CN218943612U - Radius small head prosthesis - Google Patents

Abstract

The utility model relates to the field of prosthesis replacement, in particular to a small radius head prosthesis which comprises a medullary needle and a small radius head, wherein a connecting block is fixed at the top of the medullary needle, a connecting sleeve is fixed at the bottom of the small radius head, the connecting sleeve is sleeved with the connecting block, a fixing groove is arranged in the medullary needle, a fixing hole is arranged at the bottom of the medullary needle and is communicated with the fixing groove, a limit groove is further arranged at the bottom of the medullary needle, the limit groove is arranged around the medullary needle, a limit plate is formed on the medullary needle outside the limit groove, and limit holes are uniformly formed on the limit plate. Bone cement in the fixed slot is connected with bone cement in the marrow cavity into a whole through the bone cement on the fixed hole, after the bone cement is solidified, the marrow needle can not move in the marrow cavity, and the bone cement in the limit slot is integrated with the bone cement outside the marrow needle through the bone cement at the position of the limit hole, so that the movement of the marrow needle is further avoided, and the movement of the prosthesis after the replacement of the prosthesis is further avoided.

Description

Radius small head prosthesis

[ field of technology ]

The utility model relates to the field of prosthesis replacement, in particular to a radius small head prosthesis.

[ background Art ]

The elbow joint of human body comprises a distal humerus, a proximal ulna and a radius bone, wherein the fracture of the radius bone accounts for about 5.4% of all fractures of human body. At present, the most commonly used radius fracture parting mode in clinic is Mason parting comprising: type I fracture, no displacement fracture of the radius bone; type II fractures, partial fractures of the head of the radius and dislodgment (again including simple and comminuted partial fractures of the joint); type III fractures, the radius head joint is fully crushed. The radius head joint replacement has good curative effect in the aspect of treating the comminuted radius fracture of the type II and type III fracture, and has satisfactory clinical curative effect in medium and long term. Surgical indications are mainly comminuted fractures of the radius bone parts and the complete joint, especially when the bone mass exceeds 3. The operation method is that the outside incision exposes the radius bone, a miniature pendulum saw is used for cutting the radius bone at the radius neck part, the proximal medullary cavity of the radius is reamed to complete the anatomical matching of the prosthesis, then a prosthesis test mould is inserted, and after the size of the radius prosthesis is confirmed, the prosthesis with proper size is selected and installed.

The existing radius replacement prosthesis fully refers to the anatomical shape of the human radius, and comprises a radius small head and a radius intramedullary pin, such as patent application number: CN201510700984.9 discloses a radius small head replacement prosthesis, which comprises a radius small head and a radius intramedullary nail, wherein during replacement operation, the radius intramedullary nail is inserted into a radius intramedullary cavity to fix the radius intramedullary nail, but the radius intramedullary nail is not provided with an anti-drop device, and after the radius small head prosthesis is replaced, the intramedullary nail is easy to loose.

The utility model is researched and proposed for overcoming the defects of the prior art.

[ utility model ]

The object of the present utility model is to overcome the drawbacks of the prior art described above and to provide an effective radius small head prosthesis.

The utility model can be realized by the following technical scheme:

