CN200963180Y

CN200963180Y - Counterclockwise anchoring open-type self-locking marrow nail

Info

Publication number: CN200963180Y
Application number: CN 200620097584
Authority: CN
Inventors: 蔡钧; 白祥军; 张干庭
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-06-27
Filing date: 2006-06-27
Publication date: 2007-10-24
Anticipated expiration: 2016-06-27

Abstract

The utility model discloses a converse-anchoring propping up auto-lock intra-marrow nail, which comprises two parts including a nail body and a central rod, wherein the nail body is a hollow tube and provided with a lock/nail hole as well as an interlock hole, the proximal end of the central rod is provided with an axial screw thread traction device, and the far off end is provided with anchoring nails that is in movable matching and arranged inside the hollow cavity of the nail body. When the central rod is withdrawn out of the nail body, anchoring joints automatically prop up, run through the anchoring holes and are fixed on both sides of the bone tissue. The utility model overcomes the problem of the intra-marrow nail in the prior art such as the tiresome installation, severe side damage, the broken nail, and the fractures that do not heal up, while providing a far-off end propping up auto-lock intra-marrow nail with easy implantation and easy removal, simple structure, strong anti-spiral torque, and the stable dynamic characteristics.

Description

Grappling bracing type self-locking intramedullary nail drives in the wrong direction

One, technical field

This utility model belongs to a kind of orthopedic instrument, relates in particular to a kind of intramedullary pin for the treatment of fracture.

Two, background technology

Limb fracture is treated in the especially fracture of leg treatment, and sequela such as fracture delayed union, disunion or malunion easily take place malpractice, influence therapeutic effect.On limb fractures such as treatment femur, adopted comparatively advanced intramedullary pin technology and equipment in recent years, intramedullary pin belongs to fracture internal fixation technology, this technology adopts intramedullary pin to add diagonal or walk crosswise pinning, make it to form an integral body with whole long bone, can control the rotation and the shearing of fracture end to a certain extent, prevent that fracture from rotating displacement, thereby expand to the indication of intramedullary pin comminuted, grow the fracture at oblique and femur two ends etc., increased the stability of fracture fixation, improved the union of fracture rate, reduced infection rate, for treatment of fractures has increased a kind of biological method that more meets.But still there is following defective in practice: the 1. present pre-designed various misalignment angle of interlocking intramedullary nail far-end sighting system, and actual each patient's long bone of limbs angle of bend is not quite similar, and then can cause the far-end aiming to be failed as individual angle variation is excessive; 2. intramedullary nail with lock must increase operative incision because pinning is positioned at the two ends of long diaphysis, and the complex operation of pinning is installed, and secondary damage is big; 3. in the operation, the distance that swings with main locating rod because of intramedullary pin changes, and height gauge can not accurately be located, cause locating hole on locking of intramedullary nail and the main locating rod not on same plane, thereby often cause the boring failure, need again the boring down of CT or X-ray, both prolonged operating time, increase operating difficulty, also can influence surgical effect; 4. intramedullary pin and corresponding pinning do not have afterburning effect to fracture line, still may become flexible even stagger after fracture is fixing, thereby fracture gap is strengthened, and are unfavorable for union of fracture; 5. the fixing back formation of intramedullary pin and corresponding pinning firm static is fixed, thereby produces stress concentration on intramedullary pin and corresponding pinning, causes the fracture of intramedullary pin or corresponding pinning; And firm static fixes, and because of the relation of elastic modelling quantity, fracture produced stress shielding, causes nonunion.In recent years, in order to address the above problem, people have taked many methods.As being a kind of setscrew type self-marketing intramedullary pin of CN2516116 and being a kind of setscrew type self-locking intramedullary nail of CN2576189 in the publication number of July 13 calendar year 2001 application in the publication number of application on March 6th, 2002 by people such as the Xinghua City Zhang Wenxiang of Jiangsu Province, by people such as the Hou Qing of Shandong Jining Hospital of Chinese Medicine loyalty in the publication number of December in 2003 10 applications be a kind of femur of CN2659365 smart grand between the fixing compound interlocking intramedullary nail of self-locking, is the patented technologies such as setscrew type self-locking intramedullary nail of CN1631326 by GuangZhou, Guangdong Province city comrade Pan Tao in the publication number of December in 2004 application on the 30th, though they have obtained significant progress than prior art, be difficult to the firm pressurization of fracture site but still exist, and bulkhead nut and two ends, double-screw bolt control head office, center, because the pulp cavity complications cause rotating and the advance and retreat difficulty, both be unfavorable for the operation implantation, also be unfavorable for taking out pinning after the recovery from illness, even cause implant surgery failure or major part tapered cup nut to break away from fully from control centre's double-screw bolt dropping in the pulp cavity, increase the misery of taking out operating difficulty and patient.

Three, summary of the invention

The purpose of this utility model provide a kind of perform the operation implant and take out all be easy to, simple in structure, anti-turn-knob square is powerful, unstressed concentrates and stress shielding, have the fixedly opening type intramedullary nail of characteristics of power shape.

