CN117770933A - Bone screw implantation system - Google Patents

Abstract

The invention discloses a bone screw implantation system, comprising: bone nails and nail holders; the bone nail comprises a front threaded section and a rear nail cap, wherein a clamping groove is formed in the nail cap, and a groove is coaxially formed in the center of the nail cap; the nail holder comprises a handle, a connecting rod, a round table and a fixed shaft which are sequentially and coaxially connected, wherein one end face of the round table is provided with a clamping claw, the fixed shaft is matched with the groove during surgical implantation, and the clamping claw is matched with and clamped and fixed by the clamping groove. The bone screw implanting system can keep the stable state of holding the bone screw in the axial direction of the bone screw, improves the implanting efficiency, has a simple structure, and is easy to withdraw from the screw holder after the bone screw is implanted.

Description

Bone screw implantation system

Technical Field

The invention belongs to the field of medical appliances, and particularly relates to a bone screw implantation system.

Background

Bone nails are a common type of orthopedic implant that are used in surgery to fix damaged bone tissue or other orthopedic internal fixation structures such as rigid plates. When bone nails are implanted into bone tissue in bone surgery, the bone nails often need to be matched with a nail holder. The main functions of the nail holder are as follows: 1) The bone nails are stably held, so that operators can safely and accurately place the bone nails at the positions needing to be fixed or implanted; 2) The axis of the bone screw is kept anastomotic during the whole operation process, and the advancing direction of the bone screw is controlled.

The existing widely used bone screw holding modes are clamping type or outer sleeve type, and the holding devices used in the two holding modes have certain limitations, so that a plurality of inconveniences are brought to the operation. The outer sleeve type extractor has more parts, so that the extractor is excessively complicated and bulky, and the view of an operator is blocked when an operation incision is smaller or a tiny bone nail is held, so that the operation of the operator is inconvenient. The clamping type gripper is difficult to provide a holding force on the bone nail, particularly in the axial direction of the bone nail, is unstable during operation, and the bone nail is easy to fall off during use; moreover, the implant is not easy to take out after implantation, and cannot be used for minimally invasive surgery.

Therefore, in order to overcome the shortcomings in the prior art, the bone screw implantation system with stable screw holding state, easy taking out and simple structure is provided, which is a technical problem to be solved by the person skilled in the art.

Disclosure of Invention

The invention provides a bone screw implanting system which can keep the stable state of holding the bone screw in the axial direction of the bone screw, improves the implanting efficiency, has a simple structure and is easy to withdraw from a screw holder after the bone screw is implanted.

In order to solve the technical problems, the technical scheme provided by the invention is as follows: a bone screw implant system comprising: bone nails and nail holders; the bone nail comprises a front threaded section and a rear nail cap, wherein a clamping groove is formed in the nail cap, and a groove is coaxially formed in the center of the nail cap; the nail holder comprises a handle, a connecting rod, a round table and a fixed shaft which are sequentially and coaxially connected, wherein one end face of the round table is provided with a clamping claw, the fixed shaft is matched with the groove during surgical implantation, and the clamping claw is matched with and clamped and fixed by the clamping groove.

Further, the clamping grooves are side wall open grooves which are uniformly distributed on the edge of the nut.

Further, the clamping grooves are uniformly distributed on the end face of the nut.

Further, the clamping claw is perpendicular to the end face of the round table.

Further, the clamping groove and the clamping claw are uniformly provided with three or four.

Further, the groove extends toward the thread segments.

Further, the fixed shaft and the groove are both cylindrical or polygonal.

Further, the clamping groove is in interference fit with the clamping claw.

Further, the inner wall of the groove and the outer wall of the fixed shaft are rough surfaces; the contact surfaces of the clamping grooves and the clamping claws are rough surfaces.

Further, the length of the groove is consistent with the length of the bone screw.

The invention has the beneficial effects that: the implantation system realizes double fixation of the bone nail through the fixed shaft and the clamping claw, the fixation is firm, and the coaxial fixed shaft is deep into the bone nail, so that the bone nail and the nail holder are not offset in the axial direction; the clamping claw and the clamping groove are propped against each other to ensure that the bone nail can be synchronously driven to rotate in the rotating process of the nail holder, and the round table and the bone nail are prevented from slipping in the circumferential rotating process; the bone nail can easily withdraw from the nail holder after implantation, the operation is simple and convenient, the operation quality is effectively ensured, and the operation efficiency is improved; can be used for minimally invasive surgery, and has unlimited application range; the system also has the characteristics of small volume, simple operation and convenient use.

