CN212395137U

CN212395137U - Humerus prosthesis

Info

Publication number: CN212395137U
Application number: CN202021173726.2U
Authority: CN
Inventors: 马骏
Original assignee: Beijing AK Medical Co Ltd
Current assignee: Beijing AK Medical Co Ltd
Priority date: 2020-06-22
Filing date: 2020-06-22
Publication date: 2021-01-26
Anticipated expiration: 2030-06-22

Abstract

The utility model provides a humerus false body, humerus false body include major structure and tubular structure, and tubular structure and major structure's end connection, tubular structure are made by shape memory alloy, and tubular structure has expansion state and a natural state, and tubular structure radial dimension under the expansion state is greater than its radial dimension under a natural state, and tubular structure is used for the cover to establish the end of remaining at the humerus. Adopt this scheme, the tubular structure cover is established at the residual end of humerus when implanting the humerus prosthesis, adopts the mode of cup jointing to realize connecting between them like this, compares with the current medullary cavity with partial insertion residual end of humerus main part, connects more stably, and the prosthesis still can reliably be connected after long-term the use. Further, the tubular structure is made of a shape memory alloy and can be placed in an expanded state prior to connection, which facilitates the fitting of the tubular structure over the residual end and then the return of the tubular structure to the first natural state, thereby facilitating a secure connection with the residual end.

Description

Humerus prosthesis

Technical Field

The utility model relates to the technical field of medical equipment, particularly, relate to a humerus false body.

Background

The humeral shaft is one of common diseased parts of primary malignant tumors of bones and soft tissues and is also a good diseased part of metastatic cancers, and accounts for 5% -8% of bone metastatic cancers. Proximal humeral tumors account for the vast majority of humeral tumors, with relatively less incidence at the humeral shaft, but with a far greater invasion range than proximal humerus. Patients often have severe pain, shoulder, elbow joint dysfunction, and poor quality of life. Limb amputation has been a very significant advance in the surgical treatment of malignant tumors in this area over the last few decades. For the operation of limb protection treatment, obtaining a tumor-free boundary is a prerequisite and is also an important factor for avoiding local recurrence. The postoperative function is a problem which needs to be considered by surgeons emphatically, and limb protection surgery not only comprises tumor resection, but also needs to consider reconstruction of bone defects after tumor resection.

In recent years, artificial segmental tumor stem prostheses, namely humerus prostheses, are applied and developed in limb preservation reconstruction after wide resection of humeral stem tumors. The existing connection mode of the humerus prosthesis and the residual humerus end is that a part of the humerus prosthesis is inserted into a medullary cavity of a diaphysis, the widths of different positions in the medullary cavity are changed, and the humerus prosthesis is easy to loosen after being used for a period of time.

SUMMERY OF THE UTILITY MODEL

The utility model provides a humerus prosthesis to improve the reliability of being connected of humerus prosthesis and the residual end of the humerus.

In order to achieve the above object, the present invention provides a humerus prosthesis comprising: a body structure; a tubular structure connected to an end of the main structure, the tubular structure being made of a shape memory alloy, the tubular structure having an expanded state and a first natural state, the tubular structure having a radial dimension in the expanded state that is greater than a radial dimension in the first natural state.

Further, the tubular structure includes the entity lateral wall and the netted lateral wall that set up along its circumference, wherein, the entity lateral wall is solid construction, netted lateral wall has a plurality of holes, the entity lateral wall with netted lateral wall all with major structure is connected.

Furthermore, the solid side walls and the net-shaped side walls are multiple, and the solid side walls and the net-shaped side walls are alternately arranged and connected along the circumferential direction of the cylindrical structure.

Further, the solid side wall is provided with a mounting hole for penetrating a fastener.

Further, the body structure is made of a shape memory alloy, the body structure having a contracted state and a second natural state, the length of the body structure in the contracted state being less than the length of the body structure in the second natural state.

Further, the major structure includes the spliced pole that a plurality of intervals set up, the tip of spliced pole with tubular structure is connected, the spliced pole can be set up with the bending and straightening, the major structure is in under the crooked condition of spliced pole the contraction state, the major structure is in under the condition that the spliced pole straightens the second natural state.

Further, the main body structure further comprises: and each connecting column is connected with the reinforcing structure.

Further, the reinforcing structure is a plurality of, a plurality of reinforcing structure interval sets up, wherein, the spliced pole is located adjacent two the part flexible and setting with straightening between the reinforcing structure.

Further, the reinforcing structure is plate-shaped, and the reinforcing structure is provided with a plurality of through holes.

Further, the number of the cylindrical structures is two, and the two cylindrical structures are respectively arranged at two ends of the main body structure.

