CN112603452A

CN112603452A - Vertebra depth-setting radial slotting device

Info

Publication number: CN112603452A
Application number: CN202011479031.1A
Authority: CN
Inventors: 解宝
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-12-15
Filing date: 2020-12-15
Publication date: 2021-04-06

Abstract

The invention relates to a vertebra depth-fixing radial slotting device, and belongs to the field of medical instruments. The cutting assembly comprises a vertical rod, a lower bearing is fixed at the lower end of the vertical rod, a lower bearing outer ring is fixed on the vertical rod, a lower bearing inner ring is coaxially fixed with a rotating shaft, a saw blade and a driven wheel are coaxially fixed on the rotating shaft respectively, a motor is fixed on the vertical rod, a coaxially fixed driving wheel is arranged on the motor rotating shaft, and the driving wheel is in transmission connection with the driven wheel through a belt. The cutting depth is controllable, the cutting is accurate, the cutting is not easy to slip, the healthy vertebra can not be cut, and the operation effect is ensured.

Description

Vertebra depth-setting radial slotting device

Technical Field

The invention relates to a vertebra depth-fixing radial slotting device, and belongs to the field of medical instruments.

Background

There are two existing surgical approaches to vertebral pathology:

one is to replace the whole vertebra by a prosthesis, and the prosthesis is directly connected with the end faces of the upper vertebra and the lower vertebra in a semi-movable way to restore the function of the vertebra, but the operation mode is very difficult because the posterior of the vertebra is connected with bone tissues such as ribs, vertebral pedicles, vertebral arch plates and the like, wherein the vertebra, the vertebral pedicle and the vertebral arch plate jointly form a vertebral canal which protects the spinal cord and nerves of a person. Since the replacement operation requires cutting off the vertebrae from the pedicles, the body of the knife is very close to the spinal cord, which is highly likely to cause damage to the spinal cord and nerve roots, resulting in irreversible damage. In addition, after the prosthesis is replaced, the prosthesis is fixed with the vertebral pedicle with great difficulty, because the spinous process and the transverse process between the vertebrae are mutually extruded, if the fixation is not good, the vertebral pedicle is separated from the prosthesis, and the end surface of the vertebral pedicle can cut the spinal cord and nerves.

The other type is intervertebral fusion, namely, the diseased vertebra is fixedly connected through a pedicle screw, so that the diseased vertebra segment loses the moving function, and the aim of eliminating pain is fulfilled. However, such surgery can cause degeneration of the adjacent vertebrae and, in addition, can cause surgical complications.

Neither of the above-mentioned two procedures can completely replace the work of the vertebrae, and there are many protrusions that cause obstruction to the nearby blood vessels and nerves, causing complications or inflammation. When a vertebral replacement operation is performed, an intervertebral disc is usually replaced together, the intervertebral disc usually comprises an upper fixing plate, a lower fixing plate and an elastic body positioned between the upper fixing plate and the lower fixing plate, the elastic body of an intervertebral disc prosthesis is usually made of a silica gel material with good biocompatibility, but different from other human implantable silica gel materials, the intervertebral disc prosthesis needs to bear large load, continuous pressure and deformation cause silica gel fatigue, finally the elastic body is collapsed and hardened, the intervertebral disc prosthesis completely loses effect and needs to be replaced again through an operation, and a patient possibly faces 2-4 replacement operations caused by the elastomer fatigue in a lifetime, so that extra pain and economic burden are caused to the patient. In addition, the failure of the elastomer is often not perceived by the patient himself, resulting in rigid contact between the vertebrae, increased impact and wear, poor intervertebral environment, and serious patients with the possibility of losing the possibility of re-operation.

In order to overcome the deficiencies in the prior art, the 2020113559457 patent application discloses a hidden vertebral support replacement body, which is used to open the slots in the vertebrae and then implant the support body in the bone slots to overcome the deficiencies in the prior art. Due to the particularity of the vertebrae, the posterior vertebrae are the spinal cord and nerves, which may be injured if sawed too deeply; the vertebrae are generally cylindrical, and the circular saw is easy to slip on the arc-shaped vertebral side surface, so that serious cutting injury can be caused to surrounding tissues; the manual control circular saw is easy to saw off, so that the implant is not matched with the groove, and the effect of the operation is influenced; the saw blade also tends to injure the healthy vertebrae at both ends during cutting, causing additional injury.

