CN201088622Y - Internal and external hexagon hollow pressure titanium bolt - Google Patents

Abstract

An internal and external hexagonal hollow compression titanium screw is provided, which comprises a screw head (4) at the front, a far side screw thread (1), a slide bar (2) at the intermediate back and a screw tail at the back. An internal and external hexagonal screw cap (5) is arranged on the screw tail, and a near side screw thread (3) is positioned at the back part of the slide bar (2). The smooth slide bar (2) is arranged between the far side screw thread (1) and the near side screw thread (3). The screw tail is provided with the internal and external hexagonal screw cap (5), the screw is a hollow titanium screw, and the screw head (4) is a flat port tapping screw thread screw head. The utility model can carry out effective internal fixing to the fracture at limb, pelvis and vertebral column. The operation injury can be farthest reduced and the treatment and recovery are favored by the utility model, which has firm fixation, small organization injury and good biocompatibility. Moreover, for the micro-trauma fixing treatment is carried out to the fracture, the optimal surgical treatment effect can be achieved with minimum operation affection and organization disturbance.

Description

A kind of inside and outside hexagon hollow pressurization titanium screw

Technical field:

This utility model relates to a kind of medical orthopaedics hold-down screw; Relate in particular to a kind of inside and outside hexagon hollow pressurization titanium screw.

Background technology:

Fracture of femoral neck is common clinically a kind of disease, and sickness rate accounts for 3.6% of whole body fracture, and pathogenic factors is with common loose directly related with the age.Fracture of femoral neck is owing to blood supplies reasons such as poor, that shearing force is big, and it is satisfactory that therapeutic effect often is difficult to, and the old people is owing to reasons such as activity minimizing, hypometabolism, endocrine regulations, and sickness rate is higher.Patker fractures down above 60 years old the head that displacement is arranged to 200 example ages and treats with internal fixation and prosthese technology respectively, and the result shows to select for use internal fixation method to be advisable.Dai Kerong etc. have also affirmed that by comparative study internal fixation should become first-selected therapeutic scheme, think and have only the internal fixation failure or severe complications occurs, just consider to use the prosthese technology.Therefore Therapeutic Method is based on the operation internal fixation.Accurately reset, firm internal fixation, to reduce local blood be to guarantee to fracture prognosis bona's key factor for destroying or improving perfusion.But elderly patient is because old, and organ function fails, and may just suffer from complication such as hypertension, heart disease, diabetes before injured, and the operation feared state of mind is serious, is difficult to tolerate bigger internal fixation operation.But the fracture back is if long-term bed causes easily that again some jeopardize the complication of patient's life, and as pneumonia, decubital ulcer, blood vessel embolism, cerebrovascular accident etc., mortality rate is higher.Therefore, how simplifying operation technique, shorten operating time, improve success rate of operation, is the important topic that the orthopedist faces.

Hollow lag screw is widely used, and can be used for greater tubercle fracture in the upper arm, fracture of the surgical neek of the humerus, the inside and outside condylar fracture of humerus.Wogasck Be and Moser KD report in 1991 hollow screw percutaneous screw fixings fracture of the scaphoid bone.Morrissy RT nineteen ninety is reported the slippage of hollow screw resected femur skull epiphysis.Certain according to above-mentioned report hollow screw resected femur skull folding effect.Wogasck reports 89% fresh fracture of the scaphoid bone healing.And the fracture of the scaphoid bone that does not connect or postpone to connect, the fixing back 81% of hollow screw connects.Even the hardened fracture of the scaphoid bone that do not connect of fracture end, 42.8% healing also can be arranged.

AO compressive hollow screw treatment fracture of femoral neck is the design of Switzerland school, and becomes the prefered method of fracture of femoral neck internal fixation in recent years, simple and easy to do, be easy to grasp, operation method that surgical effect is splendid.This operation method only is used for longitudinal fracture of the sacrum, is not suitable for transverse fracture.To I band and the II band fracture of Denis, displacement fracture＜2cm, comparatively suitable.But, still need and further inquire into for the application of fracture that merges nerve injury and III band fracture.