Further, the humerus prosthesis is an integrally formed structure made by a 3D printing process.

Use the technical scheme of the utility model, a humerus false body is provided, humerus false body includes major structure and tubular structure, tubular structure and major structure's end connection, and tubular structure is made by shape memory alloy, and tubular structure has expansion state and a natural state, and tubular structure radial dimension under the expansion state is greater than its radial dimension under a natural state, and tubular structure is used for the cover to establish the end of remaining at the humerus. Adopt this scheme, the tubular structure cover is established at the residual end of humerus when implanting the humerus prosthesis, adopts the mode of cup jointing to realize connecting between them like this, compares with the current medullary cavity with partial insertion residual end of humerus main part, connects more stably, and the prosthesis still can reliably be connected after long-term the use. Furthermore, the tubular structure is made of a shape memory alloy and can be set to an expanded state before connection, so that the tubular structure can be conveniently sleeved on the residual end, and then the tubular structure is restored to the first natural state through conditions such as temperature change, and the radial dimension of the tubular structure is shrunk so as to be reliably connected with the residual end. Therefore, the proposal not only improves the connection reliability of the humerus prosthesis and the residual humerus end, but also facilitates the connection operation of the humerus prosthesis and the residual humerus end.

Drawings

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

fig. 1 shows a schematic structural view of a humeral prosthesis provided by an embodiment of the present invention;

fig. 2 shows another schematic view of the humeral prosthesis of fig. 1;

fig. 3 shows a front view of the humeral prosthesis of fig. 1;

fig. 4 shows a front view of the humeral prosthesis of fig. 2;

fig. 5 shows a schematic view of a reinforcing structure in the humeral prosthesis of fig. 1.

Wherein the figures include the following reference numerals:

10. a body structure; 11. connecting columns; 12. a reinforcing structure; 13. a through hole; 20. a tubular structure; 21. a solid sidewall; 22. a reticulated sidewall; 23. and (7) assembling holes.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in the drawings, embodiments of the present invention provide a humeral prosthesis comprising: a body structure 10; a tubular structure 20, the tubular structure 20 being connected to an end of the main structure 10, the tubular structure 20 being made of a shape memory alloy, the tubular structure 20 having an expanded state and a first natural state, the tubular structure 20 having a radial dimension in the expanded state that is greater than a radial dimension in the first natural state. Wherein, the cylindrical structure 20 is used for being sleeved on the residual end of the humerus. With the barrel 20 in the first natural state, the barrel 20 matches the shape of the outer peripheral surface of the femoral stump.

By adopting the scheme, the cylindrical structure 20 is sleeved at the residual end of the humerus when the humerus prosthesis is implanted, so that the connection between the humerus prosthesis and the residual end is realized by adopting a sleeving connection mode, compared with the existing medullary cavity which inserts a part of the humerus main body into the residual end, the connection is more stable, and the prosthesis can still be reliably connected after being used for a long time. Further, the tubular structure 20 is made of a shape memory alloy, and the tubular structure 20 can be set to an expanded state before connection, which facilitates fitting the tubular structure 20 over the remaining end, and then the tubular structure 20 is restored to the first natural state by a temperature change or the like, and the radial dimension of the tubular structure 20 is contracted to thereby be reliably connected to the remaining end. Therefore, the proposal not only improves the connection reliability of the humerus prosthesis and the residual humerus end, but also facilitates the connection operation of the humerus prosthesis and the residual humerus end.

In the present embodiment, the cylindrical structure 20 includes a solid sidewall 21 and a net-shaped sidewall 22 disposed along the circumference thereof, wherein the solid sidewall 21 is a solid structure, the net-shaped sidewall 22 has a plurality of pores, and both the solid sidewall 21 and the net-shaped sidewall 22 are connected to the main body structure 10. The net-shaped side wall 22 can realize good fusion with the bone and muscle tissues of the human body, and the reliability is improved. The strength of the tubular structure 20 is enhanced by the solid side walls 21.

In the present embodiment, each of the solid side walls 21 and the net-shaped side walls 22 is plural, and the plural solid side walls 21 and the plural net-shaped side walls 22 are alternately arranged and connected along the circumferential direction of the cylindrical structure 20. By adopting the arrangement, the structural strength can be enhanced while the fusion effect is improved.

In this embodiment, the solid side wall 21 has a mounting hole 23, and the mounting hole 23 is used for inserting a fastener. After the tubular structure 20 is sleeved on the residual end, the tubular structure 20 and the residual end can be further connected through a fastener, and the reliability and the stability of connection are improved.