Disclosure of Invention

According to the defects in the prior art, the technical problems to be solved by the invention are as follows: the vertebra fixed-depth radial slotting device is controllable in cutting depth, accurate in cutting, not prone to slipping, capable of preventing healthy vertebra from being cut and capable of guaranteeing operation effect.

The vertebra depth-fixing radial groover comprises a cutting assembly and a limiting assembly;

the cutting assembly comprises a vertical rod, a lower bearing is fixed at the lower end of the vertical rod, an outer ring of the lower bearing is fixed on the vertical rod, an inner ring of the lower bearing is coaxially fixed with a rotating shaft, a saw blade and a driven wheel are coaxially fixed on the rotating shaft respectively, a motor is fixed on the vertical rod, a driving wheel is coaxially fixed on the rotating shaft of the motor, and the driving wheel is in transmission connection with the driven wheel through a belt;

the limiting assemblies comprise two translation rods, the lower ends of the translation rods are fixed with the inverted-V-shaped positioning plates, the translation rods are arranged on bisectors of the angles of the positioning plates, the limiting assemblies are located on two sides of the cutting assembly respectively, the translation rods of the two limiting assemblies are the same as the distance between the vertical rods, the vertical rods are matched with the outer barrels, the upper ends of the translation rods of the two limiting assemblies are installed on the outer barrels respectively, and meanwhile, the included angle bisectors of the two positioning plates are located in a plane where the saw blades are located.

Support the locating plate of two spacing subassemblies on the left vertebra and the right vertebra at pathological change vertebra both ends, because the vertebra surface is the arc, and the locating plate is the V-arrangement, so the locating plate has two contact points with the vertebra, the locating plate just blocks the vertebra, avoid the locating plate skew of skidding, the contained angle bisector of two locating plates passes through the vertebra axis simultaneously, and the contained angle bisector of two locating plates is in the plane at saw bit place, radial cutting pathological change vertebra that the saw bit can be accurate has just so just also been guaranteed, make the bone groove both sides wall thickness that cuts out the part the same, avoid both sides wall thickness one big or small to lead to the bearing capacity different, and then guarantee cutting precision and operation effect. After the locating plate is clamped, a motor is started, the motor drives a driven wheel to rotate through a driving wheel, the driven wheel drives a saw blade to rotate, the vertical rod is held by a hand to move downwards, the saw blade cuts diseased vertebra, and feeding of the saw blade is stopped when the diseased vertebra is to be cut to a limited depth.

Including opening the subassembly all, it includes the screw rod to open the subassembly all, coaxial fixed upper bearing on the screw rod, and the screw rod is fixed at the upper bearing inner circle, and the upper bearing outer lane is fixed on the urceolus, and the perpendicular montant setting of screw rod, screw rod both ends cooperate the nut respectively, and the internal thread of two nuts revolves to opposite, and two nuts are fixed respectively on two translation poles, and two nuts are the same to the distance of upper bearing. And the screw rod is rotated, the two nuts are simultaneously close to or far away from each other, and then the two translation rods are controlled to be simultaneously close to or far away from each other, so that the vertebra with different sizes can be adapted.

