CN212521973U

CN212521973U - Rotatable double-end nail

Info

Publication number: CN212521973U
Application number: CN202020344711.1U
Authority: CN
Inventors: 许书富; 代亚男; 张勋; 甄超
Original assignee: TIANJIN JINXINGDA INDUSTRIAL CO LTD; Tianjin Zhengtian Medical Instrument Co Ltd
Current assignee: TIANJIN JINXINGDA INDUSTRIAL CO LTD; Tianjin Zhengtian Medical Instrument Co Ltd
Priority date: 2020-03-18
Filing date: 2020-03-18
Publication date: 2021-02-12
Anticipated expiration: 2030-03-18

Abstract

The utility model discloses a rotatable double-end nail belongs to medical instrument technical field, rotatable double-end nail includes the pedicle of vertebral arch screw, the pedicle of vertebral arch screw includes first screwhead and connects the nail body of first screwhead below, first screwhead has the first U type groove that is used for placing main connective bar, be provided with transverse connection portion on the pedicle of vertebral arch screw, transverse connection portion's end-to-end connection has rotatable lockable second screwhead, second screwhead has the second U type groove that is used for placing inferior connective bar. The utility model discloses in, the structure for be connected with the satellite rod is second screwhead, and the second screwhead adopts rotatable design, need not the radian of satellite rod of bending many times, and the second U type inslot at the second screwhead is placed with the satellite rod that can be easy behind the rotation regulation second screwhead direction, and this structure convenient operation can save operation time.

Description

Rotatable double-end nail

Technical Field

The utility model relates to the technical field of medical equipment, especially indicate a rotatable double-end nail.

Background

After the scoliosis orthopedic operation, particularly for obese patients, the probability of rod breakage within two years is about 4 percent. In order to prevent the titanium rod from being broken, a satellite rod is added in the periosteotomy area in the operation, and the method for increasing the strength of the spinal internal fixation system is a common method in the current operation.

The structure that is used for being connected with the satellite stick that each present firm produced all is fixed angle, and it is very inconvenient to put the stick, needs the radian of titanium stick of bending many times, just can place the stick in two U type inslots of fixed angle structure.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a need not satellite stick of bending many times, convenient operation's rotatable double-end nail.

In order to solve the technical problem, the utility model provides a technical scheme as follows:

the utility model provides a rotatable double-end nail, includes the pedicle of vertebral arch screw, the pedicle of vertebral arch screw includes first screwhead and connects the nail body of first screwhead below, first screwhead has the first U type groove that is used for placing main connective bar, be provided with transverse connection portion on the pedicle of vertebral arch screw, transverse connection portion's end-to-end connection has rotatable lockable second screwhead, second screwhead has the second U type groove that is used for placing the secondary connective bar.

Further, the first screw head and the screw body are of an integral structure;

or a vertical first through hole is formed in the lower portion of the first screw head, the screw body is a universal ball screw with a ball head, the ball head is clamped in the first through hole after the screw body penetrates through the first through hole, and a screw pressing gasket is arranged above the ball head in the first screw head.

Furthermore, an internal thread is arranged in the first U-shaped groove, and a first thread pressing nail used for fixing the main connecting rod is connected to the internal thread.

Further, the transverse connecting part and the lower end of the first screw head are of an integral structure.

Furthermore, the tail end of the transverse connecting portion is provided with a circular boss with an upward direction, a threaded hole is formed in the circular boss, a second through hole capable of being sleeved outside the circular boss is formed in the lower portion of the second screwhead, and a locking screw used for being installed in the threaded hole is arranged in the second screwhead.

Furthermore, the locking screw is T-shaped, and the diameter of the head of the locking screw is larger than that of the inner hole of the second through hole.

Further, the height of the locking screw is designed to be such that the tail of the locking screw does not exceed the bottom end of the transverse connecting portion when the locking screw is in a locking state.

Furthermore, the lower end surface of the second screw head and the surface of the transverse connecting part contacting with the lower end surface of the second screw head are both sawtooth-shaped interfaces or rough friction surfaces.

Furthermore, an outward-turned riveting edge structure is arranged on the upper edge of the circular boss.

Furthermore, an internal thread is arranged in the second U-shaped groove, and a second thread pressing nail used for fixing the secondary connecting rod is connected to the internal thread.

