CN201426768Y

CN201426768Y - Malformed bone fixing plate

Info

Publication number: CN201426768Y
Application number: CN200920306312XU
Authority: CN
Inventors: 王其信; 史蒂文斯莫里斯·彼得
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-07-16
Filing date: 2009-07-16
Publication date: 2010-03-24
Anticipated expiration: 2019-07-16

Abstract

The utility model discloses a malformed bone fixing plate which belongs to devices for bone-knitting and comprises a 8-shaped fixing plate which has two bone peg through holes on the center line of the plate surface, wherein a guide hole is formed in the center of the fixing plate which is a straight panel, the bone peg through holes are slot holes win the same direction as the center line of thefixing plate, the upper portion of the slot hole on the top surface of the fixing plate is provided with a concave spherical surface, and the diameter of the concave spherical surface is the same as the diameter of the head portion of a bone peg, and the slot hole on the bottom surface expands outwards to lead the length diameter of the bottom slot hole is larger than the length diameter of the top slot hole. The malformed bone fixing plate has the characteristic of 'flat memory' and applies the self resilience property of 8-shaped plate material quality, thus the bone can be automatically straightened during malformed bone correction process, moreover, the hole shapes of the bone peg through holes are improved, thereby the mechanical stress formed when the fixing plates is combined with the bone pegs is overcome, and the embedded bone pegs are respectively outwards expanded 5 to 40 degrees in the slot holes of the fixing plate, thereby the phenomena such as the bending of the fixing plate and the breakage and damage of the bone pegs are thoroughly eliminated, and the bone can always get even corrective force during the growth process.

Description

Deformity bone fixing head

Technical field

This utility model relates to the device that is used for synthetism, specifically is a kind of lopsided bone fixing head.

Background technology

The method of orthopedic clinical treatment bone malformation disease is a lot, and nail nail method is that medical nail is fixed on around the growth plate, suppresses lopsided expandable bone.But, after a time, through regular meeting medical nail bending, fracture, mobile phenomenon take place, cause the patient to undergo surgery once more, bring misery to patient.

Chinese patent 2772457 discloses a kind of " lopsided bone fixing head ", its shape is the diplopore fixing head of 8 fonts, on the same axis in plate face two ends, be provided with the nail through hole, its plate face is 162 °-172 ° fixed angle surfaces approaching with bone shape face, plate face central authorities are provided with guide hole, and the nail through-hole surfaces on the plate face is provided with chamfering.This utility model has remedied fixedly fracture, mobile deficiency, two nails can be in the osteogenesis process bifurcated arbitrarily, can guide the lopsided bone normal growth can not weaken bracing force again.The diplopore fixing head can not rupture and move in correcting process.

But, because nail is vertically set in the screwing through hole of lopsided bone fixing head, the lopsided bone fixing head of prior art is used for lopsided bone when correcting, when bone growth arrives certain phase, two nails that can occur being fixed on the lopsided bone fixing head have reached the maximum limit that can separate angle, cause the mechanical stress between nail and the lopsided bone fixing head increasing; In addition, do not form uniform rotation between bone screw head sphere and nail through hole, cause nail loosening, the mechanical stress of its contact surface will cause bend fracture of lopsided bone fixing head or nail fracture damage, influences rectification effect; And the fixing head that forms 162 ° of-172 ° of fixed angle bendings has inhibition to some skeletal growth.

Summary of the invention

This utility model is exactly in order to address the aforementioned drawbacks, and a kind of lopsided bone fixing head of avoiding fixing head fixing head bending and nail fracture damage to occur after implanting lopsided bone is provided.

This utility model is realized by following technical scheme.

A kind of lopsided bone fixing head is included in the 8 word shape fixing heads that form two nail through holes on the centrage of plate face two ends, and fixing head central authorities are formed with guide hole; And described fixing head is straight plate, described nail through hole is the slotted hole consistent with the fixing head centerline direction, the concave spherical surface identical with the bone screw head diameter arranged at the end face slotted hole top of fixing head, and the bottom surface slotted hole of fixing head is outwards expanded, thereby makes the major diameter of the major diameter of bottom surface slotted hole greater than the end face slotted hole.

This utility model of using design like this carries out lopsided bone when correcting, and the plate of planar design has " plane memory " characteristic, has used the rebound performance of 8 letter stencil materials itself well, the stretching skeleton of active in lopsided bone correcting process; Owing to improved the hole shape of nail through hole on fixing head, overcome fixing head and nail in conjunction with the time mechanical stress that forms, the nail that makes implantation 5 °-40 ° of abductions in the slotted hole of fixing head, two nails can have enough big separately angle in the osteogenesis process, bending of potential generation fixing head and nail fracture damage phenomenon have thoroughly been eliminated, remedied the deficiency of rotational angle range, made skeleton in growth course, obtain uniform corrective force all the time, guaranteed the corrigent complete success of lopsided bone.

Description of drawings

Fig. 1 is this utility model top plan view structural representation;

Fig. 2 is that this utility model is looked up the planar structure sketch map;

Fig. 3 is a vertical profile structural representation of the present utility model;

Fig. 4 is the perspective view of this utility model user mode;

Among the figure: 1. fixing head 2. end face slotted holes

3. bottom surface slotted hole 4. guide holes

5. nail 6. heads

7. cervical region 8. concave spherical surfaces

9. chamfering 10. outer skew walls.