Including looking for the subassembly in, look for the subassembly including looking for well cover, look for well cover and fix on the locating plate, look for well cover fit in and look for the king-rod, look for the fixed right angle board of king-rod lower extreme, right angle board upper portion is parallel with vertebra axis, and the lower part is parallel with vertebra terminal surface, and two are looked for the subassembly and set up in opposite directions, look for the king-rod and are parallel with the contained angle bisector of locating plate, and the vertical part of two right angle boards is in the inboard. Before slotting, firstly, the screw rod is rotated, so that the vertical parts of the two right-angle plates respectively correspond to intervertebral gaps at two ends of the diseased vertebra, then the vertical parts of the right-angle plates are inserted into the intervertebral gaps, then the screw rod is rotated reversely, and the two right-angle plates are far away until the vertical parts of the two right-angle plates are extruded to the inner end faces of the vertebrae at two sides. Regardless of being close to or keeping away from, the distance of two translation poles and montant is the same all the time, so the saw bit just is in the positive centre of two locating plates all the time, on the inner terminal surface of two right-angle plate vertical parts extrusion to both sides vertebra, can avoid on the one hand the saw bit to remove about, can guarantee simultaneously that the fluting position of saw bit is in the positive centre of pathological change vertebra for the bone groove is in the positive centre of pathological change vertebra, and then guarantees that the bone groove degree of depth changes evenly, is regular circular arc, in order to match with the supporter, reliably stable. The centering sleeve is matched with the centering rod, so that the centering rod can be always parallel to the included angle bisector of the positioning plate, and the positioning work of the positioning plate is prevented from being blocked. The right-angle plate can also play the guard action to the vertebra at both ends, avoids the saw bit to cut healthy vertebra at both ends.

The guide rod is fixed on the outer barrel and parallel to the screw rod, two ends of the guide rod are respectively matched with the guide sleeves, and the two guide sleeves are respectively fixed on the two translation rods. The guide sleeve and the guide rod play a role in guiding, the two translation rods are guaranteed to be parallel all the time, and the translation rods are prevented from rotating around the screw rods.

Including the limit for depth subassembly, the limit for depth subassembly includes the extension rod, and extension rod inner is fixed on the montant, and the fixed limit for depth cover of extension rod outer end, limit for depth cover fit in depth pole, the limit for depth pole is parallel with the montant, and the position of limit for depth pole corresponds with the position of right angle board, sets up the screw hole on the limit for depth cover lateral wall, threaded hole fit bolt. And loosening the bolt, adjusting the vertical distance between the bottom end of the depth-limiting rod and the lower edge of the saw blade, and then tightening the bolt to tightly extrude and fix the depth-limiting rod, wherein the distance is the depth of the saw blade for cutting the bone groove. When the lower end of the depth rod is contacted with the right-angle plate, the saw blade stops moving downwards, so that the depth of the bone groove can be conveniently and accurately controlled, and the spinal cord and nerves are prevented from being injured due to the fact that the saw is too deep. The position of depth stop pole corresponds with the position of right-angle plate, and right-angle plate upper portion is tangent with the vertebra surface, guarantees like this that the depth stop pole lower extreme contacts with the right-angle plate throughout with vertebra surface upper edge parallel and level, guarantees the depth limit precision of depth stop pole, also avoids the saw bit to advance too big and injure the healthy vertebra in both ends simultaneously.

Set up the scale on the depth stop lever, zero scale is in the depth stop lever upper end, and other scales downwardly extending, the fixed limit for depth separation blade of depth stop lever upper end, limit for depth separation blade width are greater than the internal diameter of limit for depth cover, and when limit for depth separation blade and the contact of limit for depth cover upper end, depth stop lever lower extreme and saw bit lower edge parallel and level. Therefore, the height of the depth limiting rod pulled out from the depth limiting sleeve can be conveniently read from the scales, and the degree is the cutting depth of the saw blade, namely the depth of the bone groove, so that the cutting is more accurate and convenient.

The handle is fixed at the upper end of the vertical rod, so that the handle is convenient to hold.

The end part of the screw rod is fixed with a twisting handle, so that the screw rod is convenient to rotate.

The upper end of the centering rod is fixed with a centering baffle, and the width of the centering baffle is larger than the inner diameter of the centering sleeve. The centering baffle prevents the centering rod from falling out.

The power supply is fixed on the vertical rod and connected with the motor to provide electric energy for the motor.

