CN215458523U

CN215458523U - Detachable screw and internal fixing device for fixing front ring of pelvic fracture

Info

Publication number: CN215458523U
Application number: CN202121919291.6U
Authority: CN
Inventors: 梁永辉; 苗志明; 张立海; 顾锋; 韦兴; 冯丽丽
Original assignee: Aerospace Center Hospital
Current assignee: Aerospace Center Hospital
Priority date: 2021-08-16
Filing date: 2021-08-16
Publication date: 2022-01-11
Anticipated expiration: 2031-08-16

Abstract

The utility model provides a detachable screw for fixing a pelvis fracture front ring and an internal fixing device, wherein the detachable screw for fixing the pelvis fracture front ring comprises: the main nail, the first hoop sheet and the second hoop sheet; the first hoop sheet and the second hoop sheet are detachably connected, and the first hoop sheet and the second hoop sheet are connected to form a nail barrel; the main nail is connected in the nail barrel, and the front end of the main nail extends out of the nail barrel. The internal fixing device comprises a connecting cross rod and at least two detachable fixed screws for the pelvis fracture front ring; the detachable screws for fixing the front ring of the pelvic fracture are connected through a connecting cross rod. The utility model solves the problem that the rest part outside the main screw of the screw is difficult to take out for the patient with the internal fixing frame in the prior art. The utility model can take out the rest parts of the pelvis fracture front ring fixing detachable screws when the main screw is inconvenient to take out, thereby reducing the discomfort of a patient after the operation.

Description

Detachable screw and internal fixing device for fixing front ring of pelvic fracture

Technical Field

The utility model relates to the technical field of orthopedic medical instruments, in particular to a detachable screw and an internal fixing device for fixing a pelvis fracture front ring.

Background

For senile fragile Anterior Pelvic Ring injury, currently, a Minimally Invasive percutaneous Anterior Pelvic Internal fixation (Minimally Invasive Anterior Pelvic Internal Ring Internal fixer) is generally adopted clinically. The most widely used and effective instrument in this procedure is called an internal fixation frame (INFIX). The internal fixing frame is designed primarily to stabilize the anterior pelvic ring, so that injury of the anterior pelvic ring, including pubic symphysis and pubic ramus fracture, is the best indication. Because the internal fixation frame is located abdomen pelvis the place ahead, subjective uncomfortable sense can appear in the patient of size emaciation, especially to sitting up the position, and the postoperative usually appears subjective uncomfortable sense and influences daily life, but should discomfortable sense disappear promptly after taking out the internal fixation frame. Therefore, after the fracture heals, the internal fixation frame should be removed by a secondary operation.

At present, a main nail of an internal fixing frame and a nail cap of a connecting cross rod are designed integrally, but the main nail needs to be kept in place for a long time for some special fractures, and the cross rod causes discomfort and needs to be taken out early. However, in the early stage after the pelvic anterior ring injury recovery operation, the degree of pelvic recovery is insufficient, and the screw is not easily removed except for the main nail.

Aiming at the problem that the rest part of the screw main nail is difficult to take out for a patient who installs the internal fixing frame in the prior art, an effective solution is not provided.

SUMMERY OF THE UTILITY MODEL

In view of this, the present embodiment provides a detachable screw for fixing an anterior ring of pelvic fracture and an internal fixation device, so as to solve the problem that it is difficult to remove the remaining portion of the screw main nail for a patient who is installed with an internal fixation frame in the prior art.

For this reason, the present embodiment provides the following technical solutions:

in a first aspect of the present invention, there is provided a detachable screw for fixing an anterior ring of a pelvic fracture, comprising: the main nail, the first hoop sheet and the second hoop sheet;

the first hoop sheet and the second hoop sheet are detachably connected, and the first hoop sheet and the second hoop sheet are connected to form a nail barrel; the main nail is connected in the nail barrel, and the front end of the main nail extends out of the nail barrel.

