CN216908264U

CN216908264U - Elbow joint prosthesis

Info

Publication number: CN216908264U
Application number: CN202120157579.8U
Authority: CN
Inventors: 徐海荣; 李�远; 牛晓辉
Original assignee: Beijing Jishuitan Hospital
Current assignee: Beijing Jishuitan Hospital
Priority date: 2021-01-20
Filing date: 2021-01-20
Publication date: 2022-07-08
Anticipated expiration: 2031-01-20

Abstract

The application relates to an elbow joint prosthesis, which relates to the field of medical instruments and comprises a humerus component arranged at the lower end of a humerus, a radius component arranged at the near end of a radius and a connecting shaft component arranged between the humerus component and the radius component, wherein the humerus component and the radius component are rotatably connected through the connecting shaft component; the upper arm bone subassembly orientation the confession of U-shaped has been seted up to the one end of radius subassembly the storage tank of radius subassembly embedding runs through the confession has been seted up at radius subassembly both ends the mounting hole of connecting axle subassembly embedding, the length direction of mounting hole with the opening direction of storage tank is perpendicular, the confession has been seted up in the relative both sides wall department of storage tank on the upper arm bone subassembly the spacing groove of connecting axle subassembly embedding. This application has the needs that can be suitable for the heavier patient of ulna pathological change for the ulna amputates the effect that also can not sacrifice human elbow bending function completely when longer.

Description

Elbow joint prosthesis

Technical Field

The application relates to the field of medical instruments, in particular to an elbow joint prosthesis.

Background

When the ulna of the elbow joint is injured by bone tumor, trauma, or the like, the ulna needs to be cut off, resulting in the loss of the elbow joint function.

At present, the treatment mode after ulna resection is that when the ulna resection is less, the artificial elbow joint replacement operation can be adopted, and the elbow joint prosthesis is implanted into the elbow joint part of a human body patient, so that the function of the elbow joint is recovered. However, when the ulna is seriously affected and the ulna to be cut is long, the remaining ulna portion is small, and the elbow joint replacement operation cannot be performed. At this time, only amputation or treatment by elbow fusion can be performed, and when the treatment by elbow fusion is performed, the bending function of the elbow joint is sacrificed, so that the normal bending movement of the elbow of the human body is influenced.

SUMMERY OF THE UTILITY MODEL

In order to meet the requirements of patients with serious ulna lesions and ensure that the bending function of the elbow of a human body cannot be completely sacrificed when the ulna is cut for a long time, the application provides the elbow joint prosthesis.

The technical scheme adopted by the elbow joint prosthesis provided by the application is as follows:

an elbow joint prosthesis, comprising a humerus assembly installed at the lower end of a humerus, a radius assembly installed at the proximal end of a radius, and a connecting shaft assembly disposed between the humerus assembly and the radius assembly, the humerus assembly and the radius assembly being rotatably connected by the connecting shaft assembly; the confession of U-shaped confession has been seted up to the upper arm bone subassembly orientation the one end of radius subassembly the storage tank of radius subassembly embedding runs through the confession has been seted up at radius subassembly both ends the mounting hole of connecting shaft subassembly embedding, the length direction of mounting hole with the opening direction of storage tank is perpendicular, the confession has been seted up in the relative both sides wall department of storage tank on the upper arm bone subassembly the spacing groove of connecting shaft subassembly embedding.

Through adopting above-mentioned technical scheme, when ulna intercepting overlength, remaining ulna is short can't replace the operation time, can install the upper arm bone subassembly at the upper arm bone lower extreme, with the radius unit mount at the radius near-end, then place the radius subassembly in the storage tank, at this moment, be located the connecting axle subassembly both ends in the mounting hole and will imbed respectively in the spacing groove on the upper arm bone subassembly, thereby even be as an organic whole with radius subassembly and upper arm bone subassembly, and the upper arm bone subassembly also can rotate around the connecting axle subassembly in the storage tank, realize the bending movement of human elbow. Realized realizing through the connecting axle subassembly that the radius rotates for the humerus for get up radius and humerus through this prosthesis, make the radius replace the function of humerus, make people in ulna intercepting longer term, can realize the normal bending activity of elbow through the radius, can not sacrifice the crooked function of human elbow completely.

