CN2127600Y

CN2127600Y - Adjustable rotary expansion-pressuring internal fixator

Info

Publication number: CN2127600Y
Application number: CN 92223170
Authority: CN
Inventors: 孙华贵; 熊作炎
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-05-23
Filing date: 1992-05-23
Publication date: 1993-03-03
Anticipated expiration: 2002-05-23

Abstract

The utility model relates to an adjustable rotary expansion-pressuring internal fixer, according to the method of rotary expansion. The expansion screw tube of the utility model forms a cylinder, wherein, the outer wall of the expansion screw tube is provided with four longitudinal parallel grooves with equal distance; the outer wall of the lower end is a pearl-like surface and is equally cut into a four-leaf splitting shape; the diameter of each four-leaf splitting shaped tube gradually reduces from the top down into a conical tube, and screws are arranged on the inner and outer walls of the upper end of the conical tube. The screw rod presents an oblate shape which is sheathed in the expansion screw tube, wherein, the lower end of the screw rod is provided with a lug boss, and the upper end of the screw rod is provided with screws. A pressing screw nut is screwed on the outer wall screw of the upper end of the expansion screw tube. The utility model has the advantages of easy operation, safety, wide applicability, little pain of the patients, axial direction pressure and fast fracture healing. The utility model is suitable for the use and the popularization in medical departments.

Description

Adjustable rotary expansion-pressuring internal fixator

This utility model belongs to medical mechanical domain.

(patent No.: the upper end of long draw 902004735) is a boss to existing novel expansion pressurization intramedullary needle, the recessed socket that degree of tightness is arranged on the plane, for not making the tension back long draw that expands expose the intermedullary canal upper end, the boss plane always is in the intramedullary needle pipe, when operation, can only carry out degree of tightness like this with playing cutter class instrument.When this novel expansion pressurization intramedullary needle is applied in less pulp cavity internal fixation, because the stubborn spin that is applied is bigger, very easily damage the recessed socket on the boss plane, thereby " skidding " phenomenon can appear beating, the lighter can not expand or swelling degree not enough, weight person can make intramedullary needle be trapped in the pulp cavity and can't extract, and brings great misery to the patient, so its range of application is restricted.

The purpose of this utility model is that design is a kind of can play the pressurization of expanding, and promotes the effect of the very fast healing of fracture, safety, reliable again in operation, the adjustable screw-in that can be adapted to the internal fixation of all kinds of fracture pressurization inner fixer that expands.

Fig. 1 is this practical decomposing schematic representation

1 is expansion tube among the figure, cylindrical, and its outer wall is equidistant to have four parallel longitudinal grooves, and the lower end outer wall is the pearl face, and distance be cut into four leaves and separate shape, the inside and outside wall of upper end all has screw thread. The 2nd, screw rod is inclined to one side toroidal, be sleeved in the expansion tube 1, and its lower end boss, there is screw thread the upper end. The 3rd, pressurizing nut, it is screwed on the outer wall thread of expansion tube 1 upper end.

Using method of the present utility model is: cut folding epiphysis place, a hole is axially bored at the place in the folding epiphysis, axially insert this expansion tube 1 in the bone cavity, make expansion tube 1 be positioned at folding bone both sides, insert screw rod 2 from expansion tube 1 upper end, with impact wrench rotary screw 2, the lower end of screw rod 2 is axially moved down, and to four aspect distendings, the Margarita face is close to the bone cavity inwall with the lower end of expansion tube 1, add pressurizing nut 3 then, and it is tightened, make the folding axis of bone to moving, until the contact of folding bone, to be exposed at last surplus the outer screw rod 2 of end on the expansion tube 1 and section to bite broken, and it can not penetrated in patient's meat get final product with stinging cutting nippers.After the folding knitting, when needing the withdraw of the needle,, remove the expansive force of expansion tube 1 earlier with impact wrench counter-rotating screw rod 2, with the ut socket wrench pressurizing nut 3 is screwed out then, expansion tube 1 can withdraw from.

This inner fixer have the pressurization safety that expands, reliable, convenient, expansive force is big, wide adaptability, patient's suffering of illness is little, fast characteristics heal.

Claims

1, a kind of adjustable screw-in pressurization inner fixer that expands is made up of expansion tube 1, screw rod 2 and pressurizing nut 3, it is characterized in that:

A, expansion tube 1 are cylindrical, and outer wall is equidistant to have four parallel longitudinal grooves, and the lower end is that four leaves separate shape, and caliber is tubular for the circular cone that dwindles gradually from top to bottom in four leaves.The inside and outside wall of upper end all has screw thread.

It is oblate that b, screw rod 2 are, and is sleeved on expansion tube, and interior, its lower end is a boss, and there is screw thread the upper end.

C, pressurizing nut 3 are screwed on the expansion tube 1 upper end outer wall thread.

2, according to the described adjustable screw-in expansion pressurization inner fixer of claim 1, it is characterized in that: expansion tube 1 lower end outer wall is the Margarita face.