A patella circumference measuring device

Abstract

The present invention discloses a patella circumference measuring device, which relates to the technical field of medical devices and includes a bottom plate and at least one set of measuring assemblies. Each measuring assembly includes a slider, a fixed support, a sensor support, a positioning device, a tension sensor, and a wire-drawing displacement sensor. Two parallel guide rails are provided on the bottom plate. In one set of measuring assemblies: a slider is slidably connected to each of the guide rails, the fixed support and the sensor support are respectively fixedly connected to the two sliders, the positioning device is used to lock the positions of the fixed support and the sensor support simultaneously, a tension sensor and a wire-drawing displacement sensor are fixedly arranged on the sensor support, and the measuring wire of the wire-drawing displacement sensor is wound around the measuring wheel of the tension sensor for at least one week and then connected to the fixed support. This patella circumference measuring device can accurately and quickly measure the circumference of the patella.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a patella circumference measuring device. Background Art

[0002] Swelling is a common manifestation after knee osteoarthritis, knee joint replacement, and arthroscopic surgery. Preventing and treating swelling is essential for avoiding postoperative complications, improving knee joint function, and promoting patient recovery. Therefore, the evaluation of the degree of knee joint swelling is very important.

[0003] Currently, the most commonly used method for evaluating the degree of knee joint swelling is the measurement of the circumference of the knee joint. By measuring the thigh circumference at 5 cm, 10 cm, and 15 cm away from the knee joint line, the swelling degree of different planes of the knee joint cavity can be reflected. The knee joint line refers to the joint line between the tibial plateau and the femur. This method has become a common means for evaluating the degree of knee joint swelling. However, this measurement method still has the following problems: 1. Currently, a tape measure is mostly used for measurement, and it is difficult for different measurement personnel to apply the same force. If the force is too large, the measured circumference may be too small; on the contrary, if the force is too small, the tape measure may be loose, resulting in an overly large circumference, affecting the accuracy of the evaluation; 2. The measurement position beside the knee joint is not accurately positioned. For the same patient, it is difficult to determine the measurement position of the patella circumference at the same position after several weeks, which affects the evaluation of the treatment effect and recovery degree of the patient; 3. The operation is inconvenient. For example, when measuring a patient, the circumferences of the patella at 6 positions on both knees need to be measured, and each position requires repeated measurement 3 times. A total of 18 measurements are required for one patient at the same time point to ensure the reliability of the data, making the operation of medical staff cumbersome. Summary of the Invention

[0004] The purpose of the present invention is to provide a patella circumference measuring device to solve the problems existing in the above-mentioned prior art and achieve accurate and rapid measurement of the patella circumference.

[0005] To achieve the above purpose, the present invention provides the following solution:

[0006] The present invention provides a patella circumference measuring device, including a bottom plate and at least one set of measurement assemblies. Each measurement assembly includes a slider, a fixed support, a sensor support, a positioning device, a tension sensor, and a wire-drawing displacement sensor. Two parallel guide rails are arranged on the bottom plate. In one set of the measurement assemblies: each of the guide rails is slidably connected with a slider, the fixed support and the sensor support are respectively fixedly connected to the two sliders, the positioning device can lock the positions of the fixed support and the sensor support simultaneously, the tension sensor and the wire-drawing displacement sensor are fixedly arranged on the sensor support, and the measuring wire of the wire-drawing displacement sensor is wound around the measuring wheel of the tension sensor for at least one week and then connected to the fixed support.

[0007] Preferably, the measurement assembly further includes a wire adjusting assembly, which includes a first bracket, a second bracket, an adjusting shaft and an adjusting wheel. The first bracket and the second bracket are fixedly connected to the sensor support. The adjusting shaft freely passes through the first bracket and the second bracket, and the adjusting wheel is fixedly connected to the adjusting shaft.

[0008] Preferably, the positioning device includes a positioning screw. A threaded hole matching the positioning screw is provided on the sensor support, and the free end of the positioning screw can contact the bottom plate.

[0009] Preferably, a pull rod is fixedly provided at each end of the bottom plate.

