CN1209077C - Rolling-type artificial hip joint - Google Patents

Abstract

A rolling artificial hip joint belongs to the field of artificial joints. The invention includes: a femoral head part, a rolling part, a prosthetic stem part and a round nut. The rolling part is composed of two rolling bearings, and the middle is separated by two isolation rings. , use a round nut to fix the inner ring of the rolling bearing on the stem of the prosthesis through the thread on the main shaft, the outer ring of the rolling bearing and the inner ring of the coupling part of the femoral head are tightly fitted together, and the outer ring of the rolling bearing is fixed on the femoral head . The present invention changes the sliding friction between the original artificial hemihip joint and the natural acetabulum into rolling friction in the direction of flexion and extension through the rolling bearing, which greatly reduces the wear and tear of the prosthesis, prolongs the service life, reduces the production cost, and avoids aggregation. The biological toxicity of ethylene meets the treatment needs of the vast number of domestic patients, and has obvious social benefits and objective economic benefits.

Description

The rolling artificial hip joint

Technical field

What the present invention relates to is a kind of artificial hip joint, and particularly a kind of rolling artificial hip joint belongs to medical apparatus and instruments artificial joint field.

Background technology

Usually Replacement of Hip Joint generally is divided into two kinds: whole coxa substitution and half hip replacement.Thereby artificial hip joint also is divided into two classes: full hip-joint and partial hip joint.The ingredient of full hip-joint specifically is divided into two parts.A part is bulb (being head), and it is made by best the firmest alloy, and the surface is very smooth.In order to lay adaptogen because of the body of a dried shape is arranged below, the bulb, it can insert in the epimere pulp cavity of human femur under loading (Thigh bone), is bonded together tightly with femur.The general associated methods that uses has two kinds: bone cement is fixing to be fixed with biology.Another part is a mortar portion.And half hip prosthesis does not generally comprise mortar portion.Though the structure of present hip prosthesis has nothing in common with each other, what articular surface all adopted is the sliding friction mode.The defective of these artificial hip joints is: metal prostheses and polyethylene acetabular bone produce the polyethylene abrasive particle to mill, after being absorbed by cell, cause a series of problems such as bone dissolving of cell.

Find by literature search, Chinese patent application number is: 02137177.6, denomination of invention is: rolling artificial knee joint, publication number is: 1403064, this patent readme is: mainly comprise: femoral component, rolling element, axle and tibial component, its connected mode is: two raceways are respectively arranged on femoral component and the axle, corresponding raceway is combined to form two cross sections and is circular annulus, rolling element is arranged in the annulus, tibial component is connected with axle, axle is in the interior ectocondyle of femoral component, femoral component, rolling element, axle three has formed the structure that is equal to two rolling bearings.This patent adopts the roller friction mode, has reduced the prosthese wearing and tearing, has prolonged service life, has reduced production cost, has avoided poly bio-toxicity effect.But it is an artificial knee joint, can not be used for the displacement of hip joint.Further retrieval through to prior art still finds no and the identical or similar bibliographical information of rolling artificial hip joint theme of the present invention so far.

Summary of the invention

The present invention is directed to the deficiencies in the prior art and defective, a kind of rolling artificial hip joint is provided.Make it realize the Qu Heshen of hip joint by rolling bearing, when having guaranteed proper motion, bend and stretch the frictional resistance when having reduced motion under the situation of amplitude effectively, greatly reduced the wear extent of metal, the quantity and the particulate size of metal filings are reduced, and, this prosthese does not adopt polyethylene part, thereby has avoided the appearance of polyethylene abrasive particle fully, has therefore avoided the caused problem of polyethylene abrasive particle.

The present invention realizes according to following technical scheme, the present invention includes: partial femoral head, rolling part, prosthese shank portion and round nut, its connected mode is: the part of rolling is made up of two rolling bearings, middle by two cage rings isolation, the main shaft of the inner ring of rolling bearing and prosthese shank portion closely cooperates and is integral, be fixed on the prosthese shank portion by the inner ring of the screw thread on the main shaft with round nut rolling bearing, the connector inner surface of the outer ring of rolling bearing and partial femoral head closely cooperates and is one, thereby the song that forms artificial hip joint is stretched motion.In this motion, partial femoral head and prosthese shank portion be relative motion by the rolling bearing part, thereby the friction mode of artificial hip joint is rolling friction.

Whole partial femoral head comprises: connector, smooth sphere, end face, the face of cylinder, bearing left side stationary plane, the right stationary plane of bearing, die cavity, its connected mode is: smooth sphere and natural acetabular bone constitute the hip joint face, the end face and the face of cylinder cooperate with prosthese shank portion correlation surface, maintain a certain distance, so that partial femoral head rotates flexibly with respect to the prosthese shank portion and minim gap is arranged, a bearing left side, right stationary plane then is used for housing washer location and fixing, connector inwall and bearing outer ring cooperate closely, make no relative motion, die cavity (being the cavity that bearing and partial femoral head constitute) is used to hold round nut and weight reduction.

