JPH0779998A - Plate hook for bone joining, and position impactor to be used for said plate hook - Google Patents

Abstract

PURPOSE: To completely stabilize a vertebra and a piece of the vertebra, and to obtain the high rigidity in a longitudinal direction even though the high stress is applied to the vertebra positioned on this part of the vertebra. CONSTITUTION: A plate comprising a through hole 13 for a fixing tool, and plural stylus projections 12, is installed, and the through holes 13 are formed as the slots having a major side in a longitudinal direction of the plate 11, at the both edges of the plate 11. The stylus projections 12 respectively comprising an ahchor tooth 121 is installed near the through holes 13. The plate 11 comprises a hole 14 for fixing the position impactor at an almost central port of the same.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an osteosynthesis plate hook and a position impactor used therefor.

[0002]

BACKGROUND OF THE INVENTION In bone surgery it is known to use plates and bolts (fixtures) to keep bone fragments stable with respect to each other for the purpose of obtaining optimal bone stress for bone formation. The corrugated sheets used for this purpose is one example. Corrugated sheets are mainly used in the field of tibial cutting.

[0003]

In the field of the spine, especially the cervical spine, it is often necessary to stabilize two adjacent vertebrae while pressing or pulling. Alternatively, it is often necessary to maintain the vertebrae fragments or implants facing each other to facilitate bone formation and fusion. This is usually done by implanting with bolts that connect the heads with rods or plates. However, this type of method has problems that the binding force is too strong, and the dimensions of the rod and the plate are still too large, and improvement thereof is strongly desired especially when applied to the cervical vertebra.

An object of the present invention is to eliminate the above-mentioned disadvantages of the prior art. That is, the present invention, on the one hand, is able to fully stabilize the vertebrae or fragments of vertebrae in an ideal position suitable for the therapeutic effect being advanced, while on the other hand, the plate is thin and is located at this point of the spine. The problems of the prior art described above are solved by developing such a plate hook and a position impactor used therefor, which can obtain high rigidity in the longitudinal direction despite high stress applied to the vertebrae. .

[0005]

In order to achieve the above object, the plate hook of the present invention is characterized by a bone joint having a plate having a through hole for passing a fixing tool and a plurality of needle-like projections. A plate hook for use, wherein the through holes are formed as long holes having long sides in the longitudinal direction of the plate at both ends of the plate, and the needle-like projections are provided near the through holes. And the plate further has a hole for fixing the position impactor at a substantially central portion thereof.

The plate is a single plate having a shape bulging in its longitudinal direction, and a plurality of the needle-like protrusions form a pair with the through holes formed at the ends of the plate sandwiched therebetween. If they are symmetrically provided, the shape and strength are convenient for osteosynthesis.

It is preferable in terms of strength that the needle-like projection is connected to the flat plate portion of the plate by a curved portion connected to the plate in a curved shape.

It is preferable that the plate is manufactured by room temperature punching and bending performed on a plate-shaped metal, or by a casting method in terms of material and productivity. The plate is preferably made of stainless steel or titanium.

The characteristic structure of the position impactor used in the above-mentioned plate hook for osteosynthesis according to the present invention is that the position impactor has a square pedestal that fits the curved portion of the needle-like protrusion connected to the curved shape of the plate. The point is that a rod with a shoulder having a male screw portion having a pitch and a size corresponding to the size and pitch of the threaded hole located substantially in the center of the plate is attached to the substantially central part of the pedestal. .

Further, the characteristic structure of the position impactor used in the above-mentioned plate hook for osteosynthesis according to the present invention is that a rectangular pedestal that fits the curved portion of the needle-like protrusion connected to the curved shape of the plate is used. At the center of the pedestal, an end having a size corresponding to the inner diameter of the threaded hole located at the center of the plate, and a shoulder rod having a hook and forceps with an arm are fixed. That is, the forceps are attracted to each other by a biasing tool interposed between the arms while being held in a hole formed in the shoulder rod above the connecting shaft.

[0011]

The osteosynthesis plate hook of the present invention essentially ensures that the vertebrae or bone fragments after being fastened with the plate hook will be stable even without bolts, so that they will occur during osteotomy. Possible misalignment is surely prevented, bone fragments can be fixed well, and the plate hook can be easily deformed without any fear of being deformed at the moment of impact, even though the cost is extremely low. Can be installed. And since the needle-like projections are provided with anchor teeth, they additionally additionally ensure a clamping effect on the cortex, which is ensured by a fixing bolt inserted in the slot of the curved plate.

In particular, the plate is a single plate having a shape that bulges in the longitudinal direction, and a plurality of needle-like protrusions are symmetrical with respect to each other with a through hole formed at each end of the plate sandwiching the through hole. It is more preferable because the shape is not increased and yet the external stress can be counteracted.

It is preferable that the anchor teeth of the needle-shaped protrusions are lateral (when the upper and lower bone fragments are connected to each other, the pointed tips have a width substantially parallel to the upper and lower bone fragments) and are symmetrical. Although any outward shape can be applied to the needle-like protrusion anchor, the shape is more preferably a harpoon shape.

