WO2023202375A1 - Device for fixing animal spine - Google Patents

Abstract

The present utility model relates to the technical field of medical instruments. Disclosed is a device for fixing an animal spine. The device comprises a fixing screw, wherein the fixing screw comprises a screw head and a screw body for connecting a vertebral body, wherein the screw head and the screw body are circumferentially fixed, and the screw body comprises a base body and a tip end, wherein threads are unidirectionally and spirally arranged around the base body in a surrounding manner, the tip end is of a conical structure, a transition slope is arranged between the tip end and the threads, and the threads comprise a first spiral surface facing the tip end and a second spiral surface facing away from the tip end, the first spiral surface being inclined outwards in a direction away from the tip end, and an included angle between one end of the first spiral surface away from the base body and a vertical surface of the base body being greater than an included angle between one end of the second spiral surface away from the base body and the vertical surface of the base body. The device is simpler in overall shape and is thus smaller and more compact as a whole, and further, is higher in operational safety and lower in operational difficulty, and is more suitable for small animals compared with an existing product.

Description

Animal spinal immobilization device Technical field

The utility model relates to the technical field of medical devices, and in particular to an animal spine fixation device.

Background technique

In the existing spinal treatment process, spinal screw components are often used to fix and repair the spine. Among them, the spinal screw components usually include universal screws, fixed rods and locking screws. During the treatment process, the shaft of the universal screw passes through the vertebrae. The pedicle is implanted into the vertebral body, and the head of the universal screw is installed into the fixation rod and locked with a locking screw.

However, most of the existing spinal screw components are designed based on human treatment. For animal spinal treatment, especially small animals, on the one hand, the animal's vertebral pedicles are narrow and fragile, and it is easy to penetrate the cone foramen during implantation, causing spinal cord nerve damage. Injury, on the other hand, the animal's back muscles are thinner, and the complexity of the universal screw head makes the universal screw head too large, and its complexity also makes it difficult to directly reduce the profile size during treatment. It is very irritating to the muscles, and it is difficult to sew the fur.

Utility model content

The purpose of this utility model is to provide an animal spine fixation device with a simple and compact structure that is more suitable for small animals in view of the existing technical status.

In order to achieve the above purpose, the present utility model adopts the following technical solutions:

An animal spine fixation device includes a fixation nail. The fixation nail includes a nail head and a nail body for connecting the vertebral body. The nail head and the nail body are circumferentially fixed. The nail body includes a base body and a tip. A thread is spirally wound in one direction outside the base, and the tip has a tapered structure. A transition slope is provided between the tip and the thread. The thread includes a first helical surface facing the tip and a second helical surface facing away from the tip. , the first spiral surface tilts outward in the direction away from the tip, and the angle between the end of the first spiral surface away from the base and the vertical surface of the base is greater than the angle between the end of the second spiral surface away from the base and the vertical surface of the base the angle between them.

Preferably, the angle between the end of the second spiral surface away from the base and the vertical surface of the base is 0 to 4°, and the angle between the end of the first spiral surface away from the base and the vertical surface of the base is 36～40°.

Preferably, an arc chamfer is provided between the second spiral surface and the base body.

Preferably, the end of the base body close to the nail head is also provided with a stop rib, and there is a gap between the thread and the stop rib. Equipped with transitional cylinder.

Preferably, the nail head and the nail body are integrally formed.

Preferably, the fixing nail is made of TC4 titanium alloy or medical stainless steel, the outer diameter of the nail head is 5.0-11 mm, the height of the nail head is 5.0-11 mm, and the outer diameter of the nail body is more than 2.0 mm.

Preferably, the nail head is provided with a mounting groove, the bottom of the mounting groove is in an arc-shaped structure, and the side wall of the mounting groove is provided with a first through hole and a second through hole arranged in the same linear direction, A connecting rod is provided in the first through hole and the second through hole, a screw plug is pressed against the connecting rod, and the screw plug is connected to the installation groove.

