CN216317912U - Fusion cage - Google Patents

Abstract

The application relates to a fusion cage, which comprises a fusion cage main body and at least two locking screws arranged on the fusion cage main body; the fusion cage main body comprises an upper main body and a lower main body fixedly connected to the lower end of the upper main body, the upper main body and the lower main body are both plate-shaped and are of a T-shaped structure, locking screw holes are formed in the upper end of the upper main body, and at least two locking screw holes are formed for mounting locking screws. The fusion cage has the effect of effectively solving the problem that the existing fusion cage can cause great surgical trauma when being implanted into an operation.

Description

Fusion cage

Technical Field

The application relates to the field of orthopedic medical instruments, in particular to a fusion cage.

Background

Spinal fusion is currently one of the most common surgical techniques used in spinal surgery, and is now widely used to treat a variety of spinal surgical conditions, including spinal congenital conditions, deformities, degenerative conditions, and spinal fractures.

Taking the intervertebral-foramina-lumbar intervertebral bone grafting fusion (TLIF) as an example, when performing an operation, the existing fusion cage needs to make a median straight incision along the spinous process with a diseased segment as the center, and then implant the fusion cage through the steps of positioning, expanding the intervertebral space, placing a drill sleeve, testing a mold and the like.

In view of the above-mentioned related arts, the inventor believes that most of the existing fusion devices require that the site where the fusion device is implanted be completely opened when the fusion device is implanted, most of the spinal joints are exposed, and then the fusion device is implanted and operated, which causes great surgical trauma.

SUMMERY OF THE UTILITY MODEL

In order to effectively solve current fusion cage when carrying out the implantation operation, can cause great operative wound's problem, this application provides a fusion cage.

The fusion cage provided by the application adopts the following technical scheme:

a fusion cage comprises a fusion cage main body and two locking screws fixedly connected to the fusion cage main body;

the fusion cage main body comprises an upper main body and a lower main body arranged at the lower end of the upper main body, the upper main body and the lower main body are both plate-shaped and are of a T-shaped structure, and two locking screw holes used for installing locking screws are formed in the upper main body.

Through adopting above-mentioned technical scheme, fix the backbone as a joint fixation art, can insert as the wicresoft hand to can be used for strengthening other joint fixation arts and stable technique, the position thickness that this integration ware was implanted the human body is low, and it is many to plant the bone, makes the spinal fusion operation simpler, and the wound is littleer. The fusion cage is applicable to the following symptoms: degenerative disc disease and degenerative facet joint disease.

Optionally, a through hole penetrating through the upper main body is formed in the upper end of the upper main body and between the two locking screw holes;

the lower main body is provided with a communicating hole penetrating through the lower main body, and the communicating hole is a strip-shaped hole and one end of the communicating hole is communicated with the through hole.

Through adopting above-mentioned technical scheme, intercommunicating pore and through-hole combined action provide the guide for inserting the kirschner wire in the operation, can peel off human tissue as far as possible, form the path of entry of little wound, expose human tissue to the minimum, can avoid exposing the procedure of nerve and great vessel simultaneously.

Optionally, the lower main body is provided with an implant through hole penetrating through the lower main body, and the implant through hole and the communication hole are arranged at intervals.

By adopting the technical scheme, the implant through hole can be used for placing bone graft or bone substitute, and provides the optimal condition for the fusion between bones.

Optionally, the two side plate surfaces of the lower main body are respectively machined with teeth at intervals.

By adopting the technical scheme, the teeth can stimulate the joints and promote the joint growth, thereby achieving better fusion effect.

Optionally, at least one guide groove is formed in the side edge of each tooth on the two side plate surfaces of the lower main body.

By adopting the above technical solution, the guide groove can prevent the cage from translating and allow contact between the subchondral bone and the implant.

Optionally, two holding grooves are respectively formed on two opposite sides of the circumferential surface of the upper main body.

Through adopting above-mentioned technical scheme, operating personnel can hold and get the ware through holding to get the groove and more conveniently using to hold the ware and get.

Optionally, a rectangular thread is formed on a section of the peripheral surface of the locking screw away from the tip, and a trapezoidal thread is formed on a section of the peripheral surface between the tip of the locking screw and the rectangular thread.

Through adopting above-mentioned technical scheme, rectangular thread and locking screw hole cooperation, and rectangular thread can effectively guarantee that the askew condition of twisting can not appear in the locking screw. The trapezoidal thread part is screwed into the spinal joint, the connection strength of the screw and the spinal column is enhanced, and the trapezoidal thread is sharper, so that the trapezoidal thread part can be connected with the spinal column more quickly.

