CN2917564Y

CN2917564Y - Femoral head supporting rack made of absorbable material

Info

Publication number: CN2917564Y
Application number: CN 200620096705
Authority: CN
Inventors: 杨操; 杨述华; 李进; 叶哲伟; 许伟华
Original assignee: Union Hospital Tongji Medical College Huazhong University of Science and Technology
Current assignee: Union Hospital Tongji Medical College Huazhong University of Science and Technology
Priority date: 2006-05-18
Filing date: 2006-05-18
Publication date: 2007-07-04
Anticipated expiration: 2016-05-18

Abstract

A femoral head supporting frame that can absorb materials is a hollow cylinder (1). Screw threads (2) are arranged around the cylinder (1), and the upper part of the cylinder (1) is sealed to form a circular arc (3), while the lower part is a hollow roundness. The utility model has overcome the deficiencies that the existing support body has a small support force and the operation method is complex and the sufferers are badly wounded. The utility model is favorable to the vein and the growth of new bones and the operation method is simple for operating. The utility model has little trauma toward the normal tissues of the sufferer and has a practical and reliable supporting function toward the articular surface of the necrotic femoral head and can accurately control the supporting extent. The utility model can widely replace the existing support body and can be applied for supporting the necrotic femoral head.

Description

Absorbable material femoral head bracing frame

Technical field

This utility model relates to a kind of medical apparatus and instruments, and more particularly it is a kind of absorbable material femoral head bracing frame.

Background technology

The treatment of femur head necrosis is the difficult problem that present orthopaedics faces, though its Therapeutic Method is many, curative effect is all not too satisfied, often further develops to subsiding or already present subsiding further increased the weight of, finally cause hip joint the maimed person and must not all right hip replacement.Though the artificial hip joint replacing curative effect has had large increase at present, but because whole coxa substitution is poor than the capable total hip joint of other diseases to the curative effect of femur head necrosis, and the femur head necrosis patient is mostly occurred in 30～50 years old age group, the service life of artificial joint still can not reach patient's life expectancy at present, it is poorer that row is reprocessed the art effect once more, therefore the most of scholar of femur head necrosis still advocated at first should take to keep capital method as far as possible.In the present various Therapeutic Method, how major part improves capital blood confession and promotes capital reparation if concentrating on, and less to how preventing its research of subsiding.The method that prevents collapse of the femoral head and make the femoral head that subsides recover normal morphology comprise utilize after windowing or holing apparatus from inside to outside jack-up subside and implant cortical bone behind the cartilage, or implant and remember titanium alloy reticulated, the elasticity of utilizing the refresh memory of memory titanium alloy reticulated to be had supports the femoral head that subsides.Will there be following defective in traditional operation in body cortical bone implanted unit bone: 1, the cortical bone source is limited; 2, cortical bone will fill up in the femoral head, influences effect of easing stress, also hinders the new vessels necrotic zone of growing into; 3, as adopting the fenestration operation mode, cortical bone is supported between subchondral bone and the neck of femur, can obtain to support preferably, but can not promote the blood vessel femur head necrosis district of growing into, and operation wound is bigger, as adopting core decompression tailing edge decompression tunnel to implant cortical bone, cortical bone can not provide strong support.And the memory titanium alloy reticulated is restive in the support process, easily cause propping up deficiency or excessively prop up, and metal can not absorb, and implants for a long time, and part patient is difficult to accept.

Summary of the invention

The purpose of this utility model is to overcome the weak point of above-mentioned background technology and the absorbable material femoral head bracing frame that provides a kind of absorbable material to make.Utilize the operation method of this absorbable material femoral head bracing frame simple to operate, little to patient's normal tissue injury, solid to the supporting role of necrotic femoral head articular surface.

The purpose of this utility model reaches by following measure: absorbable material femoral head bracing frame, and it is the cylinder 1 of hollow, and threaded 2 around the cylinder 1, described cylinder 1 upper end closed is circular arc 3, and the lower end is circular hollow.

In technique scheme, on the screw thread 2 perforate 4 is arranged around the described cylinder 1.

In technique scheme, on the closed circular arc 3 of described cylinder 1 upper end perforate 5 is arranged.

In technique scheme, the perforate 4 on the described screw thread 2 is circular and/or square.

In technique scheme, the perforate 5 on the described circular arc 3 has 9, and described perforate 5 is circular, an intermediary round hole greater than around be 8 perforates of symmetrical distribution.

In technique scheme, the perforate 4 on the described screw thread 2 has 8 rows from top to bottom.

The utlity model has following advantage: 1. can absorb a strand material bone bracing frame is hollow, and perisporium and top are the porous mesh-shape, do not influence effect of easing stress, also helps blood vessel and goes into femur head necrosis district from blood for the abundant greater trochanter of femur head of district with new bone.2. operation method is simple to operate, hole by core decompression in the operation, under the lateral side of femur greater trochanter, bore tunnel to necrotic area subchondral bone to femoral head through neck of femur, be screwed into bracing frame then along the tunnel to the necrotic area subcartilaginous osseous lamella, bracing frame is by screw thread and the femoral head and the normal sclerotin intercalation of neck of femur of perisporium, for providing enough mechanics, supports the necrotic area subcartilaginous osseous lamella, prevent that it from subsiding, if cartilage subsides, then, recover femoral head normal anatomy form by being screwed into the cartilage jack-up that bracing frame will subside.By progressively being screwed into bracing frame, can accurately control the amplitude of propping up.3. implantable from body spongy bone, other bone substitutes or various somatomedin promotion femoral head Regeneration and Repair in bracing frame.4. bracing frame is finally by creeping substitution, by being replaced from the body bone.This device is little to patient's normal tissue injury in a word, and is solid to the supporting role of necrotic femoral head articular surface.