Compared with the prior art, the invention has the beneficial effects that:

according to the vertebra depth-fixing radial groover, the positioning plate is V-shaped, so that two contact points exist between the positioning plate and the vertebra, the positioning plate clamps the vertebra, the positioning plate is prevented from slipping and deviating, the saw blade can be used for accurately and radially cutting the diseased vertebra, the wall thicknesses of two sides of a cut bone groove are the same, the situation that the bearing capacity is different due to the fact that the wall thicknesses of the two sides are one larger and one smaller is avoided, and the cutting precision and the operation effect are further guaranteed. The distance between the two translation rods and the vertical rod is the same all the time, so that the saw blade is always positioned in the middle of the two positioning plates, when the vertical parts of the two right-angle plates extrude the inner end surfaces of the vertebrae at two sides, the saw blade can be prevented from moving left and right, and meanwhile, the slotting position of the saw blade can be ensured in the middle of the diseased vertebrae, so that the bone groove is positioned in the middle of the diseased vertebrae, the depth change of the bone groove is ensured to be uniform, the saw blade is a regular circular arc, and the saw blade is matched with the supporting body. The centering sleeve is matched with the centering rod, so that the centering rod can be always parallel to the included angle bisector of the positioning plate, and the positioning work of the positioning plate is prevented from being blocked. The right-angle plate can also play the guard action to the vertebra at both ends, avoids the saw bit to cut healthy vertebra at both ends. When the lower end of the depth rod is contacted with the right-angle plate, the saw blade stops moving downwards, so that the depth of the bone groove can be conveniently and accurately controlled, and the spinal cord and nerves are prevented from being injured due to the fact that the saw is too deep. The position of depth stop pole corresponds with the position of right-angle plate, and right-angle plate upper portion is tangent with the vertebra surface, guarantees like this that the depth stop pole lower extreme contacts with the right-angle plate throughout with vertebra surface upper edge parallel and level, guarantees the depth limit precision of depth stop pole, also avoids the saw bit to advance too big and injure the healthy vertebra in both ends simultaneously. The cutting depth is controllable, the cutting is accurate, the cutting is not easy to slip, the healthy vertebra can not be cut, and the operation effect is ensured.

Drawings

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

FIG. 2 is a schematic cross-sectional view of the embodiment A-A shown in FIG. 1;

FIG. 3 is a schematic cross-sectional view of embodiment B-B shown in FIG. 1.

In the figure: 1. a grip; 2. a vertical rod; 3. an outer cylinder; 4. an upper bearing; 5. a guide bar; 6. a power source; 7. a translation rod; 8. a nut; 9. twisting a handle; 10. a guide sleeve; 11. a depth limiting baffle plate; 12. an extension pole; 13. a bolt; 14. a threaded hole; 15. a depth limiting sleeve; 16. a depth stop lever; 17. centering a baffle plate; 18. centering rods; 19. centering; 20. positioning a plate; 21. a right-angle plate; 22. a left vertebra; 23. a diseased vertebra; 24. a driving wheel; 25. a belt; 26. a saw blade; 27. a driven wheel; 28. a right vertebra; 29. a lower bearing; 30. bone grooves.

Detailed Description

Embodiments of the invention are further described below with reference to the accompanying drawings:

as shown in figures 1-3, the vertebra depth-fixing radial groover comprises a cutting component and a limiting component;

the cutting assembly comprises a vertical rod 2, a lower bearing 29 is fixed at the lower end of the vertical rod 2, the outer ring of the lower bearing 29 is fixed on the vertical rod 2, the inner ring of the lower bearing 29 is coaxially fixed with a rotating shaft, a saw blade 26 and a driven wheel 27 are coaxially fixed on the rotating shaft respectively, a motor is fixed on the vertical rod 2, a driving wheel 24 is coaxially fixed on the rotating shaft of the motor, and the driving wheel 24 is in transmission connection with the driven wheel 27 through a belt 25;

spacing subassembly includes translation pole 7, the fixed locating plate 20 of falling V-arrangement of 7 lower extremes of translation pole, translation pole 7 is on the bisector of the angle of locating plate 20, spacing subassembly is two, be located the cutting assembly both sides respectively, the translation pole 7 of two spacing subassemblies is the same with montant 2's distance, the cooperation has urceolus 3 on montant 2, install respectively on urceolus 3 on the translation pole 7 upper end of two spacing subassemblies, the contained angle bisector of two locating plates 20 is in the plane at saw bit 26 place simultaneously.

