CN2404493Y

CN2404493Y - Arch bridge type resilient pediclus arcus vertebra fixation device

Info

Publication number: CN2404493Y
Application number: CN 99252572
Authority: CN
Inventors: 李超
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-11-01
Filing date: 1999-11-01
Publication date: 2000-11-08
Anticipated expiration: 2009-11-01

Abstract

The utility model relates to an arch bridge type elastic vertebra bow root fixing device and comprises two steel plates and four screw nails. The steel plate (1) is arc-shaped and is provided with a reinforcing rib (2), a one word hole (3) and a transverse arm connecting block (4). The hole (3) is matched with the screw nails (5), and the connecting block (4) is matched with a transverse arm screw bolt (6). The arch bridge type elastic vertebra bow root fixing device is used for elastically fixing the fracture of the lower thoracic vertebra and lumbar vertebra and has the fixing and returning double functions. The arch bridge type elastic vertebra bow root fixing device has the advantages of simple structure, high strength, high elasticity, no pine nail, no broken nail, convenient use and labor saving. The arch bridge type elastic vertebra bow root fixing device can complete the high quality operation at the moment to cause a patient to get well soon.

Description

Arch (bridge) type elasticity fixation of pedicle device

This utility model relates to nail-plate flexible fastening utensil in the medical apparatus and instruments, exactly is a kind of arch (bridge) type elasticity fixation of pedicle device.

The lumbar vertebra of human body all has natural physiologic radian (physiology lordosis), and the major part that supports human body is vertebral body.Wound causes lumbar vertebra fracture to refer to promptly that vertebra is compressed with vertebral body is impaired breaking, with the kyphosis deformity of anti-physiologic radian, also can turn round mistake mutually between vertebra when serious simultaneously.Clinical treatment adopts Si Difu (Steffee) steel plate holder mostly at present.One pair of such holder comprises two blocks of onesize rectangle steel plates and four onesize screws.Symmetrical distribution seven is used for matching with two screws to (14) nail hole on every block plate.Seven pairs of nail holes all process the conical surface and are used for matching with the nut that has tapering on the aperture of the same side.It is shaped as a rectangle when two screws are fixed on the block plate symmetrically.

Clinical practice shows that the Si Difu steel plate has following defective: one, fixing back does not have multiple effect to vertebra, promptly can not recover the inherent natural physiologic radian of lumbar vertebra, do not have anti-rotation performance when turning round wrong situation relatively and make it to reset when having between vertebra, because two block plates are separately independently.Two, steel plate is yielding, and screw is easily loosening, the time have the broken nail accident to take place, thereby the fixation of losing.

Arch (bridge) type elasticity fixation of pedicle device provided by the utility model is intended to overcome the defective of Si Difu steel plate, lumbar vertebra compression fracture is had concurrently dual function fixing and that reset, thereby obtain better clinical effectiveness.

The technical solution of the utility model realizes by the improvement to the Si Difu steel plate.Specifically improve in the following aspects.

1, according to the natural physiologic radian of human vertebrae straight steel plate is designed to have the arch of certain radian, and on the both sides of its concave surface one side a reinforcement is set respectively, such armor plate strength height had both had elasticity, can not be out of shape again.

2, be symmetrical arranged a pair of bilateral three conical surfaces one word hole on every block plate, its connotation is: the hole is " one " word shape, the stage casing is a rectangle, two ends are semicircle, length direction along a word hole respectively processes symmetric three onesize taper seats on the convex-concave two sides in aperture, the taper seat on two sides is to the top.The hole is used for passing screw, and the conical surface is used for the nut that the same side has a tapering and matches, make nut and steel plate closely locking be difficult for loosening with trip bolt.

3, every screw must can be fixed on the steel plate with two nuts.In this utility model, wherein a nut is cast as one with screw, reduced the chance of screw loosening on the one hand, use when the more important thing is operation impact wrench just can be not only accurately but also easily with screw in pedicle of vertebral arch place screw-in vertebral body, demolition is as the same.

4, in the Si Difu steel plate, the screw rod of screw is the identical cylinder of diameter up and down.It is improved to the assembly of round platform and cylinder in this utility model, the screw rod that is about to nut one side is processed the round platform with certain taper, and the embedding and the demolition of screw are more laborsaving when making operation.

5, for the vertebra of turning round mistake is resetted, independently should fix between the steel plate separately for two.The transverse arm contiguous block of an inclination respectively is set on two block plates for this reason, by a transverse arm bolt that two block plates and Intrapyramidal four screws of embedding are firmly fixing, make this holder have anti-rotational ability.

Fig. 3 is the schematic side view of this utility model user mode.A visible block plate and two one of screw formations are fan-shaped among the figure.The convex surface of steel plate is back protruding corresponding with spinal fracture, make this convex surface constitute the mechanics fulcrum P that the folding top that stretches resets to protuberance position, impaired vertebra (rear pillar) back, under the effect of screw, before making compressed vertebra, center pillar produces tension force, utilize the forward and backward longitudinal ligament traction of the vertebral body reduction of the fracture, to recover the height of anterior margin of vertebral body, force the protruding puncture forward in back simultaneously, make vertebra recover normal physiology lordosis.F is vertical vertical compression load among the figure, and this power is decomposed by screw, and obviously F2＜F helps vertebra and resets.

Fig. 4 is the schematic top plan view of this utility model user mode.Two screws are separately fixed on two block plates among the figure, but are embedded in the same vertebra, and pedicle embeds vertebral body.When fracture and turn round wrong mutually between with vertebra and during the rotation displacement situation, concerning the Si Difu holder, after fixing, about two block plates with relative displacement, lack anti-rotational ability, can not the keeping parallelism state.Concerning this utility model, about two block plates interconnect and lock by the transverse arm bolt, guarantee that it must not displacement, keep substantially parallel state, this just makes this holder obtain anti-rotational ability.Analysis chart 4 as seen, why two contiguous blocks will tilt, and are because two pedicles of vertebral arch and non-parallel and an angle arranged, two contiguous blocks just can make the axis of its through hole and transverse arm bolt overlap substantially after tilting, and so just play connection and locking action.

