CN102085110A

CN102085110A - Femoral head bone cutter

Info

Publication number: CN102085110A
Application number: CN 201110059008
Authority: CN
Inventors: 徐兆万; 门阔业; 李鹏; 李健
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-03-12
Filing date: 2011-03-12
Publication date: 2011-06-08
Anticipated expiration: 2031-03-12
Also published as: CN102085110B

Abstract

The invention discloses a femoral head bone cutter which comprises a handle and a sleeve rotatably installed in the handle, wherein two elongated slots are oppositely arranged on the front section of the sleeve; a cutter bar is connected in the sleeve in a sliding mode; the back end of the cutter bar is provided with a holding part extending out of the sleeve; the front end of the cutter bar is hinged with a cutting knife arranged symmetrically like blades; two blades of the cutting knife can respectively extend out or contract into the two elongated slots along with the axial movement of the cutter bar; an installing groove is arranged at the front end of the cutter bar; the middle part of the cutting knife is connected in the installing groove through a pivot shaft; the cutting knife is in a sectorial blade shape; and the two blades are symmetrical with the hinge point of the cutting knife as a center. The femoral head bone cutter can effectively remove necrotic bone in a necrotic area at the circumference of the femoral head, thereby effectively reducing pressure.

Description

A kind of device for cutting bone inside femoral head

Technical field

The present invention relates to a kind of bone surgery set, specifically is a kind of device for cutting bone inside femoral head.

Background technology

Femur head necrosis is present a kind of clinically common disease.For the second phase, three phases femur head necrosis at present mainly based on the core decompression treatment.This modus operandi helps improving the femoral head blood supply, stops or slows down collapse of the femoral head, eases the pain, thereby plays therapeutical effect.Pressure reducing mode at present commonly used clinically for the drill bit of diameter 10-12mm from holing under the greater trochanter to the Avascular Necrosis Of Femur Head district, bore except that necrotic bone.Because neck of femur has the load-bearing effect, so too slightly easily causing the femoral neck bone amount, reduces on the drill bit of decompression usefulness, cause fracture of femoral neck, drill bit too detailed rules and regulations can not effectively excise necrotic bone.For the patient of necrotic area at the femoral head periphery, because straight drill is directly crossed the main body of back, femur footpath necrotic bone not in the scope of duct, thick, jig drill head all can not thoroughly bore to remove and be positioned at the necrotic bone of this necrotic area, thereby can not effectively reduce pressure.

Summary of the invention

The technical problem to be solved in the present invention provides a kind of device for cutting bone inside femoral head, for the patient of necrotic area at the femoral head periphery, uses this cutter thoroughly to bore except that the necrotic bone in the femoral head.

For solving the problems of the technologies described above, the device for cutting bone inside femoral head that is provided, its construction features is to comprise handle and be rotatably installed in the interior sleeve of handle, on the telescopic leading portion to being equipped with two elongated slots, slidely connect knife bar in the sleeve, the rear end of knife bar is clamping part and stretches out outside the sleeve that the knife bar front end is hinged with and is the symmetrically arranged cutter of foliaceous, two blades of cutter can be respectively moving axially and lean out or retraction two elongated slots with knife bar.

The front end of knife bar is provided with mounting groove, and the middle part of cutter is connected in the mounting groove by hinge.

Described cutter are segmental foliaceous, and two blades are with the pin joint centrosymmetry of cutter.

After adopting said structure, use the bit drills identical to go into neck of femur earlier during operation boring with the sleeve diameter of this cutter, be drilled into femur head necrosis district center or edge under the X line perspective, to insert the bone road with this cutter, the clamping part of knife bar is installed on the electric drill, the handle of holding with a firm grip starts electric drill, promote knife bar while boring, make knife bar along the sleeve lining axial advancement, this moment, two blades of cutter leant out elongated slot gradually, and unfolded two blades can stir excision to the necrotic bone in the femoral head, and the diameter behind two mounted blades is far longer than sleeve diameter, thereby can effectively bore the necrotic bone that removes in femoral head periphery necrotic area, thereby effectively reduce pressure.

Description of drawings

The present invention is further illustrated below in conjunction with accompanying drawing:

Fig. 1 is a structural representation of the present invention;

Fig. 2 is along the profile of A-A line among Fig. 1;

Fig. 3 is the structural representation of user mode of the present invention;

Fig. 4 is the sketch map when carrying out the core decompression operation.

The specific embodiment

Device for cutting bone inside femoral head as depicted in figs. 1 and 2, it comprises handle 6 and is rotatably installed in sleeve 3 in the handle 6, the front end of sleeve 3 is the plane, the structure that above-mentioned rotation is installed realizes by between sleeve 3 and the handle 6 bearing 8 being installed, on the leading portion of sleeve 3 to being equipped with two elongated slots 7, slidely connect knife bar 1 in the sleeve 3, the rear end of knife bar 1 is clamping part 9 and stretches out outside the sleeve 3, knife bar 1 front end is hinged with symmetrically arranged cutter 2, cutter 2 are segmental foliaceous, and two blades are with the pin joint centrosymmetry of cutter 2.Two blades of cutter 2 can be respectively moving axially and lean out or retraction two elongated slots 7 with knife bar 1, shown in Fig. 1 and Fig. 3, when knife bar 1 moves axially to the left side, in two blades difference retraction, two elongated slots 7 of cutter 2, promoting knife bar 1 axially moves to right, two blades of cutter 2 rotate around the pin joint of cutter, promptly lean out two elongated slots 7 respectively, form the drilling state shown in Fig. 3.The concrete structure that cutter 2 are hinged on the knife bar 1 is: the front end of knife bar 1 is provided with the open mounting groove 4 of front end, and the middle part of above-mentioned cutter 2 is connected in the mounting groove 4 by hinge 5.

Shown in Fig. 3 and Fig. 4, use the bit drills identical to go into neck of femur 10 earlier with sleeve diameter, be drilled into center, femoral head 11 necrotic area under the X line perspective, to insert the bone road with this cutter, the clamping part 9 of knife bar 1 is installed on the electric drill, the handle 6 of holding with a firm grip starts electric drill, promote knife bar 1 while boring, make knife bar 1 along sleeve 3 inwall axial advancement, this moment, two blades of cutter 2 leant out elongated slot 7 gradually, and unfolded two blades can stir excision to the necrotic bone in the femoral head 11, because sleeve 3 front ends do not have cutting edge, penetrate cartilage surface so can not pierce osseous tissue once more, rotate the necrotic bone that can effectively bore except that in femoral head periphery necrotic area by driving cutter 2.

Claims

1. device for cutting bone inside femoral head, it is characterized in that comprising handle (6) and be rotatably installed in the interior sleeve (3) of handle (6), on the leading portion of sleeve (3) to being equipped with two elongated slots (7), slidely connect knife bar (1) in the sleeve (3), the rear end of knife bar (1) is clamping part and stretches out outside the sleeve (3), knife bar (1) front end is hinged with and is the symmetrically arranged cutter of foliaceous (2), two blades of cutter (2) can be respectively moving axially and lean out or retraction two elongated slots (7) with knife bar (1).

2. device for cutting bone inside femoral head according to claim 1 is characterized in that: the front end of knife bar (1) is provided with mounting groove (4), and the middle part of cutter (2) is connected in the mounting groove (4) by hinge (5).

3. device for cutting bone inside femoral head according to claim 1 and 2 is characterized in that: described cutter (2) are segmental foliaceous, and two blades are with the pin joint centrosymmetry of cutter (2).