CN2102729U

CN2102729U - Forced pressure bone setting plate

Info

Publication number: CN2102729U
Application number: CN 91227440
Authority: CN
Inventors: 刘克强
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-10-25
Filing date: 1991-10-25
Publication date: 1992-04-29

Abstract

The utility model belongs to an internal fixation instrument used for the treatment of human limb fracture, composed of a steel plate, a fixing and regulating bolt and fixing screws. Rake screws are arranged on both ends of the steel plate or one end of the steel plate. The steel plate is provided with a bolt hole and / or screw holes. Utilizing the theory of the structural mechanics and the material mechanics and according to the requirements of the biomechanics, the utility model has the characteristics of breaking resistance, bending resistance, twisting resistance, no breakage of the plate, no breakage and looseness of the screws, etc., and can guarantee that the reliable fixation and the compression of the folded end are accomplished synchronically, accelerating the contact-healing of the fracture. The utility model has the advantages of convenient operation, simple and reasonable structure and obvious effect.

Description

Forced pressure bone setting plate

This utility model belongs to medical apparatus and instruments, particularly a kind of internal fixation device that is used for the treatment of the human limb fracture.

The blade plate that is used for the treatment of the human fracture is generally fracture bone plate, divide a word with a hyphen at the end of a line hone lamella and pressurized bone plate, and for stainless steel is made, in treatment, the screw that passes on the blade plate with screw is connected with folding bone two ends, to reach the therapeutic purposes of synthetism.But, because they exist mechanical strength low, frangibility, thereby cause fracture dislocation distortion or need long-time fixing, problem such as perhaps partial fracture disunion and healing cycle be long.(being called for short AO) such as American-European scholar ME Millers thought, why the method for past treatment fracture internal fixation fails, mainly be in default of mechanical knowledge, proposed as long as static(al) (material prestressing force) is just firm greater than power (the function load-bearing is a human body gravity) internal fixation, but in practice, the generation screw fractures, becomes flexible and affects the treatment, and its pressurization technology is not only loaded down with trivial details but also very unreliable.Patent application CN86205674, CN86202946, CN86210065, CN8820525 discloses " new type auto compression steel plate " respectively, " the powerful multifunctional steel-plate of fracturing ", " long bone low stress, hone lamella resets, pressurizes ", " the horizontal type synthetism of rail mounted steel plate ", though they are improving to some extent aspect the elasticity of steel plate, the pressurization, but still exist the problems referred to above.

The purpose of this utility model provides a kind ofly to be had comprehensive mechanical performance and meets the biomechanics requirement, internal fixation is firm, the pressurization of doubling end reduces the folded block gap, be beneficial to fracture contact healing and overcome stress shielding, and anti-folding, bending resistance, anti-twist, simple and reasonable, easy and simple to handle powerful pressurized bone plate.

Realize that the purpose of this utility model is made up of steel plate and secured adjusted bolt and/or hold-down screw, harrow nail is arranged, bolt hole and/or screw hole are arranged on the steel plate at the two ends or an end of steel plate.

The transverse section of steel plate is curved, harrow nail is identical with steel plate cast solid and thickness, the interior angle of harrow nail axis and steel plate axis is 95 °-105 °, root is wide to be 2-4.5mm, the thick 1.5-3mm of steel plate, wide 10-20mm, the secured adjusted diameter of bolt are 1.5-4.5mm, and the hold-down screw diameter is 1.5-7mm.

Because this utility model has used structural mechanics and theory of mechanics of materials and has combined the requirement of biomechanics, it is simple and reasonable, use the outstanding effect and the advantage of its synthetism to be: 1, the reasonable diameter of rational width of curved plate and thickness and secured adjusted bolt or screw, its anti-folding, bending resistance, anti-twist etc. have been strengthened, its allowable stress is greater than actual holding capacity, strengthened the function weight capacity greatly, the phenomenon of disconnected plate, broken nail, nail pine can not take place; 2, under the effect of harrow nail and adjusting bolt or hold-down screw, guaranteed synchronous the realization fixed and pressurization of doubling end, overcome stress shielding, promoted the contact healing of fracture; 3, easy and simple to handle, do not need to add again external fixation or traction behind the internal fixation; 4, can make patient's early ambulant and taking care of oneself.

Further describe below in conjunction with embodiment accompanying drawing of the present utility model:

Fig. 1, the structural representation of this utility model embodiment 1;

Fig. 2, the secured adjusted bolt sketch map among Fig. 1;

Fig. 3 plays plate nail sketch map;

Fig. 4, the structural representation of this utility model embodiment 2;

Fig. 5, the internal fixation sketch map of embodiment 1;

Fig. 6, the internal fixation sketch map of embodiment 2.

