CN218279887U

CN218279887U - Bionic type extendable prosthesis

Info

Publication number: CN218279887U
Application number: CN202221632559.2U
Authority: CN
Inventors: 王恒山; 岳术俊; 许奎雪; 荀世界; 魏章利; 刘晓薇
Original assignee: Xingtai Langtai Benyuan Medical Instrument Co ltd; Beijing Chunlizhengda Medical Instruments Co Ltd
Current assignee: Xingtai Langtai Benyuan Medical Instrument Co ltd; Beijing Chunlizhengda Medical Instruments Co Ltd
Priority date: 2022-06-28
Filing date: 2022-06-28
Publication date: 2023-01-13
Anticipated expiration: 2032-06-28

Abstract

The utility model provides a bionic type extendable prosthesis, which comprises an extension supporting piece, a prosthesis body and an extension push rod; the extension supporting piece comprises an intramedullary pin and an adjusting rod which are fixedly connected together, and a threaded cavity is formed in the center of one end of the adjusting rod; the extension push rod comprises a push block and a push rod which are fixedly connected together, and the push block is screwed in the threaded cavity through threads; the prosthesis body comprises a prosthesis proximal end and a prosthesis handle body which are fixedly connected together, the prosthesis handle body is movably inserted in the threaded cavity, a through hole-shaped propelling cavity is formed in the axis of the prosthesis handle body, one end of the propelling cavity is penetrated out of the surface of the prosthesis proximal end, and the propelling rod is rotatably inserted in the propelling cavity; two anti-rotation strips are fixedly arranged on the outer wall of the prosthesis handle body; two anti-spiral strip all set up along the axial of false body handle body to correspond on the inner wall in screw cavity and seted up two and supply anti-spiral strip slip inserted anti-spiral groove. The utility model discloses an extension length is easy just to have anti function of revolving of accuse.

Description

Bionic type extendable prosthesis

Technical Field

The utility model relates to the technical field of medical equipment, concretely relates to bionical type can prolong false body.

Background

The extendable prosthesis can better solve the problem that the limbs of the child are unequal after limb protection, and the currently widely adopted extendable prosthesis needs to open an incision with a certain length through an operation to expose an extension screw each time the extension is performed, and then the extension of the prosthesis is performed by using a mechanical driving device. The invasive and extendable prosthesis has limited extension length each time, and if the extension needs to be performed for multiple times, multiple operations need to be performed, which not only causes great pain and economic burden to patients, but also increases the probability of postoperative complications.

The invention patent (CN 112674912A) discloses a long bone lengthening prosthesis. The sleeve is provided with a first sleeve with a first accommodating cavity and a second sleeve with a second accommodating cavity, and the second sleeve is positioned above the first sleeve and is at least partially arranged in the first sleeve, so that the first accommodating cavity and the second accommodating cavity are communicated to form a closed cavity; meanwhile, the second sleeve and the first sleeve are relatively movably arranged; the elastic piece is of a spiral structure, and the spiral structure is arranged in a closed cavity formed by the first accommodating cavity and the second accommodating cavity; the elastic piece is made of a one-way memory alloy material, and the one-way memory alloy material can stretch after being heated by hot fluid; the spiral structure is provided with a hollow cavity, and the first sleeve is provided with an injection port communicated with the hollow cavity; when the long bone lengthening prosthesis needs to be lengthened, fluid with preset temperature can be injected into the hollow cavity of the spiral structure through the injection port, so that the elastic part is lengthened; in the extension process of the elastic part, the two ends of the elastic part push against the first sleeve and the second sleeve, so that the first sleeve and the second sleeve are far away from each other, the long bone extension prosthesis can be extended, and the effect of limb extension is achieved. The long bone lengthening prosthesis with the structure needs to inject fluid with preset temperature into the hollow cavity of the spiral structure to realize lengthening of the long bone lengthening prosthesis, has small wound and simple operation, and effectively solves the problems that the lengthening prosthesis needs a large incision, has more operation times and is easy to cause complications in the related technology.