Preferably, the side wall of the installation groove includes an introduction section and a thread section, the introduction section is provided at the opening of the installation groove, and the inner diameter of the introduction section narrows in a direction approaching the thread section.

Preferably, the first via hole and the second opening hole each have a U-shaped structure, and an introduction bevel is provided at the opening of the U-shaped structure, and the introduction bevel is inclined downward from outside to inside.

Preferably, one end of the screw plug is concavely provided with a polygonal groove, and the axis of the other end protrudes outward to form an abutment flange, and the abutment flange abuts against the connecting rod.

The beneficial effects of this utility model are:

The nail body of this utility model is only used for implantation into the connecting vertebral body, which can greatly reduce the risk of the fixed nail accidentally entering the tapered hole during implantation. At the same time, the nail body adopts the structural design of threads, tips and transition slopes. When used in animal vertebral body treatment, especially in small animal vertebral body treatment, the overall shape of the device is simpler, and the overall device can be made smaller and more compact. At the same time, the operation safety is higher and the operation difficulty is lower. Compared with Existing products are more suitable for smaller animals.

Description of the drawings

Figure 1 is a schematic structural diagram of the animal spine fixation device of the present invention.

Figure 2 is a schematic structural diagram of the fixing nail, connecting rod and screw plug.

Figure 3 is a schematic structural diagram of the fixing nail and screw plug.

Figure 4 is a schematic structural diagram of the connection between fixing nails, connecting rods and screw plugs.

Figure 5 is a schematic structural diagram of the fixing nail.

Figure 6 is a partial enlarged view of part A of Figure 5 .

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings and examples:

Please refer to Figures 1-3 and 5-6. The utility model discloses an animal spine fixation device, which includes a fixing nail 2. The fixing nail 2 includes a nail head 21 and a nail body 22 for connecting the vertebral body 11. , the nail head 21 and the nail body 22 are circumferentially fixed. The nail body 22 includes a base body and a tip. A thread 5 is spirally wound in one direction outside the base body. The tip has a tapered structure. There is a transition slope between the tip and the thread 5. The thread 5 It includes a first spiral surface 51 facing the tip and a second spiral surface 52 facing away from the tip. The first spiral surface 51 slopes outward in a direction away from the tip, and the first spiral surface 51 is away from one end of the base body and the vertical plane of the base body. The included angle between them (hereinafter referred to as the first included angle a) is greater than the included angle between the end of the second spiral surface 52 away from the base body and the vertical surface of the base body (hereinafter referred to as the second included angle b).

As shown in Figure 1, compared with the prior art, the shaft of the universal screw is used to pass through the vertebral pedicle 13 and then enter the vertebral body, the screw body 22 of the present utility model is only used to be implanted and connected to the vertebral body 11. During the operation, the fixing screw 2 is inserted into the vertebral body 11 and the lower side of the transverse process 12 and is directly implanted into the vertebral body 11 . Compared with the existing method of implanting the fixing screw 2 through the vertebral pedicle 13 . structure, the fixation nail 2 of the present utility model can greatly reduce the risk of the fixation nail 2 accidentally entering the cone hole during implantation. It is used in animal vertebral body treatment, especially in small animal vertebral body treatment, and is safe to operate. It is more reliable and less difficult to operate, and the overall device is more suitable for small animals.

Referring to Figure 6, on the other hand, the first helical surface 51 of the thread 5 on the nail body 22 of the present invention is configured such that the first helical surface 51 tilts outward in the direction away from the tip, and the first included angle a is much larger than the first helical surface 51. At the included angle b, when the thread 5 is screwed into the vertebral body, the first helical surface 51 can conform to the movement trend of the thread 5, with less resistance. The nail body 22 is easier to implant into the vertebral body 11, and it is safer to use. The operation is less difficult. The design combines the tip and the transition slope. When used, the tapered structure of the tip makes it easier to penetrate into the vertebral body 11. As the nail body 22 continues to be screwed in, the transition slope effectively ensures implantation. The nail body 22 of the vertebral body 11 smoothly transitions from the tip to the thread 5 without causing secondary damage to the animal's vertebral body. The fixing nail 2 of the present invention has a simple structure. While ensuring that the fixing nail 2 itself has a good installation effect, the device The overall size has also been reduced, making it more suitable for smaller animals.