Support two spacing subassembly's locating plate 20 on the left vertebra 22 and the right vertebra 28 at pathological change vertebra 23 both ends, because the vertebra surface is the arc, and locating plate 20 is the V-arrangement, so locating plate 20 has two contact points with the vertebra, locating plate 20 just blocks the vertebra, avoid locating plate 20 skew of skidding, the contained angle bisector of two locating plates 20 passes through the vertebra axis simultaneously, and the contained angle bisector of two locating plates 20 is in the plane at saw bit 26 place, so just also guaranteed that saw bit 26 can be accurate radial cutting pathological change vertebra 23, make the wall thickness in the both sides of the bone groove 30 of cutting out the same, it leads to the bearing capacity difference to avoid both sides wall thickness one big or small, and then guarantee cutting accuracy and operation effect. After the positioning plate 20 is clamped, the motor is started, the motor drives the driven wheel 27 to rotate through the driving wheel 24, the driven wheel 27 drives the saw blade 26 to rotate, the handheld vertical rod 2 moves downwards, the saw blade 26 cuts the diseased vertebra 23, and the feeding of the saw blade 26 is stopped when the diseased vertebra is to be cut to the limited depth.

Including all opening the subassembly, all opening the subassembly and including the screw rod, coaxial fixed upper bearing 4 on the screw rod, the screw rod is fixed at 4 inner circles of upper bearing, and the upper bearing 4 outer lane is fixed on urceolus 3, and the perpendicular montant 2 of screw rod sets up, and the screw rod both ends cooperate nut 8 respectively, and the internal thread of two nuts 8 revolves to opposite, and two nuts 8 are fixed respectively on two translation poles 7, and two nuts 8 are the same to the distance of upper bearing 4. And the two nuts 8 are close to or far away from each other simultaneously by rotating the screw rods, so that the two translation rods 7 are controlled to be close to or far away from each other simultaneously, and the vertebra with different sizes are adapted.

Including looking for the subassembly in, looking for the subassembly including looking for well cover 19, looking for well cover 19 and fixing on locating plate 20, looking for well 19 fit in and looking for well pole 18, looking for the fixed right angle board 21 of well pole 18 lower extreme, right angle board 21 upper portion is parallel with the vertebra axis, and the lower part is parallel with the vertebra terminal surface, and the subassembly sets up in opposite directions in two looks for, and the contained angle bisector of looking for well pole 18 and locating plate 20 is parallel, and the vertical part of two right angle boards 21 is in the inboard. Before slotting, firstly, the screw rod is rotated, so that the vertical parts of the two right-angle plates 21 respectively correspond to intervertebral spaces at two ends of the diseased vertebra 23, then the vertical parts of the right-angle plates 21 are inserted into the intervertebral spaces, and then the screw rod is rotated reversely, so that the two right-angle plates 21 are far away until the vertical parts of the two right-angle plates 21 are extruded onto the inner end surfaces of the vertebrae at two sides. Regardless of being close to or far away from, the distance between the two translation rods 7 and the vertical rod 2 is the same all the time, so the saw blade 26 is always positioned in the middle of the two positioning plates 20, when the vertical parts of the two right-angle plates 21 are extruded onto the inner end surfaces of the vertebrae at the two sides, on one hand, the saw blade 26 can be prevented from moving left and right, and meanwhile, the slotting position of the saw blade 26 can be ensured in the middle of the diseased vertebrae 23, so that the bone slot 30 is positioned in the middle of the diseased vertebrae 23, and further, the depth of the bone slot 30 is ensured to be changed uniformly and is a regular circular arc. The centering sleeve 19 is matched with the centering rod 18, so that the centering rod 18 can be always parallel to the bisector of the included angle of the positioning plate 20, and the positioning work of the positioning plate 20 is prevented from being hindered. The right-angle plate 21 can also protect vertebrae at two ends, and prevent the saw blade 26 from cutting healthy vertebrae at two ends.

