CN212346506U

CN212346506U - Knee joint stretches and bends clearance range finding balancer

Info

Publication number: CN212346506U
Application number: CN202021706347.5U
Authority: CN
Inventors: 贾京亮; 李建东; 王东林
Original assignee: Beijing Lidakang Technology Co Ltd
Current assignee: Beijing Lidakang Technology Co Ltd
Priority date: 2020-08-14
Filing date: 2020-08-14
Publication date: 2021-01-15
Anticipated expiration: 2030-08-14

Abstract

The utility model provides a knee joint flexion and extension gap distance measuring balancer, which comprises a base, a pressure measuring mechanism and a gap measuring mechanism, wherein the base comprises a lower supporting arm and a measuring part; the pressure measuring mechanism comprises a pressure measuring block arranged on the measuring part, the pressure measuring block comprises two pressure measuring parts which are symmetrically arranged, pressure scales are arranged on the front end face of the pressure measuring part, the upper supporting arm is inserted into the pressure measuring part and can move in the pressure measuring part, the lower supporting arm and the upper supporting arm are respectively attached to the tibial osteotomy surface and the femoral osteotomy surface, and the pressure values of the inner side and the outer side of the knee joint can be observed; the front end face of the measuring part is provided with gap scales, the eccentric adjusting mechanism is inserted into the measuring part and the pressure measuring block from the front end face of the measuring part, the pressure measuring block can be driven to move up and down by the rotation of the eccentric adjusting mechanism, and the gap value of the extension and flexion of the knee joint can be observed. The pressure values of the inner side and the outer side of the knee joint and the gap value of the knee joint are directly read, so that accurate numerical values are provided for the operation of a doctor, and the operation steps are simplified.

Description

Knee joint stretches and bends clearance range finding balancer

Technical Field

The utility model relates to the technical field of medical equipment, in particular to a knee joint stretching and bending clearance distance measuring balancer.

Background

Knee replacement, which is a procedure for replacing all or part of a damaged natural knee joint of a patient with a knee prosthesis, has been developed as a mature orthopedic procedure today. In total knee arthroplasty, the accuracy of the osteotomy angle of the femur and the tibia needs to be considered, and the problems of whether the soft tissues on the inner side and the outer side of the knee joint are balanced, whether the tension is proper and the like need to be fully considered. The imbalance of soft tissues around the knee joint can cause the postoperative joint instability, the postoperative joint dislocation and the abnormal joint stress, thereby causing the premature and excessive wear of the knee joint prosthesis and the final failure of the operation. The above information disclosed in this background section is only for aiding understanding of the background of the invention and therefore it may include information that does not constitute prior art known to a person of ordinary skill in the art.

In the prior art, when a doctor finishes the proximal tibial osteotomy and the distal femoral osteotomy, the doctor generally needs to evaluate the straightening gap to judge whether the tension of the inner and outer soft tissues is proper and the osteotomy angle is accurate. The existing method is that a doctor inserts a gasket with fixed thickness between the osteotomy surfaces of the femur and the femur is stabilized, and the doctor can observe the opening size between the inner and outer joints and feel the strength of hands by swinging the tibia left and right, so as to judge whether the inner and outer soft tissues are balanced. If not, the attending physician will typically replace the spacer with another gauge thickness, or loosen the medial or lateral collateral ligaments, etc., to achieve the final soft tissue balance and obtain the appropriate amount of clearance. This is the case when assessing the knee flexion gap, the assessment procedure being substantially identical.

The existing knee joint extension and flexion interval distance measurement is mainly conducted by the sense of a doctor, an attending doctor does not obtain a quantitative readable tension numerical value to evaluate whether the tension of the inner and outer soft tissues is proper or not, and the tension evaluation of the inner and outer soft tissues brings great inaccuracy only by virtue of the personal experience of the attending doctor. Similarly, when the main doctor measures the extension gap of the knee joint, the main doctor obtains the final gap value through repeated tests by continuously replacing gaskets with different thickness specifications, the operation steps are repeated, and the operation time is prolonged. The existing knee joint extension and flexion interval distance measurement is completely dependent on the experience of doctors and is inaccurate in measurement.