The technical solution of the utility model is a kind of retrograde grappling self-locking opening type intramedullary nail, this opening type intramedullary nail comprises nail body and center-pole, described nail body is a hollow tubular, offer locking nail hole and be furnished with self-locking nail on the nail body near-end, offer anchor hole and grappling nail outlet diagonal baffle plate on the tube wall of nail body far-end is vertical; Described center-pole comprises grappling joint far-end and screw thread axial traction near-end, clearance fit is in the hollow pipe of nail body, the far-end of center-pole is provided with grappling joint and grappling nail, grappling nail can be the V word and prolong that the longitudinal axis is reverse to strut and pass nail body anchor hole, grappling joint and grappling nail and center-pole are interconnected to form the union body that can rotate synchronously and move, and near section of center-pole is provided with screw-type axial traction device.Near section screw-type axial traction device of center-pole is made up of the firm nut baffle plate on the firm screw thread of center-pole near-end, fastening nut and the nail body.

Good effect of the present utility model is: owing to simply the grappling joint is made the union body that can rotate synchronously and move with center-pole, and screw-type axial traction device is set in the nearly section of center-pole, avoid grappling joint and grappling nail to fall fully, both helped performing the operation after the operation implantation also helps fully recovering and taken out from center-pole; Both eliminated the fixing stress concentration that self-locking nail is produced of firm static, it is fixing to the stress shielding of self-locking nail to fracture also to have eliminated traditional firm static; Both eliminate the generation of broken nail accident, also prevented the disadvantage of nonunion.

Four, description of drawings

Fig. 1 is this utility model nail body structure sketch map;

Fig. 2 is this utility model center-pole structural representation;

Fig. 3 withdraws from for this utility model center-pole and self-locking intramedullary nail structural representation during by fixed by nut;

The grappling pin drew the self-locking intramedullary nail structural representation that also is contained in nail body head end in when Fig. 4 entered the nail body for this utility model center-pole.

Among the figure, 1 is the grappling joint, and 2 is center-pole near-end binding thread, and 3 is fastening nut, and 4 is center-pole, 5 are the nail body, and 6 are nail body near-end, and 7 is locking nail hole, and 8 is self-locking nail, 9 is the fastening nut baffle plate, and 10 is anchor hole, and 11 are grappling nail outlet diagonal baffle plate, and 12 are the grappling nail.

Five, the specific embodiment

When implementing this utility model, nail body 5 can be changed a social system with the seamless medical stainless steel pipe of hollow or with existing approved product percussopunctator, main body nail near-end 6 is provided with locking nail hole 7, and on the tube wall of its far-end is vertical, offer anchor hole 10 and grappling nail outlet slanting baffle 11, the near-end of center-pole 4 is provided with binding thread 2, its far-end is provided with grappling joint 1 the grappling nail is interconnected to form the integral body that can rotate synchronously and move, places in the nail body 5.In the operation, only need to open an art mouth, will follow closely body 5 and insert in the bone marrow, and be fixed on the thigh bone by self-locking nail 8 and locking nail hole 7 in the fracture proximal end.Near-end at center-pole, by box spanner, easily rotate the nut 3 of screw-type axial traction device, center-pole 4 is prolonged moved axially, grappling nail 12 passes in the anchor hole 10 of following closely body 5 and struts strong and powerfully on the pulp cavity inwall, and swing offset between the two ends effectively prevents to fracture.And implant and operation when taking out in operation, as long as open an art mouth at near-end, just can effective nearby Control Shaft to traction apparatus, be difficult to the disadvantage of implanting or taking out thereby solved conventional expanded formula intramedullary pin fully.

Claims

1, a kind of retrograde grappling bracing type self-locking intramedullary nail, comprise nail body (5) and center-pole (4), it is characterized in that: described nail body (5) is a hollow tubular, offer locking nail hole (7) and be furnished with self-locking nail (8) on the nail body near-end (6), offer anchor hole (10) and grappling nail outlet diagonal baffle plate (11) on the tube wall of nail body (5) far-end is vertical; Described center-pole (4) comprises grappling joint far-end and screw thread axial traction near-end, clearance fit is in the hollow pipe of nail body, the far-end of center-pole is provided with grappling joint (1) and grappling nail (12), grappling nail (12) can be the V word and prolong the reverse anchor hole (10) that struts and pass nail body (5) of the longitudinal axis, grappling joint (1) and grappling nail (12) are interconnected to form the union body that can rotate synchronously and move with center-pole (4), and near section of center-pole (4) is provided with screw-type axial traction device.

2, retrograde grappling bracing type self-locking intramedullary nail according to claim 1 is characterized in that: near section screw-type axial traction device of center-pole (4) is made up of the fastening nut baffle plate on center-pole (4) near-end binding thread (2), fastening nut (3) and the nail body (5).