CN111643233A

CN111643233A - Intramedullary canal and prosthesis with same

Info

Publication number: CN111643233A
Application number: CN202010625114.0A
Authority: CN
Inventors: 马小林
Original assignee: Beijing AK Medical Co Ltd
Current assignee: Beijing AK Medical Co Ltd
Priority date: 2020-07-01
Filing date: 2020-07-01
Publication date: 2020-09-11

Abstract

The invention provides a medullary cavity inner sleeve and a prosthesis with the same, wherein the medullary cavity inner sleeve comprises: the tube body is a net-shaped tube which is woven by material wires, the material wires are made of memory materials, and the prosthesis can be accommodated in an inner hole of the tube body. By applying the technical scheme of the invention, the problem of poor stability of prosthesis fixation in the prior art can be effectively solved.

Description

Intramedullary canal and prosthesis with same

Technical Field

The invention relates to the technical field of prosthesis installation, in particular to an intramedullary canal and a prosthesis with the same.

Background

Currently, artificial joint replacement is widely used in clinical treatment and is one of the standard operations for treating joint diseases. The artificial joint replacement has the advantages of relieving pain, improving joint function, and recovering joint stability and limb function. However, complications such as loosening and dislocation may also occur after surgery due to problems with the materials and replacement techniques of the joint prosthesis itself. Revision is required when the above complications occur.

In the prior art, when the prosthesis after replacement is renovated, the large-scale bone defect caused by taking out the prosthesis and bone cement brings inconvenience to the re-implantation of the prosthesis due to the problems of bone dissolution, stress shielding and the like. For example, when the femoral revision is performed, the prosthesis and the bone cement need to be removed, and in order to remove the prosthesis and the bone cement, auxiliary operations such as trochanter extension osteotomy and femoral fenestration are required, which causes a wide range of bone defects, makes the prosthesis difficult to fix, and deteriorates the stability after fixation.

Disclosure of Invention

The invention mainly aims to provide an intramedullary canal and a prosthesis with the same, so as to solve the problem of poor stability of prosthesis fixation in the prior art.

To achieve the above object, according to one aspect of the present invention, there is provided an intramedullary canal including: the tube body is a net-shaped tube which is woven by material wires, the material wires are made of memory materials, and the prosthesis can be accommodated in an inner hole of the tube body.

Furthermore, the material silk is many, and is mutually not perpendicular between every material silk on the cross section of body.

Further, the intramedullary canal includes: the outer sleeve is woven by material wires and wraps the surface of the pipe body, and an inner hole of the outer sleeve forms a containing hole for containing the prosthesis.

Furthermore, the surface of the pipe body is provided with a plurality of free ends of the material wires, and the free ends of the material wires are connected with the outer sleeve.

Furthermore, a first notch penetrating through the end faces of the two ends of the pipe body is formed in the side wall of the pipe body, a second notch corresponding to the first notch is formed in the outer sleeve, and the second notch penetrates through the end faces of the two ends of the outer sleeve.

Further, the diameter of the inner bore of the outer sleeve is between 3mm and 35mm, and/or the diameter of the outer sidewall of the outer sleeve is between 5mm and 40mm, and/or the length of the outer sleeve is between 20mm and 500 mm.

Further, the taper of the outer sidewall of the jacket is between 1 ° and 15 °.

Further, the memory material is a nickel titanium material or a cobalt chromium material.

Further, the intramedullary canal is formed by printing a 3D printer.

According to another aspect of the present invention, there is provided a prosthesis comprising: a prosthesis body; the medullary cavity inner sleeve is the medullary cavity inner sleeve, and the proximal end of the prosthesis body is inserted into the inner hole of the tube body of the medullary cavity inner sleeve.

By applying the technical scheme of the invention, the tube body is made of the memory material, has a contraction state and a support state, and has a small volume when in the contraction state, so that the tube body can be conveniently placed in a medullary cavity. When the pipe body is in a supporting state, the volume of the pipe body is increased. When in renovation, the tube body in the contraction state is firstly placed in the medullary cavity, and then the state of the tube body is changed into the supporting state. The pipe body in the supporting state can be abutted against the inner wall of the medullary cavity and fixed in the medullary cavity, and then the prosthesis is fixed in the pipe body to complete the fixation of the prosthesis. The structure can strengthen the strength of the medullary cavity, is convenient for fixing the prosthesis and can also improve the stability of the implanted prosthesis.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

figure 1 shows a schematic longitudinal sectional view of an embodiment of an intramedullary canal according to the invention after loading into the intramedullary canal;

FIG. 2 shows a side view of the inner sleeve of the intramedullary canal of FIG. 1;

FIG. 3 shows a schematic cross-sectional view of the inner cannula of the intramedullary canal of FIG. 1; and

FIG. 4 shows a schematic cross-sectional view of the tubular body of the inner cannula of the intramedullary canal of FIG. 3; and

fig. 5 shows a schematic view of the inner casing of the medullary cavity of fig. 1 after stacking.