Drawings

Fig. 1 is a front view of a bone screw according to a first embodiment of the present invention;

fig. 2 is a top view of a bone screw according to a first embodiment of the present invention;

FIG. 3 is a front view of the staple holder of the first embodiment of the present invention;

FIG. 4 is a bottom view of the staple holder of the first embodiment of the present invention;

FIG. 5 is a front view of a bone screw and staple holder assembly according to a first embodiment of the present invention;

fig. 6 is a front view of a bone screw according to a second embodiment of the present invention;

fig. 7 is a top view of a bone screw according to a second embodiment of the present invention;

fig. 8 is a top view of a bone screw according to another preferred embodiment of the second embodiment of the present invention;

fig. 9 is a top view of a bone screw according to yet another preferred embodiment of the second embodiment of the present invention;

fig. 10 is a top view of a bone screw according to yet another preferred embodiment of the second embodiment of the present invention;

FIG. 11 is a top view of a bone screw according to yet another preferred embodiment of the second embodiment of the present invention;

FIG. 12 is a front view of a staple holder of a second embodiment of the present invention;

fig. 13 is a front view of the first embodiment of the present invention with the bone screw engaged with the staple holder.

The reference numerals include:

100-bone screw 110-nut 120-thread section

111-groove 112-clamping groove 200-nail holder

210-handle 220-connecting rod 230-round table

240-fixed shaft 231-gripper jaw

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing and simplifying the description based on the orientation or positional relationship shown in the drawings, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

The present invention provides a bone screw implant system, as shown in fig. 5 and 13, which basically comprises a bone screw 100 and a screw holder 200. As shown in fig. 1, 2, 6 and 7, the bone screw 100 includes a front threaded section 120 and a rear nut 110. The screw thread section 120 is circumferentially provided with external screw threads, the end face of the nut 110 is circular, the nut 110 is provided with a clamping groove 112, and the center of the end face of the nut 110 is coaxially provided with a groove 111. As shown in fig. 3 and 4, the nail holder 200 comprises a handle 210, a connecting rod 220, a circular table 230 and a fixing shaft 240 which are coaxially connected in this order, wherein the circular table 230 has a diameter larger than that of the connecting rod 220 and the fixing shaft 240 connected thereto, and a grip jaw 231 is provided at one end surface of the circular table 230. As shown in fig. 5, when the staple holder 200 is mated with the bone staple 100, the fixed shaft 240 extends into the recess 111 of the bone staple 100 and is shaped and sized to mate therewith, at which point the clamping jaw 231 is configured to extend into the clamping slot 112 to matingly lock therewith, clamping the bone staple 100 in place.

In the first embodiment of the present invention, as shown in fig. 1-7, the clamping groove 112 is disposed at the edge of the nail cap 110, and the clamping groove 112 is a groove with an open side, and correspondingly, the clamping claw 231 is disposed at the edge of the end surface of the round table 230, and when the two are matched, the clamping claw 231 will clamp and fix the bone nail 100.

In a preferred embodiment, the number of clamping claws 231 and clamping slots 112 is 3 or 4, and are evenly distributed along the circumference; the fixed shaft 240 has a cylindrical or polygonal column shape, and the recess 111 has a cylindrical or polygonal column shape to be matched therewith accordingly to ensure that the two can be matched.

As shown in fig. 1, the length of the groove 111 may extend to the threaded section 120, or the length of the groove 111 may extend to the same length as the bone screw 100 (i.e., the bone screw 100 is a hollow structure). This arrangement ensures that the axial direction of the bone screw 100 is more stable when the bone screw is clamped and fixed during implantation, and the bone screw is not easily deviated.

