CN218922756U

CN218922756U - Lateral fixing blocking screw for cup

Info

Publication number: CN218922756U
Application number: CN202223511216.3U
Authority: CN
Inventors: 张瑗; 李�杰
Original assignee: Second Affiliated Hospital Army Medical University
Current assignee: Second Affiliated Hospital Army Medical University
Priority date: 2022-12-28
Filing date: 2022-12-28
Publication date: 2023-04-28
Anticipated expiration: 2032-12-28

Abstract

The utility model provides a fixed screw that blocks of mortar cup side, includes the screw, screw and a spacing seat pass through screw-thread fit fixed connection, be equipped with the shoulder hole that is used for installing the screw on the spacing seat, the minor diameter section of shoulder hole be with screw-thread fit's internal thread hole, be equipped with radial inwardly extending's sphere recess on the spacing seat periphery wall, the sphere recess is used for laminating with the mortar cup surface. The utility model provides a lateral fixing blocking screw of a cup, which increases the contact area with the cup, ensures uniform stress on the contact part, increases the stability of the cup and improves the operation effect.

Description

Lateral fixing blocking screw for cup

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a lateral fixing blocking screw for a cup.

Background

During the total hip replacement operation, sometimes there is a case of acetabular outside bone defect, the acetabular outside bone defect can cause the acetabular cup stress abnormality, and the acetabular cup is unstable and loose, so after the acetabular cup is implanted, the acetabular cup is usually fixed by using conventional acetabular screws, and then one or more acetabular screws are implanted in the acetabular outside bone defect position, so that the stress of the acetabular cup is uniform, and the stability of the acetabular cup is improved. However, when the acetabular screw is used for fixing the acetabular cup from the side part of the acetabular cup, the head of the acetabular screw forms line contact or point contact with the surface of the acetabular cup, the contact area is small, the stress at the contact position is too concentrated, the acetabular cup is easy to fail to fix, and the stability of the acetabular cup is reduced. In addition, in the operation process of fixing the acetabular cup, the acetabular cup is generally implanted firstly, then the acetabular screw is implanted to fix the lateral side of the acetabular cup, when the acetabular screw is implanted in a screwing mode, once the head of the acetabular screw is too tightly attached to the acetabular cup, friction is easily generated between the acetabular screw and the acetabular cup, the acetabular cup is easy to wear, even dents are generated, and metal fragments and wear particles generated by the friction are easy to have adverse effects on surrounding tissues, so that the operation effect is easily influenced; once a gap is reserved between the head of the acetabular screw and the acetabular cup, the acetabular cup is unstable in fixation, and the prognosis effect is seriously affected.

Disclosure of Invention

The utility model aims to overcome the defects in the prior art, and provides a lateral fixing blocking screw for a acetabular cup, which solves the problems that the contact area between a conventional acetabular screw and the acetabular cup is small, the stress at the contact position is too concentrated, the fixation failure is easy to cause, the stability of the acetabular cup is reduced, friction is easy to occur between the acetabular cup and the acetabular cup in the implantation process, the acetabular cup is worn, even dents are generated, and the operation effect is influenced.

The purpose of the utility model is realized in the following way:

the utility model provides a fixed screw that blocks of mortar cup side, includes the screw, screw and a spacing seat pass through screw-thread fit fixed connection, be equipped with the shoulder hole that is used for installing the screw on the spacing seat, the minor diameter section of shoulder hole be with screw-thread fit's internal thread hole, be equipped with radial inwardly extending's sphere recess on the spacing seat periphery wall, the sphere recess is used for laminating with the mortar cup surface.

The outer peripheral wall of the limiting seat is in an arc surface structure.

The head of the screw is limited at a limiting step between the large-diameter section and the small-diameter section of the stepped hole, and the screw rod part of the screw is in threaded fit with the small-diameter section of the stepped hole and extends out of the small-diameter section.

The spherical groove is a minor arc groove.

The stepped hole is a stepped straight hole extending along the axial direction of the limiting seat.

