CN202235630U

CN202235630U - Medical hollow forcing screw

Info

Publication number: CN202235630U
Application number: CN201120387833XU
Authority: CN
Inventors: 房志刚; 徐晓壮
Original assignee: CHANGZHOU DEAN MEDICAL MACHINERY Co Ltd
Current assignee: Dean medical technology Ltd
Priority date: 2011-10-12
Filing date: 2011-10-12
Publication date: 2012-05-30
Anticipated expiration: 2021-10-12

Abstract

The utility model relates to a medical hollow forcing screw, which comprises a rod, a front threaded section and a rear threaded section. The front threaded section and the rear threaded section are arranged at two ends of the rod; due to the directions of threads on the front threaded section and the rear threaded section, bone tissues on the front threaded section and the rear threaded section can be dragged to the center of the rod when the rod rotates; and a needle guiding through hole is arranged on a center shaft of the rod. The hollow forcing screw is a bone screw with threads at two ends, the threads at the two ends of the bone screw are bone threads meeting standards of the medical instrument industry, one end of the bone screw is large while the other end of the bone screw is small, the tension directions of the threads face towards the center of the bone screw, when the hollow forcing screw is screwed in bones of a patient, a forcing effect can be promoted between the fractured bones, surgical operation steps are reduced, and possibility of fracture healing is increased. The screw is in the hollow design, and can minimally invasively operate along a guide needle, so that surgical incision is reduced, wound healing time is shortened, and sufferings of the patient are reduced. The hollow forcing screw can be completely buried into the bones, and the problem that stitching is difficult or soft tissues are stimulated after surgery due to the fact that other hollow screw caps are exposed out of the bones is avoided.

Description

Medical hollow forcing screw

Technical field

This utility model relates to orthopaedics and uses technical field of medical, specifically is a kind of medical hollow forcing screw that is used to treat fracture.

Background technology

Fracture of femoral neck is the common frdquently encountered disease of orthopaedics, is mainly in the old people.Along with the arriving gradually of aging society, the incidence rate of fracture of femoral neck constantly rises, and therefore the treatment of old fracture of femoral neck is one of emphasis of orthopaedic trauma research always.

Fracture of femoral neck is the fracture of common in older people, and along with the prolongation of population average life, sickness rate is in rising trend year by year.The traditional conservative Therapeutic Method needs long-term bed; Be prone to cause the gerontal patient complication such as hypostatic pneumonia, urinary tract infection, decubital ulcer, DVT to occur; Whole body general state variation causes complication such as original cardiovascular and cerebrovascular vessel, hormonal system and increases the weight of, even causes death.Artificial thigh bone or total hip replacement are costly, and operation wound is big, and soft tissue destruction is extensive, overage gerontal patient's tolerance, and there are long term complications such as prosthetic loosening, sinking, wearing of acetabulum dislocation, ectopic ossification in postoperative.Research at present shows that its clinical efficacy and percutaneous internal fixation do not have significant difference.Should at first consider the first phase internal fixation treatment for old fracture of femoral neck.Even long term complications such as nonunion or femur head necrosis take place in it, also get the time for patient's secondary operation, create favorable conditions for improving the whole body function simultaneously.Therefore the key of treatment is to strive for early stage satisfied resetting and strong internal fixation, and the ability that reactivates as early as possible reduces the generation of complication and increasing the weight of of complication, improves the quality of living.

The utility model content

This utility model technical problem to be solved provide a kind of simple in structure, internal fixation is reliable, wound is little, expense is low, simple to operate, can alleviate the painful of patient and can shorten the medical hollow forcing screw of rehabilitation duration.

For solving the problems of the technologies described above, this utility model provides a kind of medical hollow forcing screw, comprising: the body of rod and the forward and backward thread segment of being located at body of rod two ends; Hand of spiral on the forward and backward thread segment is suitable for when the body of rod rotates, making osseous tissue on the forward and backward thread segment to the central tractive of the body of rod; The central shaft of the said body of rod is provided with the guide pin through hole.

Further, be handled easily, the rear end diameter of the said body of rod is greater than point diameter.