The guide rod 5 is fixed on the outer cylinder 3, the guide rod 5 is parallel to the screw, two ends of the guide rod 5 are respectively matched with the guide sleeves 10, and the two guide sleeves 10 are respectively fixed on the two translation rods 7. The guide sleeve 10 and the guide rod 5 play a role in guiding, the two translation rods 7 are guaranteed to be parallel all the time, and the translation rods 7 are prevented from rotating around the screw rods.

Including the limit for depth subassembly, the limit for depth subassembly includes extension rod 12, and extension rod 12 the inner is fixed on montant 2, and extension rod 12 outer end fixed limit for depth cover 15, limit for depth cover 15 fit in depth pole 16, and limit for depth pole 16 is parallel with montant 2, and the position of limit for depth pole 16 corresponds with the position of right angle board 21, sets up screw hole 14 on the limit for depth cover 15 lateral wall, screw hole 14 fit in bolt 13. The bolt 13 is loosened, the vertical distance between the bottom end of the depth-limiting rod 16 and the lower edge of the saw blade 26 is adjusted, and then the bolt 13 is tightened to tightly press and fix the depth-limiting rod 16, wherein the distance is the depth of the bone groove 30 cut by the saw blade 26. When the lower end of the depth-limiting rod 16 is contacted with the right-angle plate 21, the saw blade 26 stops moving downwards, so that the depth of the bone groove 30 can be conveniently and accurately controlled, and the spinal cord and nerves are prevented from being injured due to the fact that the depth of the bone groove is too deep. The position of the depth-limiting rod 16 corresponds to the position of the right-angle plate 21, and the upper part of the right-angle plate 21 is tangent to the surface of the vertebra, so that the lower end of the depth-limiting rod 16 is always flush with the upper edge of the surface of the vertebra when contacting the right-angle plate 21, the depth-limiting precision of the depth-limiting rod 16 is guaranteed, and the situation that the healthy vertebra at two ends is injured due to too large depth of the saw blade 26 is avoided.

Set up the scale on the depth stop lever 16, zero scale is in the depth stop lever 16 upper end, and other scales downwardly extending, fixed depth stop piece 11 of depth stop lever 16 upper end, and depth stop piece 11 width is greater than the 15 internal diameters of depth stop cover, and when depth stop piece 11 and the contact of the 15 upper ends of depth stop cover, 16 lower extremes of depth stop lever and 26 lower edge parallel and level of saw bit. Thus, the height of the depth-limiting rod 16 pulled out from the depth-limiting sleeve 15 can be conveniently read from the scale, and the degree is the cutting depth of the saw blade 26, namely the depth of the bone groove 30, so that the cutting is more accurate and convenient.

The upper end of the vertical rod 2 is fixed with the handle 1, which is convenient for holding.

The end part of the screw rod is fixed with a twisting handle 9, which is convenient to rotate.

The upper end of the centering rod 18 is fixed with a centering baffle 17, and the width of the centering baffle 17 is larger than the inner diameter of the centering sleeve 19. The centering bar 17 prevents the centering bar 18 from coming out.

The power supply 6 is fixed on the vertical rod 2, and the power supply 6 is connected with the motor and provides electric energy for the motor.

These and other changes can be made to the present apparatus with reference to the above detailed description. While the above detailed description describes certain embodiments of the invention and describes the best mode contemplated, no matter how detailed the above appears in text, the system can be practiced in many ways. The details of the local-based support device, although considerable variation in its implementation details is possible, are nevertheless contained within the device disclosed herein. As noted above, particular technical terms used in describing particular features or aspects of the present apparatus do not imply that the terms are redefined herein to be restricted to specific characteristics, features, or aspects of the system with which the terms are associated. In general, the terms used in the following claims should not be construed to limit the system to the specific embodiments disclosed in the specification, unless the above detailed description section explicitly defines such terms. Accordingly, the actual scope of the system encompasses not only the disclosed embodiments, but also all equivalent ways of practicing or implementing the apparatus covered by the claims.