Optionally, the connecting shaft assembly is provided with two, two the connecting shaft assembly is followed mounting hole length direction symmetry side by side sets up, the radius subassembly inside set up with the control hole of mounting hole intercommunication, install spacing subassembly in the control hole, spacing subassembly includes sliding connection and is in butt piece in the control hole, but butt piece slidable is to promoting two between two connecting shaft assemblies the connecting shaft assembly stretches out in the mounting hole embedding spacing groove.

Through adopting above-mentioned technical scheme, through the position of slip butt piece in the control hole, just can promote two connecting axle subassemblies through the butt piece and stretch out in the mounting hole embedding spacing groove to realize the installation of radius rigid coupling and upper arm bone subassembly, and the radius subassembly can rotate around the connecting axle subassembly.

Optionally, the connecting axle subassembly includes sliding connection and is in slider in the mounting hole, be located the slider and deviate from installation pole and the rigid coupling of another connecting axle subassembly one end are in the installation pole is kept away from the stopper of slider one end, the slider orientation the confession has been seted up to the one end of installation pole the spout of installation pole embedding, the cover is equipped with first spring on the installation pole, first spring be located the stopper with between the slider.

Through adopting above-mentioned technical scheme, when the human activity, because the uneven atress in elbow both sides will drive the installation pole and slide in the spout to make two sliders extrude first spring or receive first spring force elastic action to be close to relatively, the atress is more reasonable, and the activity is more nimble.

Optionally, one end of the limiting block, which is far away from the mounting rod, is integrally hemispherical, and the limiting groove is integrally hemispherical for the limiting block to be embedded.

Through adopting above-mentioned technical scheme, when people's elbow activity, spheroidal stopper will rotate in the spacing groove, and it is more nimble to rotate.

Optionally, a control hole which is vertically communicated with the mounting hole and is used for accommodating the limiting assembly is formed in the radius assembly, the limiting assembly comprises a butting block which is slidably connected in the control hole, the butting block is located between the two sliding blocks, one ends, opposite to the two sliding blocks, of the two sliding blocks are tapered, and an elastic piece which controls the butting block to slide in the control hole is further arranged in the control hole.

Through adopting above-mentioned technical scheme, because two sliders are the taper towards the one end of butt piece, so when two slider atresss are close to relatively, will extrude the butt piece and retract in the control hole to make the position between two sliders shorten, when the power of human body bending disappears, the butt piece will extrude two sliders and make two sliders keep away from relatively and extrude first spring, thereby control the distance between two sliders.

Optionally, one end of the abutting block facing the mounting hole is tapered to abut against the two sliding blocks.

Through adopting above-mentioned technical scheme for when the butt piece promoted two sliders and kept away from relatively, perhaps when the slider promoted the butt piece indentation control hole in, the motion was all very convenient nimble.

Optionally, the elastic component includes the rigid coupling and is in fixed block, rigid coupling in the control hole are in the fixed block orientation the fixed section of thick bamboo and the rigid coupling of butt piece one end are in the butt piece orientation the slide bar of fixed block one end, the slide bar is located in the fixed section of thick bamboo and with fixed section of thick bamboo sliding fit, still the cover is equipped with the second spring on the fixed section of thick bamboo, the second spring is located the fixed block with between the butt piece.

Through adopting above-mentioned technical scheme, under the normality, will promote the butt piece and stretch out the control hole and block into between two sliders under the second spring effect to control the position between two sliders, when two slider atress, also will promote the slider and slide and extrude the second spring to the control hole, the operation is more nimble.

Optionally, a fixing bolt is connected to one side of the radius assembly through a thread, and the fixing bolt is connected to the abutting block through a thread so as to fix the position of the abutting block in the control hole.