the utility model discloses a radius small head prosthesis, which comprises a marrow needle and a radius small head, wherein a connecting block is fixed at the top of the marrow needle, a connecting sleeve is fixed at the bottom of the radius small head, the connecting sleeve is sleeved with the connecting block, a fixing groove is arranged in the marrow needle, a fixing hole is arranged at the bottom of the marrow needle, the fixing hole is communicated with the fixing groove, a limiting groove is further arranged at the bottom of the marrow needle, the limiting groove is arranged around the marrow needle, a limiting plate is formed on the marrow needle outside the limiting groove, and limiting holes are uniformly formed on the limiting plate. When the prosthesis is implanted, the proximal radial cavity is expanded, bone cement is filled in the proximal radial cavity, the intramedullary nail is inserted into the proximal radial cavity, the small radial head is assembled at the top of the intramedullary nail, the connecting sleeve and the connecting block are inserted through the connecting sleeve and the connecting block, the prosthesis is replaced through the fixing of the connecting sleeve and the connecting block through the bolt penetrating through the connecting hole, the fixing hole is formed in the bottom of the intramedullary nail, the fixing groove is formed in the intramedullary nail, when the intramedullary nail is inserted into the bone cement, the bone cement enters the fixing groove through the fixing hole, the bone cement penetrates into the limiting groove through the limiting hole, the bone cement in the fixing groove is connected with the bone cement in the intramedullary cavity into a whole through the bone cement on the fixing hole after the bone cement is solidified, the intramedullary nail can not move in the intramedullary cavity after the bone cement is solidified, the prosthesis is effectively prevented from moving after the small radial head prosthesis is replaced, the bone cement is prevented from forming a whole with the bone cement outside the intramedullary nail through the position of the limiting hole, and the prosthesis is further prevented from moving after the prosthesis is replaced.

Preferably, the connecting sleeve is provided with a sunk connecting hole, and the connecting sleeve is fixed on the connecting block after penetrating through the connecting hole through a bolt.

Preferably, the marrow needle is also provided with a pressure relief hole communicated with the fixed groove. Through pressure release hole and fixed slot intercommunication, can make things convenient for bone cement to enter into in the fixed slot.

Preferably, the connecting block is T-shaped. The connecting block is T-shaped, so that the connecting block and the connecting hole can be effectively prevented from being separated.

Preferably, the surface of the marrow needle is also uniformly provided with meshes. Bone cement enters into the meshes to further avoid loosening of the marrow needle.

Preferably, the surface of the marrow needle is also provided with a plurality of anti-rotation grooves. Bone cement can be effectively prevented from rotating after entering the anti-rotation groove and being solidified.

Compared with the prior art, the utility model has the following advantages:

1. the bone cement in the fixed slot is connected with the bone cement in the marrow cavity into a whole through the bone cement on the fixed hole after the bone cement is solidified, and the marrow needle can not move in the marrow cavity after the bone cement is solidified, so that the movement of the prosthesis after the replacement of the radius small head prosthesis can be effectively avoided.

2. Bone cement permeates into the limiting groove through the limiting hole, after the bone cement is solidified, the bone cement in the limiting groove is integrated with the bone cement outside the marrow needle through the bone cement at the position of the limiting hole, so that the movement of the marrow needle is further avoided, and the movement of the prosthesis after the replacement of the prosthesis is further avoided.

[ description of the drawings ]

The utility model is described in further detail below with reference to the attached drawing figures, wherein:

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a front view of the present utility model;

FIG. 3 is a cross-sectional view taken at A-A of FIG. 2;

FIG. 4 is an enlarged view of FIG. 3 at B;

FIG. 5 is an exploded view of the present utility model;

in the figure: 1. a spinal needle; 2. small radius head; 3. connecting sleeves; 4. a connecting block; 5. a connection hole; 6. a bolt; 7. an anti-rotation groove; 8. a mesh; 9. a limiting hole; 10. a fixing hole; 11. a fixing groove; 12. a pressure relief hole; 13. a limit groove; 14. a limiting plate;

[ detailed description ] of the utility model

Embodiments of the present utility model will be described in detail below with reference to the attached drawings:

example 1:

