Force line monitoring system and method

Abstract

The application discloses a force line monitoring system and method, which comprises a signal transmitter, a signal receiver and a display; the signal transmitter is fixed on the skin of a joint surface and is used for emitting signals; the signal receiver is arranged in a body position pad which can be flatly laid in a supine position; the signal receiver is connected with a power supply and is used for collecting the signals emitted by the signal transmitter and positioning the two-dimensional coordinates of the orthographic projection position of the signal emitting position on the body position pad; the signal receiver is connected with the display through wireless or wired connection, and the display is used for receiving and visually displaying the positioning information of the signal receiver. The application indirectly positions the force line relationship of the joint by positioning the two-dimensional coordinates of the orthographic projection position of the signal emitting position of the signal transmitter on the body position pad, and directly visually displays the force line relationship on the display screen, so that the use of X-ray perspective can be reduced or even avoided, and the operation is convenient.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of medical equipment, and particularly relates to a force line monitoring system and method. BACKGROUND

[0002] The current knee joint around osteotomy needs intraoperative X-ray perspective in the supine position of the patient, the lower limb rotation neutral position, positioning the femoral head center, the knee joint center and the ankle joint center. To determine the relationship between the femoral head center-ankle joint center line (and the lower limb coronal plane mechanical force line) and the knee joint center. According to the individual situation of the patient, the relationship needs to be adjusted intraoperatively to restore the best force line.

[0003] Single X-ray perspective can only observe the position of the anatomical structure at that time, and cannot be monitored in real time, and needs to be repeatedly perspected. Intraoperative X-ray perspective needs to be repeated many times, not only causing radiation exposure of the patient and medical staff, but also increasing the risk of intraoperative pollution and prolonging the operation time, and increasing the risk of complications. At present, there is no other means to replace intraoperative X-ray perspective to determine the femoral head center, the knee joint center and the ankle joint center. SUMMARY

[0004] The technical problem to be solved by the present application is that the force line monitoring in the prior art needs to be repeatedly perspected many times, which is inconvenient to operate, and is easy to cause radiation hazards to the patient and medical staff.

[0005] To solve the above technical problems, the present application provides a force line monitoring system, which comprises a signal emitter, a signal receiver and a display; the signal emitter is fixed at the skin of the joint surface and is used for emitting signals, and the signal receiver is arranged in a body position pad that can be laid in a supine position;

[0006] The signal receiver is connected to a power supply, used for collecting the signals emitted by the signal emitter, and positioning the two-dimensional coordinates of the orthographic position of the emitting position of the signals on the body position pad;

[0007] The signal receiver and the display are connected by wireless or wired connection, and the display is used for receiving and visually displaying the positioning information of the signal receiver.

[0008] Further, the joint comprises a femoral head, an ankle joint and a knee joint.

[0009] Further, the signal emitter comprises a magnetic signal emitter or an infrared signal emitter. The magnetic signal emitter, the infrared signal emitter, the magnetic inductor and the infrared inductor can be directly used as commercially available products, which are low in cost and simple in operation.

[0010] Further, the signal emitter is arranged on a carrier, and the carrier is provided with a fixing part for fixing to the joint.

[0011] Further, the carrier includes a patch carrier and a positioning needle carrier, the positioning needle carrier is fixed at the joint by drilling into the bone with an electric drill. The patch carrier can be directly pasted on the joint surface by adhesive force, so that the signal transmitter in the patch carrier is closely attached to the joint skin; when the positioning needle carrier is used at the knee joint, the error caused by soft tissues such as skin can be eliminated, and the positioning needle carrier is closely attached to the bone surface on both sides of the knee joint, so that the positioning of the medial and lateral points of the tibia and femur of the knee joint is more accurate, and the signal transmitter can be accurately contacted with the knee joint, so that the positioning information obtained is more accurate.

[0012] Further, the positioning needle carrier and the infrared signal transmitter are used at the knee joint. The use of the infrared signal transmitter at the knee joint can avoid the magnetic field interference of the two magnets in the case of small spacing, and improve the accuracy of the positioning information.

[0013] The signal receiver includes a signal receiver, a signal filter, a signal amplifier, a signal processor and a signal transmitter connected in sequence.

[0014] The information acquisition module is used for filtering and collecting the signal.

[0015] The distance sensing module with known two-dimensional coordinates on the body position pad is used for sensing the distance between the signal emitting position and the distance sensing module.

[0016] The calculation module calculates the two-dimensional coordinates of the orthographic projection position of the signal emitting position on the body position pad according to the coordinates of the distance sensing module and the distance.

[0017] The information transmission module is used for transmitting the two-dimensional coordinates of the orthographic projection position of the signal emitting position on the body position pad to the display.

[0018] Further, the distance sensing module includes a magnetic sensor or / and an infrared sensor.

[0019] The connecting line of the distance sensing module on the body position pad forms a right triangle.

