阅读说明：本技术 颈椎后路系统弹性连接棒 (Elastic connecting rod for cervical posterior system ) 是由 房志刚 贺军 于 2021-01-20 设计创作，主要内容包括：本发明涉及一种颈椎后路系统弹性连接棒,包括连接棒本体,其创新点在于：所述连接棒本体包括互为一体或固定连接的枕骨部位压制段和颈椎部位压制段,且枕骨部位压制段与颈椎部位压制段之间还设有应力释放弹性段,所述应力释放弹性段的外径均大于枕骨部位压制段和颈椎部位压制段。本发明能解决因连接棒受到局部弯曲所造成疲劳强度以及应力集中的断裂问题。(The invention relates to an elastic connecting rod of a cervical vertebra posterior system, which comprises a connecting rod body and is characterized in that: the connective bar body comprises an occipital bone part pressing section and a cervical vertebra part pressing section which are integrated or fixedly connected, a stress release elastic section is further arranged between the occipital bone part pressing section and the cervical vertebra part pressing section, and the outer diameter of the stress release elastic section is larger than the occipital bone part pressing section and the cervical vertebra part pressing section. The invention can solve the problem of fracture of fatigue strength and stress concentration caused by local bending of the connecting rod.)

1. The utility model provides a cervical vertebra way of escape system elastic connection stick, includes connective bar body (1), its characterized in that: the connecting rod body (1) comprises an occipital position pressing section (11) and a cervical vertebra position pressing section (12) which are integrated or fixedly connected, a stress release elastic section (13) is further arranged between the occipital position pressing section (11) and the cervical vertebra position pressing section (12), and the outer diameter of the stress release elastic section (13) is larger than the occipital position pressing section (11) and the cervical vertebra position pressing section (12).

2. The elastic connecting rod of a posterior cervical vertebra system according to claim 1, wherein: and an elastic groove (131) in a spiral spring shape is arranged on the peripheral wall of the stress release elastic section (13).

3. The elastic connecting rod of a posterior cervical vertebra system according to claim 1, wherein: the stress release elastic section (13) is provided with annular elastic grooves (132) which are uniformly arranged on the peripheral wall, and annular bulges (133) are arranged between the adjacent annular elastic grooves (132).

4. The elastic connecting rod of a posterior cervical vertebra system according to claim 2, wherein: the pitch P of the elastic groove (131) in the shape of the spiral spring is controlled within the range of 1 mm-2 mm, and the length L1 is controlled within the range of 10 mm-30 mm.

5. The elastic connecting rod of a posterior cervical vertebra system according to claim 3, wherein: the distance d between adjacent annular elastic grooves (132) is controlled within the range of 1 mm-2 mm, and the length L2 is controlled within the range of 10 mm-30 mm.

6. The elastic connecting rod of a posterior cervical vertebra system according to claim 1, wherein: the occipital bone pressing section (11) and the cervical vertebra pressing section (12) are both straight sections with smooth outer walls, and the stress release elastic section (13) is a straight section or an arc section.

7. The elastic connecting rod of a posterior cervical vertebra system according to claim 6, wherein: the radian of the stress release elastic section (13) is 100-150 degrees when the stress release elastic section is an arc-shaped section.

8. The elastic connecting rod of a posterior cervical vertebra system according to claim 1, wherein: the occipital bone part pressing section (11) is connected with one end of the stress release elastic section (13) into a whole through a first conical connecting section (14), and the cervical vertebra part pressing section (12) is connected with the other end of the stress release elastic section (13) into a whole through a second conical connecting section (15).

Technical Field

The invention relates to a connecting rod, in particular to an elastic connecting rod for a posterior cervical vertebra system.