If the needle-shaped projection is connected to the plate by a curved portion that is curvedly connected to the plate, the needle-shaped projection is liable to have mechanical strength in the bending region, which tends to occur when the needle-shaped projection is bent at a right angle. It eliminates the risk of deterioration and has high strength with high resistance to external stress.

The plate hook has high productivity, dimensional accuracy, and mechanical strength when it is manufactured by punching and bending at room temperature, that is, forming from plate metal such as stainless steel or titanium (including alloy). It is preferable because it is also excellent in terms of corrosion resistance, and safety to living bodies.

The plate hook is mounted via a position impactor which is composed of a curved pedestal and a square pedestal that fits the curve of the needle-like protrusions. The position impactor of the present invention is mounted on this pedestal. Since a rod with a shoulder having a male screw portion having a size and pitch corresponding to the female screw located at the center of the plate or forceps is provided in the center, the plate hook can be easily attached and detached and handled easily.

If the position impactor is composed of a square pedestal, an arm and a forceps with a hook fitted to the curved portion of the needle-shaped projection connected to the curved shape of the plate,
The position impactor grips the side surface and the lower surface of the plate, so that the plate hook can be securely attached and can be easily removed and handled.

[0018]

EFFECTS OF THE INVENTION Since the present invention has the above constitution, it is possible to surely stabilize the vertebrae or the fragments of the vertebrae in an ideal position suitable for the therapeutic effect being advanced, and the plate is thin. It is also suitable for application to cervical vertebrae, and a plate hook and a position impactor used therefor which can obtain high rigidity in the longitudinal direction even though high stress is applied to the vertebrae located at this position of the spine. Could be provided.

[0019]

Embodiments of the present invention will be described in detail with reference to the drawings. 1 to 4 and 7 show a single plate hook 10 and FIG. 8 shows a double plate hook 100.
Indicates. The curved plates 11 and 110 forming these plate hooks have needle-like projections 12 and 120.
And a long hole 13 through which the bolt 2 which is one kind of fixture is penetrated,
And 130. Then, the plate 11 is connected to a bolt type position impactor 30 composed of a pedestal 31 to which a rod 32 with a shoulder having a male screw portion 33 is attached in the central portion, as shown in FIG. 5, for example. Alternatively, the plate 11 is, for example, as shown in FIG. 6, a pedestal 21 attached to a rod 22 with a shoulder having an end portion 221 in the central portion, and a hook 25 that is pulled toward each other by a spring 28 that is one kind of biasing device. Two
It has a threaded hole 14 for handling and driving through a hook-type position impactor 20 composed of forceps 23, 24 having a 6 attached thereto.

Looking more closely at FIGS. 1-4 with respect to the single plate hook 10, the plate 11 enhances lateral moment of inertia and, consequently, lateral (plate longitudinal) to improve resistance to bending. direction)
Is provided with a bulge. And the needle-shaped protrusions 12
It is connected to the sides of the plate by a curved section having a radius large enough to eliminate the risk of mechanical strength degradation in the folding area, which is likely to occur when folding at right angles. The needle-shaped projections 12 are curved plates 1
Anchor teeth 121 are additionally provided to additionally ensure a clamping effect on the cortex, which is ensured by the fixing bolt 2 inserted in the slot 13.

Referring to FIG. 5, plate hook 10
Can be easily installed without risk of deformation via a bolt-type position impactor 30 having a pedestal 31 that surely fits the curved portion of the plate 11 and the curved portion of the needle-like protrusion 12. In this way, the shoulder rod 3
The total stress applied to 2 is the internal thread 1 of the curved plate 11.
It is integrally transmitted to the plate hook held on the pedestal 31 via the male screw portion 33 screwed to the screw 4.
After positioning and driving, simply rotate the rod 32 in the direction that the male screw part 33 loosens
The impactor 30 can be easily removed. After that,
The assembly may be fixed by bolts 2 that press the pleated head against the edges of the slot 13.

FIG. 6 shows a modification of that shown in FIG. In this case, the plate hook is a single plate hook 10 or a double plate hook 100.
However, the pedestal 21 is also the plate 11,
It fits the curved shape of 110 and the shape of the curved portion of the needle-like protrusion 12. The shoulder rod 22 with a smooth end 221 that is snugly secured to the pedestal 21
Forceps 2 with hooks 25 and 26 connected to a common connecting shaft 27
3, 24 are provided. These forceps 23, 24
Are attracted to each other by a spring 28 held in a hole 222 formed in the shoulder rod 22 above the connecting shaft 27 of the forceps 23 and 24.

