CN2032862U

CN2032862U - Shape memory metal backbone orthopedics internal fixator

Info

Publication number: CN2032862U
Application number: CN 88213320
Authority: CN
Inventors: 姜延洲
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-09-01
Filing date: 1988-09-01
Publication date: 1989-02-22

Abstract

The utility model relates to a shape memory metal backbone orthopedics internal fixator. A cylinder is made of a double passage memory metal (such as the nickel-titanium alloy), and at least two cramping apparatus used to fasten the vertebra are installed on the vertebral body; the cramping apparatus are smoothly connected with the cylinder at low temperature, and fixedly connected with the cylinder at high temperature. The shape memory metal backbone orthopedics internal fixator has the advantages of simple production process, convenient operation, high reliability and the orthopaedic reactive force (such as pull, press bending, turn, etc).

Description

Shape memory metal backbone orthopedics internal fixator

This utility model relates to and a kind ofly is used for the treatment of that spinal bone is torn open, the backbone correcting and the internal fixation device of tumor, tuberculosis and the bow-backed deformity of scoliosis etc., particularly relates to a kind of backbone correcting and internal fixation medical treatment device made from shape memory metal.

Spinal column must have upright and heavy burden function, because certain disease, make spinal column lose this function, therefore need or replace this function with a kind of apparatus recovery, existing orthopedic generally is that the cylinder of employing medical stainless steel is a supporting body, and connecting spinal column is to adopt multi-form screw and hook, and main existing problems are to use inconvenience in performing the operation, fracture and loosening takes place in operation back easily, is not suitable for the treatment of severe deformities.The typical case of apparatus is the HARRINGTONShi inner fixer in the employing, and its cylinder is the ratchet post, on collude with C shape ring and be stuck on the ratchet post, collude on this and the distance of predetermined fixed between colluding at the end of cylinder bottom determined by the position of mobile C shape ring on cylinder.Fatigue fracture takes place along with the motion of human body produces stress concentration in ratchet place that this apparatus shortcoming is a cylinder easily.The cylinder of LuqueShi internal fixation device is the garden rod, and it can only produce horizontal resistant to bending stresses, can not produce axial tension and support force.Above-mentioned two kinds of apparatuses all can not prevent rotation.

The purpose of this utility model provides a kind of low temperature mutually for flexible, and high temperature is rigidity mutually, and the temperature variant cylinder inner fixer of shape.

Another purpose of the present utility model is the shortcoming that overcomes above-mentioned existing inner fixer, a kind of convenience is provided and strong can power the cylinder and relative grip device of and internal fixation orthopedic at three-dimensional.

Major technique of the present utility model is characterized as, on two-way shape memory metal carrying cylinder, two anchor clamps that are used for the clamp ridge spinous process of the seventh cervical vertebra are installed at least, annexation between anchor clamps and the cylinder is, closely be fixed on the cylinder at the high temperature phase time, be slidingly connected at low temperature phase time anchor clamps and cylinder, the treatment of distance between anchor clamps and the anchor clamps and position and spinal fixation adapts.

This utility model is the device that adopts the backbone correcting kind internal fixation of two-way shape memory metal making.The name of this memory metal as can be by elementary composition alloy such as nickel, titanium, it has under lower temperature soft plasticly, and presents the character of rigidity and shape memory under higher temperature.(about the detailed knowledge of memory metal, can be referring to relevant books and money melt).Adopt said apparatus, can make operation be convenient to operation, fixing strong, be applicable to the treatment of various serious deformities of spine.Solve existing inner fixer frangibility simultaneously and become flexible the problems such as correcting power is single that reach.

Below in conjunction with accompanying drawing this utility model is further described.

Fig. 1 is the annexation sketch map of this utility model critical piece.

Fig. 2 is the perspective view of anchor clamps.

Fig. 3 is the perspective view that further specifies to Fig. 2 anchor clamps.

Fig. 4 be among Fig. 1 joint sleeve at the perspective view of high temperature phase.

Fig. 5 be among Fig. 1 joint sleeve at the perspective view of low temperature phase.

Fig. 6 is that this utility model uses at epispinal sketch map.

Fig. 7 is used for the fixed screw front view of vertebral body

Fig. 8 is the vertical view of Fig. 7.

In the embodiment shown in fig. 1, two joint sleeves and two anchor clamps are housed at least on the Nitinol cylinder.The structure of joint sleeve 3 and anchor clamps 2 is seen Fig. 4,5 and 6 respectively.

Anchor clamps 2 are divided into the clamping part 8 that is connected with cylinder and the hook part 7 of spinal fixation bone, clamping part 8 can be a cuboid, have through hole 6 thereon along the longitudinal, having fixing anti-spin slot 4 with the recessed of hook part 7 to an opposite end, have a groove 5 on the side relative with the hook part, through hole 6 is connected with groove.

Joint sleeve 3 comprises base plate 9 and sleeve pipe 10, and the bottom opening of sleeve pipe 10 is communicated with hole on the base plate 9.Top 11 has wedge shape claw-like mouth.Joint sleeve adopts the two-way shape memory metal to make.

Fig. 3 is the structure chart of the anchor clamps 22 of another embodiment of the present utility model, and it has clamping section public 28 and hook part 27 equally, has through hole 26 on the cuboid of clamping part 28.Anchor clamps 22 also are to make with round trip memory metal such as Nitinol.