Wherein the figures include the following reference numerals:

1. material filaments; 2. a free end; 3. a medullary cavity; 10. a pipe body; 11. a first notch; 20. a jacket; 21. an accommodation hole; 22. a second notch; 23. an inner sleeve; 24. an outer sleeve; 25. end sleeves; 40. an intramedullary canal.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in fig. 1 to 4, the intramedullary canal of the present embodiment includes: the prosthesis comprises a tube body 10, wherein the tube body 10 is a net-shaped cylinder formed by weaving material wires 1, the material wires 1 are made of memory materials, and a prosthesis can be accommodated in an inner hole of the tube body 10.

By applying the technical scheme of the embodiment, the tube body 10 is made of the memory material, the tube body 10 has a contraction state and a support state, and when the tube body 10 is in the contraction state, the volume of the tube body is small, so that the tube body can be conveniently placed in the medullary cavity 3. When the tubular body 10 is in the supporting state, its volume increases. During renovation, the tube body 10 in the contraction state is firstly placed in the medullary cavity 3, and then the state of the tube body 10 is changed into the supporting state. The tube body 10 in the supporting state can be abutted against the inner wall of the medullary cavity 3 and fixed inside the medullary cavity 3, and then the prosthesis is fixed in the tube body 10, so that the prosthesis fixation is completed. The structure can strengthen the strength of the medullary cavity 3, is convenient for fixing the prosthesis and can also improve the stability of the implanted prosthesis.

It should be noted that the intramedullary canal needs to be soaked in ice saline in advance before implantation to be in a contracted state, and then placed in the intramedullary canal 3. After a few minutes, the intramedullary canal built-in sleeve can be expanded to a supporting state and is tightly attached to the inner side of the intramedullary canal 3, and then the prosthesis is implanted into the intramedullary canal to complete the renovation.

As shown in fig. 2 to 4, in the present embodiment, the material wires 1 are plural, and each material wire 1 is not perpendicular to each other on the cross section of the pipe body 10. In the above structure, if each of the material wires 1 in the cross section of the tubular body 10 is perpendicular to each other, the tubular body 10 constituted by it has a poor contractile ability in the radial direction, making it difficult to implant the tubular body 10 inside the medullary cavity 3. If the individual wires 1 are not perpendicular to each other, the contractibility of the tubular body 10 in the radial direction can be improved, thereby facilitating the implantation of the tubular body 10.

It should be noted that, as shown in fig. 4, the tubular body 10 has a plurality of cross sections, and each of the material wires 1 on each of the cross sections is not perpendicular to each other.

As shown in fig. 1 to 4, in the present embodiment, the intramedullary canal further comprises: an outer sleeve 20, the outer sleeve 20 is woven by the material wires 1 and wraps the surface of the tube body 10, and the inner hole of the outer sleeve 20 forms a containing hole 21 for containing the prosthesis. In the above structure, since the free ends 2 of the plurality of material wires 1 are provided on the surface of the tube body 10, if the free ends 2 of the material wires 1 are directly abutted against the medullary cavity 3, the material wires 1 are subjected to a large stress and are easily broken. Broken material strands 1 can form metal debris that can adversely affect the health of the patient after entering the body. The provision of the sheath 20 reduces the chance of contact between the free end 2 of the wire 1 and the medullary cavity 3, i.e. reduces the chance of wire breakage, thereby protecting the wire 1.

It should be noted that, as shown in fig. 2 to 4, in the present example, the outer sleeve 20 includes an inner sleeve 23, an outer sleeve 24 and end caps 25 at both ends of the inner sleeve 23 and the outer sleeve 24, the inner sleeve 23 can be connected to the free end of the inner side of the material wire 1, the outer sleeve 24 can be connected to the free end of the outer side of the material wire 1, and the end caps 25 can be connected to the free end of the material wire 1 at the end of the outer sleeve. The above structure enables the free ends of the material threads 1 at all positions to be connected with the outer sleeve 20, thereby further reducing the probability of breakage of the material threads 1.

As shown in fig. 2 to 4, in the present embodiment, the tube body 10 has a plurality of free ends 2 of the material wires 1 at the surface thereof, and the free ends 2 of the material wires 1 are connected to the outer sheath 20. Above-mentioned structure is through being connected free end 2 and overcoat 20, can strengthen the intensity of the 2 departments of free end of material silk 1, avoids stress concentration to avoid material silk 1 because of the too big emergence fracture of stress that receives, thereby play the effect of protection material silk 1.