SUMMERY OF THE UTILITY MODEL

The utility model provides a knee joint stretches and bends clearance range finding balancer. The existing method has the following problems that the pressure in the extension and flexion of the knee joint can not be measured only by evaluating the pressure in the extension and flexion of the knee joint through personal experience of a doctor, the gap value of the knee joint can not be obtained by replacing gaskets with different specifications to measure the gap of the knee joint, and the measurement is not accurate.

In order to solve the above technical problem, an embodiment of the present invention provides the following solutions:

a knee joint flexion and extension gap distance measuring balancer comprises a base, wherein the base comprises a lower supporting arm and a measuring part;

the pressure measuring mechanism comprises a pressure measuring block arranged on the measuring part, the pressure measuring block comprises two pressure measuring parts which are symmetrically arranged, pressure scales are arranged on the front end surface of the pressure measuring part, an upper supporting arm is inserted into the pressure measuring part and can move in the pressure measuring part, the lower supporting arm and the upper supporting arm are respectively attached to the tibial osteotomy surface and the femoral osteotomy surface, and the pressure values of the inner side and the outer side of the knee joint can be observed;

the gap measuring mechanism is characterized in that gap scales are arranged on the front end face of the measuring part, the eccentric adjusting mechanism is inserted into the measuring part and the pressure measuring block through the front end face of the measuring part, the pressure measuring block can be driven to move up and down through rotation of the eccentric adjusting mechanism, and the gap value of extension and flexion of the knee joint can be observed.

The pressure measuring part is inserted into the guide groove and can move up and down in the guide groove;

the measuring part is provided with a through hole, an eccentric adjusting mechanism is installed in the through hole, and the front end face of the measuring part is provided with gap scales on the circumferential side of the through hole.

The pressure measuring block further comprises a connecting part for connecting the two pressure measuring parts, the connecting part is inserted into the guide groove, the connecting part is provided with a through groove, and the eccentric adjusting mechanism is inserted into the through groove.

The eccentric adjusting mechanism comprises an adjusting knob, an eccentric shaft which is eccentrically arranged is arranged on the adjusting knob, and a scribed line is arranged on the front end face of the adjusting knob;

the adjusting knob is inserted into the through hole of the measuring part, the eccentric shaft is inserted into the through groove on the pressure measuring block, the adjusting knob is rotated, the eccentric shaft can drive the pressure measuring block to move in the guide groove, and the gap value of the knee joint in stretching and bending can be observed through the gap scale and the scale line on the adjusting knob.

The pressure measuring device comprises a pressure measuring portion, a pressure measuring portion and an upper supporting arm, wherein a mounting hole is formed in the pressure measuring portion, an observation hole communicated with the mounting hole is formed in the front end face of the pressure measuring portion, pressure scales are arranged at the position, located on the observation hole, of the front end face of the pressure measuring portion, a spring is arranged in the mounting hole, and the upper supporting arm is inserted into the mounting hole and tightly pressed against the spring.

The connecting part of the pressure measuring block and the pressure measuring part are in a step shape, so that after the connecting part is inserted into the guide groove, the end face of the connecting part connected with the pressure measuring part is in contact with the left end face and the right end face of the measuring part.

The adjusting knob is arranged on the inner side of the circumference of the through hole of the measuring part, and the adjusting knob is arranged on the inner side of the circumference of the through hole of the measuring part.

Wherein, the adjusting knob is provided with a rotating groove at one end of the gap scale.

The upper supporting arm is provided with a long groove, the pressure measuring part is provided with a limiting through hole communicated with the mounting hole, a limiting pin penetrates into the limiting through hole and then is inserted into the long groove, and the pressure measuring block is limited to move under the guiding action of the limiting pin.

The bottom end of the pressure measuring part is provided with an inner hole, a spring is arranged in the inner hole, and the spring abuts against the inner hole and the mounting hole.