Description of drawings

Fig. 1 is an interarea structural representation of the present utility model;

Fig. 2 is plan structure figure of the present utility model;

Fig. 3 cuts open the sketch map that shows to this utility model upper end for the A-A of Fig. 1;

Fig. 4 is the B-B cut-away view of this utility model Fig. 1;

Fig. 5 is the sketch map of the real implant into body of this utility model.

The specific embodiment

Describe performance of the present utility model in detail below in conjunction with accompanying drawing:

1 is that cylinder, 2 is that screw thread, 3 is that circular arc, 4 is that perforate, 5 is that perforate, 6 is absorbable material femoral head bracing frame among the figure.

From accompanying drawing 1-Fig. 4 as can be known: this utility model absorbable material femoral head bracing frame, it is the cylinder 1 of hollow, around the cylinder 1 threaded 2, cylinder 1 upper end closed is circular arc 3, the radian of the circular arc 3 of upper end is the meansigma methods of human femoral head radian, 9 round holes 5 are arranged on the closed circular arc 3, and an intermediary round hole is greater than 8 perforates that are symmetrically distributed all around; The lower end is circular hollow, on the screw thread 2 circle and/or square opening 4 is arranged around the cylinder 1, and the perforate 4 on the screw thread 2 has 8 rows from top to bottom.

Fig. 5 is the capital sketch maps of this utility model absorbable material femoral head bracing frame 6 implant into body, and the arrow direction is absorbable material femoral head bracing frame 6 screw-in directions among the figure, by progressively being screwed into bracing frame, can accurately control the amplitude of propping up.

Illustrate further performance of the present utility model through zoopery, Experiments of Machanics and model case below.

Zoopery:

The absorbed femoral head bracing frame that we have designed the suitable size of same structure has carried out zoopery with 30 mongrels.Experiment confirm: after the necrotic femoral head of femur head necrosis model is implanted into bracing frame, regenerated spongy bone girder can be grown in the porous bracing frame of hollow and reconstruction, the netted spongy bone structure of bracing frame mesh is passed through in formation, repair and substitute osseous tissue downright bad in the femoral head, can absorb simultaneously the femoral head bracing frame by creeping substitution, finally be substituted by new bone.

Experiments of Machanics:

Healthy animal bilateral specimen is randomly drawed a side, and sham operated carries out Experiments of Machanics after implanting bracing frame, confirms to implant the intensity and the control sides there was no significant difference of side femoral head surface support power and neck of femur.The specimen of implanting bracing frame can be resisted the femoral head animal animation under and the various stressing conditions of neck of femur fully, confirms in the zoopery that bracing frame can provide enough mechanics supports for femoral head and neck of femur.

Carry out mechanics and measure being used for bracing frame that human body implants, test after bracing frame is implanted the Freshman femur specimen, the support strength on its femoral head surface does not have significant difference with the support strength on normal femoral head surface.

Model case

The male patient, 47 years old, right side hip pain, limited six months of joint motion, X sheet show right lateral thigh head necrosis (Ficat II phase), the patient carries out right lateral thigh bone boring decompression, implants through the decompression tunnel to absorb the femoral head bracing frame.The postoperative X mating plate shows that the position of bracing frame is good, and the postoperative left side hip arthralgia disappears, and movable recovery is normal, postoperative 2 all wounds unwindings, restriction heavy burden in 4 weeks.Postoperative 12 all further consultation X-ray sheets show that Ipsilateral femoral head form is normal, the position no change of bracing frame, and hip joint can be finished the activity of normal range under painless situation.

Need to prove: to those of ordinary skill in the art, can also make some changes or distortion to this utility model under the prerequisite that does not change this utility model principle, this belongs to protection domain of the present utility model equally.

Claims

1, absorbable material femoral head bracing frame is characterized in that it is the cylinder (1) of hollow, cylinder (1) threaded all around (2), and described cylinder (1) upper end closed is circular arc (3), and the lower end is circular hollow.

2, absorbable material femoral head bracing frame according to claim 1 is characterized in that described cylinder (1) has perforate (4) on the screw thread (2) all around.

3, absorbable material femoral head bracing frame according to claim 1 and 2 is characterized in that on the closed circular arc (3) of described cylinder (1) upper end perforate (5) being arranged.

4, absorbable material femoral head bracing frame according to claim 2 is characterized in that the perforate (4) on the described screw thread (2) is circle and/or square.

5, absorbable material femoral head bracing frame according to claim 3 is characterized in that the perforate (5) on the described circular arc (3) has 9, and described perforate (5) is circular, an intermediary round hole greater than around be 8 perforates of symmetrical distribution.

6, absorbable material femoral head bracing frame according to claim 5 is characterized in that the perforate (4) on the described screw thread (2) has 8 rows from top to bottom.