By improving the fixing nail 2, the utility model makes the overall shape of the device simpler, and the whole device can be made smaller and more compact. At the same time, the operation safety is higher, the operation difficulty is lower, and it is more suitable than existing products. in small animals.

The angle between the end of the second spiral surface 52 away from the base and the vertical surface of the base is 0-4°, and the angle between the end of the first spiral surface 51 away from the base and the vertical surface of the base is 36-40°.

In one embodiment, the first included angle a is 38.9°, and the second included angle b is 0°, ensuring that the first spiral surface 51 There is an inclined surface that is steeper and has a larger area than the second spiral surface 52 .

Referring to Figure 6, in another embodiment, an arc chamfer 53 is provided between the second spiral surface 52 and the base body. At this time, the second included angle b is 3.1°, and the first included angle a is 38.9°. , to ensure the formation of the arc chamfer 53. The arc chamfer 53 can further increase the contact surface between the vertebral body and the nail body 22, so that the nail body 22 can have better contact with the vertebral body 11 when implanted, and improve the fixed connection effect. .

The end of the base body close to the nail head is also provided with a stop rib 54 , and a transition cylinder 55 is provided between the thread 5 and the stop rib 54 .

The stop rib 54 has a limiting effect to prevent the fixing nail 2 from being excessively screwed in.

Referring to Figure 3, the fixing nail 2 also includes a nail head 21. The nail head 21 and the nail body 22 are circumferentially fixed, that is, the nail head 21 and the nail body 22 are arranged in one direction. In a specific embodiment, the nail head 21 is fixed to the nail body 22. 21 and the nail body 22 are integrally formed. In another specific embodiment, the nail head 21 and the nail body 22 are connected with a thread 5. In this embodiment, it is preferred that the nail head 21 and the nail body 22 are integrally formed, thereby making the structure of the nail head 21 The setting is simpler than the traditional universal design, which can effectively reduce the size of the nail head 21, and the screw plug 4 and the connecting rod 3 can also be reduced in size simultaneously to avoid irritation to the back muscles due to the nail head 21 being too large. , and also reduces the stretching of the fur on the back.

The fixing nail 2 is made of TC4 titanium alloy or medical stainless steel. The outer diameter of the nail head 21 is 5.0-11 mm. The height of the nail head 21 is 5.0-11 mm. The outer diameter of the nail body 22 is more than 2.0 mm.

The length ratio between the nail head 21 and the nail body 22 is 1:1~1.35. The preferred length ratio between the nail head 21 and the nail body 22 is 3:4. Experiments have proved that within this length ratio, the fixing effect is the same as that of the nail head 21. Best overall performance between device sizes.

In the prior art, because the universal screw passes through the vertebral pedicle 13 and then enters the vertebral body 11, and is designed based on human vertebral column treatment, the shaft of the universal screw is much longer than the head, resulting in the overall size being too large.

In the present utility model, since the fixing nail 2 adopts the above-mentioned thread 5 structure, and the nail body 22 is directly implanted into the vertebral body 11 during use, the length of the nail body 22 can be correspondingly reduced to a length similar to the nail head, resulting in a more compact shape. , which can further improve the adaptability of the device to small animals while ensuring the fixing effect of the fixing nail 2.

Referring to Figures 2 and 4, the nail head 21 is provided with a mounting groove 215. The side wall of the mounting groove 215 is provided with a first through hole 211 and a second through hole 212 arranged in the same linear direction. The first through hole 211 There is a connecting rod 3 in the second through hole 212. A screw plug 4 is pressed against the connecting rod 3, and the screw plug 4 is connected to the mounting groove 215. The bottom of the mounting groove 215 has an arc-shaped structure, so that the connecting rod 3 The connection with the mounting groove 215 is tighter.