The above technical scheme of the utility model at least include following beneficial effect:

according to the technical scheme of the utility model, the knee joint stretching and bending clearance distance measuring balancer can directly read the pressure values of the inner side and the outer side of the knee joint, and the clearance value of the knee joint can be conveniently and rapidly measured through the clearance measuring mechanism; the gap measuring mechanism is driven to open the upper supporting arm and the lower supporting arm, and the stretching and bending gap value and pressure value can be visually measured, so that a doctor can accurately apply pressure to the knee joint; whether the inner side and the outer side of the knee joint are balanced or not can be intuitively and accurately judged through the pressure values of the inner side and the outer side of the knee joint, accurate numerical values are provided for doctor operations, the operation steps are simplified, the operation time is saved, and the operation infection risk is reduced.

Drawings

Fig. 1 is an exploded view of the knee joint flexion and extension gap distance measuring balancer of the present invention;

fig. 2 is a schematic structural view of the knee joint flexion and extension gap distance measuring balancer of the present invention;

fig. 3 is a front view of the knee joint flexion and extension gap distance measuring balancer of the present invention;

fig. 4 is a left side view of the knee joint flexion and extension gap distance measuring balancer of the present invention;

fig. 5 is a top view of the knee joint flexion and extension gap distance measuring balancer of the present invention.

Reference numerals:

1. an upper support arm L; 2. a spring; 3. a pressure measurement block; 31. a pressure measuring section; 311. pressure scales; 312. mounting holes; 313. an observation hole; 32. a connecting portion; 321. a through groove; 4. a limit pin; 5. a base; 51. a lower support arm; 52. a measuring section; 521. a guide groove; 522. a through hole; 6. adjusting a knob; 7. an eccentric shaft; 8. a ball bearing; 9. a damping spring; 12. an upper support arm R; 13. a rotating shaft.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

As shown in fig. 1 to 5, the present embodiment provides a knee joint flexion and extension gap distance measurement balancer, which includes a base 5, a pressure measurement mechanism and a gap measurement mechanism, wherein the base 5 includes a lower support arm 51 and a measurement portion 52, the lower support arm 51 is used for clinging to the tibial osteotomy surface, and the measurement portion 52 is used for installing the pressure measurement mechanism and the gap measurement mechanism, so as to realize pressure value measurement and gap value measurement. Pressure measurement mechanism is including setting up the pressure measurement piece 3 on measuring part 52, pressure measurement piece 3 includes the pressure measurement portion 5231 of two symmetry settings, be equipped with pressure scale 311 on the preceding terminal surface of pressure measurement portion 5231, go up the support arm and insert in pressure measurement portion 5231 and can remove in pressure measurement portion 5231, clearance measurement mechanism includes eccentric adjustment mechanism, be equipped with the clearance scale on the preceding terminal surface of measuring part 52, eccentric adjustment mechanism is inserted in measuring part 52 and pressure measurement piece 3 by the preceding terminal surface of measuring part 52, eccentric adjustment mechanism's rotation can drive pressure measurement piece 3 and reciprocate, can observe the clearance value that the knee joint stretched out and bends. Paste lower limb 51 and last supporting arm respectively on shin bone osteotomy face and thighbone osteotomy face, can observe the knee joint inside and outside pressure value through pressure scale 311, it divide into supporting arm L1 and last supporting arm R12 to go up the supporting arm, it is used for measuring in the knee joint to go up the supporting arm two, the pressure value of outer both sides, when interior, the pressure value of outer both sides is inequality, it does not reach the balance to explain the knee joint, so, the knee joint of this embodiment is stretched and is bent clearance range finding balancer and still possesses through interior, whether the balanced function of knee joint is judged to the pressure value in the outside. Judging the tension of the inner and outer sides of the knee joint, when the tension of the inner and outer sides is expected to be 70N by an attending doctor, the pressure values of the inner and outer sides are required to reach 70N scale under normal conditions, and if the tension value of one side is overlarge, appropriate measures are taken, for example, the collateral ligament of the side is loosened, the tension value of the side is reduced to about 70N, so that the pressure values of the two sides are kept basically consistent, and balance is achieved. The knee joint flexion and extension gap distance measurement balancer can directly read pressure values of the inner side and the outer side of the knee joint, can conveniently and rapidly measure the knee joint gap value through the gap measuring mechanism, measures whether the knee joint reaches balance, provides accurate numerical values for doctor operations, simplifies operation steps, saves operation time and reduces operation infection risks.