In the present embodiment, the main body structure 10 is made of a shape memory alloy, and the main body structure 10 has a contracted state and a second natural state, and the length of the main body structure 10 in the contracted state is smaller than the length of the main body structure in the second natural state. Therefore, before the humerus prosthesis is implanted, the main body structure 10 is adjusted to be in a contraction state through cooling and other conditions to reduce the length of the main body structure 10, and then the humerus prosthesis is implanted, so that the radial nerve is prevented from being pulled in the prosthesis implantation process to cause radial nerve damage, and forearm movement disorder is avoided. After implantation, the small body structure 10 returns to the second natural state under conditions such as elevated temperature.

Alternatively, the main body structure 10 is in a contracted state with the tubular structure 20 in the expanded state, and the main body structure 10 is in a second natural state with the tubular structure 20 in the first natural state. This may further facilitate implantation of the tubular structure 20.

In this embodiment, the main body structure 10 includes a plurality of connecting columns 11 arranged at intervals, the end of the connecting column 11 is connected with the tubular structure 20, the connecting column 11 is bendable and straightly arranged, the main body structure 10 is in a contracted state under the condition that the connecting column 11 is bent, and the main body structure 10 is in a second natural state under the condition that the connecting column 11 is straight. By adopting the scheme, the main body structure 10 can be stretched by controlling the bending and straightening of the connecting column 11.

In the present embodiment, the main body structure 10 further includes: a reinforcing structure 12, each connecting column 11 being connected to the reinforcing structure 12. By providing the reinforcing structure 12, the strength of the main body structure 10 can be improved.

In this embodiment, the reinforcing structure 12 is a plurality of reinforcing structures 12, and the plurality of reinforcing structures 12 are disposed at intervals, wherein the portion of the connecting column 11 located between two adjacent reinforcing structures 12 is disposed in a bendable manner and in a straight manner. This achieves a change in length of the body structure 10 by bending and unbending the connecting column 11 between the two reinforcing structures 12.

Optionally, at two ends of the connecting columns 11, a reinforcing structure 12 is provided, and the connecting columns 11 are connected with the cylindrical structure 20 through the reinforcing structures 12. This facilitates the connection of the connection column 11 and the cylindrical structure 20, and can improve the structural strength.

Further, the reinforcing structure 12 has a plate shape, and the reinforcing structure 12 has a plurality of through holes 13. By providing a plurality of through holes 13, the effect of reducing the use of materials can be achieved.

In the present embodiment, there are two cylindrical structures 20, and the two cylindrical structures 20 are respectively disposed at both ends of the main structure 10. Two cylindrical structures 20 are connected to the two remaining ends of the humerus, respectively, to achieve prosthesis implantation. Optionally, the height of the cylindrical structure 20 is 5-100 mm, the pore diameter of the pores in the net-shaped side wall 22 is 100-1000 μm, and the volume ratio of the porosity is 10-80%.

In this embodiment, the humeral prosthesis is an integrally molded structure made by a 3D printing process. This facilitates the manufacture of irregularly shaped humeral prostheses which are strong.

The utility model discloses a humerus false body is made through 3D printing technology by shape memory alloy, and the upper and lower end is tubular structure, has netted lateral wall and entity lateral wall. The method is characterized in that the printing is performed before the operation according to the structure of the residual humerus after the tumor of a patient is cut, the cylindrical structure has a shape matched with the anatomical structure of the humerus, the cylindrical structure is softened under the low-temperature condition after the printing is completed, and external force is applied to deform the cylindrical structure into a regular shape which is easy to implant in the operation. After implantation, the temperature rises due to factors such as body temperature, and the shape matched with the humerus can be restored after printing. The middle section of the humerus prosthesis is of a main structure, the vertical direction of the main structure is provided with a plurality of connecting columns, the middle of the main structure is provided with a plurality of layers of reinforcing structures in the horizontal direction, the connecting columns are softened under the low-temperature condition after printing is finished, and external force is applied to deform the connecting columns into a bending state, so that the length of the prosthesis is shortened. After the implant is implanted, the temperature rises due to factors such as body temperature and the like, the upper limb of the patient can be stretched to the length just printed, and the length of the upper limb of the patient is recovered.

The tubular structure in this scheme can overlap on remaining upper and lower section upper arm bone, with the fine matching of upper arm bone anatomical structure, can realize stably fixedly, initial stability is good. The cylindrical structure realizes the extramedullary fixation of the prosthesis, and effectively solves the problem that the long handles are required to be arranged at the two ends of the traditional segmental prosthesis to be respectively inserted into the medullary cavity at the far end and the near end, while the medullary cavity at the far end of the humeral shaft is gradually widened, so that the prosthesis is easy to loosen.

