CN103239232B - Stable knee joint shin offset amount measurement device - Google Patents

Abstract

The invention discloses a stable knee tibial offset measuring device, which comprises a measuring seat, on which a measuring mechanism and a positioning mechanism are arranged; the positioning mechanism includes a three-point positioning mechanism and a flexible positioning mechanism, and the flexible positioning mechanism includes an adaptive positioning mechanism. The flexible positioning layer of the patient's leg shape; the three-point positioning mechanism includes a vertex positioning head that cooperates with the tibial tubercle of the knee joint and a positioning bracket that is rotated and installed on the bottom surface of the measuring seat. Ankle positioning head; the measuring mechanism includes an axial measuring mechanism for measuring the anteroposterior axial laxity of the knee joint and a circumferential measuring mechanism for measuring the circumferential laxity of the knee joint; the axial measuring mechanism includes a measuring slider, and the circumferential measuring The mechanism includes a measuring rod that is rotatably mounted on the measuring slider, and the end of the measuring rod facing the knee joint is provided with a measuring head that cooperates with the patella; the measuring base is also equipped with a measuring rod for measuring the position of the measuring slider and for measuring the rotation angle of the measuring rod metering device.

Description

Stabilized Knee Tibial Offset Measuring Device

technical field

The invention belongs to the technical field of medical devices, and in particular relates to a stable knee tibial offset measurement device.

Background technique

Knee cruciate ligament injury will cause anterior-posterior axial instability and laxity, and the measurement of the anterior-posterior axial laxity offset of the knee joint plays a very important role in diagnosing knee cruciate ligament injury. At present, the more accurate physical examination method is Lachman's examination, but this simple examination is more subjective and cannot be quantified. Therefore, the KT1000 joint activity measuring instrument and the KT2000 joint activity measuring instrument have appeared on the market, which can objectively quantify the front and rear of the knee joint. The accurate reading of axial laxity provides a reliable basis for the diagnosis of knee cruciate ligament injury.

However, after research, it has been found that the injury of the cruciate ligament of the knee joint will not only cause the anteroposterior axial relaxation, but also the circumferential relaxation of the knee joint, that is, the knee joint will deflect at a certain angle in the circumferential direction. Therefore, the current data that only measure the anteroposterior and circumferential laxity of the knee joint cannot fully reflect the degree of injury of the cruciate ligament of the knee joint.

In addition, the existing KT1000 joint activity measuring device and KT2000 joint activity measuring device are only fixed on the patient's lower leg by straps. On the one hand, there are defects of inaccurate positioning, that is, the installation positions on the two legs of the patient are inconsistent On the other hand, there is a defect of shaking (easy to slide) during the measurement process. These defects will lead to inconsistencies in the measurement benchmarks of the patient's two legs, and there will be large errors in the obtained measurement results.

Contents of the invention

In view of this, the purpose of the present invention is to provide a stable knee tibial offset measurement device, which can not only measure the circumferential laxity of the knee joint, but also the cruciate ligament of the knee joint. The diagnosis of damage provides reliable data basis, and can be accurately positioned and fixed, effectively improving the measurement accuracy.

To achieve the above object, the present invention provides the following technical solutions:

A stable knee tibial offset measuring device, comprising a measuring base, the measuring base is provided with a measuring mechanism and a positioning mechanism;

The positioning mechanism includes a three-point positioning mechanism and a flexible positioning mechanism. The flexible positioning mechanism includes a flexible positioning layer that adapts to the shape of the patient's leg through deformation. The flexible positioning layer is fixed on the side of the measuring seat close to the patient's leg. on the bottom surface of the base; the three-point positioning mechanism includes a vertex positioning head that is fixedly arranged on the bottom surface of the measurement base and cooperates with the tibial tuberosity of the knee joint and a positioning bracket that is rotated and installed on the bottom surface of the measurement base. The bracket is provided with two ankle positioning heads respectively matched with the two ankle joints and the interval distance can be adjusted;