The rolled portion branch comprises: two rolling bearings and two cage rings, its connected mode is: two cage rings are isolated the inside and outside circle of two rolling bearings respectively, the connector inner surface of housing washer and partial femoral head closely cooperates, and the main shaft of rolling bearing inner ring and prosthese shank portion closely cooperates.

The prosthese shank portion comprises: do in the marrow, sphere, end face, step and main shaft, its mode of connection is: dried in the marrow is that prosthese inserts the part in femur metaphysis and the pulp cavity, the smooth sphere same radius of sphere and partial femoral head, concentric fit forms a big sphere, end face and partial femoral head respective face matched in clearance, main shaft and the rolling bearing inner ring no relative motion that closely cooperates, step then is positioned at the inner ring of rolling bearing on the main shaft.

One section thread connection on the main shaft on round nut and the prosthese shank portion is fixed on the part of rolling on the main shaft jointly by step.

When assembling partial femoral head, rolling part and prosthese shank portion, connector with partial femoral head is enclosed within on the step of prosthese shank portion earlier, between main shaft and connector inner surface, pack into successively bearing, cage ring and bearing, by screwing fixedly rolling bearing of round nut, load onto ball cover by the screw thread of connector and ball cover (connecting piece and ball cover provide and the bonded smooth sphere of acetabular bone jointly) at last and tighten up.

The invention belongs to partial hip joint, have bend and stretch, in turn up, rotate three motions, thereby make the model of action of prosthese approach the model of action of normal hip joint.The design of employing staight shank, outside and side are wedge shape in it, help prosthese and fix; Not windowing in the handle surface, increases the bone cement effect.The apparent height polishing reduces the generation of small chip.The employing bone cement is fixed, and has reduced the dissolved incidence rate of Periprosthetic bone.

The present invention has substantive distinguishing features and marked improvement, the present invention becomes rolling friction by rolling bearing with the sliding friction between original semi-artificial hip joint and the natural acetabular bone, greatly reduce the prosthese wearing and tearing, prolonged service life, reduced production cost, avoid poly bio-toxicity effect, satisfied the demand of vast domestic patient treatment hip joint, had obvious social and objective economic benefit.

Description of drawings

Fig. 1 structural representation of the present invention

Fig. 2 partial femoral head structural representation of the present invention

Fig. 3 rolled portion separation structure of the present invention sketch map

Fig. 4 prosthese shank portion of the present invention structural representation

The specific embodiment

As shown in Figure 1, the present invention includes: partial femoral head 1, rolling part 2, prosthese shank portion 3 and round nut 4, its connected mode is: rolling part 2 is by two rolling bearings 13,14 form, middle by two cage rings 15,16 isolate, the main shaft 21 of the inner ring of rolling bearing and prosthese shank portion 3 closely cooperates and is integral, with round nut 4 by the screw thread on the main shaft 21 with rolling bearing 13,14 inner ring is fixed on the prosthese shank portion 3, connector 6 inner surfacies of the outer ring of rolling bearing and partial femoral head 1 closely cooperate and are one, be fixed on the partial femoral head 1 by the outer ring of partial femoral head 1 with rolling bearing, partial femoral head 1 and prosthese shank portion 3 pass through rolling bearing part 2 and relative motion.

As shown in Figure 2, whole partial femoral head 1 comprises: connector 6, smooth sphere 7, end face 8, the face of cylinder 9, bearing left side stationary plane 10, the right stationary plane 11 of bearing, die cavity 12, its connected mode is: smooth sphere 7 constitutes the hip joint face with acetabular bone, the end face 8 and the face of cylinder 9 cooperate with prosthese shank portion 3 correlation surfaces, maintain a certain distance, so that partial femoral head 1 rotates flexibly with respect to prosthese shank portion 3 and minim gap is arranged, a bearing left side, right stationary plane 10,11 are used for rolling bearing 13, location, 14 outer rings and fixing, connector 6 inner surfacies and rolling bearing 13,14 outer rings cooperate closely, make no relative motion, die cavity 12 is cavitys that bearing and partial femoral head constitute, and is used to hold round nut 4 and weight reduction.

As shown in Figure 3, rolling part 2 comprises: 13,14 and two cage rings 15,16 of two rolling bearings, its connected mode is: two cage rings 15,16 are isolated the inside and outside circle of two rolling bearings 13,14 respectively, connector 6 inner surfacies of rolling bearing 13,14 outer rings and partial femoral head 1 closely cooperate, and the main shaft 21 of rolling bearing 13,14 inner rings and prosthese shank portion 3 closely cooperates.