The main structure of the humerus prosthesis is a short structure before implantation, so that the humerus prosthesis is easy to implant in an operation, and the radial nerve is prevented from being pulled in the prosthesis implantation process to cause radial nerve damage, thereby causing forearm dyskinesia. After the implant is implanted, the temperature rises due to factors such as body temperature and the like, the upper limb of the patient can be stretched to the length just printed, and the length of the upper limb of the patient is recovered. The humerus prosthesis is integrally formed through 3D printing, and the problem that all sections of the segmental prosthesis are loosened possibly is solved.

To facilitate understanding of the present solution, a brief description of shape memory alloys follows.

The shape memory alloy is a material composed of two or more metal elements having a shape memory effect by thermoelastic and martensitic transformation and inversion thereof. Shape memory alloys are the best shape memory materials among current shape memory materials. To date, over 50 alloys with shape memory effects have been found. There are many successful paradigms of application in the aerospace field. For example, a large antenna on a satellite may be made of memory alloy.

Shape memory alloys have found widespread use in clinical medicine, such as artificial bones, injured bone fixation pressurizers, orthodontic appliances, various endoluminal stents, embolization devices, heart prostheses, thrombus filters, interventional guidewires and surgical sutures, etc., and memory alloys are playing an irreplaceable role in modern medicine. Memory alloys are also relevant to our daily lives.

The shape memory alloy has shape memory effect, and in the case of a spring made of memory alloy, when the spring is put in hot water, the length of the spring is immediately extended, and when the spring is put in cold water, the spring is immediately restored. Another important property of shape memory alloys is pseudo-elasticity, which is expressed by the fact that under an external force, shape memory alloys have a much larger deformation recovery capacity than ordinary metals, i.e. the large strains generated during loading are recovered with unloading. This property has gained widespread use in medicine and in building cushioning as well as in everyday life. Such as artificial bones, injured bone fixation pressers, orthodontic appliances, etc. The spectacle frame made of shape memory alloy can bear much larger deformation than common material without damage.

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. A humeral prosthesis, characterized in that it comprises:

a body structure (10);

a tubular structure (20), the tubular structure (20) being connected to an end of the main structure (10), the tubular structure (20) being made of a shape memory alloy, the tubular structure (20) having an expanded state and a first natural state, the tubular structure (20) having a radial dimension in the expanded state that is greater than a radial dimension in the first natural state.

2. The humeral prosthesis of claim 1, characterized in that the cylindrical structure (20) includes a solid side wall (21) and a mesh side wall (22) disposed along a circumference thereof, wherein the solid side wall (21) is a solid structure, the mesh side wall (22) has a plurality of pores, and both the solid side wall (21) and the mesh side wall (22) are connected with the main body structure (10).

3. The humeral prosthesis according to claim 2, characterized in that the solid side walls (21) and the reticular side walls (22) are each plural, and the plural solid side walls (21) and the plural reticular side walls (22) are alternately arranged and connected in the circumferential direction of the cylindrical structure (20).

4. Humeral prosthesis according to claim 2, characterized in that the solid side wall (21) has assembly holes (23) thereon, the assembly holes (23) being used for the penetration of fasteners.

5. Humeral prosthesis according to claim 2, characterized in that the main structure (10) is made of a shape memory alloy, the main structure (10) having a contracted state and a second natural state, the length of the main structure (10) in the contracted state being smaller than its length in the second natural state.

6. The humeral prosthesis according to claim 5, characterized in that the main body structure (10) includes a plurality of connecting columns (11) arranged at intervals, ends of the connecting columns (11) are connected with the cylindrical structure (20), the connecting columns (11) are arranged bendable and unbent, the main body structure (10) is in the contracted state when the connecting columns (11) are bent, and the main body structure (10) is in the second natural state when the connecting columns (11) are unbent.

7. The humeral prosthesis of claim 6, characterized in that the body structure (10) further includes:

a reinforcing structure (12), each connecting column (11) being connected to the reinforcing structure (12).

8. The humeral prosthesis according to claim 7, characterized in that the reinforcing structures (12) are plural, and the plural reinforcing structures (12) are arranged at intervals, wherein the portion of the connecting column (11) between the adjacent two reinforcing structures (12) is arranged to be bendable and unbent.

9. The humeral prosthesis according to claim 7, characterized in that the reinforcing structure (12) is plate-shaped, and the reinforcing structure (12) has a plurality of through holes (13) therein.

10. The humeral prosthesis according to claim 1, characterized in that the number of the cylindrical structures (20) is two, and the two cylindrical structures (20) are respectively provided at both ends of the main body structure (10).

11. The humeral prosthesis of claim 1, which is a one-piece structure made by a 3D printing process.