizontally and vertically, several adjacent deformation strips 24 form a hollow part 23;

The arrangement similar to the fabric also makes the wide brace wall 20 have a larger deformation margin, and can expand the local hollow part 23 under the action of external force, and a certain extension occurs, so that the wide brace wall 20 can shrink.

In another case, as shown in Figure 5, the wide support wall 20 is a memory metal plate, which has a memory deformation function. In order to improve its irregular deformation capacity, the memory metal plate is provided with several hollow parts 23. For example, when it is made into the product in Figure 8, more hollow parts 23 are set to improve the local deformation capacity of the wide brace wall 20. When it is made into an irregular shape, it can still shrink to the inside and reduce the outer surface. diameter for easy insertion into the bone.

Among them, the materials used in some embodiments of the elastic metal and the inner covering film are shown in the following table,

In some embodiments, it is also necessary to fix the broken bone on the support system of the intramedullary cavity by fixing nails. After the nail entry point is determined, intramedullary nails of suitable size and length are inserted into the bone marrow cavity on both sides of the broken end of the fracture. The nail can pass through the hollow part 23 and drive into the bone cement or bone graft material to play a role of fixing and supporting.

As shown in Figure 4, when used in the distal radius and proximal humerus, three-dimensional internal fixation can solve the collapse of the end face of the bone joint; and then use multi-axial fixation with screws to meet the needs of fracture fixation around the joint; Bone strength requirements are reduced, and it is suitable for patients with osteoporosis; it acts on three- and four-part fractures of the proximal humerus, replacing joint replacement.

In other embodiments, no screws can be used for fixation, as shown in Figure 4, when used in pyramidal bone shaping, the support of the inner bone body can be realized by implanting a three-position internal fixation system, which plays a role in pyramidal bone shaping. to support.

In one embodiment, as shown in FIG. 8 , the wide brace wall 20 has several deformed parts 25 . The deformation part 25 is generally in a convex-concave shape, and the overall shape can be adjusted by adjusting the shape and size of the deformation part 25 .

The deformation part 25 is concave inward, and only by controlling the deformation part 25 to be concave inward, it can form a convex shape on its edge; the deformation in Figure 8 is only for the convenience of expression and does not mean that it is limited to this concave mode , its specific concave position, shape, area, and depth are all adjusted according to actual needs, but these all belong to a kind of deformation part 25.

As shown in FIG. 2 , the inner covering film 300 includes an inner covering film port portion 31, and the inner covering film port portion 31 is located in the bracing end portion 21; the inner covering film 300 is provided with a feeding Port for delivery of bone cement or bone graft material. The inner covering film 300 forms a container for accommodating bone cement or bone grafting material, but the inner covering film 300 itself is not easy to shape and needs to be used in conjunction with the wide brace wall 20 . The shape of the inner film 300 changes according to the shape of the wide brace 20 .

The inner membrane 300 includes an inner membrane body 30 and an inner membrane port portion 31 .

In some other embodiments, the wide support wall 20 can be expanded through a mechanical expansion structure, or other means that can achieve the same effect, and then follow-up work can be performed.

Similarly, this internal fixation system can be used in the whole body fracture repair site or any site that needs support, or other sites, and is not limited to a specific use environment, nor does it limit its scope of use because of the name "intramedullary cavity" . For example, the ones listed in Figure 4 are used for repair and fixation of the proximal humerus and distal radius, and provide internal support during vertebral body osteoplasty. In addition, this internal fixation system can also provide internal support for necrosis of the femoral head.

Combined with the content shown in Figure 4, when the brace wall 20 is restored to its form, the bone cement or bone graft material enters the inner covering film 300 through the feed port, and then the bone cement or bone graft material will solidify, thereby making the bone The cement or bone graft material has the same shape as the wide support wall 20, so that the inner wall of the variable inner cavity is supported by the bone cement or bone graft material. The wide supporting wall 20 plays a supporting role in the bone marrow cavity, and at this time, the wide supporting wall 20 provides a supporting installation and fixing part for the installation of the broken bone.

When it is bone cement, coagulation generally means that it is solidified. When the bone graft material is broken bone, etc., coagulation means the connection and reunion of broken bones, and the broken bones form a relatively solid whole.

Combined with what is shown in Figure 4, the method of using the intramedullary cavity support system will be further explained.

The overall shape of the outer wall of the braced wall 20 is set, and several deformed parts 25 are adjusted at the position of the braced wall 20, and the shape and size of the deformed parts 25 are adjusted at the same time; Variety.

The shape of the brace wall 20 is adjusted as required to match the shape of the inner cavity of the bone marrow cavity. Matching means that the outer wall of the brace wall 20 can fit the inner wall of the cavity where implantation is required.

When performing implant work in one mode, the bone hole is drilled;

The intramedullary cavity support system is sent into the bone marrow cavity through a conveyor, and when the brace wall 20 enters the bone, the squeezing force on the brace wall 20 is removed, and then the brace wall 20 will brace outward and recover In the form of no external force extrusion, the wide support wall 20 matches the shape of the bone marrow cavity.

Bone cement or bone graft material is sent into the inner covering film 300 through the feed port, after the bone cement or bone graft material is filled, the screw is tightened to seal the feed port, and after the bone cement or bone graft material is solidified, the bone cement or bone graft material Becomes solid after congealing.

Those skilled in the art can clearly understand that various modifications to the above embodiments can be made without departing from the general spirit and concept of the present utility model. They all fall within the protection scope of the present utility model. The protection scheme of the utility model is subject to the appended claims of the utility model.

Claims (8)

1. A intramedullary cavity support system, comprising: comprises that

The broad bracing mechanism (200), the broad bracing mechanism (200) comprises a broad bracing wall (20) made of elastic material, a variable inner cavity is formed inside the broad bracing wall (20),

under the action of external force, the wide support wall (20) can contract inwards, and the wide support wall (20) has the tendency of recovering the original shape; the wide supporting mechanism (200) also comprises a wide supporting end part (21) and a wide supporting tail part (22) which are respectively arranged at the two ends of the wide supporting wall (20).

2. The intramedullary cavity support system of claim 1, wherein: the inner covering film (300) is arranged on the inner side of the broad support wall (20) and covers the variable inner cavity.

3. The intramedullary cavity support system of claim 2, wherein: the wide supporting wall (20) is provided with a plurality of hollow parts (23).

4. The intramedullary cavity support system of claim 3, wherein: the broad bracing wall (20) is provided with a plurality of deformation parts (25).

5. The intramedullary cavity support system of claim 4, wherein: the broad bracing wall (20) is formed by interweaving a plurality of deformation strips (24), and the deformation strips (24) of the deformation part (25) are bent inwards;

after interweaving, hollow parts (23) are formed among a plurality of adjacent deformation strips (24).

6. The intramedullary cavity support system of claim 5, wherein: the broad bracing wall (20) is a memory metal plate, and the memory metal plate is provided with a plurality of hollow parts (23).

7. The intramedullary cavity support system of claim 5, wherein: the deformation portion (25) is recessed inward.

8. The intramedullary cavity support system of claim 2, wherein: the inner coating (300) comprises an inner coating port portion (31), the inner coating port portion (31) being located in the stretch-widening end portion (21); the inner covering film (300) is provided with a feed inlet for conveying bone cement or bone grafting materials.

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