In order to increase the clamping force of the nail holder 200 on the bone nail 100, as shown in fig. 3, the clamping claws 231 are disposed at the edge of the lower surface of the circular table 230 and perpendicular to the end surface of the circular table 230, and the distance between the inner walls of the plurality of clamping claws 231 and the central axis of the nail holder 200 is slightly smaller than the distance between the inner walls of the clamping grooves 112 and the central axis of the bone nail 100, so as to ensure that the clamping grooves 112 and the clamping claws 231 can clamp the bone nail 100 in an interference fit.

In order to prevent the nail holder 200 from slipping with the bone nail 100 during clamping, the contact surfaces of the clamping jaw 231 and the clamping groove 112 are both roughened, as are the outer surface of the stationary shaft 240 and the inner wall of the recess 111.

The present invention also provides a second embodiment, which has a structure substantially the same as that of the first embodiment, except that, as shown in fig. 6 to 8 and 12, a clamping groove 112 is provided at an end face of the nut 110, a clamping jaw 231 is provided at an end face side of the circular table 230, the shape and size of the clamping groove 112 are matched with those of the clamping jaw 231, and the clamping jaw 231 is matched inside the clamping groove 112 when the two are matched with each other. The same effect of fixation and rotational screwing is achieved with this embodiment as well when screwing in bone screw 100.

In this embodiment, as shown in fig. 7 to 11, the clamping grooves 112 may be uniformly provided with 2, 3, 4, 5 or 6 clamping claws 231, and the same number is provided. The number of the holding grooves 112 and the holding claws 231 is not specifically limited in the present application, and any structure capable of achieving the fixing and holding effects is within the scope of the present application.

The using method of the bone screw implantation system comprises the following steps: the operator holds the bone nail 100 and the nail holder 200, inserts the front end fixing shaft 240 of the nail holder 200 into the groove 111 of the rear end of the bone nail 100, and simultaneously, matches the clamping jaw 231 into the clamping groove 112 to fix the bone nail 100; the staple holder 200 is then rotated, and the bone staple 100 is rotated into the bone tunnel by the force applied to the staple by the clamping jaw 231. Also, due to the cooperation of the fixing shaft 240 and the groove 111, the bone screw 100 is not offset in the axial direction during the screwing process. After the bone screw 100 and the bone tissue are firmly connected together, and the clamping jaw 231 on the screw holder 200 and the clamping groove 112 on the bone screw 100 are kept in relative position only through interference fit, so that the screw holder 200 can be pulled out only by slightly exerting force, the operation is very simple and convenient, and the bone screw can be applied to minimally invasive surgery.

The foregoing is merely exemplary of the present invention, and many variations may be made in the specific embodiments and application scope of the invention by those skilled in the art based on the spirit of the invention, as long as the variations do not depart from the gist of the invention.

Claims (10)

1. A bone screw implant system, comprising: bone nails and nail holders; the bone nail comprises a front threaded section and a rear nail cap, wherein a clamping groove is formed in the nail cap, and a groove is coaxially formed in the center of the nail cap; the nail holder comprises a handle, a connecting rod, a round table and a fixed shaft which are sequentially and coaxially connected, wherein one end face of the round table is provided with a clamping claw, the fixed shaft is matched with the groove during surgical implantation, and the clamping claw is matched with and clamped and fixed by the clamping groove.

2. The bone screw implant system of claim 1, wherein the clamping grooves are sidewall open grooves evenly distributed over the edge of the nut.

3. The bone screw implant system of claim 1, wherein the clamping grooves are evenly distributed on an end surface of the nut.

4. A bone screw implant system according to claim 2 or 3, wherein the clamping jaw is arranged perpendicular to the end face of the table.

5. The bone screw implant system of claim 4, wherein the clamping groove and the clamping jaw are each uniformly provided with two, three, or four.

6. The bone screw implant system of claim 5, wherein the recess extends toward the threaded section.

7. The bone screw implant system of claim 6, wherein the stationary shaft and the recess are each cylindrical or polygonal.

8. The bone screw implant system of claim 7, wherein the clamping groove is an interference fit with the clamping jaw.

9. The bone screw implant system of claim 6, wherein the recess inner wall and the stationary shaft outer wall are roughened surfaces; the contact surfaces of the clamping grooves and the clamping claws are rough surfaces.

10. The bone screw implant system of claim 4, wherein the length of the recess corresponds to the length of the bone screw.