CN219846739U - Hollow bone screw for intramedullary fixation - Google Patents

Abstract

The utility model discloses a hollow bone screw for intramedullary fixation, which comprises a bone screw body, a first screw and a second screw, wherein a fixed block is fixedly arranged at the top end of the first screw, limit grooves are symmetrically arranged on two sides of the inside of the fixed block, a limit block is sleeved on the outer surface of the second screw, and a clamping block is movably arranged on the limit block; according to the bone screw, when the bone screw body, the first screw, the second screw, the fixed block, the limiting groove, the limiting block and the clamping block are arranged in the fixed block in a threaded manner, the first screw and the second screw are arranged, the clamping block is contracted into the fixed block and is elastically clamped in the limiting groove, and when the bone screw body needs to be dismounted, the second screw is rotated at the moment, the clamping block and the limiting groove can rotate to be out with the second screw due to the action of the clamping block and the limiting groove during rotation, so that the problem that the first screw stays in a bone of a patient when the second screw is dismounted in a rotating manner is solved.

Description

Hollow bone screw for intramedullary fixation

Technical Field

The utility model relates to the technical field of hollow bone screws for intramedullary fixation, in particular to a hollow bone screw for intramedullary fixation.

Background

Bone screws are commonly used for fixation of internal fractures/dislocation, the fixation of the fracture being achieved by screwing directly into two different bone pieces or into an internal implant such as a fixed bone plate, positioning the bone and promoting its healing, according to the published application number of the chinese patent net: 202123297199.3 this patent and discloses a hollow bone screw for intramedullary fixation, contains first screw and second screw, be provided with the through-hole that runs through first screw on the first screw, be provided with the spacing groove on the first screw inner wall of through-hole bottom, the inside supporting shoe that is provided with through-hole sliding connection of through-hole, the supporting shoe bottom is fixed with the end cap, be fixed with the stopper with the cooperation equipment of aforementioned spacing groove on the supporting shoe, the stopper is made by elastic material, still be provided with the bracing piece in the through-hole, still be provided with the fixed cover on the first screw, the second screw bottom is provided with the connecting rod. The bottom opening of the first screw is sealed through the plug, bone tissue can be prevented from growing, the first screw is conveniently taken down, the support rod is inserted into the through hole of the first screw, the through hole is supported by the support rod, the first screw is effectively prevented from being extruded and deformed by stress, the bone screw can be installed, but when the screw is removed, only the second screw outside is detached, the second screw can be detached only by the fixing block and the threads of the second screw, the first screw can be left in the body, the detachment cannot be completed, and in order to recover the bone of a patient, the bone screw can be detached, and the hollow bone screw for bone marrow internal fixation is provided.

Disclosure of Invention

In order to solve the defects that in the prior art, when the screw is detached, only the second screw outside is detached, and the second screw can only be detached due to the threads of the fixed block and the second screw, and the first screw can be left in the body and cannot be detached, the utility model provides the hollow bone screw for intramedullary fixation.

In order to solve the technical problems, the utility model provides the following technical scheme:

the utility model discloses a hollow bone screw for bone marrow internal fixation, which comprises a bone screw body, a first screw and a second screw, wherein the second screw is inserted into the first screw, a fixed block is fixedly arranged at the top end of the first screw, limit grooves are symmetrically arranged on two sides of the inside of the fixed block, a limit block is sleeved on the outer surface of the second screw, and a clamping block is movably arranged on the limit block.

As a preferable technical scheme of the utility model, a telescopic groove is formed in the limiting block, a reinforcing rod is fixedly arranged in the telescopic groove, and a spring is sleeved on the outer surface of the reinforcing rod.

As a preferable technical scheme of the utility model, a thread groove is formed in the fixing block, a thread ring is arranged on the outer surface of the limiting block, and the thread ring and the thread groove are matched with each other for use.

As a preferable technical scheme of the utility model, the clamping blocks are symmetrically arranged on two sides of the limiting block, the bottom ends of the two clamping blocks are designed into round corners, and the two clamping blocks and the limiting groove are matched with each other for use.