Optionally, a notch is machined into the tip of the locking screw.

By adopting the technical scheme, the notch enables the tip of the locking screw to be sharper, and the locking screw can be further conveniently screwed into the spine.

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

the spinal fusion surgery is simpler and has less trauma by arranging the fusion cage main body and the locking screw arranged on the fusion cage main body;

through the through hole which is arranged at the upper end of the upper main body and is positioned between every two locking screw holes and penetrates through the upper main body, the through hole can play a guiding role, the surgical positioning is convenient, and the positioning of the implantation position of the surgical fusion device is not needed after the spine is exposed;

set up the intercommunicating pore that runs through main part down on the main part, the intercommunicating pore is bar hole and one end intercommunication through-hole, intercommunicating pore and through-hole combined action for inserting the kirschner wire in the operation provides the guide, can peel off human tissue as far as possible, form the path of entry of wounding for a short time, expose human tissue to the minimum, can avoid exposing the procedure of nerve and great vessel simultaneously.

Drawings

Fig. 1 is a schematic structural view of a fusion cage.

Fig. 2 is a schematic structural view of the fusion cage.

Fig. 3 is a side view of the cage body.

Fig. 4 is a front view of the cage body.

Fig. 5 is a schematic view of the structure of the locking screw.

Description of reference numerals: 1. a fusion cage main body; 11. an upper body; 111. a locking screw hole; 112. a groove; 113. a through hole; 114. a holding groove; 12. a lower body; 121. an implant through hole; 122. a communicating hole; 123. a guide groove; 124. teeth; 1241. a first bar tooth; 1242. a second bar tooth; 1243. a third bar tooth; 2. a locking screw; 21. a rectangular thread; 22. trapezoidal threads; 23. and (4) a notch.

Detailed Description

The present application is described in further detail below with reference to figures 1-5.

The embodiment of the application discloses a fusion cage. Referring to fig. 1, a fusion cage includes a cage body 1, and two locking screws 2 mountable at both sides of the cage body 1.

Referring to fig. 2 and 3, the fusion cage body 1 includes an upper body 11 and a lower body 12 integrally formed at a lower end of the upper body 11, the upper body 11 and the lower body 12 are in a T-shaped structure, the upper body 11 and the lower body 12 are both in a plate-shaped structure, and the upper body 11 is a strip-shaped plate.

Two locking screw holes 111 are provided at intervals on the upper body 11, and a groove 112 is provided on the upper body 11. The two locking screws 2 can be respectively connected in the two locking screw holes 111, the connecting line of the two locking screw holes 111 is parallel to the length direction of the upper main body 11, the included angle of the extension lines of the axes of the two locking screw holes 111 is an acute angle, and the opening of the included angle faces the lower main body 12. The groove 112 is located on the plate surface of the upper main body 11 departing from the lower main body 12, the groove 112 is located between the two locking screw holes 111, and two ends of the groove 112 are respectively communicated with the two locking screw holes 111.

A through hole 113 is formed at the midpoint of the bottom of the groove 112, and two ends of the through hole 113 are respectively communicated with the upper and lower plate surfaces of the upper main body 11.

In combination with fig. 1 and fig. 2, two arc notches are symmetrically formed on two side surfaces of the upper main body 11 in the length direction, and the arc notches are located in the middle of the upper main body 11 in the length direction. A holding groove 114 is respectively arranged in the two arc-shaped notches, and the length direction of the holding groove 114 is parallel to the length direction of the upper main body 11.

Referring to fig. 3 and 4, the thickness of the lower body 12 is equal to the distance between the two locking screw holes 111, and one end of the lower body 12 away from the upper body 11 is formed in an arc shape. The joints of the two plate surfaces of the lower main body 12 and the upper main body 11 are both processed and formed with arc surfaces, so that the fusion cage can be better attached to the spine. The joints between the two side surfaces of the lower body 12 and the surface of the upper body 11 are also formed into arc surfaces, and the two side surfaces of the lower body 12 protrude out of the two holding grooves 114.

Referring to fig. 3 and 4, two implant through holes 121 are symmetrically formed in the lower body 12 to penetrate through the plate surface of the lower body 12 for receiving bone graft or bone substitute to provide optimal bone fusion conditions.