However, this patent is primarily directed to humeral or femoral prostheses for a particular patient, which, although solving certain technical problems and having a series of advantages, nevertheless have disadvantages: the prosthesis is only a conceptual prosthesis, has poor practical effect, is difficult to control after the extension length of the prosthesis is prolonged, and has poor effect after operation; the prosthesis has no anti-rotation function, and the prosthesis is easy to rotate in a human body, so that a patient suffers from secondary or multiple pains, and the burden of the patient is increased.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a bionic type that extension length is easy to be controlled and has anti-spin function can prolong false body to the not enough of prior art.

In order to solve the above technical problem, the present invention includes:

a bionic type extendable prosthesis comprises an extension supporting piece, a prosthesis body and an extension push rod; the extension supporting piece comprises an intramedullary pin and an adjusting rod which are fixedly connected together, and a threaded cavity is formed in the center of one end of the adjusting rod; the extension push rod comprises a push block and a push rod which are fixedly connected together, and the push block is screwed in the threaded cavity through threads; the prosthesis body comprises a prosthesis proximal end and a prosthesis handle body which are fixedly connected together, the prosthesis handle body is movably inserted in the threaded cavity, a through-hole-shaped propelling cavity is formed in the axis of the prosthesis handle body, one end of the propelling cavity is penetrated out of the surface of the prosthesis proximal end, and the propelling rod is rotatably inserted in the propelling cavity; two anti-rotation strips are fixedly arranged on the outer wall of the prosthesis handle body; two anti-spiral strip all set up along the axial of false body handle body to the corresponding anti-spiral groove of having seted up two confessions anti-spiral strip slip insertedly of screwing in on the inner wall in screw thread chamber.

Further, the thread cavity is of a blind hole type structure.

Furthermore, an external thread matched with the internal thread of the threaded cavity is formed in the outer wall of the propelling block.

Furthermore, the outer diameter of the prosthesis handle body is smaller than the inner diameter of the threaded cavity, the opening of the threaded cavity is provided with a slip-off prevention ring, and the inner diameter of the slip-off prevention ring is equal to or slightly smaller than the outer diameter of the prosthesis handle body.

Further, the two anti-rotation strips are symmetrically distributed about the axis of the prosthesis stem.

Further, the length of the propelling rod is slightly smaller than the depth of the propelling cavity.

Furthermore, the proximal end of the prosthesis is provided with an impedance hole along the radial direction of the prosthesis handle body, and the pushing rod is provided with an annular impedance groove at a position corresponding to the impedance hole; and an impedance pin is inserted in the impedance hole.

Furthermore, a hexagonal counter bore is formed in the head of the push rod.

Further, the proximal end of the prosthesis is a proximal femur or a proximal humerus.

The utility model has the advantages that:

the utility model can adjust the length of the prosthesis according to the condition of the patient by rotating the extension push rod, the extension of the prosthesis is converted into the linear movement of the prosthesis body by the rotation of the extension push rod, therefore, the extension length of the prosthesis can be calculated according to the number of turns of the extension push rod, and a good control effect is achieved; through set up anti-the groove of revolving on the outer wall of false body handle body to and set up anti-the groove of revolving on the screw thread intracavity wall corresponds, when utilizing the rotation of extension push rod to drive the false body and move to the screw thread intracavity outward, the false body can only be along the axial displacement of screw thread intracavity, has prevented effectively that the false body from taking place to rotate and causing secondary or wound many times to the patient.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the extension support of the present invention;

FIG. 3 is a top view of FIG. 2;

FIG. 4 is a schematic view of the extension rod of the present invention;

FIG. 5 is a top view of FIG. 4;

FIG. 6 is a schematic view of the prosthesis body according to the present invention;