Referring to Figure 2, the side wall of the installation groove 215 includes an introduction section 213 and a thread section. The installation groove 215 passes through The threaded section is screwed to the screw plug 4. The introduction section 213 is located at the opening of the installation groove 215. The inner diameter of the introduction section 213 narrows in the direction close to the thread section. Since the diameter of the introduction section 213 is larger, it is the connecting rod 3 and the screw plug. The installation operation of 4 provides a larger operating space, thereby effectively ensuring that the device still has a large operating space after the overall size is reduced to accommodate small animals.

The first via hole 211 and the second opening respectively have a U-shaped structure, and an introduction bevel 214 is provided at the opening of the U-shaped structure. The introduction bevel 214 slopes downward from outside to inside, thereby enlarging the first via hole 211 and the second opening. The two openings further provide a larger operating space for the installation operation of the connecting rod 3 and the screw plug 4 .

Referring to FIGS. 2 and 3 , one end of the screw plug 4 is concavely provided with a polygonal groove, and the axis of the other end protrudes outward to form a resisting flange 91 , which resists the connecting rod 3 .

Of course, the above illustrations are only preferred embodiments of the present utility model and do not limit the scope of use of the present utility model. Therefore, any equivalent changes made to the principle of the present utility model should be included in the protection scope of the present utility model. .

Claims (10)

An animal spine fixation device, including a fixation nail, characterized in that the fixation nail includes a nail head and a nail body for connecting the vertebral body, the nail head and the nail body are circumferentially fixed, and the nail body includes a base body and a nail body. The tip is provided with a thread spirally wound in one direction outside the base. The tip has a tapered structure. A transition slope is provided between the tip and the thread. The thread includes a first spiral surface facing the tip and a first spiral surface facing away from the tip. The second helical surface, the first helical surface tilts outward in the direction away from the tip, and the angle between the end of the first helical surface away from the base body and the vertical surface of the base body is greater than the angle between the end of the second helical surface away from the base body and the vertical surface of the base body. The angle between vertical planes of a substrate. The animal spine fixation device according to claim 1, wherein the angle between the end of the second spiral surface away from the base body and the vertical surface of the base body is 0 to 4°, and the first spiral surface is away from the base body. The angle between one end and the vertical surface of the base body is 36 to 40°. The animal spine fixation device according to claim 2, characterized in that an arc chamfer is provided between the second spiral surface and the base body. The animal spine fixation device according to claim 2, wherein the end of the base body close to the nail head is further provided with a stop rib, and a transition cylinder is provided between the thread and the stop rib. The animal spinal fixation device according to claim 1, wherein the nail head and the nail body are integrally formed. The animal spine fixation device according to any one of claims 1 to 5, characterized in that the fixation nail is made of TC4 titanium alloy or medical stainless steel, the outer diameter of the nail head is 5.0-11 mm, and the height of the nail head is The diameter is 5.0-11mm, and the outer diameter of the nail body is more than 2.0mm. The animal spine fixation device according to any one of claims 1 to 5, wherein the nail head is provided with a mounting groove, the bottom of the mounting groove is in an arc-shaped structure, and the side wall of the mounting groove passes through A first via hole and a second via hole are provided along the same linear direction. A connecting rod is provided in the first via hole and the second via hole. A screw plug is pressed against the connecting rod, and the screw plug The plug is connected to the mounting slot. The animal spinal fixation device according to claim 7, wherein the side wall of the installation groove includes an introduction section and a threaded section, the introduction section is provided at the opening of the installation groove, and the inner diameter of the introduction section is adjacent to The direction of the thread section narrows. The animal spinal fixation device according to claim 7, wherein the first through hole and the second opening are each in a U-shaped structure, and the opening of the U-shaped structure is provided with an introduction bevel, and the The lead-in bevel slopes downward from outside to inside. The animal spinal fixation device according to claim 7, characterized in that one end of the screw plug is concave A polygonal groove is provided, and the axis center of the other end protrudes outward to form a resisting flange, and the resisting flange resists the connecting rod.