The stepped hole is a stepped inclined hole, and the included angle alpha between the central axis of the stepped inclined hole and the central axis of the limiting seat is 5-15 degrees.

The utility model discloses a lateral fixed blocking screw of a cup, which comprises a screw, wherein the screw is fixedly connected with a limiting seat through threaded fit, a stepped hole for installing the screw is formed in the limiting seat, and a small-diameter section of the stepped hole is an internal threaded hole in threaded fit with the screw. When the lateral fixed blocking screw of the mortar cup is implanted, the lateral fixed blocking screw is tightly attached to the surface of the mortar cup through the limiting seat, so that the mortar cup is tightly attached to the mortar cup, friction is prevented from occurring between the lateral fixed blocking screw and the mortar cup in the screw implantation process, abrasion of the mortar cup is further prevented, dents are even generated, metal fragments and abrasion particles generated in the mortar cup are avoided, and the operation effect is guaranteed. The outer peripheral wall of the limiting seat is provided with a spherical groove extending radially inwards, and the spherical groove is used for being attached to the outer surface of the cup. Thereby realizing the fixed face contact of blocking screw and the cup of cup side, increasing area of contact, ensure the stability of cup.

The lateral fixed blocking screw of the mortar cup has the advantages that the structure is simple, the operation is easy, the contact area with the surface of the mortar cup is increased through the limiting seat, the stress on the contact part is uniform, the lateral fixed blocking screw of the mortar cup is enabled to be tightly attached to the mortar cup, the stability of the mortar cup is improved, friction with the mortar cup can not occur in the implantation process, the surface integrity of the mortar cup is ensured, and the operation effect is improved.

Drawings

FIG. 1 is a schematic view of a lateral retaining screw of a cup;

FIG. 2 is a top view of the cup side set blocking screw;

FIG. 3 is a view in the direction A of FIG. 2;

fig. 4 is a schematic structural diagram of a limiting seat in embodiment 1;

FIG. 5 is a schematic view of a lateral retaining screw of the cup of example 2;

fig. 6 is a schematic structural diagram of a limiting seat in embodiment 2;

FIG. 7 is a view of the cup side set blocking screw mated with the cup.

Detailed Description

Embodiment 1, refer to fig. 1 through 4, a lateral fixed blocking screw of mortar cup, including screw 2, screw 2 passes through screw-thread fit fixed connection with a spacing seat 1, be equipped with the shoulder hole 4 that is used for installing screw 2 on the spacing seat 1, the minor diameter section of shoulder hole 4 is the internal thread hole with screw 2 screw-thread fit. The stepped hole 4 is a stepped straight hole extending along the axial direction of the limit seat 1. The head of the screw 2 is limited at a limiting step between the large-diameter section and the small-diameter section of the stepped hole 4, the screw rod part of the screw 2 is in threaded fit with the small-diameter section of the stepped hole 4, and the small-diameter section extends outwards to be matched with bones. The top end of the head of the screw 2 is provided with an inner hexagonal counter bore which is used for being matched with a hexagonal wrench to screw the screw 2. The outer peripheral wall of the limiting seat 1 is in an arc surface structure, so that the interference to surrounding tissues in the implantation process is effectively avoided. The limiting seat 1 is characterized in that a spherical groove 3 extending radially inwards is formed in the peripheral wall of the limiting seat, and the spherical groove 3 is a minor arc groove. The spherical groove 3 is used for being attached to the outer surface of the cup. Thereby make screw 2 realize the closely laminating of face contact through spacing 1 sphere recess 3 and cup, increase with the cup area of contact, guarantee the stability of cup, prevent that the screw from implanting the in-process and taking place wearing and tearing to the cup surface.

The screw 2 of this embodiment is the cancellous bone locking screw of diameter 6.5mm, and the axial length of spacing seat 1 is 10mm, and the big footpath section aperture of shoulder hole is 8mm, and the minor diameter section is the internal thread hole that matches with the cancellous bone locking screw of 6.5mm, and the size of sphere recess 3 can select different sizes according to the mortar cup size that uses.