As shown in Figure 4, prosthese shank portion 3 comprises: do 17 in the marrow, sphere 18, end face 19, step 20 and main shaft 21, its mode of connection is: doing 17 in the marrow is that prosthese inserts the part in femur metaphysis and the pulp cavity, smooth sphere 7 same radius of sphere 18 and partial femoral head 1, concentric fit forms a big sphere, end face 19 and partial femoral head 1 respective face matched in clearance, main shaft 21 and rolling bearing 13, the 14 inner rings no relative motion that closely cooperates, step 20 then is positioned at the inner ring of rolling bearing 13,14 on the main shaft 21.

One section thread connection on the main shaft 21 on round nut 4 and the prosthese shank portion 3 is fixed on rolling part 2 on the main shaft 21 jointly by step 20.

When assembling partial femoral head 1, rolling part 2 and prosthese shank portion 3, connector 6 with partial femoral head 1 is enclosed within on the step 20 of prosthese shank portion 3 earlier, between main shaft 21 and connector 6 inner surfacies, pack into successively rolling bearing 13, cage ring 15,16 and rolling bearing 14, by screwing fixedly rolling bearing 13,14 of round nut 4, load onto ball cover 5 by the screw thread of connector 6 and ball cover 5 at last and tighten up.

Claims (7)

1. A rolling type artificial hip joint, comprising: femoral head part (1), rolling part (2), prosthesis handle part (3) and round nut (4), it is characterized in that, the connection mode is: rolling part ( 2) It consists of two rolling bearings (13), (14), separated by two isolation rings (15), (16) in the middle, the inner rings of the rolling bearings (13), (14) and the part of the prosthesis handle (3) The main shaft (21) is tightly fitted into one body, and the inner rings of the rolling bearings (13), (14) are fixed on the prosthesis handle part (3) with the round nut (4) through the threads on the main shaft (21), and the outer rings of the rolling bearings are It is closely matched with the inner surface of the coupling piece (6) of the femoral head part (1), and the outer rings of the rolling bearings (13), (14) are fixed on the femoral head part (1) through the femoral head part (1). 2. The rolling artificial hip joint according to claim 1, characterized in that the entire femoral head part (1) includes: coupling piece (6), smooth spherical surface (7), end surface (8), cylindrical surface (9) , the left fixed surface of the bearing (10), the right fixed surface of the bearing (11), and the cavity (12). 9) Cooperate with the relevant surface of the prosthesis handle part (3), the left and right fixed surfaces of the bearing (10), (11) are used for positioning and fixing the outer ring of the rolling bearing, and the inner surface of the coupling (6) fits closely with the outer ring of the bearing , the cavity (12) is a cavity formed by the bearing and the femoral head part, and accommodates the round nut (4). 3. The rolling artificial hip joint according to claim 1 or 2, characterized in that the end surface (8) and the cylindrical surface (9) cooperate with the relevant surface of the prosthesis handle part (3), and there is a certain distance so that The femoral head part (1) rotates flexibly relative to the prosthetic stem part (3) and there is a small gap, 4. The rolling artificial hip joint according to claim 1, characterized in that the rolling part (2) includes: two rolling bearings (13), (14) and two spacers (15), (16), which The connection method is: two isolation rings (15), (16) respectively isolate the inner and outer rings of the two rolling bearings (13), (14), the outer rings of the rolling bearings (13), (14) and the femoral head part (1) The inner surface of the connector (6) is closely matched, and the inner rings of the rolling bearings (13), (14) and the main shaft (21) of the prosthesis handle part (3) are closely matched. 5. The rolling artificial hip joint according to claim 1, characterized in that, the prosthetic handle part (3) includes: intramedullary stem (17), spherical surface (18), end surface (19), steps (20) and The main shaft (21) is connected in the following manner: the intramedullary trunk (17) is the part where the prosthesis is inserted into the metaphysis of the femur and the medullary cavity, and the spherical surface (18) has the same radius as the smooth spherical surface (7) of the femoral head part (1) , concentrically fit to form a large spherical surface, the end face (19) and the corresponding surface of the femoral head part (1) are in clearance fit, the main shaft (21) and the inner rings of the rolling bearings (13) and (14) are closely matched without relative movement, and the steps (20) Then the inner rings of the rolling bearings (13), (14) are positioned on the main shaft (21). 6. The rolling artificial hip joint according to claim 1 or 5, characterized in that the round nut (4) is connected to a section of thread on the main shaft (21) on the prosthesis handle (3), and the step (20 ) jointly fix the rolling part (2) on the main shaft (21). 7. The rolling artificial hip joint according to claim 1, characterized in that it adopts a straight handle design, and its inner, outer and side surfaces are wedge-shaped.

Images