Further, the rear end face of the said body of rod is provided with the quincunx groove of hexagonal, has reduced the probability that adopts positive hexagonal to skid.

The utlity model has positive effect: the hollow forcing screw of (1) this utility model is one piece of screwed bone screw in two ends; Its two ends screw thread is the bone thread that meets the medical device industry standard; The big end of one end is little, and the direction of pull of screw thread is to middle tractive, when being screwed into hollow forcing screw, can promote to pressurize between fracture; Reduce surgical operation step, improve the probability of union of fracture.Hollow forcing screw is a hollow design, can reduce operative incision along the operation of guide pin Wicresoft, reduces wound healing time, alleviates less patient suffering.Hollow forcing screw can be imbedded bone fully, has avoided other hollow screw heads of a nail to expose in the bone outside and has caused stitching difficulty or postoperative to stimulate soft tissue.(2) the medical hollow forcing screw of this utility model is used to treat old fracture of femoral neck, has the obvious advantage that internal fixation is reliable, wound is little, expense is low, simple to operate, is the effective ways of the fresh fracture of femoral neck of clinical treatment.(3) this hollow forcing screw has strong pressurization; Single drive screw is tightened the static plus-pressure that the back fracture end can record 106～120kgf; Three pieces of static plus-pressures that drive screw produced then are 318～360kgf; Once showed between two sclerites in the test of isolated preparation to produce＞compressive stress of 3000N that can make had bigger axial pressure power between fracture site, can resist shear displacemant well.3 pieces of hollow screws are " article " word structure distribution at low level compression trabeculae and high-order tension force bone trabecula simultaneously, and own vol is little, and controlled area is big, and anti-rotation ability is strong, and the stress of generation is more near the longitudinal axis, and the fracture face is drawn close tightr, significantly promotes union of fracture.

Description of drawings

Fig. 1 is the axial section structure chart of the medical hollow forcing screw among the embodiment;

Fig. 2 is the shape assumption diagram of the medical hollow forcing screw among Fig. 1.

The specific embodiment

See Fig. 1-2, the medical hollow forcing screw of present embodiment comprises: the body of rod 1 and the forward and backward

thread segment

3 and 2 of being located at the body of rod 1 two ends; Hand of spiral on the forward and backward

thread segment

3 and 2 is suitable for when the body of rod 1 rotation, making osseous tissue on forward and backward

thread segment

3 and 2 to the central tractive of the body of rod 1; The central shaft of the said body of rod 1 is provided with guide pin through hole 4.Hollow forcing screw is a hollow design, can reduce operative incision along the operation of guide pin Wicresoft, reduces wound healing time, alleviates less patient suffering.Hollow forcing screw can be imbedded bone fully, has avoided other hollow screw heads of a nail to expose in the bone outside and has caused stitching difficulty or postoperative to stimulate soft tissue.

The rear end diameter of the said body of rod 1 is greater than point diameter.

The rear end face of the said body of rod 1 is provided with the quincunx groove 5 of hexagonal, has reduced the probability that adopts positive hexagonal to skid.

Obviously, the foregoing description only be for explain clearly that this utility model does for example, and be not to be qualification to the embodiment of this utility model.For the those of ordinary skill in affiliated field, on the basis of above-mentioned explanation, can also make other multi-form variation or change.Here need not also can't give exhaustive to all embodiments.And conspicuous variation that these spirit that belong to this utility model are extended out or change still are among the protection domain of this utility model.

Claims

1. medical hollow forcing screw is characterized in that comprising: the body of rod (1) and be located at the forward and backward thread segment (3,2) at the body of rod (1) two ends; Hand of spiral on the forward and backward thread segment (3,2) is suitable for when the body of rod (1) rotates, making osseous tissue on the forward and backward thread segment (3,2) to the central tractive of the body of rod (1);

The central shaft of the said body of rod (1) is provided with guide pin through hole (4).

2. medical hollow forcing screw according to claim 1 is characterized in that: the rear end diameter of the said body of rod (1) is greater than point diameter.

3. medical hollow forcing screw according to claim 1 and 2 is characterized in that: the rear end face of the said body of rod (1) is provided with the quincunx groove of hexagonal.