The specific embodiment

Below in conjunction with drawings and Examples this utility model is elaborated.

A kind of lopsided bone fixing head is included in the 8 word shape fixing heads 1 that form two nail through holes on the centrage of plate face two ends, and fixing head central authorities are formed with guide hole 4; And described fixing head 1 is straight plate, described nail through hole is the slotted

hole

2,3 consistent with fixing head 1 centerline direction, the concave spherical surface 8 identical with bone screw head 6 diameters arranged at the top of the end face slotted hole 2 of fixing head 1, the bottom surface slotted hole 3 of fixing head 1 is outwards expanded, thereby makes the major diameter of the major diameter of bottom surface slotted hole 3 greater than end face slotted hole 2.Form outer skew wall 10 between the outside of the outside of bottom surface slotted hole 3 and end face slotted hole 2.

The concave spherical surface 8 identical with bone screw head 6 diameters arranged at the top of the end face slotted hole 2 of fixing head, makes the sphere of nail 5 heads 6 cooperate rotation intact with it.In the bone growth process, avoid the two cooperation inconsistent, fixing head 1 fracture, the perhaps fracture damage of nail 5 that causes because of the mechanical stress of contact surface.

Described lopsided bone fixing head, its end face slotted hole 2 are that the radius circular hole fusion that waits in two centers of circle forms on the same centerline direction.

To be the first-class radius circular holes of same centerline direction form with merging with the isometric elliptical aperture of vertical minor axis for described lopsided bone fixing head, its bottom surface slotted hole 3.

End face slotted hole 2 and bottom surface slotted hole 3 can form the slotted hole shape, also can form " ∞ " shape, and still, the distance that waits radius circular hole fusion portion in two centers of circle should be greater than the diameter of nail cervical region 7, with obstruction free nail 5 free abductions.

Because due to fixing head end face slotted hole 2 shapes, the concave spherical surface 8 that end face slotted hole 2 tops are identical with bone screw head 6 diameters, outside breadth is narrow and be shallower than the inboard, guarantee nail 5 abductions after, concave spherical surface 8 cooperates with the sphere smoothness of head 6.

Described lopsided bone fixing head, the outside of the outside of its end face slotted hole 2 and bottom surface slotted hole 3 is 5 ° of-40 ° of angles at fixing head 1 planar central vertical line.Like this, make two nails 5 that pass end face slotted hole 2 and bottom surface slotted hole 3 respectively strengthen the angle of abduction, as bone malformation is corrected, make the nail 5 that implants freely separate angle up to 80 °, further eliminated the mechanical stress below the nail through hole of nail 5 and fixing head, thereby eliminated nail fracture and fixing head deformed damaged, guaranteed lopsided bone corrective therapy effect effectively.

Described lopsided bone fixing head, the two sides periphery of its fixing head 1 forms chamfering 9, avoids damaging surrounding tissue behind the fixing head 1 implantation health.

Described lopsided bone fixing head, its fixing head 1 adopts thick rustless steel of 1.5-2.5mm or titanium alloy plate to make.

A kind of lopsided bone fixing head is included in the 8 word shape fixing heads 1 that form two nail through holes on the centrage of plate face two ends, and fixing head central authorities are formed with guide hole 4; Described fixing head 1 is straight plate, described nail through hole is to form vertically to pass nail 5 on fixing head 1 centrage, also can outward-dipping 5 °-40 ° end face slotted hole 2, the bottom surface slotted holes 3 that pass nail 5, make two nails separate angle up to 80 °, the concave spherical surface 8 identical with bone screw head 6 diameters arranged at end face slotted hole 2 tops of described fixing head 1.

Claims

1. lopsided bone fixing head, be included in the 8 word shape fixing heads that form 2 nail through holes on the centrage of plate face two ends, fixing head central authorities are formed with guide hole, it is characterized in that described fixing head is straight plate, described nail through hole is the vertical slotted hole consistent with the fixing head centrage, be formed with the concave spherical surface that waits radius to justify around the end face slotted hole of fixing head, the bottom surface slotted hole of fixing head is outwards expanded, thereby makes the major diameter of the major diameter of bottom surface slotted hole greater than the end face slotted hole.

2. lopsided bone fixing head according to claim 1 is characterized in that described end face slotted hole is that the radius circular hole fusion that waits in 2 centers of circle forms on the same centrage.

3. lopsided bone fixing head according to claim 1 is characterized in that described bottom surface slotted hole is the first-class radius circular hole of same centrage and forms with merging with the isometric elliptical aperture of vertical minor axis.

4. lopsided bone fixing head according to claim 1 is characterized in that the outside of described end face slotted hole and the outside of bottom surface slotted hole are 5 ° of-40 ° of angles at fixing head planar central vertical line.

5. lopsided bone fixing head according to claim 1 is characterized in that the both sides side perimeters of described fixing head forms chamfering.

6. lopsided bone fixing head according to claim 1 is characterized in that described fixing head adopts 1.5-2.5mm rustless steel or titanium alloy plate to make.

7. lopsided bone fixing head according to claim 1, be included in the 8 word shape fixing heads that form 2 nail through holes on the centrage of plate face two ends, it is characterized in that described fixing head is straight plate, described nail through hole is to form vertically to pass nail on the fixing head centrage, also can outward-dipping 5 ° of-40 ° of slotted holes that pass nail, be formed with the concave spherical surface that waits radius to justify around the end face slotted hole of described fixing head.