Optionally, the detachable screw for fixing the anterior ring of pelvic fracture further comprises:

the first hoop sheet and the second hoop sheet are connected through an external nut to form a nail barrel;

the outer sides of the first hoop sheet and the second hoop sheet are provided with first threads matched with the outer nut;

the outer nut is meshed with the first threads to fix the first hoop sheet and the second hoop sheet to form the nail barrel.

the main nail comprises a screw rod and a screw head;

the screw head is of a spherical structure and is connected with the nail barrel to form a universal joint;

the screw is provided with second threads with various screw pitches;

the screw rod and the screw head are connected to form the main nail, or the screw rod and the screw head are integrally formed into the main nail.

a cavity is arranged in the screw rod; the side wall of the screw at the position of the cavity is provided with a through hole, and the axis of the through hole is perpendicular to the axis of the screw.

In a second aspect of the utility model, there is provided an internal fixation device comprising a connecting cross-bar and at least two detachable screws for anterior ring fixation of pelvic fractures according to any one of the first aspect; the detachable fixed screws of the pelvis fracture front ring are connected through the connecting cross rod.

Optionally, the ends of the first hoop sheet and the second hoop sheet, which are far away from the main nail, are provided with half clamping grooves; the first hoop piece and the second hoop piece are connected to splice the half clamping grooves into clamping grooves, and the clamping grooves are matched with the connecting cross rods.

Optionally, the internal fixation device further comprises an internal screw; third threads are arranged on the inner walls of the first hoop sheet and the second hoop sheet; the inner screw is connected with the screw barrel through the third thread, and the connecting cross rod is pressed between the inner screw and the screw head of the main screw.

Optionally, the detachable screw and internal fixation device for fixing the anterior ring of pelvic fracture further comprises: and a clamp spring is arranged between the connecting cross rod and the main nail.

The technical scheme of the embodiment has the following advantages:

the embodiment provides a fixed screw and internal fixation device dismantled of pelvis fracture anterior ring, has solved among the prior art to the patient who has installed the internal fixation frame through this embodiment, is difficult to take out the problem of the outer remaining part of screw main nail. The embodiment can be used for taking out the rest parts of the fixed detachable screws of the front ring of the pelvic fracture when the main nail is not convenient to take out, thereby reducing the discomfort of the patient after the operation.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic view of a detachable screw structure for fixing an anterior ring for pelvic fracture according to the present embodiment;

FIG. 2 is a schematic structural view of a main nail according to the present embodiment;

FIG. 3 is a schematic structural view of an internal fixation device according to the present embodiment;

FIG. 4 is a schematic view showing a structure in which an internal fixation device according to the present embodiment is installed at a fracture site;

fig. 5 is a schematic structural diagram of the circlip according to the embodiment.

Detailed Description

The technical solutions in the embodiments will be described clearly and completely with reference to the drawings in the embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present disclosure, the word "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the utility model. In the following description, details are set forth for the purpose of explanation. It will be apparent to one of ordinary skill in the art that the present invention may be practiced without these specific details. In other instances, well-known structures and processes are not shown in detail to avoid obscuring the description of the utility model with unnecessary detail. Thus, the present invention is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

In this embodiment, a detachable screw and an internal fixation device for fixing an anterior ring of a pelvic fracture are provided, which can be used for post-operation fixation of an injury of the anterior ring of the pelvic fracture, for example, post-operation fixation of pubic ramus fracture, and fig. 1 is a schematic structural view of the detachable screw for fixing the anterior ring of the pelvic fracture according to this embodiment, as shown in fig. 1, the detachable screw for fixing the anterior ring of the pelvic fracture comprises: a main nail 101, a first strap 102 and a second strap 103. The first hoop sheet 102 and the second hoop sheet 103 are detachably connected, and the first hoop sheet 102 and the second hoop sheet 103 are connected to form a nail barrel. Specifically, the first hoop sheet 102 and the second hoop sheet 103 are detachably connected to form the nail barrel, so that the nail barrel can be restored to the first hoop sheet 102 and the second hoop sheet 103 by some methods, and the first hoop sheet 102 and the second hoop sheet 103 can be conveniently taken out.