FIG. 7 is a top view of the stem of the prosthesis of FIG. 6;

in the figure: 10. the extension support member 20, the prosthesis body 30, the extension push rod 40, the prosthesis proximal end 50, the resistance pin 11, the anti-rotation groove 12, the thread cavity 13, the adjusting rod 14, the intramedullary needle 21, the resistance hole 22, the anti-rotation strip 23, the pushing cavity 31, the counter bore 32, the resistance groove 33, the pushing rod 34 and the pushing block.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and embodiments. It should be understood by those skilled in the art that the described embodiments are merely provided to assist in understanding the present invention and should not be construed as specifically limiting the present invention.

As shown in fig. 1-7, the present invention provides a biomimetic type extendable prosthesis, comprising an extension support member 10, a prosthesis body 20, and an extension push rod 30; the extension supporting piece 10 comprises an intramedullary needle 14 and a cylindrical adjusting rod 13 which are fixedly connected together, and a blind hole type threaded cavity 12 is formed in the center of one end of the adjusting rod 13; the extension push rod 30 comprises a push block 34 and a push rod 33 which are fixedly connected together, the outer wall of the push block 34 is provided with an external thread matched with the internal thread of the threaded cavity 12, and the push block 34 is screwed in the threaded cavity 12 through the thread; the prosthesis body 20 comprises a proximal prosthesis end 40 and a stem which are fixedly connected together, and the stem is movably inserted in the threaded cavity 12, and the proximal prosthesis end 40 is a proximal femur or a proximal humerus, which can be designed according to the condition of a patient. The axial center of the prosthesis handle body is provided with a through hole-shaped propelling cavity 23, one end of the propelling cavity 23 is penetrated out of the surface of the proximal end 40 of the prosthesis, a propelling rod 33 is rotatably inserted in the propelling cavity 23, and the diameter of the propelling rod 33 is equal to or slightly smaller than the aperture of the propelling cavity 23; two anti-rotation strips 22 are fixedly arranged on the outer wall of the prosthesis handle body; two anti-strip 22 of revolving all set up along the axial of false body handle body, and about the axle center symmetric distribution of false body handle body, correspond on the inner wall of screw cavity 12 offer two confession anti-strip 22 slip inserted anti-groove 11 of revolving, two anti-strip 22 of revolving slide respectively insert in two anti-groove 11 of revolving.

The whole prosthesis body 20 of the utility model can be printed by 3D, the most matched prosthesis is designed according to the physiological radian of sclerotin of each patient, and meanwhile, the length can be adjusted according to the osteotomy distance to be suitable for different patients, thereby realizing individual customization; only a small opening is needed to be arranged above the humerus and the greater tuberosity, thereby greatly saving the operation time, relieving the pain of the patient and reducing the infection risk of the incision; the intramedullary needle 14 is inserted into the medullary cavity to play a role in stabilizing, and the stability of the prosthesis in the early and later stages is greatly improved; the length of the prosthesis can be adjusted according to the condition of the patient by rotating the extension push rod 30, the extension of the prosthesis is converted into the linear movement of the prosthesis body 20 by the rotation of the extension push rod 30, so the extension length of the prosthesis can be calculated according to the number of the rotation turns of the extension push rod 30, and a good control effect is achieved; by arranging the anti-rotation strip 22 on the outer wall of the prosthesis handle body and correspondingly arranging the anti-rotation groove 11 on the inner wall of the threaded cavity 12, when the rotation of the extension push rod 30 is utilized to drive the prosthesis body 20 to move towards the outside of the threaded cavity 12, the prosthesis body 20 can only move along the axial direction of the threaded cavity 12, thereby effectively preventing the prosthesis body 20 from rotating to cause secondary or multiple wounds to a patient.