The measuring mechanism includes an axial measuring mechanism for measuring the anteroposterior axial laxity of the knee joint and a circumferential measuring mechanism for measuring the circumferential laxity of the knee joint; the axial measuring mechanism includes a single-degree-of-freedom sliding fit mounted on The measuring slider on the front end surface of the measuring seat, the circumferential measuring mechanism includes a measuring rod that is rotated and fitted on the measuring slider, and the end of the measuring rod facing the knee joint is provided with a measuring head that cooperates with the patella , the axis of rotation of the measuring rod relative to the measuring slider is perpendicular to the front end of the measuring seat;

A metering device for measuring the position of the measuring slider and for measuring the rotation angle of the measuring rod is also arranged on the measuring base.

Further, the bottom surface of the measuring seat is provided with a slide rail mechanism 1 for adjusting the position of the positioning bracket, and the slide rail mechanism 1 includes a slide rail 1 arranged on the measuring seat and a slide block matched with the slide rail I, the positioning bracket is rotatably mounted on the slider I.

Further, the positioning bracket is provided with a leveling mechanism for adjusting the distance between the ankle positioning head and the bottom surface of the measuring seat.

Further, an angle plate for measuring the rotation angle of the measurement rod is provided between the measurement slider and the measurement rod, and/or an electronic angle meter for measuring the rotation angle of the measurement rod is arranged in the measurement seat .

Further, a scale for measuring the position of the measuring slider is provided between the measuring seat and the measuring slider, and/or a position sensor is provided on the measuring seat for measuring the position of the measuring slider.

Further, a display screen for displaying the position of the measuring slider and the rotation angle of the measuring rod is provided on the measuring base.

Further, the side of the measuring seat is provided with a loop or a hook for binding the fixing belt.

Further, the flexible positioning layer is made of soft rubber.

Further, the measuring head is provided with a measuring groove matching with the patella, and the ankle positioning head is provided with a positioning groove matching with the ankle.

Further, among the two ankle positioning heads, one of the ankle positioning heads is fixedly mounted on the positioning bracket, and the other ankle positioning head is mounted on the positioning bracket with sliding fit.

The beneficial effects of the present invention are:

The stable knee tibial offset measuring device of the present invention can position the measuring seat through the apex positioning head and the two ankle positioning heads by setting the three-point positioning mechanism, and the positioning bracket can be rotated and installed on the measuring seat and The distance between the two ankle positioning heads is set to be adjustable, which can ensure that the positioning references on the patient's legs are consistent; by setting the flexible positioning mechanism, after positioning through the three-point positioning mechanism, the deformation of the flexible positioning layer is self-adaptive The patient's leg shape, that is, the patient's leg can be partially embedded in the flexible positioning layer, which can effectively prevent the measuring seat from swinging left and right during the measurement process, making the measurement more convenient and the result more accurate;

By setting up the measuring mechanism, after the positioning of the measuring seat is completed, the measuring head can be placed on the patella by changing the position of the measuring slider on the measuring seat and changing the rotation angle of the measuring rod. The position of the slider and the rotation angle of the measuring rod can effectively measure the anteroposterior axial laxity of the knee joint and the circumferential laxity of the knee joint after the cruciate ligament injury of the knee joint; On the other hand, it can ensure that the distance of the measuring head relative to its rotation center remains unchanged, that is, the accuracy of the measured laxity in the circumferential direction of the knee joint is higher.

Description of drawings

In order to make the purpose, technical scheme and beneficial effect of the present invention clearer, the present invention provides the following drawings for illustration:

Fig. 1 is the structure schematic diagram of the embodiment of the stabilizing type knee joint tibial offset measurement device of the present invention;

Fig. 2 is a bottom view of Fig. 1 .

Detailed ways

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1 , it is a schematic structural diagram of an embodiment of a device for measuring tibial deviation of a stabilized knee joint according to the present invention. The device for measuring the amount of displacement of the tibia of the stable knee joint in this embodiment includes a measuring seat 1 on which a measuring mechanism and a positioning mechanism are arranged.