The main nail 101 is attached within the cartridge, with the front end of the main nail 101 extending out of the cartridge. In particular, the primary staple 101 is attached to the cartridge to form a screw, and the end of the primary staple 101 extending out of the cartridge may be pointed to facilitate entry into the patient's bone. Meanwhile, the joint of the nail barrel and the main nail 101 is provided with an anti-disengagement groove, so that the main nail 101 can be fixed in the anti-disengagement groove, the main nail 101 is prevented from disengaging from the nail barrel, and the main nail 101 can be separated from the nail barrel by disassembling the nail barrel. In addition, one end of the main nail 101 connected with the nail barrel may be a sphere, and a cross or a straight groove is provided on the sphere for rotating the main nail 101. Those skilled in the art will appreciate that the shape of the end of the primary staple 101 attached to the cartridge and the size and shape of the groove formed in the end of the primary staple 101 attached to the cartridge are not intended to limit the scope of the present invention, and that other shapes of the end of the primary staple 101 attached to the cartridge and the size and shape of the groove formed in the end of the primary staple 101 attached to the cartridge are within the scope of the present invention.

The prior art screws do not have a detachable function, and the main nail 101 and the cartridge are of an integrated design and cannot be used for some types of fractures. In the present embodiment, unlike the prior art, which designs a detachable screw for fixing an anterior ring of a pelvic fracture, the other part of the screw can be removed while the main nail 101 is kept. This embodiment has been solved among the prior art to the patient of having installed the internal fixation frame, is difficult to take out the problem of the outer remaining part of screw main nail 101, and then has reduced the uncomfortable sense of patient's postoperative.

To illustrate the cartridge, in some alternative embodiments, the first and

second tag pieces

102 and 103 are connected by an external nut 104 to form the cartridge. The outer sides of the first and

second band pieces

102 and 103 are provided with first threads matching the outer nut 104. The external nut 104 is engaged with the first thread to fix the first hoop sheet 102 and the second hoop sheet 103, so as to form the nail barrel. Specifically, the first hoop sheet 102 and the second hoop sheet 103 are connected together through the external nut 104 to form the nail barrel, and the external nut 104 is fixed through meshing with the threads, so that the nut is rotated from the threads during disassembly, the operation is simple and rapid, and the disassembly is easy. While the outer nut 104 is engaged with or disengaged from the screw thread in the screw extending direction. It will be appreciated by those skilled in the art that the manner in which the first strap 102 and the second strap 103 are connected by a nut is not intended to limit the present invention, and that other ways of connecting that can form a removable cartridge are within the scope of the present invention.

To illustrate the main nail 101, in some alternative embodiments, as shown in fig. 2, the main nail 101 includes a threaded rod 201 and a threaded head 202. The screw head 202 is a spherical structure and is connected with the nail barrel to form a universal joint. Specifically, the lower part of the nail barrel is a spherical cavity, and when the nail barrel is connected with the main nail 101, the screw head 202 is arranged in the spherical cavity, so that the spherical cavity and the screw head 202 form a universal joint, and the screw can rotate for a certain angle in any direction.

The screw 201 is provided with second threads with various pitches. In particular, both coarse and fine threads may be included by the second thread. The screw can be quickly placed into the bone of a patient through the coarse threads, and then the screw is fixed on the bone of the patient through the fine threads, so that the screw is prevented from loosening and falling off due to factors such as vibration.

The screw 201 is connected with the screw head 202 to form the main nail 101, or the screw 201 and the screw head 202 are integrally formed into the main nail 101. Specifically, the main nail 101 may be formed by integrally forming a screw 201 and a screw head 202, or may be connected by a screw thread. Those skilled in the art will appreciate that the formation of the main nail 101 is not intended to limit the present invention, and other formation methods are within the scope of the present invention. For example, the screw head 202 is connected with the screw 201 by a snap or a mortise and tenon joint.

In some alternative embodiments, a cavity is provided within the screw 201; the side wall of the screw at the position of the cavity is provided with a through hole 203. A cavity is provided in the screw 201. The side wall of the screw at the position of the cavity is provided with a through hole 203. Specifically, bone cement may be placed into the cavity through the through-hole 203. Since the elderly usually suffer from osteoporosis, bone damage is usually severe when fractures occur. Through putting into bone cement in the screw, can promote the mechanical strength of screw, be favorable to the postoperative rehabilitation of fracture.

