CN2354515Y - Self-locked pressing intramedullary nail - Google Patents

Abstract

The utility model relates to a self-locked pressing intramedullary nail which is a bone surgery surgical instrument for curing fracture of the femoral bone, the tibia and the humeral shaft. The nail is made of a shaped stainless steel seamless pipe, and a pair of cross rotation self-locking arms is arranged at a nail nip part. Simultaneously, a self-locking post that can be inserted in the central hollow cavity of the nail and a pair of nail tail rotation self-locking arms are also matched, and a self-locking screw which can be screwed in a screw thread inner cavity arranged at the end of the nail is also arranged. The intramedullary nail is suitable for the two thirds fracture of the middle of the backbone, non-connection of the bone, bone malformation and bone extension. The fracture can be firmly fixed, and the operation technique program can be simplified. The patient and the medical personnel can be prevented from contacting with the X-ray, and the pulling nail is convenient, and the self-locked pressing intramedullary nail is superior to intramedullary nail having a lock at home and abroad.

Description

Pressurization self-locking intramedullary pin

This utility model relates to medical apparatus and instruments, especially for the intramedullary pin device of treatment femur, tibia, humeral fracture.

So far, treatment fracture intramedullary pin commonly used has V-type, quincunx intramedullary pin and various intramedullary nail with lock.V-type and quincunx intramedullary pin can only be used for key isthmus fracture, prevent the weak effect of rotation, separation and the cripetura of fracturing, and the intensity of following closely self is also poor.In order to overcome above shortcoming, develop over nearly 30 years, used and a kind ofly walked crosswise screw and pass bone and the fixed intramedullary nail with lock of intramedullary pin by inserting 1 to 2 piece of far away, the nearly two ends of fracture, can control support stress, bending stress, shear stress and the distorting stress of fracture, obviously increased the operation indication of intramedullary pin, basically discarded V-type and quincunx intramedullary pin, but intramedullary nail with lock there is following shortcoming: be equipped with the special-purpose operation table of tv x-ray machine, orthopaedics, special pinning guiding apparatus; Need the traction of row bone before the art; Will be outside cortical bone to walk crosswise with 2 to 3 pieces that screw accurately is inserted in the lockhole respectively be very difficult in the interlocking hole of walking crosswise at these intramedullary pin two ends, though there is the help of TV X level machine and localizer to still have the possibility of failure, the time of required operation is long, the patient contacts a large amount of X ray with the patient in art, patient and patient are worked the mischief; To can insert pinning after otch appears bone respectively again at the two ends of far away, nearly fracture site in the operation, cause more operation wound to the patient.Though number of patent application makes the insertion of distal locking screw more easy for " locked Intramedullary nail with fish-mouth-shape " of " 92213018.3 ", but still can not overcome above other shortcoming.Number of patent application is " the full lock intramedullary pin " of " 93225392.X " though do not need to be equipped with tv x-ray machine in the operation and the special-purpose operation table of orthopaedics, the pinning location is inserted more or less freely, but need to cause fracture damaged artificially in the operation, windowing can be from position damaged, definite lockhole of windowing, reduced the stability of bone self artificially, owing to have horizontal perforation to form a plurality of areas of stress concentration in the middle of it, reduced the bending strength of nail, have and cause following closely the danger that fractures, operation technique is more complicated still, and operating time is long.

In order to overcome above technical deficiency, the purpose of this utility model provides a kind of pressurization self-locking marrow formula intramedullary pin, in the medullary cavity of bone upper/lower terminal, produce nail bone interlocking fixation voluntarily, reach and simplify intramedullary nail with lock operation technique program, shorten the purpose of operating time.

Pressurization self-locking intramedullary pin comprises that a cross section is the pipe column, both sides have groove, central authorities for hollow metallic rod, is divided into tail, body, sharp three parts.It is characterized in that having the vertical shape groove that both sides connect in the hypomere and the nail tip of intramedullary pin afterbody, pair of cross rotary self-locking arm is installed in the vertical shape groove of tip, being furnished with one simultaneously can freely insert and take out in the nail tail, body central hollow intracavity, by snake-like hose and straight metallic rod make from lock, a pair of can freely insert and take out can screw in the Self-locking screw of following closely tail end screw thread inner chamber in the rotary self-locking arm of nail afterbody central hollow intracavity and one piece and form jointly.

This utility model contrasts its advantage of above technology: owing to adopt snake-like hose from lock, making all kinds ofly has the intramedullary pin of certain crooked radian also can be made for pressurization self-locking intramedullary pin, thereby has increased its range of application; Comparing with intramedullary pin in present use various with lock does not need to carry out individually that pinning inserts operation, can in the medullary cavity of bone upper/lower terminal, reach nail bone pressurization self-locking purpose voluntarily, the function that had both had various intramedullary nail with lock, simplified the operation technique program again, shortened operating time, made operation safer; Need far away in fracture, the nearly broken ends of fractured bone in the art again otch and cause artificially bone damaged, window, avoided more operation wound to the patient; Do not need tv x-ray machine and the special bone surgery bed that is equipped with in the art, avoided that the patient contacts X ray with the patient in the art; The patient takes comfortable dorsal position in the art, is convenient to anesthesia management; Postoperative is at the different times of union of fracture, situation according to union of fracture, can take out and insert the nail tailspin at the nail tail end changes self-locking arm, adjust carry out from the length of lock and Self-locking screw that bone is far away, any selection, adjusting, conversion and the combination of the self-locking of near-end nail bone to be to promote union of fracture; Because it is short that nail caudal end egress place exposes to the outside split pole of bone, and surrounding tissue is answered back to gently, be difficult for producing postoperative pain and influence joint motion; This intramedullary pin uses nail tail end female thread nail pulling, and it is safe and reliable that nail puller is gone out.