As a preferable technical scheme of the utility model, the limiting block and the top end of the fixed block are on the same horizontal plane after the first screw and the second screw are installed.

As a preferable technical scheme of the utility model, the telescopic slots and the clamping blocks are correspondingly arranged and matched with each other for use, one end of the reinforcing rod is movably arranged in the clamping block, a slot for the reinforcing rod to move is arranged in the clamping block, and each clamping block can be contracted in the telescopic slot.

As a preferable technical scheme of the utility model, one ends of the two springs are fixedly connected to the inner wall of the telescopic groove, and the other ends of the two springs are fixedly connected to the outer wall of the clamping block.

The beneficial effects of the utility model are as follows:

this kind of a hollow bone screw for bone marrow internal fixation, through bone screw body, first screw, the second screw, the fixed block, the spacing groove, stopper and fixture block, when the stopper screw thread is installed inside the fixed block, first screw and second screw accomplish the installation, the fixture block shrink gets into in the fixed block simultaneously, rebound card is wherein in getting into the spacing groove, when needs butt joint bone screw body dismantles, through rotatory second screw this moment, because the effect of fixture block and spacing groove when rotatory, can take the second screw to rotate out, the problem of first screw stay patient bone when rotatory dismantlement to the second screw has been solved.

Drawings

The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the embodiments of the utility model, serve to explain the utility model. In the drawings:

FIG. 1 is a schematic view of a cannulated bone screw for intramedullary fixation according to the present utility model;

FIG. 2 is a schematic view of a first screw of the construction of a cannulated bone screw for intramedullary fixation in accordance with the present utility model;

FIG. 3 is a schematic view of a first screw and a fixation block of a cannulated bone screw for intramedullary fixation in accordance with the present utility model;

FIG. 4 is a schematic view of a second screw, stopper and cartridge of a cannulated bone screw for intramedullary fixation in accordance with the present utility model;

fig. 5 is an internal cross-sectional view of a structural fixation block of a cannulated bone screw for intramedullary fixation in accordance with the present utility model.

In the figure: 1. a bone screw body; 2. a first screw; 3. a second screw; 4. a fixed block; 5. a limit groove; 6. a limiting block; 7. a clamping block; 8. a telescopic slot; 9. a reinforcing rod; 10. a spring; 11. a thread groove; 12. a thread ring.

Detailed Description

The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present utility model only, and are not intended to limit the present utility model.

Examples: as shown in fig. 1-5, the hollow bone screw for intramedullary fixation comprises a bone screw body 1, a first screw 2 and a second screw 3, wherein the second screw 3 is inserted into the first screw 2, a fixed block 4 is fixedly arranged at the top end of the first screw 2, limit grooves 5 are symmetrically arranged on two sides of the inside of the fixed block 4, a limit block 6 is sleeved on the outer surface of the second screw 3, and a clamping block 7 is movably arranged on the limit block 6.

The inside of the limiting block 6 is provided with a telescopic groove 8, a reinforcing rod 9 is fixedly arranged in the telescopic groove 8, and a spring 10 is sleeved on the outer surface of the reinforcing rod 9.

The inside of fixed block 4 is provided with screw thread groove 11, and the surface of stopper 6 is provided with screw thread circle 12, and the use of mutually supporting between screw thread circle 12 and the screw thread groove 11 is installed first screw 2 and second screw 3 screw thread installation in screw thread groove 11 through screw thread circle 12.

Wherein, fixture block 7 symmetry sets up in the both sides of stopper 6, and the bottom of two fixture blocks 7 is the fillet design, mutually support between two fixture blocks 7 and the spacing groove 5 and use, can be when screw thread circle 12 and the installation of screw thread groove 11 screw thread, can not take place the motion when the design of fixture block 7 bottom fillet can make its shrink to interfere for it is more steady during the installation.