[0010] Preferably, it further includes fixing tapes. There are two fixing tapes. Each fixing tape includes a connecting portion and a fixing portion fixedly connected to the connecting portion. The two ends of each connecting portion are respectively fixedly connected to the two pull rods, and the fixing portion is used to fix the patient's leg.

[0011] Preferably, the measurement assembly further includes a linkage rod, and the two ends of the linkage rod are respectively fixedly connected to the fixed support and the sensor support.

[0012] Preferably, it further includes a detection circuit. The wire-drawing displacement sensor and the tension sensor are both electrically connected to the detection circuit.

[0013] Preferably, a weight-reducing hole is provided on the bottom plate, and the weight-reducing hole is located between the two guide rails.

[0014] Preferably, the bottom plate is a rectangular bottom plate, the weight-reducing hole is a rectangular hole, and scales are provided on the bottom plate.

[0015] Preferably, a display screen is electrically connected to the detection circuit, and the display screen can display the detection information transmitted by the wire-drawing displacement sensor and the tension sensor to the detection circuit.

[0016] The present invention has achieved the following technical effects compared with the prior art:

[0017] The patella circumference measuring device provided by the present invention, before the measurement operation, adjusts the position of the slider, and uses the positioning device to lock and position the position of the fixed support and / or the sensor support. The measuring wire of the wire-pulling displacement sensor is pulled out from the inside of the wire-pulling displacement sensor, and then wound around the measuring wheel of the tension sensor for 1 week. The tension of the measuring wire can be detected through the tension sensor. After the measuring wire is pulled out from the measuring wheel, a length greater than the patella circumference is reserved, and the measuring wire is arranged in a ring shape. The free end of the measuring wire is fixedly connected to the fixed support. When measuring the patella circumference, the patella of the human body is passed through the ring formed by the measuring wire, and the pulling-out length of the measuring wire from the wire-pulling displacement sensor is adjusted to change the length of the measuring wire between the fixed support and the sensor support, so that the measuring wire surrounding the patella is tightened. The patella circumference can be measured by the wire-pulling displacement sensor, and the patella circumference can be measured under the condition that the measuring wire is in the same tightened state through the tension sensor. The measurement is simple and fast, and the accurate and rapid measurement of the patella circumference is realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 is an axonometric view of the patella circumference measuring device provided by the present invention;

[0020] Figure 2 is a schematic structural diagram of the wire adjustment assembly of the patella circumference measuring device provided by the present invention;

[0021] In the figure: 1 - slider; 2 - guide rail; 3 - pull rod; 4 - fixed support; 5 - measuring wire; 6 - linkage rod; 7 - sensor support; 8 - tension sensor; 81 - measuring wheel; 9 - fixed adhesive tape; 10 - wire-pulling displacement sensor; 11 - adjusting wheel; 111 - adjusting shaft; 112 - first bracket; 113 - second bracket; 12 - detection circuit; 13 - bottom plate; 14 - positioning screw; 15 - weight-reducing hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0023] The object of the present invention is to provide a patella circumference measuring device to solve the problems existing in the above-mentioned prior art and achieve accurate and rapid measurement of the patella circumference.

[0024] To make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0025] As Figures 1 to 2 shown, the present invention provides a patella circumference measuring device. In a specific embodiment of the present invention, the patella circumference measuring device includes a bottom plate 13 and at least one set of measuring assemblies. Each measuring assembly includes a slider 1, a fixed support 4, a sensor support 7, a positioning device, a tension sensor 8 and a wire-drawing displacement sensor 10. Two parallel guide rails 2 are provided on the bottom plate 13. In one set of measuring assemblies: a slider 1 is slidably connected to each of the guide rails 2, the fixed support 4 and the sensor support 7 are respectively fixedly connected to the two sliders 1, the positioning device can lock the positions of the fixed support 4 and the sensor support 7 at the same time, a tension sensor 8 and a wire-drawing displacement sensor 10 are fixedly provided on the sensor support 7. In a specific solution, the wire-drawing displacement sensor 10 is a wire-drawing encoder, and the measuring wire 5 of the wire-drawing displacement sensor 10 is wound around the measuring wheel 81 of the tension sensor 8 for at least one week and then connected to the fixed support 4. More specifically, the measuring wire 5 is a steel wire.