In the use process of the knee joint flexion and extension gap distance measuring balancer, after the osteotomies of the distal femur and the proximal tibia are completed, the knee joint is placed in the flexion and extension position or the flexion position, the femur and the tibia are respectively pulled to generate a certain gap, then the balancer is placed in the gap, the lower support arm 51 side is attached to the tibial osteotomy surface, the upper support arm is attached to the femoral osteotomy surface, the eccentric adjusting mechanism is adjusted, the eccentric adjusting mechanism drives the pressure measuring block 3 to move upwards to enlarge the distance between the upper support arm and the lower support arm 51, so that the upper support arm upwards supports the femoral osteotomy surface, the pressure scale 311 and the gap scale are observed to obtain the current inner and outer side pressure values of the knee joint, and the current knee joint flexion and extension gap value, namely, the knee joint flexion gap value or the knee flexion gap value is obtained. The measurement of the pressure value of the inner side and the outer side of the knee joint and the measurement of the gap value of the extension and the flexion of the knee joint complement each other and interact with each other, so that a doctor can measure the pressure value and the gap value of the inner side and the outer side conveniently, and whether the inner side and the outer side of the knee joint are balanced or not is judged.

Specifically, the pressure scale 311 includes two side scales, one side scale is a pressure value, the other side scale is a gap value, the gap value is on the gap scale, and the gap value of the knee joint in flexion and extension is equal to the value on the gap scale minus the gap value on the pressure scale 311.

Further, be equipped with the bead structure on upper support arm and the lower support arm 51, increase frictional force for the support arm is more firm with the laminating of osteotomy face.

The measuring part 52 of the present embodiment is provided with a vertically arranged guide groove 521, and the pressure measuring part 5231 is inserted into the guide groove 521 and can move up and down in the guide groove 521; the measuring portion 52 is provided with a through hole 522, an eccentric adjusting mechanism is installed in the through hole 522, and a gap scale is provided on the circumferential side of the through hole 522 on the front end surface of the measuring portion 52.

The pressure measuring block 3 of the present embodiment includes two pressure measuring portions 5231 and a connecting portion 32, which are symmetrically disposed, the connecting portion 32 connects the two pressure measuring portions 5231, the connecting portion 32 is inserted into the guide groove 521, and the connecting portion 32 can move up and down in the guide groove 521. Specifically, the connecting portion 32 and the pressure measuring portion 5231 are stepped, so that after the connecting portion 32 is inserted into the guide groove 521, the end surfaces of the pressure measuring portion 5231, which are connected to the connecting portion 32, contact the left and right end surfaces of the measuring portion 52, and the stepped structural design ensures the stability of the up-and-down movement of the pressure measuring block 3, and no offset phenomenon occurs. The connecting portion 32 is provided with a through groove 321, and the eccentric adjusting mechanism is inserted into the through groove 321 to adjust the eccentric mechanism, so that the pressure measuring block 3 can move up and down. The pressure measurement part 5231 is provided with a mounting hole 312, the front end surface of the pressure measurement part 5231 is provided with an observation hole 313 communicated with the mounting hole 312, the front end surface of the pressure measurement part 5231 is provided with a pressure scale 311 at the observation hole 313, a spring 2 is arranged in the mounting hole 312, and the upper support arm is inserted in the mounting hole 312 and presses the spring 2. Specifically, the bottom end of the pressure measuring portion 5231 is provided with an inner hole, a spring 2 is installed in the inner hole, and the spring 2 abuts against the inner hole and the installation hole 312. Specifically, the upper support arm is provided with a marking line, the upper support arm is located at a certain position, the marking line and the pressure scale 311 on the upper support arm are observed through the observation hole 313, and the pressure value is observed. Furthermore, a limiting through hole communicated with the mounting hole 312 is further formed in the pressure measuring portion 5231, an elongated slot is formed in the upper support arm, a limiting pin 4 penetrates into the limiting through hole and then is inserted into the elongated slot, and the pressure measuring block 3 is limited to move under the guiding action of the limiting pin 4, so that the guiding action is achieved, and the rotation of the upper support arm is avoided.