Therefore, if this position impactor 20 is used, the arm 2 is used to separate the hooks 25 and 26.
When the pedestal 21 is engaged with the plate and the end portion 221 is engaged with the female screw 14 while tightening the screws 31 and 241, the plate hook 10 or the plate hook 100 is fixed to the forceps 2.
It is possible to grip with 3, 24. After loosening the arms 231, 241, the hooks 25, 26 are released.
Holds the lower parts of the plates 11 and 110 by the action of the spring 28. The plate hooks 10, 100 fixed by the above procedure, and their positions
The impactor 20 is provided to the corresponding vertebra by the movement of the shouldered rod 22 through the shaft so that the needle-like process 120 is advanced into the vertebra. The position impactor 20 can be detached from the rod with shoulder 2
It is completed by simply tightening the arms 231 and 241 while pulling 2.

7 and 8, the single type plate hook 10 can be used to fix two adjacent vertebrae (cervical vertebrae) 4 and 5.
The double plate hook 100 can be used to fix two non-adjacent vertebrae 4 and 6.

The plate hook according to the present invention can be manufactured by punching, conventional bending, electric discharge machining or laser machining, and the plate hook can also be manufactured by a casting method. Although various materials can be used for the plate hook, it is sufficient that the plate hook has a certain strength or more and can be used as a biomaterial for osteosynthesis, and TA6V4ELI is particularly preferable for use.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

Figure 1: Side view of plate hook

[Figure 2] Front view of the plate hook

FIG. 3 is a plan view of the plate hook.

[Figure 4] Development view of plate hook

FIG. 5 is a longitudinal sectional view of a bolt-type position impactor mounted on a plate hook.

FIG. 6 is a longitudinal sectional view of a hook-type position impactor mounted on a plate hook.

FIG. 7 is a perspective view of a single plate hook that connects two adjacent cervical vertebrae.

FIG. 8 is a perspective view of a double plate hook connecting two non-adjacent cervical vertebrae.

[Explanation of symbols]

 2 Fixtures 11, 110 Plates 12, 120 Needle-like projections 13, 130 Through holes 14, 140 Holes 20, 30 Position impactors 21, 31 Pedestals 22 Rods 23, 24 Forceps 25, 26 Hooks 27 Connecting shafts 28 Biasing tools 33 Male screw part 221 End part 222 hole 231, 241 Arm

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Jean Huper France F-42580 Letra Lorraine Julie 86 (72) Inventor Jean-Francois Jeanson France F-10320 Asenaire Clos Masse (no address)

Claims (8)

[Claims] 1. A through hole (1) for passing a fixture (2).
3, 130) and a plate (11, 110) having a plurality of needle-shaped projections (12, 120), wherein the through hole (13, 130) is the plate (11, 110). , 110) are formed at both ends of the plate (11, 110) as long holes having long sides in the longitudinal direction, and the needle-like protrusions (12, 120) are formed in the vicinity of the through holes (13, 130). ) Is the anchor tooth (1
21), and further, the plate (11, 110) is provided with a hole (14, 140) for fixing the position impactor (20, 30) in a substantially central portion thereof. Bone plate and hook. 2. The plate (11, 110) is a single plate having a shape that bulges in its longitudinal direction, and the plurality of needle-like projections (12, 120) are provided on the plate (1).
The osteosynthesis plate hook according to claim 1, wherein the osteosynthesis plate hooks are provided symmetrically in a pair with the through holes (13, 130) formed at respective ends of the (1, 110). 3. The needle-like projection (12, 120) is connected to the flat plate portion of the plate (11, 110) by a curved portion connected to the plate (11, 110) in a curved shape. The plate hook for osteosynthesis according to 2. 4. A plate hook for osteosynthesis according to claim 2, wherein the plate (11, 110) is manufactured by cold stamping and bending performed on a plate-shaped metal. 5. An osteosynthesis plate hook according to claim 2, wherein the plates (11, 110) are manufactured by a casting method. 6. The plate hook for osteosynthesis according to claim 1, wherein the plate (11, 110) is made of stainless steel or titanium. 7. A position impactor used in the plate hook for osteosynthesis according to any one of claims 1 to 6, wherein the needle-shaped projections are connected in a curved shape of the plate (11, 110). The pedestal (31) having a rectangular shape that fits the curved portion of the plate (12, 120) is provided, and the plate (11, 11) is provided substantially at the center of the pedestal (31).
0) screw holes (14, 14)
Position impactor with a shoulder rod (22) having a male threaded portion (33) of a size and pitch that matches the size and pitch of (0). 8. A position impactor for use in the osteosynthesis plate hook according to any one of claims 1 to 6, wherein the needle-shaped projections are connected to the plate (11, 110) in a curved shape. The pedestal (21) having a rectangular shape that fits the curved portion of the plate (12, 120) is provided, and the plate (11, 11) is provided at a substantially central portion of the pedestal (21).
0) screw holes (14, 14)
0) the end (221) having a size corresponding to the inner diameter, and
Rod with shoulder (22) equipped with hooks (25, 26) and forceps (23, 24) with arms (231, 241)
Is fixed, and the forceps (23, 24) has a shoulder rod (2) above the connecting shaft (27).
Positions characterized in that they are attracted to each other by a biasing device (28) interposed between the arms (231, 241) while being held in a hole (222) opened in 2). Impactor.