Background

At present, in an occipital neck fusion operation, an occipital plate is implanted at the occipital bone part of the back brain, then the occipital plate is fixed at the occipital bone part of the back brain by using occipital screws, and two ends of the occipital plate are assembled with corresponding connecting seats for fixing connecting rods. Implant corresponding pedicle screw on the cervical vertebra centrum, even constitute occipital neck way of escape system as an organic whole with the connecting seat of occipital plate and the pedicle screw on the cervical vertebra centrum through the titanium alloy connective bar at last, still need to be crooked the connective bar in order to be suitable for the physiological curvature of occipital neck way of escape at this in-process, the connective bar is crooked in the atlas of first section of cervical vertebra and the intersection vertebra department of second section promptly, because the activity degree of postoperative patient neck portion, the connective bar condition that fatigue fracture takes place at the bending part often can take place, this just causes the patient and needs the secondary operation, bring very big misery and wound for the patient. The reason is that the fatigue strength of the connecting rod is greatly weakened due to the residual stress of the bent connecting rod and the movement of the head of the patient after the fixing, and in order to overcome the defect, the connecting rod made of cobalt chromium molybdenum material with higher hardness and higher strength is often adopted in clinic to solve the problem, but the problem of relatively high product cost exists.

Disclosure of Invention

The purpose of the invention is: provided is a connector rod capable of solving the problem of fracture due to fatigue strength and stress concentration caused by local bending of the connector rod.

In order to achieve the purpose, the technical scheme of the invention is as follows: the utility model provides a cervical vertebra way of escape system elastic connection stick, includes the connective bar body, its innovation point lies in: the connective bar body comprises an occipital bone part pressing section and a cervical vertebra part pressing section which are integrated or fixedly connected, a stress release elastic section is further arranged between the occipital bone part pressing section and the cervical vertebra part pressing section, and the outer diameter of the stress release elastic section is larger than the occipital bone part pressing section and the cervical vertebra part pressing section.

In the above technical scheme, the peripheral wall of the stress release elastic section is provided with an elastic groove in the shape of a spiral spring.

In the technical scheme, the peripheral wall of the stress release elastic section is provided with uniformly arranged annular elastic grooves, and an annular bulge is arranged between every two adjacent annular elastic grooves.

In the technical scheme, the pitch P of the elastic groove in the shape of the spiral spring is controlled within the range of 1 mm-2 mm, and the length L1 is controlled within the range of 10 mm-30 mm.

In the technical scheme, the distance d between the adjacent annular elastic grooves is controlled within the range of 1 mm-2 mm, and the length L2 is controlled within the range of 10 mm-30 mm.

In the above technical scheme, the occipital bone pressing section and the cervical vertebra pressing section are both straight sections with smooth outer walls, and the stress release elastic section is a straight section or an arc-shaped section.

In the technical scheme, the radian of the stress release elastic section is 100-150 degrees when the stress release elastic section is an arc-shaped section.

In the above technical scheme, the occipital bone part pressing section is connected with one end of the stress release elastic section into a whole through the first conical connecting section, and the cervical vertebra part pressing section is connected with the other end of the stress release elastic section into a whole through the second conical connecting section.

The invention has the positive effects that: after the elastic connecting rod of the cervical vertebra posterior system is adopted, because the connecting rod body comprises an occipital part pressing section and a cervical vertebra part pressing section which are integrated or fixedly connected with each other, and a stress releasing elastic section is also arranged between the occipital part pressing section and the cervical vertebra part pressing section, the outer diameter of the stress releasing elastic section is larger than that of the occipital part pressing section and the cervical vertebra part pressing section,

because the stress release elastic section is additionally arranged between the occipital part pressing section and the cervical vertebra part pressing section of the connecting rod body, in the process of operation, when the connecting rod is implanted and bent, the bending stress is uniformly distributed, the stress concentration is avoided, the fatigue mechanical property can be improved, and the problems of fatigue strength and stress concentration fracture caused by local bending of the connecting rod in the prior art can be solved. After operation, even if the head of a patient moves up and down, the stress release elastic section can slowly load and release the bending stress, the effect similar to the buffering force of a spring is achieved, and the fatigue life of the connecting rod can be effectively prolonged.

Drawings

FIG. 1 is a schematic structural view of a first embodiment of the present invention;

FIG. 2 is a schematic structural view of a second embodiment of the present invention;

FIG. 3 is a schematic structural view of a third embodiment of the present invention;

fig. 4 is a schematic structural diagram of a fourth embodiment of the present invention.

Detailed Description

The invention is further illustrated, but not limited, by the following examples in connection with the accompanying drawings.