The eccentric adjusting mechanism of the embodiment comprises an adjusting knob 6, wherein an eccentric shaft 7 which is eccentrically arranged is arranged on the adjusting knob 6, and a reticle is arranged on the front end face of the adjusting knob 6; the adjusting knob 6 is inserted into the through hole 522 of the measuring part 52, the eccentric shaft 7 is inserted into the through groove 321 on the pressure measuring block 3, the adjusting knob 6 is rotated, the eccentric shaft 7 can drive the pressure measuring block 3 to move in the guide groove 521, so that the upper supporting part moves up and down relative to the lower support, and the gap value of the knee joint in extension and flexion can be observed through the gap scale and the scribed line on the adjusting knob 6. Further, a plurality of holes are arranged on the outer circumference of the adjusting knob 6, the damping spring 9 and the ball 8 are arranged in the holes, the ball 8 is propped against the inner circumference of the through hole 522 of the measuring part 52, and the ball 8 and the damping spring 9 are designed to provide proper damping for the adjusting knob 6. Further, a rotation groove is provided on the adjusting knob 6 at one end of the clearance scale, and the adjusting knob 6 is rotated by the rotation groove, and the rotation groove is preferably a hexagonal groove, and is preferably provided at the center of the adjusting knob 6. Further, the eccentric adjustment mechanism further includes a rotating shaft 13, and the rotating shaft 13 is mounted on the eccentric shaft 7 and is located in the through hole 522 of the measuring part 52.

The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A knee joint flexion and extension gap distance measuring balancer is characterized by comprising a base, wherein the base comprises a lower supporting arm and a measuring part;

2. The knee joint flexion and extension gap distance measuring balancer as claimed in claim 1, wherein the measuring part is provided with a vertically arranged guide groove, and the pressure measuring part is inserted into the guide groove and can move up and down in the guide groove;

3. The knee joint flexion gap distance measuring balancer as claimed in claim 2, wherein the pressure measuring block further includes a connecting portion connecting the two pressure measuring portions, the connecting portion is inserted into the guide groove, the connecting portion is provided with a through groove, and the eccentric adjusting mechanism is inserted into the through groove.

4. The knee joint flexion gap distance measuring balancer as claimed in claim 3, wherein the eccentric adjusting mechanism comprises an adjusting knob, the adjusting knob is provided with an eccentric shaft which is eccentrically arranged, and the front end face of the adjusting knob is provided with a reticle;

5. The knee joint flexion gap distance measuring balancer as claimed in claim 3, wherein the pressure measuring part is provided with a mounting hole, the front end face of the pressure measuring part is provided with an observation hole communicated with the mounting hole, the front end face of the pressure measuring part is provided with a pressure scale at the observation hole, the mounting hole is provided with a spring, and the upper support arm is inserted into the mounting hole and presses the spring.

6. The knee joint flexion gap distance measuring balancer as claimed in claim 3, wherein the connecting portion of the pressure measuring block and the pressure measuring portion are stepped such that end surfaces of the pressure measuring portion connecting the connecting portion contact both left and right end surfaces of the measuring portion after the connecting portion is inserted into the guide groove.

7. The knee joint flexion gap distance measuring balancer as claimed in claim 4, wherein a plurality of holes are formed on the outer circumference of the adjusting knob, damping springs and balls are mounted in the holes, and the balls abut against the inner circumference of the through hole of the measuring part.

8. The knee joint flexion gap distance measuring balancer of claim 4, wherein a rotation groove is provided on one end of the adjusting knob located on the gap scale.

9. The knee joint flexion gap distance measuring balancer as claimed in claim 5, wherein the upper support arm is provided with an elongated slot, the pressure measuring part is provided with a limit through hole communicated with the mounting hole, and a limit pin penetrates into the limit through hole and then is inserted into the elongated slot to limit the pressure measuring block to move under the guiding action of the limit pin.

10. The knee joint flexion and extension gap distance measurement balancer as claimed in claim 5, wherein an inner hole is provided at the bottom end of the pressure measurement portion, a spring is installed in the inner hole, and the spring abuts against the inner hole and the installation hole.