The positioning mechanism includes a three-point positioning mechanism and a flexible positioning mechanism. The flexible positioning mechanism includes a flexible positioning layer 2 that adapts to the shape of the patient's leg through deformation. The flexible positioning layer 2 is fixed on the bottom surface of the measuring seat 1 near the patient's leg. The flexible positioning layer 2 of the embodiment is made of soft rubber, which can meet the requirements of deformation and self-adaptation to different patient's leg shapes. Of course, the flexible positioning layer can also be made of other materials, which will not be repeated here. The three-point positioning mechanism includes the apex positioning head 3 which is fixedly arranged on the bottom surface of the measuring base 1 and cooperates with the tibial tubercle of the knee joint and the positioning bracket 4 which is rotated and installed on the bottom surface of the measuring base 1. The positioning bracket 4 is provided with two respectively Cooperate with two ankle joints and the adjustable ankle positioning head 5 of interval distance. One of the ankle positioning heads 5 of the present embodiment is fixedly arranged on the positioning bracket 4, and the other ankle positioning head 5 is slidably mounted on the positioning bracket 4. The ankle positioning head 5 adopting this structure can conveniently adjust the two ankle positioning heads. The distance between 5 is convenient for positioning and operation, and one of the ankle positioning heads 5 is fixed, which can ensure that the adjustment reference is inconvenient and the measurement reference of the two legs is consistent.

The measuring mechanism includes an axial measuring mechanism for measuring the anteroposterior axial laxity of the knee joint and a circumferential measuring mechanism for measuring the circumferential laxity of the knee joint. The axial measuring mechanism includes a single-degree-of-freedom sliding block 6 installed on the front end of the measuring seat 1, and the circumferential measuring mechanism includes a measuring rod 7 that is rotated and mounted on the measuring block 6, and the measuring rod 7 faces the knee joint. One end is provided with a measuring head 8 cooperating with the patella, and the rotation axis of the measuring rod 7 relative to the measuring slider 6 is perpendicular to the front end surface of the measuring base 1 . Preferably, the measurement head 8 is provided with a measurement groove that cooperates with the patella, and the ankle positioning head 5 is provided with a positioning groove that cooperates with the ankle. The ankle positioning head 5 adopting this structure can be positioned accurately. Head 8, easy to find the measurement benchmark.

Measuring devices for measuring the position of the measuring slider 6 and for measuring the rotation angle of the measuring rod 7 are also provided on the measuring base 1 .

The stable knee tibial offset measuring device of this embodiment can position the measuring seat 1 through the apex positioning head 3 and the two ankle positioning heads 5 by setting a three-point positioning mechanism, and the positioning bracket 4 can be rotated and installed on the The distance between the measuring seat 1 and the two ankle positioning heads 5 can be adjusted to ensure that the positioning references on the patient's legs are consistent. By setting the flexible positioning mechanism, after being positioned by the three-point positioning mechanism, the deformation of the flexible positioning layer 2 adapts to the shape of the patient's leg, that is, the patient's leg can be partially embedded in the flexible positioning layer 2, which can effectively avoid the measurement seat 1. Oscillation occurs during the measurement process, making the measurement more convenient and the result more accurate.

By setting the measuring mechanism, after the positioning of the measuring base 1 is completed, by changing the position of the measuring slider 6 on the measuring base 1 and changing the rotation angle of the measuring rod 7, the measuring head 8 can be placed on the patella. The position of the measuring slider 6 and the rotation angle of the measuring rod 7 of the patient's legs can effectively measure the anteroposterior axial laxity of the knee joint and the circumferential laxity of the knee joint of the patient after the cruciate ligament injury of the knee joint. By rotatably fitting the measuring rod 7 on the measuring slider 6, the distance between the measuring head 8 relative to its rotation center can be guaranteed to be constant, that is, the accuracy of the measured circumferential laxity of the knee joint is higher.