As shown in fig. 2 to 4, in the present embodiment, the side wall of the pipe 10 is provided with a first notch 11 penetrating end faces of both ends of the pipe 10, the outer sleeve 20 is provided with a second notch 22 corresponding to the first notch 11, and the second notch 22 penetrates end faces of both ends of the outer sleeve 20. In the above structure, the first notch can increase the deformation of the pipe body 10, and the deformation can reach 20%. Correspondingly, set up the second breach on overcoat 20 and can play the guard action to body 10 to can prevent that material silk 1 from breaking because of the stress is too big.

In this embodiment, the diameter of the bore in the outer sleeve 20 is between 3mm and 35 mm. The intramedullary canal of the appropriate type can be selected according to the actual size of the prosthesis.

In this embodiment, the diameter of the outer sidewall of the outer sleeve 20 is between 5mm and 40 mm. The appropriate size of intramedullary canal can be selected based on the actual inner diameter of the patient's intramedullary canal 3.

In this embodiment, the length of the outer sleeve 20 is between 20mm and 500 mm. The inner casing of the pulp cavity with the proper type can be selected according to the actual length of the pulp cavity 3 of the patient. In addition, as shown in FIG. 5, when the medullary cavity 3 is long, the tubular body 10 may be provided in multiple segments to facilitate implantation of the tubular body 10.

In this embodiment, the taper of the outer sidewall of the outer sleeve 20 is between 1 ° and 15 °, as shown in fig. 1. The structure enables the medullary cavity inner sleeve to be matched with the shape of the medullary cavity 3, so that the medullary cavity inner sleeve can be connected in the medullary cavity 3 more stably.

In this embodiment, the memory material is a nickel titanium material or a cobalt chromium material. In the structure, the nickel-titanium material and the cobalt-chromium material have the advantages of wear resistance and corrosion resistance besides the function of shape memory, so that the materials can facilitate the fixation of the prosthesis, and can prolong the period of re-revision or avoid re-revision, thereby improving the stability of the prosthesis after implantation.

In this embodiment, the intramedullary canal is printed by a 3D printer. The structure can improve the processing precision of the inner sleeve of the medullary cavity.

The invention also provides a prosthesis, an embodiment of the prosthesis of the invention comprising: the artificial tooth comprises a prosthesis body and an intramedullary canal 40, wherein the intramedullary canal 40 is the intramedullary canal described above, and the proximal end of the prosthesis body is inserted into the inner hole of the tube body 10 of the intramedullary canal 40. The prosthesis with the intramedullary canal 40 has the advantages described above, since it has the advantage of being able to improve the stability of the fixation of the prosthesis. It should be noted that, in this embodiment, the prosthesis body is a femoral stem prosthesis. In other embodiments, the prosthesis body may be other prostheses such as humeral stem.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An intramedullary canal comprising: the tube body (10), the tube body (10) is a netted section of thick bamboo that is woven by material silk (1) and forms, material silk (1) is made by memory material, can hold the false body in the hole of tube body (10).

2. The intramedullary canal according to claim 1, characterized in that the material wires (1) are not perpendicular to each other in the cross section of the tubular body (10).

3. The intramedullary canal of claim 1, further comprising:

the outer sleeve (20) is woven by material wires (1) and wraps the surface of the pipe body (10), and an inner hole of the outer sleeve (20) forms a containing hole (21) for containing the prosthesis.

4. The intramedullary canal according to claim 3, characterized in that the tubular body (10) has at its surface a plurality of free ends (2) of the material wires (1), the free ends (2) of the material wires (1) being connected to the outer jacket (20).

5. The intramedullary canal according to claim 3, wherein the side wall of the tube (10) is provided with a first notch (11) extending through the end surfaces of the two ends of the tube (10), the outer sleeve (20) is provided with a second notch (22) corresponding to the first notch (11), and the second notch (22) extends through the end surfaces of the two ends of the outer sleeve (20).

6. The intramedullary canal of claim 3, wherein the diameter of the inner bore of the outer jacket (20) is between 3mm and 35mm, and/or the diameter of the outer sidewall of the outer jacket (20) is between 5mm and 40mm, and/or the length of the outer jacket (20) is between 20mm and 500 mm.

7. The intramedullary canal of claim 3 wherein the taper of the outer sidewall of the outer jacket (20) is between 1 ° and 15 °.

8. The intramedullary canal of claim 1 wherein the memory material is a nickel titanium material or a cobalt chromium material.

9. The intramedullary canal of claim 1, wherein the intramedullary canal is printed with a 3D printer.

10. A prosthesis, comprising:

a prosthesis body;

intramedullary canal (40), characterized in that the intramedullary canal (40) is according to any one of claims 1 to 9, the proximal end of the prosthesis body being inserted into the inner bore of the tubular body (10) of the intramedullary canal (40).