The lower main body 12 is provided with a communicating hole 122 which runs through the plate surface of the lower main body 12, the communicating hole 122 is a strip-shaped hole and one end of the communicating hole 113 is communicated with the communicating hole, so that the kirschner wire can be conveniently inserted in the operation to provide guidance. The communication hole 122 is located between the two implant through holes 121, and the center line of the communication hole 122 in the length direction coincides with the center line of the lower body 12. The end of the communication hole 122 near the upper body 11 is formed in a semicircular shape, and the end of the communication hole 122 far from the upper body 11 is lower than the lower edge of the implant through hole 121.

With reference to fig. 3 and 4, two sets of teeth 124 are formed on two plate surfaces of the lower body 12 at intervals along the length direction of the lower body 12, and each set of teeth 124 includes a first rack tooth 1241, a second rack tooth 1242, and a third rack tooth 1243. Both ends of the first bar-shaped tooth 1241 and the second bar-shaped tooth 1242 are respectively machined to the edge of the plate surface of the lower main body 12. The second bar-shaped tooth 1242 is broken into two sections at the implant through hole 121, and both ends of the third bar-shaped tooth 1243 are flush with the upper and lower edges of the communicating hole 122, respectively.

Referring to fig. 4, a guide groove 123 is formed on the plate surface of the lower body 12 along the length direction of the lower body 12 and between two adjacent teeth 124, and the guide groove 123 can prevent the cage from translating and allow the subchondral bone to contact the implant.

Referring to fig. 5, one end of the locking screw 2 is processed to be a tip, two sections of threads are processed on the locking screw 2, a rectangular thread 21 is processed on a peripheral surface of a section of the locking screw 2 far away from the tip, and the rectangular thread 21 can be matched with the threads of the locking screw hole 111, so that the locking screw 2 can be connected to the upper main body 11, and the locking screw 2 can be effectively prevented from being twisted askew.

A trapezoidal thread 22 is processed on a section of peripheral surface between the tip of the locking screw 2 and the rectangular thread 21, the trapezoidal thread 22 can be screwed into a spinal joint, the strength of connection between the locking screw 2 and a spinal column is enhanced, the trapezoidal thread 22 is sharper, and faster connection can be realized when the locking screw is connected with the spinal column. A notch 23 is also formed at the tip of the locking screw 2, and the notch 23 makes the tip of the locking screw 2 sharper, which further facilitates the screwing of the locking screw 2 into the spinal column.

The implementation principle of the fusion cage in the embodiment of the application is as follows: the spine fixation is used as a joint fixation method, during surgery, a cage body 1 is placed into a loading station by using a holder, then a filling material (such as a bone graft or a bone substitute) is firmly pressed into an implant through hole 121 by using a graft punch, then the cage is inserted into a joint by using an instrument, and then a locking screw 2 is screwed in to complete the implantation of the cage, so that the spine fusion surgery is simpler and has less trauma.

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 (8)

1. A fusion cage, characterized by: the fusion cage comprises a fusion cage body (1) and two locking screws (2) fixedly connected to the fusion cage body (1), wherein the number of the locking screws (2) is two;

the fusion cage main body (1) comprises an upper main body (11) and a lower main body (12) arranged at the lower end of the upper main body (11), wherein the upper main body (11) and the lower main body (12) are both in a plate shape and are in a T-shaped structure, and two locking screw holes (111) used for installing locking screws (2) are formed in the upper main body (11).

2. A fusion device according to claim 1, wherein: a through hole (113) penetrating through the upper main body (11) is formed in the upper end of the upper main body (11) and between the two locking screw holes (111);

the lower main body (12) is provided with a communicating hole (122) penetrating through the lower main body (12), the communicating hole (122) is a strip-shaped hole, and one end of the communicating hole is communicated with the through hole (113).

3. A fusion device according to claim 2, wherein: an implant through hole (121) penetrating through the lower main body (12) is formed in the lower main body (12), and the implant through hole (121) and the communication hole (122) are arranged at intervals.

4. A fusion cage according to claim 3, wherein: teeth (124) are respectively machined on two plate surfaces of the lower main body (12) at intervals.

5. A fusion device according to claim 4, wherein: at least one guide groove (123) is arranged on the two plate surfaces of the lower main body (12) and positioned at the side edge of each tooth (124).

6. A fusion device according to claim 1, wherein: two holding grooves (114) are respectively arranged on two opposite sides of the peripheral surface of the upper main body (11).

7. A fusion device according to claim 1, wherein: rectangular threads (21) are machined and formed on the peripheral surface of one section of the locking screw (2) far away from the tip, and trapezoidal threads (22) are machined and formed on the peripheral surface of one section of the locking screw (2) between the tip and the rectangular threads (21).

8. A fusion device according to claim 7, wherein: a notch (23) is formed at the tip of the locking screw (2).

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