The utility model discloses following beneficial effect has:

the utility model discloses a rotatable double-end nail, its structure that is used for being connected with the satellite rod is the second screwhead, and the second screwhead adopts rotatable design, need not the radian of satellite rod of bending many times, and the second U type inslot at the second screwhead is placed with the satellite rod that can be easy behind the rotation regulation second screwhead direction, and this structure convenient operation can save operation time.

Drawings

FIG. 1 is a schematic view of the overall structure of the rotatable double-headed nail of the present invention;

FIG. 2 is a schematic cross-sectional view of the double-headed nail of FIG. 1 at the second screw head;

FIG. 3 is a schematic view of a contact interface between a second screw head and a transverse connection according to the present invention;

FIG. 4 is a schematic view of an alternative contact interface between the second screw head and the transverse connection of the present invention;

fig. 5 is a schematic view of another structural form of the circular boss on the middle transverse connecting portion of the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.

The utility model provides a rotatable double-end nail, as shown in fig. 1-2, including pedicle screw 1, wherein:

the pedicle screw 1 comprises a first screw head 11 and a screw body 12 connected below the first screw head 11, the first screw head 11 is provided with a first U-shaped groove 111 for placing a main connecting rod (usually a long rod, not shown);

the pedicle screw 1 is provided with a transverse connection 13, the end of the transverse connection 13 is connected with a second screw head 14 which can be locked in a rotating way, and the second screw head 14 is provided with a second U-shaped groove 141 for placing a secondary connecting rod 2 (usually a short rod serving as a satellite rod).

The utility model discloses a rotatable double-end nail, its structure that is used for being connected with the satellite rod is the second screwhead, and the second screwhead adopts rotatable design, need not the radian of satellite rod of bending many times, and the second U type inslot at the second screwhead is placed with the satellite rod that can be easy behind the rotation regulation second screwhead direction, and this structure convenient operation can save operation time. The utility model is suitable for a backbone internal fixation operation that the backbone lateral bending perhaps need use the satellite stick firm fixed.

Pedicle screw 1 can adopt various structural style among the prior art, all do not influence the implementation of this application technical scheme, for example first screwhead and the nail body can be the integrative structure of unadjustable direction, and nevertheless for facilitate the use, first screwhead and the nail body are preferably the universal adjustable form of components of a whole that can function independently, promptly: as shown in fig. 1, a vertical first through hole 112 is provided at a lower portion of the first screw head 11, the nail body 12 is a universal ball nail having a ball head (a spherical head, not shown), the ball head is clamped in the first through hole 112 after the nail body 12 passes through the first through hole 112, and a nail pressing washer 113 is provided above the ball head in the first screw head 11.

Further, in order to facilitate fixing of the connecting rod, an internal thread may be provided in the first U-shaped groove 111, and a first thread pressing nail (not shown) for fixing the main connecting rod is connected to the internal thread, so that, after the direction/angle of the first screw head 11 in fig. 1 is adjusted to a proper position, the main connecting rod may be placed in the first U-shaped groove 111, and then the first thread pressing nail is screwed in, and the main connecting rod may be fixed in the first U-shaped groove 111, and meanwhile, since the main connecting rod is stressed, the pressure may be transmitted to the ball head of the screw body 12 through the pressing nail washer 113, thereby also achieving locking between the universal ball nail and the universal screw head (i.e., the first screw head 11).

It is conceivable that one end of the transverse connecting portion 13 connected with the pedicle screw 1 may be connected to the nail body 12, or connected to the first screw head 11, and when connected to the nail body 12, the end of the transverse connecting portion 13 may be annularly sleeved on the nail body 12; considering that the end of the transverse connecting portion 13 is preferably fixed with the pedicle screw 1, for convenience, the transverse connecting portion 13 is preferably integrally formed with the lower end of the first screw head 11, i.e., as shown in fig. 1, the transverse connecting portion 13 may extend transversely from the lower end of the first screw head 11, and the transverse connecting portion 13 may be a plate-like structure.

In the present invention, the rotatable and lockable second screw head 14 can be easily realized by those skilled in the art, and preferably adopts the following structure:

as shown in fig. 2, the end of the transverse connecting portion 13 is provided with a circular boss 131 with an upward direction, a threaded hole 132 is formed in the circular boss 131, a second through hole 142 capable of being sleeved outside the circular boss 131 is formed in the lower portion of the second screw head 14, and a locking screw 143 for being installed in the threaded hole 132 is formed in the second screw head 14.