Below providing accompanying drawing further specifies in conjunction with the embodiments.

Fig. 1 is pressurization self-locking intramedullary pin side sectional view.

Fig. 2 is pressurization self-locking intramedullary pin front section view.

Fig. 3 is pressurization self-locking intramedullary pin user mode sketch map.

Self-locking screw (1), the rotation circular shaft (2) of nail afterbody rotary self-locking arm, can insert and take out in a pair of rotary self-locking arm (3) of nail afterbody intracavity, intramedullary pin wall (4), can insert and take out in the nail tail, the body intracavity from lock (5), be installed on the upper arm (6) of the intersection rotary self-locking arm in the vertical shape groove of following closely the perforation of both sides, tip, the rotation circular shaft (7) of intersection rotary self-locking arm in the vertical shape groove of nail tip, the underarm (8) of nail tip intersection rotary self-locking arm, nail both sides, tip connect the protruding ridge of triangle (9) that the vertical shape groove substrate makes progress, and follow closely solid epiconus (10), the pod (11) that nail afterbody hypomere both sides connect, nail both sides, tip connect vertical shape groove (12).Pressurization self-locking intramedullary pin structurally has following performance characteristics: the nail tip connects the protruding ridge of triangle (9) that the vertical shape groove substrate makes progress and can limit and be installed in the interior intersection rotary self-locking arm of this vertical shape groove any side arm to side oscillation, and guaranteeing has the minimum range of holding from lock (5) lower end between its pair upper arm point (6); Can insert the nail tail smoothly from lock (5), body central hollow intracavity, the accurate roof pressure of its lower end energy are between the inboard inclined-plane of two upper arm (6) of nail tip rotary self-locking arm, and two upper arm (6) and pair underarm (8) can open to two sideway swivels through nail both sides, tip perforation vertical shape grooves (1 2) around the rotation circular shaft (7) of intersection rotary self-locking arm after being pushed; The nail tailspin changes self-locking arm (3) can be inserted in nail afterbody central hollow intracavity, is being subjected to Self-locking screw (1) and vertical shape grooves (11) are introversive to be shifted down and to rotate circular shaft (2) around it and open to two sideway swivels from connecting in nail afterbody hypomere both sides the pushing of lock (5) under; Self-locking screw (1) can produce the huge propulsive force that presses down when screwing in nail tail end screw thread inner chamber, can promote to follow closely tailspin commentaries on classics self-locking arm (3) and moves following closely intracavity from lock (5), finishes the self-locking purpose of pressurizeing.The main nail of pressurization self-locking intramedullary pin is whole to adopt medical special stainless steel seamless pipe to be processed into, other each part adopts the medical stainless steel material to make, wherein can adopt coil to be made into soft post from lock, all kinds of pressurization self-locking intramedullary pin external diameters that are used for femur, tibia and humerus are 8 to 12mm, profile is slightly different, and multiple length specification is arranged.Pressurization self-locking intramedullary pin is applicable among femur, tibia, the humerus backbone that 2/3rds various types of fracture, bone does not connect, bone malformation, bone prolong and pathologisch Bruch.The brief introduction of pressurization self-locking intramedullary pin using method is as follows: anesthesia back patient lies on the back on operation table, little otch open surgery reseting fracture, pears shape nest at femur, the tibial tubercle nearside of tibia slightly in and the below of intercondylar area, the nail point place of going at the greater tubercle place of humerus holes, expand and do not expand pulp cavity, the nail of suitable external diameter and length is inserted in direct motion, femur and the humerus nail plug pin that also can drive in the wrong direction.Insert the nail back and insert earlier from lock (5) to the nail intracavity, insert the nail tailspin again and change self-locking arm (3), at last Self-locking screw (1) is firmly screwed in fully nail tail end screw thread inner chamber and promptly finish the endogenous cause of ill with pressurization self-locking property and perform the operation surely, user mode is seen accompanying drawing 3.

Claims (1)

1. Pressurization self-locking intramedullary pin comprises that a cross section is the pipe column, both sides have groove, central authorities are hollow metallic rod, be divided into tail, body, point three parts, it is characterized in that: hypomere and tip at the intramedullary pin afterbody have the vertical shape groove that both sides connect, pair of cross rotary self-locking arm is installed in the vertical shape groove of tip, be furnished with simultaneously one can freely insert and take out in nail afterbody and nail body central hollow intracavity by snake-like hose and straight metallic rod make from lock, a pair of can freely insert and take out in the rotary self-locking arm of intramedullary pin afterbody central hollow intracavity and one piece can screw in the Self-locking screw of following closely tail end screw thread inner chamber.

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