The limiting block 6 and the top end of the fixed block 4 are arranged on the same horizontal plane after the first screw 2 and the second screw 3 are installed, so that an unnecessary part can not be generated during installation, and bones are prevented from growing into the unnecessary part, so that the bone is not easy to dismantle during the dismantling process.

Wherein, flexible groove 8 and fixture block 7 are corresponding to be set up and the two mutually support the use, the one end activity of stiffener 9 sets up in the inside of fixture block 7, the inside of fixture block 7 is provided with the groove that supplies stiffener 9 activity, every fixture block 7 can shrink in the shrink groove, after installation first screw 2 and second screw 3 are installed, fixture block 7 can rotate and rebound to in the spacing groove 5, realize card and effect, when demolising bone screw body 1, the effect of stiffener 9 under can prevent that fixture block 7 from breaking in fixed block 4, make first screw 2 can not stay in the bone.

Wherein, the one end fixed connection of two springs 10 is at the inner wall of expansion tank 8 and the outer wall of the other end fixed connection fixture block 7, can realize the elasticity effect of fixture block 7, and the action of card in spacing groove 5 when shrink and rebound when accomplishing the installation.

During operation, through bone screw body 1, first screw 2, second screw 3, fixed block 4, spacing groove 5, stopper 6 and fixture block 7, when stopper 6 screw thread installation is inside fixed block 4, first screw 2 and second screw 3 accomplish the installation, fixture block 7 shrink simultaneously gets into fixed block 4, get into in the spacing groove 5 rebound card wherein, when needs dismantle bone screw body 1, at this moment through rotatory second screw 3, owing to the effect of fixture block 7 and spacing groove 5 during the rotation, can take the second screw 3 to rotate out, the problem of first screw 2 stay in patient bone when rotatory dismantlement to second screw 3 has been solved.

Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present utility model, and the present utility model is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present utility model has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (7)

1. The utility model provides a hollow bone screw for intramedullary fixation, includes bone screw body (1), first screw (2) and second screw (3), first screw (2) are inside to be inserted and are equipped with second screw (3), a serial communication port, first screw (2) top fixed mounting fixed block (4), the inside bilateral symmetry of fixed block (4) is provided with spacing groove (5), second screw (3) surface cover is equipped with stopper (6), the activity is provided with fixture block (7) on stopper (6).

2. The hollow bone screw for intramedullary fixation according to claim 1, wherein a telescopic slot (8) is provided in the stopper (6), a reinforcing rod (9) is fixedly installed in the telescopic slot (8), and a spring (10) is sleeved on the outer surface of the reinforcing rod (9).

3. The hollow bone screw for intramedullary fixation according to claim 1, wherein a thread groove (11) is provided in the interior of the fixed block (4), a thread ring (12) is provided on the outer surface of the stopper (6), and the thread ring (12) and the thread groove (11) are used in cooperation with each other.

4. The hollow bone screw for intramedullary fixation according to claim 1, wherein the clamping blocks (7) are symmetrically arranged at two sides of the limiting block (6), the bottom ends of the two clamping blocks (7) are designed as round corners, and the two clamping blocks (7) and the limiting groove (5) are matched with each other for use.

5. A cannulated bone screw for intramedullary fixation according to claim 1, characterized in that the stop block (6) is on the same level as the top end of the fixation block (4) after the first screw (2) and the second screw (3) are mounted.

6. The hollow bone screw for intramedullary fixation according to claim 2, characterized in that the expansion groove (8) is provided corresponding to the clamping block (7) and is used in cooperation with the clamping block, one end of the reinforcing rod (9) is movably arranged inside the clamping block (7), a groove for the reinforcing rod (9) to move is provided inside the clamping block (7), and each clamping block (7) can be contracted in the expansion groove.

7. A cannulated bone screw for intramedullary fixation according to claim 2, characterized in that one end of the two springs (10) is fixedly connected to the inner wall of the expansion slot (8) and the other end is fixedly connected to the outer wall of the clamping block (7).