The present embodiment also provides an internal fixation device, as shown in fig. 3 and 4, comprising a connecting cross bar 301 and at least two detachable screws for fixing the anterior ring of pelvic fracture in the above-mentioned embodiments. The detachable screws for fixing the front ring of the pelvic fracture are connected through a connecting cross rod 301. In particular, a plurality of detachable fixed screws for fixing the front ring of the pelvis fracture are connected together by the connecting cross rod 301 to form an internal fixing device, which can well fix the fractured bone 401.

In some alternative embodiments, the ends of the first strap piece 102 and the second strap piece 103 away from the main nail 101 are both provided with half clamping grooves; the first hoop sheet 102 and the second hoop sheet 102 are connected to splice the half clamping grooves into clamping grooves, and the clamping grooves are matched with the connecting cross rod 301. Specifically, the connection of the connecting cross rod 301 and the nail barrel is facilitated by the clamping grooves arranged on the first hoop sheet 102 and the second hoop sheet 103, so that the connecting cross rod 301 can be connected with a plurality of detachable screws for fixing the anterior ring of the pelvic fracture. It will be appreciated by those skilled in the art that the use of a snap-in slot to attach the screw to the connecting rail 301 is not intended to limit the present invention and that other attachment means are within the scope of the present invention.

In some alternative embodiments, the internal fixation device further includes an internal screw 302. Third threads are arranged on the inner walls of the first hoop sheet 102 and the second hoop sheet 103. The inner screw 302 is connected with the screw barrel through a third thread, and the connecting cross rod 301 is compressed between the inner screw 302 and the screw head 202 of the main screw 101. Specifically, after the connecting cross bar 301 is placed in the clamping grooves of the first hoop sheet 102 and the second hoop sheet 103, the inner screw 302 is screwed into the nail barrel, and the connecting cross bar 301 is pressed in the corresponding nail barrel, so that the connecting cross bar 301 is prevented from falling off.

In some alternative embodiments, as shown in fig. 5, a snap spring 303 is provided between the connecting rail 301 and the main nail 101. Specifically, the clamp spring 303 is placed between the connecting cross rod 301 and the main nail 101, and the connecting cross rod 301 can be better fixed on the nail barrel due to the fact that the clamp spring 303 is provided with the groove matched with the connecting cross rod 301. Meanwhile, the clamp spring 303 can prevent the damage of devices in the detachable screw for fixing the pelvis fracture front ring when the inner screw 302 is screwed in and pressed.

Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the utility model, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A fixed screw of dismantling of ring before pelvis fracture which characterized in that includes: the main nail, the first hoop sheet and the second hoop sheet;

2. The detachable screw for anterior ring fixation of pelvic fracture according to claim 1, wherein the first hoop sheet and the second hoop sheet are connected by an external nut to form a nail barrel;

3. The detachable screw for anterior ring fixation of pelvic fracture according to claim 1, wherein the main screw comprises a screw rod and a screw head;

the screw is provided with second threads with various screw pitches;

4. The detachable screw for anterior ring fixation of pelvic fracture according to claim 3, wherein a cavity is provided in the screw rod; the side wall of the screw at the position of the cavity is provided with a through hole, and the axis of the through hole is perpendicular to the axis of the screw.

5. An internal fixation device comprising a connecting cross-bar and at least two detachable screws for anterior ring fixation of pelvic fractures according to any one of claims 1-4; the detachable fixed screws of the pelvis fracture front ring are connected through the connecting cross rod.

6. The internal fixation device as claimed in claim 5, wherein the ends of the first and second straps remote from the main nail are each provided with a half-catching groove; the first hoop piece and the second hoop piece are connected to splice the half clamping grooves into clamping grooves, and the clamping grooves are matched with the connecting cross rod.

7. The internal fixation device as recited in claim 6, further comprising an internal screw; third threads are arranged on the inner walls of the first hoop sheet and the second hoop sheet; the inner screw is connected with the screw barrel through the third thread, and the connecting cross rod is pressed between the inner screw and the screw head of the main screw.

8. An internal fixation device as claimed in any one of claims 5 to 7, wherein a circlip is provided between the connecting cross bar and the main nail.