Claims

1. A vertebra depthkeeping radial fluting ware which characterized in that: comprises a cutting component and a limiting component;

the cutting assembly comprises a vertical rod (2), a lower bearing (29) is fixed at the lower end of the vertical rod (2), the outer ring of the lower bearing (29) is fixed on the vertical rod (2), the inner ring of the lower bearing (29) is coaxially fixed with a rotating shaft, a saw blade (26) and a driven wheel (27) are coaxially fixed on the rotating shaft respectively, a motor is fixed on the vertical rod (2), a driving wheel (24) is coaxially fixed on the rotating shaft of the motor, and the driving wheel (24) is in transmission connection with the driven wheel (27) through a belt (25);

spacing subassembly includes translation pole (7), fixed locating plate (20) of falling V-arrangement of translation pole (7) lower extreme, translation pole (7) are on the bisector of the angle of locating plate (20), spacing subassembly is two, be located the cutting assembly both sides respectively, translation pole (7) and the distance of montant (2) of two spacing subassemblies are the same, the cooperation has urceolus (3) on montant (2), install respectively on urceolus (3) translation pole (7) upper end of two spacing subassemblies, the contained angle bisector of two locating plates (20) is in the plane at saw bit (26) place simultaneously.

2. The vertebra depth setting radial groover of claim 1, wherein: support locating plate (20) with two spacing subassemblies on left vertebra (22) and right vertebra (28) at pathological change vertebra (23) both ends, because the vertebra surface is the arc, and locating plate (20) are the V-arrangement, so locating plate (20) have two contact points with the vertebra, locating plate (20) just block the vertebra, avoid locating plate (20) skew of skidding, the contained angle bisector of two locating plates (20) passes through the vertebra axis simultaneously, and the contained angle bisector of two locating plates (20) is in the plane at saw bit (26) place, just so guaranteed that saw bit (26) can be accurate radial cutting pathological change vertebra (23).

3. The vertebra depth setting radial groover of claim 1, wherein: including all opening the subassembly, all opening the subassembly and including the screw rod, coaxial fixed upper bearing (4) on the screw rod, the screw rod is fixed at upper bearing (4) inner circle, upper bearing (4) outer lane is fixed on urceolus (3), the perpendicular montant (2) of screw rod set up, screw rod both ends cooperate nut (8) respectively, the internal thread of two nuts (8) revolves to opposite, two nuts (8) are fixed respectively on two translation poles (7), two nuts (8) are the same to the distance of upper bearing (4).

4. The vertebra depth setting radial groover of claim 3, wherein: including looking for the subassembly in, look for the subassembly including looking for well cover (19), look for well cover (19) and fix on locating plate (20), look for well cover (19) fit in and look for king-rod (18), look for fixed right angle board (21) of king-rod (18) lower extreme, right angle board (21) upper portion is parallel with the vertebra axis, the lower part is parallel with vertebra terminal surface, two are looked for the subassembly and set up in opposite directions, look for the contained angle bisector parallel of king-rod (18) and locating plate (20), the vertical part of two right angle boards (21) is in the inboard.

5. The vertebra depth setting radial groover of claim 3, wherein: a guide rod (5) is fixed on the outer cylinder (3), the guide rod (5) is parallel to the screw rod, two ends of the guide rod (5) are respectively matched with guide sleeves (10), and the two guide sleeves (10) are respectively fixed on the two translation rods (7).

6. The vertebra depth setting radial groover of claim 1, wherein: including the limit for depth subassembly, the limit for depth subassembly includes extension rod (12), extension rod (12) inner is fixed on montant (2), extension rod (12) outer end fixed limit for depth cover (15), limit for depth cover (15) fit in limit for depth pole (16), limit for depth pole (16) are parallel with montant (2), the position of limit for depth pole (16) corresponds with the position of right angle board (21), set up screw hole (14) on limit for depth cover (15) lateral wall, screw hole (14) fit in bolt (13).

7. The vertebra depth setting radial groover of claim 6, wherein: set up the scale on depth stop lever (16), zero scale is in depth stop lever (16) upper end, and other scales extend downwards, and depth stop piece (11) are fixed to depth stop lever (16) upper end, and depth stop piece (11) width is greater than depth limit cover (15) internal diameter, and when depth stop piece (11) and depth limit cover (15) upper end contact, depth stop lever (16) lower extreme and saw bit (26) lower edge parallel and level.