Thus, initially, the locking screw 143 is not completely locked, which can ensure the free rotation function of the second screw head 14, and during the operation, after the angle of the second screw head 14 is determined, the locking screw 143 can be locked by a tool, such as a hexagonal wrench, so that the angle of the second screw head 14 is fixed.

It should be noted that the locking screw 143 is preferably T-shaped and the diameter of the head is preferably larger than the diameter of the inner hole of the second through hole 142, so that the second screw head 14 is prevented from being removed from the circular boss 131. Also, the height of the locking screw 143 is preferably designed such that: the tail (i.e., lower) portion of the locking screw 143 does not extend beyond the bottom end of the transverse link 13 when the locking screw is in the locked position, thereby avoiding irritation of the surrounding soft tissue.

To further enhance the locking firmness of second screw head 14, the lower end surface of second screw head 14 and the surface of transverse connection portion 13 contacting with the lower end surface of second screw head 14 may be both serrated interface 15 (fig. 3) or rough friction surface 16 (interface with larger friction coefficient, fig. 4) to facilitate the locking of second screw head 14 and ensure the strong fixation of the spine after operation. As shown in fig. 5, the upper edge of the circular boss 131 of the transverse connecting portion 13 is preferably provided with an outwardly turned caulking structure 133, which further ensures that the second screw head 14 does not come off the circular boss 131.

To facilitate the fixing of the connecting rod by the second screw head 14, the same structure as that of the first screw head 11 can be adopted in the second screw head 14, namely: the second U-shaped groove 141 is internally provided with an internal thread, and a second thread pressing nail 144 for fixing the secondary connecting rod 2 is connected to the internal thread.

To sum up, the rotatable double-headed nail shown in the figures of the utility model has one end provided with a universal screw head which is matched with a universal ball nail for use, and the screw head at the other end can also rotate for 360 degrees; then the rod is placed and locked by a thread pressing nail to finish the operation. The utility model provides a rod can conveniently be put to the structure at arbitrary angle, reduces the curved stick number of times of titanium stick, guarantees the life of titanium stick.

The utility model is suitable for a backbone internal fixation operation, its key feature is that the structure (second screwhead promptly) that is used for connecting the satellite stick can rotate 360 degrees angles, can pass through locking screw at arbitrary angle and lock revolution mechanic, later put into the satellite stick after can through the screw thread pressure nail locking satellite stick, avoid the titanium stick of bending many times in the art, save the operation time.

The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a rotatable double-end nail, includes the pedicle of vertebral arch screw, the pedicle of vertebral arch screw includes first screwhead and connects the nail body below the first screwhead, first screwhead has the first U type groove that is used for placing the main connective bar, its characterized in that, be provided with transverse connection portion on the pedicle of vertebral arch screw, the end-to-end connection of transverse connection portion has rotatable lockable second screwhead, second screwhead has the second U type groove that is used for placing the secondary connective bar.

2. The rotatable double-ended nail according to claim 1, wherein the first screw head and the nail body are a unitary structure;

3. The rotatable double headed nail of claim 2 wherein the first U-shaped channel has internal threads therein to which are attached first threaded hold down nails for securing the primary connecting rods.

4. The rotatable double-headed nail according to claim 1 wherein the transverse connection is of unitary construction with the lower end of the first screw head.

5. The rotatable double-headed nail according to any one of claims 1-4, wherein the end of the transverse connecting part is provided with a circular boss with an upward direction, a threaded hole is formed in the circular boss, the lower part of the second screw head is provided with a second through hole capable of being sleeved outside the circular boss, and a locking screw for being installed in the threaded hole is arranged in the second screw head.

6. The rotatable double-headed nail according to claim 5 wherein the locking screw is T-shaped and has a head diameter greater than the inner bore diameter of the second through-hole.

7. The rotatable double-headed nail according to claim 5, wherein the locking screw has a height such that a tail portion thereof does not exceed a bottom end of the transverse connecting portion when the locking screw is in the locked state.

8. The rotatable double-headed screw according to claim 5, wherein the lower end surface of the second screw head and the surface of the transverse connection portion in contact with the lower end surface of the second screw head are both serrated interfaces or rough friction surfaces.

9. The rotatable double-headed nail according to claim 5 wherein the upper edge of the circular boss is provided with an everted clinching structure.

10. The rotatable double headed nail of claim 5 wherein the second U-shaped groove is internally provided with an internal thread to which a second threaded fastener for securing a secondary connecting rod is attached.