[0026] For the patella circumference measuring device provided by the present invention, before the measurement operation, the position of the slider 1 is adjusted, and the positioning device is used to lock and position the positions of the fixed support 4 and the sensor support 7. The measuring wire 5 of the wire-drawing displacement sensor 10 is pulled out, and then wound around the measuring wheel 81 of the tension sensor 8 for one week. The tension of the measuring wire 5 can be detected through the tension sensor 8. After the measuring wire 5 is pulled out from the measuring wheel 81, a length greater than the patella circumference is reserved, and the measuring wire 5 is arranged in a ring shape. The free end of the measuring wire 5 is fixedly connected to the fixed support 4. When measuring the patella circumference, the leg of the human body is passed through the ring formed by the measuring wire 5, and the ring is located at the position of the patella to be measured. The pulling-out length of the measuring wire 5 from the wire-drawing displacement sensor 10 is adjusted to change the length of the measuring wire 5 between the fixed support 4 and the sensor support 7, so that the measuring wire 5 surrounding the patella is tightened. The patella circumference can be measured by the wire-drawing displacement sensor 10. The tension sensor 8 can ensure that the measuring wire 5 is in the same tightened state for measuring the patella circumference, and the measurement is accurate. Multiple sets of measuring assemblies can simultaneously measure the patella circumferences at multiple positions, improving the measurement efficiency. The measurement is simple and rapid, and accurate and rapid measurement of the patella circumference is achieved.

[0027] In a specific embodiment of the present invention, the measuring assembly of the patella circumference measuring device further includes a wire adjusting assembly. The wire adjusting assembly includes a first bracket 112, a second bracket 113, an adjusting shaft 111 and an adjusting wheel 11. The first bracket 112 and the second bracket 113 are fixedly connected to the sensor support 7. The adjusting shaft 111 freely passes through the first bracket 112 and the second bracket 113, and the adjusting wheel 11 is fixedly connected to the adjusting shaft 111. After the measuring wire 5 is pulled out from the wire-pulling displacement sensor 10, it first winds around the adjusting shaft 111 for 2 to 3 turns, so as to increase the friction for easy adjustment. By manually rotating the adjusting wheel 11, the tightening and loosening of the measuring wire 5 on the patella can be realized, and the precise adjustment of the tension on the measuring wire 5 can be achieved. Thus, the measurement of the patella dimension under the same tension condition can be realized through the tension sensor 8, achieving the purpose of accurately and quickly measuring the patella circumference.

[0028] In a specific embodiment of the present invention, the positioning device of the patella circumference measuring device includes a positioning screw 14. A threaded hole matching the positioning screw 14 is provided on the sensor support 7. The free end of the positioning screw 14 can contact the bottom plate 13. By rotating the positioning screw 14 to make it contact the bottom plate 13, the positioning of the patella measurement position is realized by increasing the moving friction.

[0029] In a specific embodiment of the present invention, for the convenience of carrying, a pull rod 3 is fixedly provided at each end of the bottom plate 13 of the patella circumference measuring device.

[0030] In a specific embodiment of the present invention, for the convenience of measuring the patella circumference and improving the measurement accuracy, the patella circumference measuring device further includes two fixing tapes 9. The fixing tapes 9 include a connecting portion and a fixing portion fixedly connected to the connecting portion. The two ends of each connecting portion are respectively fixedly connected to the two pull rods. The fixing portion is used to fix the patient's leg. The fixing portion is a magic tape. One side of the magic tape is a rough surface, and the other side is a plush surface. One end of the magic tape is fixedly connected to the connecting portion, and the other end of the magic tape is a free end and can be adhered to the magic tape, so as to fix the patient's leg. One fixing tape 9 is used to support and fix the patient's thigh, and the other fixing tape 9 is used to support and fix the patient's calf.

[0031] In a specific embodiment of the present invention, in order to ensure the measurement accuracy and ensure that the fixed support 4 and the sensor support 7 move simultaneously, the measuring assembly of the patella circumference measuring device further includes a linkage rod 6. The two ends of the linkage rod 6 are respectively fixedly connected to the fixed support 4 and the sensor support 7.