Screw 12 shown in Figure 7 is used for and will comprises threaded portion 13 and top 14 for making cylinder 1 be fixed on spinal bone screwing 12, the structure of the clamping part 8 of top 14 and anchor clamps 2 is identical, promptly on the cuboid at top, vertically have through hole along it, on an end face, have holddown groove, on the end face relative, have groove with threaded portion 13.

Memory metal part of the present utility model should be handled and round trip variation training through shape memory, makes it be flexible state at low temperature phase time cylinder 1, and it is big that the diameter of sleeve pipe 10 becomes, and the aperture at top 11 is identical with sleeve pipe, and the diameter change of the through hole 26 of anchor clamps 22 is big; At the high temperature phase time, cylinder 1 is a rigidity, and the diameter of sleeve pipe 10 diminishes, and top 11 is open melon shape, and the diameter of the garden shape through hole 26 of anchor clamps 22 diminishes.In addition at the low temperature phase time, the diameter of through hole 6 is greater than the external diameter of sleeve pipe 10, the internal diameter of sleeve pipe 10 is greater than the diameter of cylinder 1, the width of groove 5 is greater than the diameter of cylinder, the size of fixing anti-spin slot 4 matches with the size of base plate 9, make joint sleeve 3 after inserting anchor clamps 2, joint sleeve 3 can prevent that anchor clamps 2 from rotating with respect to cylinder 1.The concrete grammar of realizing above-mentioned requirements is the technology that those skilled in the art realizes easily, so do not give unnecessary details.

Using method of the present utility model is: according to preoperative diagnosis and surgical planning, the joint sleeve 3 of required number is contained on the cylinder 1 of certain-length; To install telescopic cylinder 1, to insert in low-temperature normal saline or the liquid nitrogen cooling standby.After anchor clamps 2 being fixed on the corresponding site of spinal column, in wound, place low-temperature normal saline, in hypothermic saline, cylinder 1 is pressed in the hole of anchor clamps through groove 5, and mobile joint sleeve 3, the relevant position that makes it to insert anchor clamps 2; After treating orthopedic satisfaction, change hypothermic saline into the warm saline approaching with body temperature; Cylinder 1 and joint sleeve 3 are abnormal in the distortion of high temperature phase time, and the internal diameter of sleeve pipe 10 diminishes and cylinder forms interference fit, and sleeve pipe 10 closely is fixed on the cylinder 1; Open on the top of sleeve pipe 10 simultaneously, side one end of chucking cuboid 8, other end at cuboid 8, base plate 9 and fixing anti-swivelling chute 4 match, make anchor clamps 2 and joint sleeve 3 vertically fixing, and realized orthopedic and fixation on the three-dimensional of anchor clamps 2 and cylinder 1, as shown in Figure 6.

The using method of another embodiment of this utility model is: moulding in advance cylinder 1 and anchor clamps 22 are taken out from low-temperature normal saline or liquid nitrogen, put into the wound that contains low-temperature normal saline, in hypothermic saline, cylinder directly inserted in the hole, vertical garden that anchor clamps are complementary, after treating orthopedic satisfaction, hypothermic saline is replaced with warm saline, makes cylinder and anchor clamps directly fastening.And do not place joint sleeve between it.

In order to make the more strong spinal column that firmly fixes of cylinder, can on vertebral body, settle screw.The top 14 of screw is identical with cooperating of cylinder with anchor clamps 2 with the cooperation of cylinder 1.Screw and fixedly the equal applicable shapes memorial alloy of hook make.Adding man-hour, should make the size of the diameter of cylinder, but the numerical value of interference should not surpass 8% of sleeve pipe or memory anchor clamps aperture greater than sleeve pipe or memorial alloy anchor clamps aperture.

Below only be to exemplify to of the present utility model, in the concept that is no more than this utility model content, can make many variations or improvement, also can adopt memory metal nail and the hook with multi-form shape as hook and screw, the fixed form of cylinder and spinal column also can adopt the memorial alloy anchor clamps and the plug-in unit of other modes.

Claims

1, a kind of device that is used for backbone correcting and internal fixation.It is characterized in that on two-way shape memory metal carrying cylinder, two anchor clamps that are used for fastening bone are installed at least; Annexation between anchor clamps and the cylinder is: be slidingly connected at low temperature phase time anchor clamps and cylinder, fixedly connected with cylinder at high temperature phase time anchor clamps, distance between anchor clamps and the anchor clamps and position and the treatment that will clamp spinal column adapt.

2,, it is characterized in that anchor clamps are fixed on the cylinder by the memory metal joint sleeve and or memorial alloy anchor clamps and cylinder are directly fixed according to the described inner fixing device of claim 1.

3, the inner fixing device of describing according to claim 2, it is characterized in that anchor clamps comprise clamping part and hook part, on the cuboid of clamping part, longitudinally have through hole, having holddown groove with the recessed of hook part to an opposite end, on the side relative with the hook part groove is arranged, through hole is communicated with groove.

4,, it is characterized in that joint sleeve comprises base plate and sleeve pipe according to the described inner fixing device of claim 2.Hole on telescopic bottom and the base plate is communicated with, and the top has wedge shape claw-like mouth.

5, according to the described inner fixing device of claim 1, it is characterized in that anchor clamps comprise clamping part and bolt portion, on the cuboid at the top of clamping part, longitudinally open the garden through hole, on the end face of clamping part, have holddown groove, on the end face relative, have groove with threaded portion.