Through adopting above-mentioned technical scheme, can fix the position of butt joint piece in the control hole through fixing bolt, be convenient for install the radius subassembly in the storage tank of humerus subassembly.

Optionally, the whole T shape that is of humerus subassembly, including be used for with first installation piece of radius subassembly complex and rigid coupling are in first installation piece is kept away from the first dead lever of radius subassembly one end, first installation piece orientation the one end rigid coupling of first dead lever has a plurality of short nails.

Through adopting above-mentioned technical scheme, just can realize the installation of humerus subassembly and humerus through installing into the humerus of human body with first dead lever, and the relative position between first installation piece and the human humerus can be fixed to a plurality of short nails, avoids the relative rotation of humerus subassembly atress emergence.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the radius assembly and the humerus assembly are rotatably connected through the connecting shaft assembly, so that when the ulna is cut too long and replacement surgery cannot be performed, the radius assembly can be rotatably connected to the humerus assembly through the connecting shaft assembly, so that the elbow of people can perform normal bending movement, and the bending function of the elbow of people cannot be completely sacrificed due to the long ulna;

2. the first spring is arranged, so that the length of the connecting shaft assembly can be adjusted, the connecting shaft assembly is suitable for bending activities of people, the stress is more reasonable, and the flexibility is better;

3. the setting of butt piece and second spring for can make during butt piece withdrawal control hole through butt piece extrusion second spring when people's crooked rotation elbow makes elbow both sides atress uneven, thereby adjust the length of connecting axle subassembly, disappear when the atress is, can be so that butt piece butt on the slider under the second spring effect, make the installation of connecting axle subassembly more stable.

Drawings

Fig. 1 is a schematic view of the overall structure of the present application.

Fig. 2 is a schematic sectional view showing the structure of the connecting shaft assembly and the stopper assembly.

Fig. 3 is a schematic cross-sectional view from another perspective to embody the fixing bolt.

Description of reference numerals: 1. a humeral component; 11. a first mounting block; 111. a containing groove; 112. a limiting groove; 12. a first fixing lever; 13. short nails; 2. a radius component; 21. a second mounting block; 211. mounting holes; 212. a control hole; 22. a second fixing bar; 3. connecting the shaft assembly; 31. a slider; 311. a chute; 32. mounting a rod; 33. a limiting block; 34. a first spring; 4. a limiting component; 41. a butting block; 42. an elastic member; 421. a fixed block; 422. a fixed cylinder; 423. a slide bar; 424. a second spring; 43. and (5) fixing the bolt.

Detailed Description

The present application is described in further detail below with reference to figures 1-3.

The embodiment of the application discloses an elbow joint prosthesis. Referring to fig. 1 and 2, the elbow prosthesis includes a humerus assembly 1 installed at the lower end of a humerus, a radius assembly 2 installed at the proximal end of a radius, and a connecting shaft assembly 3 located between the humerus assembly 1 and the radius assembly 2, wherein the radius assembly 2 and the humerus assembly 1 are rotatably connected by the connecting shaft assembly 3. When human ulna pathological change is serious, the ulna that needs to be amputated is too long, can directly install radius subassembly 2 at the radius near-end to install upper arm bone subassembly 1 at the upper arm bone lower extreme, realize the bending function of human elbow through the radius, be suitable for the needs of the heavier patient of ulna pathological change, make the ulna amputate too long, can realize normal elbow bending activity through the radius, and can not sacrifice the bending function of human elbow completely.