The utility model content:

Existing orthopaedics hold-down screw operation technique bothers in order to overcome, operating time is long, and operation risk is big, the not good technical deficiency of surgical effect; This utility model purpose provides the screw rod of a screw and is made up of proximal thread, distally screw thread and intermediary slide bar three parts, the hexagon hollow titanium screw that pressurizes can carry out effective internal fixation to the fracture at orthopedics patient extremity, pelvis, spinal column position inside and outside the anticreep removing from mould that the nut of screw tail is made up of hexagonals in two; To human fracture's fixation, tissue injury is little, bio-compatible good, the new fixation device fast to union of fracture; Farthest reduce surgical injury, help the treatment and the recovery of conditions of patients the patient; Opposite fracture is carried out Wicresoft's fixation for treatment, disturbs the surgical intervention effect that reaches best with the operation invasion and attack and the tissue of minimum.

For realizing that the technical scheme that this utility model purpose is taked is:

A kind of inside and outside hexagon hollow pressurization titanium screw, comprise the slide bar of forward ailhead and distally screw thread, postmedian, the screw tail at rear portion, the nut of hexagonal in the screw tail is provided with, it is characterized in that: the rear portion at slide bar is provided with proximal thread, is slick slide bar between distally screw thread and the proximal thread.

Described screw tail is provided with the nut of inside and outside double-deck hexagonal.

Described screw is hollow titanium screw, is provided with vertical cavity in the slide bar.

Described ailhead is the syringe needle of flat mouthful tapping screw thread.

Described from the syringe needle to the nut, be provided with continuous cavity.

Described proximal thread is the cortical bone screw thread, and the distally screw thread is a cancellous threads.

The parameter specification of described screw is:

Screw length: 75mm～110mm, every 5mm are a specification;

Slide bar external diameter: 5.0mm;

Proximal thread length: 10mm, proximal thread pitch: 1.75mm, diameter are 7.8mm;

Distally reach: 18mm, distally thread pitch: 2.75mm, diameter are 7.5mm;

Hexagonal opposite side footpath: 4.0mm in the nut, nut outer-hexagonal opposite side footpath: 8.5mm, central aperture is 2.7mm.

The beneficial effects of the utility model are:

1, use clinically the utlity model has little to human tissue injury, go out insufficiency of blood, simple to operate, operating time is short, infection rate after abortion operation is low, helps treatment and recovery to the patient, advanced age or with all receptible advantage of organic disease patient;

2, hollow titanium alloy screw has bio-compatible stability, erosion resistant, diamagnetism and multi-resistance fatigue more, and the metal inertia is big, and the reaction that is difficult for producing electrolysis has no adverse effects substantially to patient's union of fracture;

3, hollow forcing screw has pressurization to fracture end, and union of fracture is fast;

4, operation does not expose fracture site, has avoided the destruction of local blood supply, helps the reparation of union of fracture and local organization;

5, in fracture of femoral neck fixing, the hollow structure of hollow forcing screw has decompressing effect to femoral head, can reduce the incidence rate of postoperative infection, nonunion and femur head necrosis;

6, three cannulated threaded nail is product word at the compression trabeculae of low level and elevated tension force bone trabecula and distributes and constitute the class shelf structure that spreads out, and own vol is little, and controlled area is big, prevents that the ability of revolving is strong, and the stress that makes generation helps union of fracture more near the longitudinal axis;

7, have stronger resistance to compression, bending resistance, anti-rotation performance, fracture fixation is firm;

8, the titanium alloy screw does not produce pseudo-shadow in X line, CT image check, is convenient to recognize early stage femur head necrosis, so that early discovery, the early treatment;

9, owing to the firm internal fixation of hollow nail, patient's postoperative pain symptom is alleviated rapidly, can carry out function exercise and part heavy burden soon, has significantly reduced the generation of fracture complication;

10, titanium alloy hollow screw histocompatibility is good, and rejection is seldom arranged, and does not need second operation to take out, and to not influence of magnetic resonance examination.