Further, the bottom surface of the measuring base 1 is provided with a slide rail mechanism 1 for adjusting the position of the positioning bracket 4, the sliding rail mechanism 1 includes a slide rail 1 arranged on the measuring base and a slide block 19 cooperating with the slide rail, and the positioning bracket 4 rotates Fitted on the slider 19, the measuring base 1 with this structure can adjust the distance between the positioning bracket 4 and the apex positioning head 3, so that the stable knee tibial offset measurement device of this embodiment can meet the needs of different legs. The patient use requirements of the type length.

Further, the positioning bracket 4 is provided with a leveling mechanism for adjusting the distance between the ankle positioning head 5 and the bottom surface of the measuring seat 1. The leveling mechanism of the present embodiment is arranged on the positioning bracket 4 for installing the ankle positioning head 5 The adjusting rod 10 is a telescopic rod with adjustable length. The positioning bracket 4 adopting this structure can be used to adjust the distance between the ankle positioning head 5 and the bottom surface of the measuring seat 1, and then adjust the inclination angle of the measuring seat 1 relative to the patient's leg, and finally enable the measuring head 8 to be accurately aligned with the patient's legs. Patella fit.

Further, an angle plate for measuring the angle of rotation of the measuring rod 7 is provided between the measuring slider 6 and the measuring rod 7, and/or an electronic angle meter for measuring the rotating angle of the measuring rod 7 is provided in the measuring seat 1, the present embodiment The measuring seat 1 is provided with an electronic angle gauge. A scale for measuring and measuring the position of the slider 6 is provided between the measuring seat 1 and the measuring slider 6, and/or the measuring seat 1 is provided with a position sensor for measuring and measuring the position of the sliding block 6. The measuring seat 1 of the present embodiment A position sensor is provided inside to measure the position of the slider 6 . The measuring seat 1 is provided with a display screen for displaying the position of the measuring slider 6 and the rotation angle of the measuring rod 7 . The stable knee tibial offset measuring device adopting the structure has the advantages of simple measurement and convenient reading.

Further, the side of the measuring base 1 is provided with a ring or hook for binding the fixing belt, and the side of the measuring base 1 of the present embodiment is provided with a hanging ring 11. By setting the hanging ring 11, the fixing belt can be bound conveniently, so that the measurement The seat 1 can be firmly fixed on the patient's legs.

The method for measuring the laxity in the circumferential direction of the knee joint and the laxity in the anteroposterior direction of the knee joint using the stable knee tibial offset measuring device of the present embodiment is as follows:

1. Measure the parameter data of the uninjured leg: match the two ankle positioning heads 5 with the ankles of the uninjured leg respectively, match the apex positioning head 3 with the tibial tuberosity of the knee joint, and then use straps and other tools to connect the measuring seat 1 fixed on the leg;

2. Press and fix the measuring head 8 set on the measuring rod 7 on the patella, apply an appropriate force to the measuring seat 1, so that the injured calf moves relative to the thigh, and read the deflection of the rotating rod 3 relative to the reference position at this time The angle value and the position of the measuring slider 6 in the measuring seat 1;

3. Measure the parameter data of the injured leg: After rotating the positioning bracket 4 by 180°, match the two ankle positioning heads 5 with the ankles of the injured leg respectively, match the apex positioning head 3 with the tibial tuberosity of the knee joint, and place the The measuring seat 1 is fixed on the leg;

4. Press the measuring head 8 set on the measuring rod 7 against the patella of the injured leg, apply an appropriate force to the measuring seat 1, move the injured calf relative to the thigh, and drive the measuring slider 6 to move and drive the measurement The rod 7 rotates, and reads the angle value of the deflection of the measuring rod 7 relative to the reference position and the position of the measuring slider 6 on the measuring seat 1;

5. Calculate the laxity in the circumferential direction and the axial laxity in the front and rear of the knee joint after the cruciate ligament injury by calculating the data measured on the front and rear sides.

Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that it can be described in terms of form and Various changes may be made in the details without departing from the scope of the invention defined by the claims.

Claims (10)

1. a Stable knee joint shin offset amount measurement device, is characterized in that: comprise measuring seat, and described measuring seat is provided with the measuring mechanism and detent mechanism of measuring knee joint tibial side-play amount;

Described detent mechanism comprises three-point positioning mechanism and flexible detent mechanism, and described flexible detent mechanism comprises the flexible alignment layers by distortion self adaptation patient lower limb type, and described flexible alignment layers is fixedly installed on described measuring seat on the bottom surface of patient legs side; Described three-point positioning mechanism comprises and to be fixedly installed on described measuring seat bottom surface and the summit positioning head coordinated with knee joint tibial tuberosity and rotatable engagement are arranged on the locating support on described measuring seat bottom surface, and described locating support is provided with two and coordinates with two ankle joint respectively and the adjustable ankle positioning head of spacing distance;

Described knee joint tibial side-play amount comprises kneed antero posterior axis to slackness and circumferential slackness, and described measuring mechanism comprises for measuring knee joint antero posterior axis to the axial measuring mechanism of slackness and the circumferential measuring mechanism for measuring knee joint circumference slackness; Described axial measuring mechanism comprises the measurement slide block that single-degree-of-freedom is slidably installed on described measuring seat front end face, described circumferential measuring mechanism comprises rotatable engagement and is arranged on measuring stick on described measurement slide block, described measuring stick is provided with the gage outfit coordinated with patella towards kneed one end, described measuring stick relative to the rotating shaft of described measurement slide block perpendicular to the front end face of described measuring seat;

Described measuring seat is also provided with for measuring described measurement slide position and the metering device for measuring the described measuring stick anglec of rotation.

2. Stable knee joint shin offset amount measurement device according to claim 1, it is characterized in that: the bottom surface of described measuring seat is provided with the sliding track mechanism I for regulating described locating support position, described sliding track mechanism I comprises the slide rail I be arranged on described measuring seat and the slide block I coordinated with slide rail, and described locating support rotatable engagement is arranged on described slide block I.

3. Stable knee joint shin offset amount measurement device according to claim 1 and 2, is characterized in that: described locating support is provided with the levelling gear for regulating the distance between described ankle positioning head and described measuring seat bottom surface.

4. Stable knee joint shin offset amount measurement device according to claim 3, it is characterized in that: between described measurement slide block and described measuring stick, be provided with the angle scale for measuring the described measuring stick anglec of rotation, and/or in described measuring seat, be provided with the electronic goniometer for measuring the described measuring stick anglec of rotation.

5. Stable knee joint shin offset amount measurement device according to claim 4, it is characterized in that: be provided with the rule for measuring described measurement slide position between described measuring seat and measurement slide block, and/or described measuring seat is provided with the position sensor for measuring described measurement slide position.

6. Stable knee joint shin offset amount measurement device according to claim 5, is characterized in that: described measuring seat is provided with the display screen for showing described measurement slide position and the measuring stick anglec of rotation.

7. Stable knee joint shin offset amount measurement device according to claim 1 and 2, is characterized in that: the side of described measuring seat is provided with link for colligation fixing band or hook.

8. Stable knee joint shin offset amount measurement device according to claim 1 and 2, is characterized in that: described flexible alignment layers adopts soft rubber to make.

9. Stable knee joint shin offset amount measurement device according to claim 1 and 2, is characterized in that: described gage outfit is provided with the measurement groove coordinated with patella, and described ankle positioning head is provided with the detent coordinated with ankle.

10. Stable knee joint shin offset amount measurement device according to claim 1 and 2, it is characterized in that: in two described ankle positioning heads, one of them ankle positioning head is fixedly mounted on described locating support, and described in another, ankle positioning head is slidably installed on described locating support.