Referring to fig. 1 and 2, the humerus assembly 1 is generally T-shaped, and includes a first mounting block 11 and a first fixing rod 12 fixedly connected to one side of the first mounting block 11, wherein the first fixing rod 12 is used for connecting with a humerus. The radius assembly 2 has a generally T-shaped overall shape, and includes a second mounting block 21 and a second fixing rod 22 fixedly connected to one side of the second mounting block 21, the second fixing rod 22 being adapted to be connected to the radius. Wherein, a receiving groove 111 for the second mounting block 21 to be inserted is opened in a U shape at a side of the first mounting block 11 away from the first fixing rod 12, and the second mounting block 21 is mounted in the receiving groove 111 to realize the rotational connection between the radius assembly 2 and the humerus assembly 1. Meanwhile, a plurality of short nails 13 are fixedly connected to one side of the first mounting block 11 facing the first fixing rod 12, and when the first fixing rod 12 is fixed on the humerus of the human body, the short nails 13 are also matched with the humerus of the human body, so that the relative positions of the humerus component 1 and the humerus of the human body are fixed, and the relative rotation of the humerus component 1 relative to the humerus is avoided.

Mounting holes 211 are formed through two opposite sides of the second mounting block 21, when the second mounting block 21 is mounted in the receiving groove 111, the length direction of the mounting holes 211 is perpendicular to the opening direction of the receiving groove 111, and the connecting shaft assembly 3 is located in the mounting holes 211. The connecting shaft assemblies 3 are arranged in two numbers, the two connecting shaft assemblies 3 are arranged side by side along the length direction of the mounting hole 211, and the two connecting shaft assemblies 3 are symmetrically arranged along the middle positions of the lengths of the two connecting shaft assemblies. A control hole 212 vertically communicated with the mounting hole 211 is formed in the first mounting block 11, and the two connecting shaft assemblies 3 are respectively located at two sides of the control hole 212. The control hole 212 is provided with a limiting component 4 for controlling each connecting shaft component 3 to be located in the mounting hole 211 or pushing one end of each connecting shaft component 3, which is opposite to the other end and extends out of the mounting hole 211 to be exposed to the outside, and meanwhile, the first mounting block 11 is provided with a limiting groove 112 for embedding the connecting shaft component 3, and the limiting groove 112 is formed in two opposite side walls of the accommodating groove 111. When the second mounting block 21 is inserted into the receiving groove 111, the limiting component 4 can control the two ends of the connecting shaft component 3 to directly extend out of the mounting hole 211 and be inserted into the limiting groove 112, so that the second mounting block 21 can be mounted in the receiving groove 111 of the first mounting block 11 through the connecting shaft component 3, and the second mounting block 21 can rotate around the connecting shaft component 3.

Referring to fig. 2, the connecting shaft assembly 3 includes a sliding block 31 slidably connected in the mounting hole 211, a mounting rod 32 located at one end of the sliding block 31 away from another connecting shaft assembly 3, and a limiting block 33 fixedly connected to one end of the mounting rod 32 away from the sliding block 31, wherein a sliding slot 311 for embedding the mounting rod 32 is provided at one end of the sliding block 31 facing the mounting rod 32, a first spring 34 is sleeved on the mounting rod 32, and two ends of the first spring 34 abut against the limiting block 33 and the sliding block 31 respectively. Under the normal state, the first spring 34 can abut against the limit block 33 and the slide block 31 to be located at the farthest distance under the action of the elastic force, and when the limit block 33 and the slide block 31 are located at the farthest distance, the limit block 33 can be completely located in the installation hole 211, and then after the second installation block 21 is placed into the accommodating groove 111, the limit block 33 can be exposed to the outside and embedded into the limit groove 112 directly through the limit component 4, so that the second installation block 21 is fixed in the accommodating groove 111, and the second installation block 21 can rotate around the installation rod 32.

The limiting block 33 is hemispherical, so that the elbow can be bent more flexibly, and the limiting block 33 is prevented from being obstructed when moving in the limiting groove 112.

Referring to fig. 2, the stop assembly 4 comprises an abutment block 41 slidably coupled in the control hole 212, the abutment block 41 being located between the two sliders 31. Wherein, the one end of two sliders 31 towards the butt block 41 is conical, so that when the sliding butt block 41 is located between two sliders 31, the butt block 41 can butt on the conical surface of the slider 31 to push the two sliders 31 to slide towards the two ends of the mounting hole 211, thereby realizing that the push limiting block 33 extends out of the mounting hole 211 and is embedded into the limiting groove 112. Meanwhile, in order to facilitate the abutting block 41 and the slider 31 to be matched more closely, one end of the abutting block 41 facing the slider 31 is also tapered, so that the abutting block 41 is more convenient to push the slider 31.