[0032] In a specific embodiment of the present invention, in order to facilitate the detection of tension and displacement, the patella circumference measuring device further includes a detection circuit 12. The wire-drawing displacement sensor 10 and the tension sensor 8 are both electrically connected to the detection circuit 12. The wire-drawing displacement sensor 10 transmits the detected displacement information of the measuring wire to the detection circuit, and the tension sensor 8 transmits the detected tension information of the measuring wire to the detection circuit.

[0033] In order to reduce the weight of the patella circumference measuring device, a weight-reducing hole 15 is formed on the bottom plate 13, and the weight-reducing hole 15 is located between the two guide rails 2.

[0034] The bottom plate 13 is a rectangular bottom plate 13, and the weight-reducing hole 15 is a rectangular hole. A scale is provided on the bottom plate 13. Through the scale on the bottom plate 13, the measuring personnel can accurately position the measuring position and achieve accurate measurement of the patella circumference at the same position of the patient.

[0035] An electronic display screen is electrically connected to the detection circuit, and the electronic display screen can display the detection information transmitted by the wire-drawing displacement sensor 10 and the tension sensor 8 to the detection circuit 12.

[0036] Specific examples are used in the present invention to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A patella circumference measuring device, characterized in that: It includes a bottom plate and at least one set of measurement assemblies. Each measurement assembly includes a slider, a fixed support, a sensor support, a positioning device, a tension sensor, and a wire-drawing displacement sensor. Two parallel guide rails are provided on the bottom plate. Within one set of the measurement assemblies: One slider is slidably connected to each of the guide rails. The fixed support and the sensor support are respectively fixedly connected to the two sliders. The positioning device can lock the positions of the fixed support and the sensor support simultaneously. The tension sensor and the wire-drawing displacement sensor are fixedly arranged on the sensor support. The measuring wire of the wire-drawing displacement sensor winds around the measuring wheel of the tension sensor for at least one week and then is connected to the fixed support. After the measuring wire is pulled out by the measuring wheel, a length greater than the circumference of the patella is reserved, and the measuring wire is arranged in a ring shape. When measuring the circumference of the patella, the leg of the human body is passed through the ring formed by the measuring wire, and the ring is located at the position of the patella to be measured. The positioning device includes a positioning screw. A threaded hole matching the positioning screw is provided on the sensor support. The free end of the positioning screw can contact the bottom plate. The tension sensor can ensure that the measuring wire is in the same tension state for measuring the circumference of the patella. Among them, the measurement assembly further includes a wire adjustment assembly. The wire adjustment assembly includes a first bracket, a second bracket, an adjustment shaft, and an adjustment wheel. The first bracket and the second bracket are fixedly connected to the sensor support. The adjustment shaft freely passes through the first bracket and the second bracket. The adjustment wheel is fixedly connected to the adjustment shaft. The measuring wire winds around the adjustment shaft for 2 to 3 weeks after being pulled out from the wire-drawing displacement sensor.

2. The patella circumference measuring device according to claim 1, characterized in that: A pull rod is fixedly provided at each end of the bottom plate.

3. The patella circumference measuring device according to claim 2, wherein: It further includes fixed adhesive tapes. There are two fixed adhesive tapes. Each fixed adhesive tape includes a connecting portion and a fixing portion fixedly connected to the connecting portion. The two ends of each connecting portion are respectively fixedly connected to the two pull rods. The fixing portion is used to fix the leg of the patient.

4. The patella circumference measuring device according to claim 1, wherein: The measurement assembly further includes a linkage rod. The two ends of the linkage rod are respectively fixedly connected to the fixed support and the sensor support.

5. The patella circumference measuring device according to claim 1, characterized in that: It further includes a detection circuit. The wire-drawing displacement sensor and the tension sensor are both electrically connected to the detection circuit.

6. The patella circumference measuring device according to claim 1, wherein: A weight-reducing hole is provided on the bottom plate. The weight-reducing hole is located between the two guide rails.

7. The patella circumference measuring device according to claim 6, characterized in that: The bottom plate is a rectangular bottom plate. The weight-reducing hole is a rectangular hole. Scales are provided on the bottom plate.

8. The patella circumference measuring device according to claim 5, wherein: A display screen is electrically connected to the detection circuit. The display screen can display the detection information transmitted by the wire-drawing displacement sensor and the tension sensor to the detection circuit.

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