11, the nut of screw has inside and outside hexagonal, is easier to take out than common soket head cap screw, and the frequent roller nail of common soket head cap screw takes out the case of difficulty in clinical.

12, this novel screw has near-end cortical bone screw thread, can be firmly fixed in the sclerotin, prevents the generation of withdrawing from and have loosening phenomenon of screw.

Description of drawings:

Fig. 1 is a cross-sectional schematic of the present utility model;

Fig. 2 is a vertical view of the present utility model;

Fig. 3 is a upward view of the present utility model.

1, distally screw thread; 2, slide bar; 3, proximal thread; 4, ailhead; 5, nut; 6, cavity.

The specific embodiment:

Below in conjunction with drawings and Examples this utility model is described in further detail.

As Fig. 1, Fig. 2, shown in Figure 3, this utility model comprises forward ailhead 4, and screw rod is made up of proximal thread 3, distally screw thread 1 and middle slick slide bar 2, and the screw tail is provided with the nut 5 of inside and outside double-deck hexagonal.

Described screw is hollow titanium screw, is made by titanium alloy material.Ailhead 4 is the syringe needle of flat mouthful tapping screw thread.Proximal thread 3 is the cortical bone screw thread, and distally screw thread 1 is a cancellous threads.

The parameter specification of described screw is:

Screw length: 75mm～110mm, every 5mm are a specification;

Slide bar external diameter: 5.0mm;

Proximal thread length: 10mm, proximal thread pitch: 1.75mm, diameter are 7.8mm;

Distally reach: 18mm, distally thread pitch: 2.75mm, diameter are 7.5mm;

Hexagonal opposite side footpath: 4.0mm in the nut, nut outer-hexagonal opposite side footpath: 8.5mm, central aperture is 2.7mm.

Supporting inner hexagon spanner, outer-hexagonal spanner, depth finder have been made.Be beneficial to screw and put into taking-up.

Claims (6)

1. hexagon hollow pressurization titanium screw inside and outside a kind, comprise the slide bar (2) of forward ailhead (4) and distally screw thread (1), postmedian, the screw tail at rear portion, the nut (5) of outer-hexagonal in the screw tail is provided with, it is characterized in that: being provided with proximal thread (3) at the rear portion of slide bar (2), is slick slide bar (2) between distally screw thread (1) and the proximal thread (3).

2. a kind of inside and outside hexagon hollow pressurization titanium screw according to claim 1, it is characterized by: the screw tail is provided with the nut (5) of inside and outside double-deck hexagonal.

3. a kind of inside and outside hexagon hollow pressurization titanium screw according to claim 1, it is characterized by: screw is hollow titanium screw, is provided with vertical cavity (6) in the slide bar (2).

4. a kind of inside and outside hexagon hollow pressurization titanium screw according to claim 1, it is characterized by: ailhead (4) is the syringe needle of flat mouthful tapping screw thread.

5. a kind of inside and outside hexagon hollow pressurization titanium screw according to claim 1, it is characterized by: proximal thread (3) is the cortical bone screw thread, and distally screw thread (1) is a cancellous threads.

6. according to claim 1 or 2 or 3 or 4 or 6 described a kind of inside and outside hexagon hollow pressurization titanium screws, it is characterized by: the parameter specification of described screw is:

Screw length: 75mm～110mm, every 5mm are a specification;

Slide bar external diameter: 5.0mm;

Proximal thread length: 10mm, proximal thread pitch: 1.75mm, diameter are 7.8mm;

Distally reach: 18mm, distally thread pitch: 2.75mm, diameter are 7.5mm;

Hexagonal opposite side footpath: 4.0mm in the nut, nut outer-hexagonal opposite side footpath: 8.5mm, central aperture is 2.7mm.

Images