Meanwhile, the control hole 212 is also internally provided with an elastic piece 42 for controlling the abutting block 41 to slide in the control hole 212, under the action of the elastic piece 42, the abutting block 41 can be pushed to slide out of the control hole 212, so that the sliding block 31 is pushed to slide in the mounting hole 211, when the elbow of a person is bent, because the two sides of the elbow are unevenly stressed, one end of the sliding block 31 is pushed to push the abutting block 41 to the control hole 212 to be far away from the mounting hole 211 to slide, so that the mounting rod 32 slides in the sliding groove 311 to adapt to the bending requirement of the person, the stress is more reasonable, and the movement is more flexible.

Referring to fig. 2 and 3, the elastic element 42 includes a fixed block 421 fixedly connected to an end of the control hole 212 far from the mounting hole 211, a fixed cylinder 422 fixedly connected to an end of the fixed block 421 facing the abutting block 41, a sliding rod 423 fixedly connected to an end of the abutting block 41 facing the fixed block 421, and a second spring 424 sleeved on the fixed cylinder 422, wherein the sliding rod 423 is located in the fixed cylinder 422 and slidably engaged with the fixed cylinder 422, and two ends of the second spring 424 abut against the fixed block 421 and the abutting block 41, respectively. The abutting block 41 can be pushed to move towards the mounting hole 211 by the elastic force of the second spring 424, so as to push the two sliding blocks 31 to move back in the mounting hole 211, and at this time, the sliding rod 423 also slides in the fixed cylinder 422. When the elbow of the human body is unevenly bent, the sliding block 31 can also push the abutting block 41 to press the second spring 424 and retract into the control hole 212 so as to adapt to the requirement of bending the elbow of the human body.

Meanwhile, in order to fix the position of the abutting block 41 in the control hole 212, the second mounting block 21 is conveniently mounted in the accommodating groove 111, the fixing bolt 43 is screwed on one side of the first mounting block 11, the fixing bolt 43 is screwed with the abutting block 41, and the position of the abutting block 41 in the control hole 212 is fixed by the fixing bolt 43, so that the second mounting block 21 is conveniently mounted in the accommodating groove 111.

The implementation principle of the elbow joint prosthesis in the embodiment of the application is as follows: during installation, the position of the abutting block 41 in the control hole 212 can be fixed by the fixing bolt 43, and at this time, the two limit blocks 33 are also located in the installation hole 211 under the elastic force of the first spring 34. Then, the second mounting block 21 is directly placed in the receiving groove 111, the fixing bolt 43 is screwed to remove the fixing bolt 43, the abutting block 41 slides towards the mounting hole 211 and slides between the two sliders 31 under the elastic force of the second spring 424, the abutting block 41 also pushes the two sliders 31 to move in the opposite direction through the tapered inclined surface of the slider 31, the two sliders 31 also push the two limit blocks 33 to extend out of the mounting hole 211 through the mounting rod 32 until the two limit blocks 33 are all embedded into the limit groove 112, and thus the radial bone component 2 and the humeral bone component 1 are mounted.