The outer diameter of the prosthesis handle body is smaller than the inner diameter of the thread cavity 12, the opening of the thread cavity 12 is provided with a slip-proof ring, and the inner diameter of the slip-proof ring is equal to or slightly smaller than the outer diameter of the prosthesis handle body. Through set up anticreep ring at the opening part of screw thread chamber, prevent that extension push rod 30 from reducing the risk of performing the operation once more because the extension overlength leads to the condition of deviating from.

The length of the push rod 33 is slightly less than the depth of the push lumen 23. The prosthesis proximal end 40 is provided with a resistance hole 21 along the radial direction of the prosthesis handle body, and the push rod 33 is provided with a resistance groove 32 in an annular shape corresponding to the position of the resistance hole 21; the resistance hole 21 has a resistance pin 50 inserted therein. The head of the push rod 33 is provided with a hexagonal countersunk hole 31. The resistance pin 50 is pulled out, and the push rod 33 can be conveniently rotated by using a tool through the counter sunk hole 31, so that the prosthesis is extended for a certain length; after the extension is completed, the resistance pin 50 is inserted into the resistance hole 21, so that the tip of the resistance pin 50 is caught in the resistance groove 32 and the extension push rod 30 is locked, preventing the extension push rod 30 from rotating.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A biomimetic, extendable prosthesis, comprising: comprises an extension support (10), a prosthesis body (20) and an extension push rod (30); the extension supporting piece (10) comprises an intramedullary needle (14) and an adjusting rod (13) which are fixedly connected together, and a threaded cavity (12) is formed in the center of one end of the adjusting rod (13); the extension push rod (30) comprises a push block (34) and a push rod (33) which are fixedly connected together, and the push block (34) is screwed in the threaded cavity (12); the prosthesis body (20) comprises a prosthesis proximal end (40) and a prosthesis handle body which are fixedly connected together, the prosthesis handle body is movably inserted into the threaded cavity (12), the axis of the prosthesis handle body is provided with a through hole-shaped propelling cavity (23), one end of the propelling cavity (23) is penetrated out of the surface of the prosthesis proximal end (40), and the propelling rod (33) is rotatably inserted into the propelling cavity (23); two anti-rotation strips (22) are fixedly arranged on the outer wall of the prosthesis handle body; two anti-rotation strips (22) are arranged along the axial direction of the prosthesis handle body, and two anti-rotation grooves (11) for the anti-rotation strips (22) to be inserted in a sliding mode are correspondingly formed in the inner wall of the threaded cavity (12).

2. The biomimetic, extendable prosthesis of claim 1, wherein: the thread cavity (12) is of a blind hole type structure.

3. The biomimetic, extendable prosthesis of claim 1, wherein: and the outer wall of the propelling block (34) is provided with an external thread matched with the internal thread of the threaded cavity (12).

4. The biomimetic, extendable prosthesis of claim 1, wherein: the outer diameter of the prosthesis handle body is smaller than the inner diameter of the threaded cavity (12), an anti-falling ring is arranged on an opening of the threaded cavity (12), and the inner diameter of the anti-falling ring is equal to or slightly smaller than the outer diameter of the prosthesis handle body.

5. The biomimetic, extendable prosthesis of claim 1, wherein: the two anti-rotation strips (22) are symmetrically distributed about the axis of the prosthesis stem.

6. The biomimetic, extendable prosthesis of claim 1, wherein: the length of the push rod (33) is slightly smaller than the depth of the push cavity (23).

7. The biomimetic, extendable prosthesis of claim 1, wherein: the prosthesis proximal end (40) is provided with an impedance hole (21) along the radial direction of the prosthesis handle body, and the push rod (33) is provided with an annular impedance groove (32) at a position corresponding to the impedance hole (21); an impedance pin (50) is inserted into the impedance hole (21).

8. The biomimetic, extendable prosthesis of claim 1, wherein: the head of the push rod (33) is provided with a hexagonal counter bore (31).

9. The biomimetic, extendable prosthesis of claim 1, wherein: the proximal prosthesis end (40) is a proximal femur or proximal humerus.