Embodiment 2, refer to fig. 5 through 7, a lateral fixed blocking screw of mortar cup, including screw 2, screw 2 passes through screw-thread fit fixed connection with a spacing seat 1, be equipped with the shoulder hole 4 that is used for installing screw 2 on the spacing seat 1, the minor diameter section of shoulder hole 4 is the internal thread hole with screw 2 screw-thread fit. The step hole 4 is a step inclined hole, the included angle alpha between the central axis of the step inclined hole and the central axis of the limit seat 1 is 5-15 degrees, and the included angle alpha between the central axis of the step inclined hole and the central axis of the limit seat 1 in the embodiment is 15 degrees. The implantation direction of the lateral fixed blocking screw of the mortar cup is more flexible and changeable through the stepped inclined hole, and the mortar cup adapts to the unused condition. The head of the screw 2 is limited at a limiting step between the large-diameter section and the small-diameter section of the stepped hole 4, the screw rod part of the screw 2 is in threaded fit with the small-diameter section of the stepped hole 4, and the small-diameter section extends outwards to be matched with bones. The top end of the head of the screw 2 is provided with an inner hexagonal counter bore which is used for being matched with a hexagonal wrench to screw the screw 2. The outer peripheral wall of the limiting seat 1 is in an arc surface structure, so that the interference to surrounding tissues in the implantation process is effectively avoided. The limiting seat 1 is characterized in that a spherical groove 3 extending radially inwards is formed in the peripheral wall of the limiting seat, and the spherical groove 3 is a minor arc groove. The spherical groove 3 is used for being attached to the outer surface of the cup. Thereby the screw 2 realizes the surface-surface contact with the cup through the spherical groove 3 of the limit seat 1, increases the contact area with the cup, and ensures the stability of the cup.

The acetabular cup lateral fixation blocking screw of the utility model is operated during joint replacement procedures by machining the acetabular fossa to a proper size using an acetabular milling file. The cup is knocked and implanted, and the cup is conventionally fixed by using two acetabular screws. According to bone defect position bone condition, select the spacing seat that is equipped with ladder straight hole or be equipped with the spacing seat of ladder inclined hole, fix the spacing seat suitable position on the mortar cup through the instrument, make the sphere recess of spacing seat closely laminate with the mortar cup surface, screw the screw sleeve in the shoulder hole of spacing seat, use the electric drill to carry out bone face drilling to suitable degree of depth through screw sleeve location position, take out the screw sleeve, put into screw locking spacing seat. And (5) implanting bone cement into the bone defect part to finish the operation.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the utility model, and those skilled in the art will appreciate that the modifications made to the utility model fall within the scope of the utility model without departing from the spirit of the utility model.

Claims

1. The utility model provides a fixed screw that blocks of mortar cup side, includes screw (2), its characterized in that, screw (2) pass through screw-thread fit fixed connection with a spacing seat (1), be equipped with on spacing seat (1) and be used for mounting screw (2) shoulder hole (4), the minor diameter section of shoulder hole (4) be with screw (2) screw-thread fit's internal thread hole, be equipped with radial inwards extension's sphere recess (3) on spacing seat (1) peripheral wall, sphere recess (3) are used for laminating with the mortar cup surface.

2. The cup side set blocking screw of claim 1, wherein: the outer peripheral wall of the limit seat (1) is in an arc surface structure.

3. The cup side set blocking screw of claim 1, wherein: the head of the screw (2) is limited on a limiting step between the large-diameter section and the small-diameter section of the stepped hole (4), and the screw rod part of the screw (2) is in threaded fit with the small-diameter section of the stepped hole (4) and extends out of the small-diameter section.

4. The cup side set blocking screw of claim 1, wherein: the spherical groove (3) is a minor arc groove.

5. The cup side set blocking screw of claim 1, wherein: the stepped hole (4) is a stepped straight hole extending along the axial direction of the limit seat (1).

6. The cup side set blocking screw of claim 1, wherein: the stepped hole (4) is a stepped inclined hole, and the included angle alpha between the central axis of the stepped inclined hole and the central axis of the limiting seat (1) is 5-15 degrees.