as shown in fig. 1 and 5, the utility model discloses a radius small head prosthesis, which comprises a marrow needle 1 and a radius small head 2, wherein a connecting block 4 is fixed at the top of the marrow needle 1, a connecting sleeve 3 is fixed at the bottom of the radius small head 2, the connecting sleeve 3 is sleeved with the connecting block 4, a fixing groove 11 is arranged in the marrow needle 1, a fixing hole 10 is arranged at the bottom of the marrow needle 1, the fixing hole 10 is communicated with the fixing groove 11, a limit groove 13 is also arranged at the bottom of the marrow needle 1, the limit groove 13 is arranged around the marrow needle 1, a limit plate 14 is formed on the marrow needle 1 outside the limit groove 13, and limit holes 9 are uniformly arranged on the limit plate 14. When the prosthesis is implanted, the proximal radial cavity is expanded, bone cement is filled in the proximal radial cavity, the intramedullary nail 1 is inserted into the proximal radial cavity, the small radial head 2 is assembled at the top of the intramedullary nail 1, after the connecting sleeve 3 is inserted into the connecting block 4, the connecting sleeve 3 and the connecting block 4 are fixed through the connecting hole 5 through the bolt 6, the prosthesis is replaced, as the bottom of the intramedullary nail 1 is provided with the fixing hole 10, the fixing groove 11 is arranged in the intramedullary nail 1, when the intramedullary nail 1 is inserted into bone cement, the bone cement enters the fixing groove 11 through the fixing hole 10, and the bone cement is infiltrated into the limiting groove 13 through the limiting hole 9, after the bone cement is solidified, the bone cement in the fixing groove 11 is connected with the bone cement in the intramedullary cavity into a whole, after the bone cement is solidified, the intramedullary nail 1 does not move in the intramedullary cavity, the prosthesis is effectively prevented from moving after the prosthesis is replaced, and the bone cement in the limiting groove 13 is prevented from moving through the bone cement in the fixing hole 9 and the bone cement in the radial cavity, and the prosthesis is further prevented from moving outside the prosthesis.

Wherein, be provided with sunken connecting hole 5 on the adapter sleeve 3, adapter sleeve 3 passes connecting hole 5 through bolt 6 and fixes on connecting block 4.

Wherein, the marrow needle 1 is also provided with a pressure relief hole 12 communicated with the fixed groove 11. Through the pressure release hole 12 and the fixed slot 11, bone cement can conveniently enter the fixed slot 11.

Wherein the connecting block 4 is T-shaped. The connecting block 4 is T-shaped, so that the connecting block 4 and the connecting hole 5 can be effectively prevented from being separated.

Example 2:

the utility model discloses a radius small head prosthesis, which is characterized in that a plurality of anti-rotation grooves 7 are formed on the surface of a marrow needle 1 of the embodiment based on the structure and the principle of the embodiment 1. Bone cement can be effectively prevented from rotating the marrow needle 1 after the bone cement enters the anti-rotation groove 7 to be solidified.

Example 3:

the utility model discloses a radius small head prosthesis, which is characterized in that the surface of a marrow needle 1 of the embodiment is also uniformly provided with meshes 8 on the basis of the structure and the principle of the embodiment 1 or the embodiment 2. Bone cement enters the mesh 8 to further prevent loosening of the needle 1.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that various changes, modifications, substitutions and alterations can be made herein by those skilled in the art without departing from the technical principles of the present utility model, and such changes, modifications, substitutions and alterations are also to be regarded as the scope of the utility model.

Claims (5)

1. The utility model provides a radius small head prosthesis, contains marrow needle and radius small head, marrow needle top is fixed with the connecting block, radius small head bottom is fixed with the adapter sleeve, the adapter sleeve cup joints its characterized in that with the connecting block: the novel intramedullary nail is characterized in that a fixed groove is formed in the intramedullary nail, a fixed hole is formed in the bottom of the intramedullary nail, the fixed hole is communicated with the fixed groove, a limiting groove is further formed in the bottom of the intramedullary nail, the limiting groove surrounds the intramedullary nail, a limiting plate is formed on the intramedullary nail outside the limiting groove, and limiting holes are uniformly formed in the limiting plate.

2. The radius small head prosthesis of claim 1, wherein: the connecting sleeve is provided with a sunk connecting hole, and the connecting sleeve is fixed on the connecting block after penetrating through the connecting hole through a bolt.

3. The radius small head prosthesis of claim 1, wherein: the connecting block is T-shaped.

4. The radius small head prosthesis of claim 1, wherein: the surface of the marrow needle is also uniformly provided with meshes.

5. The radius small head prosthesis of claim 1, wherein: the surface of the marrow needle is also provided with a plurality of anti-rotation grooves.

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