As shown in fig. 1, 2, 3 and 4, an elastic connecting rod for a posterior cervical vertebra system comprises a connecting rod body 1, wherein the connecting rod body 1 comprises an occipital bone pressing section 11 and a cervical vertebra pressing section 12 which are integrated or fixedly connected with each other, a stress releasing elastic section 13 is further arranged between the occipital bone pressing section 11 and the cervical vertebra pressing section 12, and the outer diameter of the stress releasing elastic section 13 is larger than the occipital bone pressing section 11 and the cervical vertebra pressing section 12.

As shown in fig. 1, in order to improve the fatigue mechanical property of the present invention, an elastic groove 131 in a coil spring shape is formed on the outer circumferential wall of the stress relief elastic section 13.

As shown in fig. 1, further, in order to adapt to different distances from the occipital screw seats at both ends of the occipital plate to the pedicle screw seat implanted in the upper limb of the cervical vertebra segment during the operation, the pitch P of the spiral spring-shaped elastic groove 131 is controlled within a range of 1mm to 2mm, and the length L1 is controlled within a range of 10mm to 30 mm. The outer diameter R of the elastic groove 131 which is in the shape of a spiral spring and is in the stress release elastic section 13 is 4.5 mm-6.0 mm, the inner diameter R1 is 3.5 mm-5.0 mm, the outer diameter and the inner diameter of the elastic groove 131 in the shape of the spiral spring are designed in an arc shape, so that the bending stress is uniformly distributed when the elastic groove is bent, the stress concentration is avoided, and the fatigue mechanical property is improved. After operation, when the head of a patient moves up and down, the bending thread section can slowly load and release bending stress, the effect similar to the buffering force of a spring is achieved, and the fatigue life of the connecting rod can be effectively prolonged.

As shown in fig. 2, of course, the elastic grooves are not limited to the spiral spring-like elastic grooves, and the outer circumferential wall of the stress releasing elastic segment 13 may be provided with uniformly arranged annular elastic grooves 132, and an annular protrusion 133 is disposed between adjacent annular elastic grooves 132.

Further, the distance d between adjacent annular elastic grooves 132 is controlled within the range of 1 mm-2 mm, and the length L2 is controlled within the range of 10 mm-30 mm. Be annular protruding 133 between adjacent annular elastic groove 132, and the bellied external diameter control of annular is in 4.5mm ~6.0mm within range, and annular elastic groove 132 end footpath control is in 3.5mm ~5.0mm within range, and the purpose of design like this can make the connective bar more laborsaving in the bending, and connective bar bending deformation is more even, and bending stress distributes evenly during the bending, avoids stress concentration, improves tired mechanical properties. After operation, when the head of a patient moves up and down, the bending straight groove section can slowly load and release bending stress, the effect similar to the buffering force of a spring is achieved, and the fatigue life of the connecting rod can be effectively prolonged.

As shown in fig. 1 and 2, the occipital portion pressing section 11 and the cervical portion pressing section 12 are straight sections having smooth outer walls, and the stress-relief elastic section 13 is a straight section. The outer diameters of the occipital bone pressing section 11 and the cervical vertebra pressing section 12 are both 3.2mm or 3.5 mm.

As shown in fig. 3 and 4, the stress relief elastic section 13 is an arc-shaped section. The radian of the stress release elastic section 13 is 100-150 degrees when the stress release elastic section is an arc-shaped section.

As shown in fig. 1, 2, 3 and 4, the occipital portion pressing section 11 is integrally connected to one end of the stress-releasing elastic section 13 through a first tapered connecting section 14, and the cervical portion pressing section 12 is integrally connected to the other end of the stress-releasing elastic section 13 through a second tapered connecting section 15.

The connecting rod body is a titanium alloy connecting rod, and the stress release elastic section is additionally arranged between the occipital part pressing section and the cervical vertebra part pressing section, so that the bending stress is uniformly distributed when the connecting rod is implanted and bent, the stress concentration is avoided, the fatigue mechanical property can be improved, and the problems of fatigue strength and stress concentration fracture caused by local bending of the connecting rod in the prior art can be solved. After operation, even if the head of a patient moves up and down, the stress release elastic section can slowly load and release the bending stress, the effect similar to the buffering force of a spring is achieved, and the fatigue life of the connecting rod can be effectively prolonged.

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.