Embodiment 1

As Fig. 1, shown in Figure 2, it is by steel plate 1, secured adjusted bolt 2 is formed, there is harrow nail 3 at the two ends of straight shape steel plate 1, steel plate 1 thick 1.5-3mm, wide 10-20mm, length is not limit, the cross section of steel plate 1 is curved, radius is generally 15mm, two of steel plate 1 has bolt hole 4 respectively, a side of a bolt hole 4 has had plate hole 5 therein, bolt hole 4, play the diameter of plate hole 5 and follow closely 6(referring to Fig. 3 with a secured adjusted bolt 2 and a plate respectively) match, during internal fixation, because bolt is subjected to the shearing maximum between steel plate and the bone, be the reason that causes screw to fracture, so the diameter of bolt 2 is generally 1.5-4.5mm by the position decision of body weight for humans and fracture, for the length that makes bolt 2 adapts to the diameter of bone and prevents bolt looseness, the steel wire on the employing bicycle and the method that spins of steel wire medicated cap make fixed length adjustable in the 15-20mm scope, and fixed; Angle is generally 95 °-105 ° in the axis of the axis of harrow nail 3 and steel plate 1, can reach doubling bone purpose fixing and that pressurize simultaneously like this, can make the folded block gap dwindle 3-6mm, for preventing that harrow nail from fractureing, with harrow nail 3 and steel plate 1 cast solid, thickness is identical with steel plate 1, and the wide 2-4.5mm that is generally of root (with steel plate 1 binding site) can decide according to the position of folding bone and patient's body weight.Wherein, play plate nail 6 and set up for removing the internal fixation blade plate easily, steel plate 1, bolt 2, harrow nail 3, to play plate nail 6 be that OGr18NiPTi or 1Gr18NiPTi or medical stainless steel are made.Present embodiment is suitable for the internal fixation of shaft fracture, fixed form as shown in Figure 5, the bolt hole 4 that secured adjusted bolt 2 passes on the steel plate 1 is connected with folding bone two ends, and harrow nail 4 hammers in the bone since between the nail point of harrow nail 3 apart from length greater than steel plate 1, after harrow nail 3 hammers in the bone, promptly the two ends of fracture are drawn over to one's side, add the fixing of adjusted bolt 2, realized pressurization and fixing synchronously, its operation is very easy, and is fixing very firm.

Embodiment 2

As shown in Figure 4, with embodiment 1 inequality be, steel plate 1 is a bent plate, crooked degree is according to the natural physiological situation and the internal fixation that is suitable for the epiphysis end of human body bone, end at web plate 1 has two harrow nails 3, two on the steel plate 1 has

screw hole

7 and 2 bolts hole 4 respectively, screw hole 7 is near a side of harrow nail 3, screw hole 7 matches with the diameter of screw 8, because the epiphysis end is thick and do not have a skeleton chamber, so suitably increasing the diameter of screw 8 is 1.5-7mm, to enlarge its contact surface, the number of buckleing that the length that increases screw 8 promptly increases its screw thread is generally more than 25, and general 30-60 is advisable, and the allowable stress that can realize bone like this is greater than the actual holding capacity of bone and prevent the loosening of screw, the buckleing number and can make multiple different model and specification of the diameter of screw 8 and screw thread thereof according to different weight and different parts situation, to be applicable to their internal fixation, present embodiment has not had plate hole and has played the plate nail, and their making material is identical with embodiment 1 with other version.Present embodiment is applicable to the internal fixation of epiphysis end folding, fixed form as shown in Figure 6, screw 8 is connected with folding bone two ends with bolt hole 4 with the screw hole 7 that secured adjusted bolt 2 passes respectively on the steel plate 1, harrow nail 3 hammers in the epiphysis, promptly the two ends of fracture are drawn over to one's side, realize pressurization synchronously with fixing, its operation is also very easy, and is fixing very firm.

Claims

1, a kind of powerful pressurized bone plate is characterized in that being made up of steel plate 1 and secured adjusted bolt 2 and/or hold-down screw 8, at the two ends or an end of steel plate 1 harrow nail 3 is arranged, and bolt hole 4 and/or screw hole 7 are arranged on the steel plate 1;

2, according to the described blade plate of claim 1, it is characterized in that harrow nail 3 and steel plate 1 cast solid, angle is 95 °-105 ° in the axis of the axis of harrow nail 3 and steel plate 1, the wide 2-4.5mm of the root of harrow nail 3, harrow nail 3 is identical with steel plate 1 thickness;

3, according to the described blade plate of claim 1, it is characterized in that steel plate 1 thick 1.5-3mm, wide 10-20mm, the transverse section is curved;

4,, it is characterized in that secured adjusted bolt 2 diameters are 1.5-4.5mm according to the described blade plate of claim 1;

5,, it is characterized in that set bolt 8 diameters are 1.5-7mm, the number of threads at least 25 according to the described blade plate of claim 1.