By analysis, as seen the utlity model has dual function fixing and that reset to Fig. 3 and Fig. 4.The arch steel plate is indeformable, and intensity height and tool elasticity are applicable to down the flexible fastening of thoracic vertebra and lumbar vertebra fracture.This not only can shorten the length of patient stay, and the functional rehabilitation after also helping the patient and leaving hospital is taken exercise, and makes the patient be able to early recovery.This utility model is simple in structure, and handling ease is easy to use, can guarantee the quality and the success rate of performing the operation, and in clinical practice, screw loosening or broken nail accident take place none example.

Fig. 1 is a structural representation of the present utility model, and to analyse and observe be to amplify at 2: 1 for A-A, B-B among the figure.

Fig. 2 is a screw, the structural representation of transverse arm bolt and nut.

In conjunction with the accompanying drawings 1 and 2, non-limiting examples of the present utility model is described below.

Select 317# medical stainless steel material, as shown in Figure 1:

Steel plate 1 is one section circular arc, arc length 80-90mm, wide 17mm, thick 5mm.The pairing central angle of arc is 20-30 °, and the physiologic radian of this angle and human vertebrae adapts.Respectively there is a reinforcement 2 on the both sides of its concave surface one side.

On steel plate 1, be processed with symmetric two bilaterals, three vertebra faces one word hole 3.The hole is " one " word shape, and the stage casing is a rectangle, and two ends are semicircle, and the diameter of semicircle is exactly orthogonal wide.The hole is used for passing screw.Length direction along the hole on the aperture, convex-concave two sides in hole respectively processes three 45 ° onesize taper seats, and three taper seats on the two sides are symmetry one by one.This conical surface is used for matching with the corresponding tapering of nut one side, is difficult for loosening with fastening pedicle nail (abbreviation screw).Human body height difference can be according to three fixed positions of the corresponding adjustment screw of the conical surface.

Arc top at steel plate 1 is in the transverse arm contiguous block 4 that concave surface one side is fixed an inclination, and its inclination angle is 15 °, and this angle with two pedicles of vertebral arch adapts.Have through hole 9 on contiguous block 4, the diameter in this hole matches with the diameter of transverse arm bolt 6, is used for putting transverse arm bolt 6.Also be processed with 45 ° taper seat on the aperture, two sides of through hole.Have rectangular channel 10 above through hole 9, the effect of this groove is the fixing and demolition that makes things convenient for transverse arm bolt 6.Rectangular channel 10 has two functions, one, this separation are 5mm, with through hole 9 diameters (6mm) gap 1mm, transverse arm bolt 6 is put into the method for through hole 9, should earlier the path (5mm) of transverse arm bolt 6 be located to put into through hole 9 through rectangular channel, and then half-twist, make transverse arm bolt maximum diameter (6mm) corresponding with rectangular channel, can prevent that transverse arm bolt 6 from going out from the rectangular channel slippage.Its two, transverse arm bolt 6 can directly be put into through hole and need not to pass across through hole from this groove.Then need at the additional cross sections of patient's body surface corresponding site if cross through hole,, increased patient's misery though this increases together and uncomplicated formality only for operation.

As shown in Figure 2:

One hex nut 7 cast solid is with it arranged on the bolt of screw 5, nut 7 and the same specification of other nuts, one side also processes 45 ° of taperings, its effect is the chance that reduces screw loosening on the one hand, can use on the other hand impact wrench with screw in the pedicle of vertebral arch place screws in vertebral body, not only laborsaving, and quick and precisely, can not wander off, to save operating time.Nut 7 has the bolt of tapering one side to be cylinder, and there is screw thread on the surface, long 15mm, and φ 5mm, match in same word hole 3.The bolt of nut 7 opposite sides is Rotary-table, and there is screw thread on the surface, long 40-45mm, and front end φ 6mm, root φ 6.5mm, this section is embedded in pedicle of vertebral arch and the vertebral body.

Transverse arm bolt 6 one ends have hex nut, and this nut one side also has 45 ° of taperings.The long 65mm of bolt is the cylinder of four faces, and symmetric two faces are the plane, thick 5mm, and another symmetric two faces are cambered surface, there is screw thread on the surface, φ 6mm.

Hex nut 8 one side opening mouths all have 45 ° of taperings, external diameter 10mm, thick 6mm.The same screw 5 of internal diameter 5mm matches, and the same transverse arm bolt 6 of internal diameter 6mm matches.

Claims

1, a kind of arch (bridge) type elasticity fixation of pedicle device is made of two block plates and four screws, it is characterized in that:

(1), steel plate (1) is curved, the both sides of its concave surface one side respectively are provided with a reinforcement (2), also be processed with symmetric two bilaterals, three conical surfaces one word hole (3) on it, arc top bit in concave surface one side is provided with a transverse arm contiguous block (4) that tilts simultaneously, the through hole (9) that matches with transverse arm bolt (6) is arranged on the contiguous block (4), and through hole (9) top has rectangular channel (10);

(2), the nut (7) that forms one is with it arranged on the screw rod of screw (5), the screw rod of nut (7) one sides is cylinder, and the screw rod of opposite side is Rotary-table;

(3), the end transverse arm bolt (6) that has a nut is cylinder, and four faces are arranged, symmetric two faces are planes, another symmetric two faces are screwed cambered surfaces.