It will be appreciated that the prosthesis may also be used in a replacement procedure to effect connection of the ulna and humerus, and when the ulna is cut short, the replacement procedure may be performed by directly connecting the radius assembly 2 to the ulna of the human body to restore the ulna's bending function. Compared with the rigid connection between the prosthesis used in the current replacement surgery, due to the arrangement of the first spring 34 and the second spring 424, the prosthesis is more in line with the daily behavior movement characteristics of the human body due to the flexible sliding fit of the sliding block 31 and the mounting rod 32, the stress is more reasonable, the flexibility is higher, and the service life of the prosthesis is greatly prolonged.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. An elbow prosthesis characterized by: the humerus assembly comprises a humerus assembly (1) installed at the lower end of a humerus, a radius assembly (2) installed at the proximal end of a radius and a connecting shaft assembly (3) arranged between the humerus assembly (1) and the radius assembly (2), wherein the humerus assembly (1) and the radius assembly (2) are rotatably connected through the connecting shaft assembly (3); humerus subassembly (1) orientation the confession of U-shaped has been seted up to the one end of radius subassembly (2) storage tank (111) of radius subassembly (2) embedding runs through the confession has been seted up at radius subassembly (2) both ends mounting hole (211) of connecting axle subassembly (3) embedding, the length direction of mounting hole (211) with the opening direction of storage tank (111) is perpendicular, seted up the confession in the relative both sides wall department of storage tank (111) on humerus subassembly (1) spacing groove (112) of connecting axle subassembly (3) embedding.

2. The elbow joint prosthesis of claim 1, wherein: connecting axle subassembly (3) are provided with two, two connecting axle subassembly (3) are followed mounting hole (211) length direction sets up side by side, radius subassembly (2) inside seted up with control hole (212) of mounting hole (211) intercommunication, install spacing subassembly (4) in control hole (212), spacing subassembly (4) include sliding connection in butt joint piece (41) in control hole (212), butt joint piece (41) slidable is to two connecting axle subassembly (3) between in order to promote two connecting axle subassembly (3) stretch out mounting hole (211) embedding spacing groove (112).

3. The elbow prosthesis of claim 2 wherein: connecting axle subassembly (3) include sliding connection and be in slider (31) in mounting hole (211), installation pole (32) and the rigid coupling that are located slider (31) and deviate from another connecting axle subassembly (3) one end are in installation pole (32) are kept away from stopper (33) of slider (31) one end, slider (31) orientation the confession has been seted up to the one end of installation pole (32) spout (311) of installation pole (32) embedding, the cover is equipped with first spring (34) on installation pole (32), first spring (34) are located stopper (33) with between slider (31).

4. An elbow prosthesis according to claim 3 wherein: the end, far away from the mounting rod (32), of the limiting block (33) is integrally hemispherical, and the limiting groove (112) is integrally hemispherical and is used for the limiting block (33) to be embedded.

5. An elbow prosthesis according to claim 3 wherein: the opposite ends of the two sliding blocks (31) are conical, and an elastic piece (42) for controlling the abutting block (41) to slide in the control hole (212) is further arranged in the control hole (212).

6. The elbow joint prosthesis of claim 5, wherein: one end, facing the mounting hole (211), of the abutting block (41) is conical so as to abut against the two sliding blocks (31).

7. The elbow joint prosthesis of claim 5, wherein: elastic component (42) are in including the rigid coupling fixed block (421), the rigid coupling in control hole (212) are in fixed block (421) orientation fixed cylinder (422) and the rigid coupling of butt joint piece (41) one end are in butt joint piece (41) orientation slide bar (423) of fixed block (421) one end, slide bar (423) are located in fixed cylinder (422) and with fixed cylinder (422) sliding fit, still the cover is equipped with second spring (424) on fixed cylinder (422), second spring (424) are located fixed block (421) with between butt joint piece (41).

8. An elbow prosthesis according to any one of claims 2 to 7 wherein: one side of the radius assembly (2) is in threaded connection with a fixing bolt (43), and the fixing bolt (43) is in threaded connection with the abutting block (41) so as to fix the position of the abutting block (41) in the control hole (212).

9. The elbow joint prosthesis of claim 1, wherein: humerus subassembly (1) wholly is the T shape, including be used for with radius subassembly (2) complex first installation piece (11) and rigid coupling are in first installation piece (11) is kept away from the first dead lever (12) of radius subassembly (2) one end, first installation piece (11) orientation the one end rigid coupling of first dead lever (12) has a plurality of short nails (13).