[0020] The body position pad is rigid or flexible, and when it is flexible, it needs to be used with a rigid bottom support. The design of the flexible body position pad can make the pad be rolled up like a yoga mat, which is convenient for storage.

[0021] The display includes a processor module, which is used for converting the received two-dimensional coordinates of the orthographic projection position of the signal emitting position on the body position pad into visual image information. The display can directly calculate and display the specific position of the intersection point of the femoral head-ankle center connecting line and the medial and lateral connecting line of the knee joint on the medial and lateral connecting line of the knee joint.

[0022] To solve the above technical problems, the application further provides a force line monitoring method, which includes the following steps:

[0023] 1) signal transmitter fixed at the skin of the joint surface emits signals;

[0024] 2) signal receiver arranged in the body position pad lying in the supine position collects the signals emitted by the signal transmitter, locates the two-dimensional coordinates of the orthographic projection position of the signal emitting position on the body position pad, and transmits the positioning information to the display;

[0025] 3) the display receives and visually displays the positioning information;

[0026] 4) the force line relationship is monitored through the positioning information displayed on the display.

[0027] Further, the joint includes the femoral head, the ankle joint, and the knee joint, etc.

[0028] The two-dimensional coordinates of the orthographic projection position of the signal transmitter on the body position pad are the two-dimensional coordinates of the orthographic projection position of the joint on the body position pad, and the two-dimensional coordinates of the orthographic projection position of the joint on the body position pad can be indirectly calculated by using the above method. Finally, the two-dimensional coordinate information of the orthographic projection of the joint is transmitted to the display, and the doctor can directly observe the joint force line information of the patient on the screen of the display, which is convenient to operate and avoids the use of X-rays.

[0029] The signal transmitter in step 1) includes a magnetic signal transmitter or an infrared signal transmitter.

[0030] Further, the signal transmitter is arranged on a carrier, and the carrier is provided with a fixing part for fixing to the joint.

[0031] Further, the carrier includes a patch carrier and a positioning needle carrier, and the positioning needle carrier is drilled into the bone to be fixed at the joint by an electric drill.

[0032] Further, the positioning needle carrier and the infrared signal transmitter are used at the knee joint.

[0033] The signal receiver includes an information collection module, a distance sensing module, a calculation module, and an information transmission module connected in sequence;

[0034] The step 2) includes:

[0035] A. turn on the power, and the information collection module filters and collects the signals;

[0036] B. the distance sensing module senses the distance between the signal emitting position and the distance sensing module;

[0037] C. the calculation module calculates the two-dimensional coordinates of the orthographic projection position of the signal emitting position on the body position pad according to the coordinates of the distance sensing module and the distance;

[0038] D. The information transmission module transmits the two-dimensional coordinates of the normal projection position of the signal emitting position on the body position pad to the display through wired or wireless mode.

[0039] Further, the distance sensing module comprises a magnetic sensor or / and an infrared sensor.

[0040] The connecting line of the distance sensing module on the body position pad is a right triangle.

[0041] The body position pad is rigid or flexible, and the flexible body position pad is used in cooperation with a rigid bottom support.

[0042] The display comprises a processor module, and the step 3) is that the processor module converts the received positioning information into visual image information and displays on the display screen.

[0043] The present application has the following beneficial effects:

[0044] The present application indirectly positions the force line relationship by positioning the two-dimensional coordinates of the normal projection position of the signal emitting position of the signal emitter on the body position pad, and directly visualizes the force line relationship on the display screen, thereby reducing or even avoiding the use of X-ray perspective. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 Fig. 1 is a schematic diagram of force line monitoring of a human body.

[0046] Figure 2 Fig. 3 is a schematic diagram of the module of the force line monitoring device.

[0047] Figure 3 Fig. 5 is a schematic diagram of the force line relationship displayed on the display, wherein the dashed circle represents the specific position relationship of the intersection point of the femoral head-ankle center connecting line and the medial and lateral knee connecting line on the medial and lateral knee connecting line.

[0048] Figure 4 Fig. 7 is a schematic diagram of the calculation principle of the two-dimensional coordinates of the normal projection position of the signal emitting position on the body position pad. DETAILED DESCRIPTION

[0049] The technical solutions claimed in the present application are further described in detail below in combination with the drawings and specific examples.

[0050] Example 1

[0051] As shown in Figures 1 to 3 The force line monitoring system provided by the application comprises a signal transmitter, a signal receiver and a display. The signal transmitter is fixed on the skin surface of a joint (for example, the femoral head, ankle joint and knee joint) and is used for transmitting signals, specifically, the signal transmitter is coincided with the center of the joint in the front and back projection position. The signal receiver is arranged in a body position pad in a supine position. The signal receiver is connected to a power supply, used for collecting the signals transmitted by the signal transmitter, and positioning the two-dimensional coordinates of the orthographic projection position of the signal transmission position on the body position pad. The signal receiver is connected to the display through wireless (for example, through Bluetooth or WIFI) or wired connection, and the display is used for receiving and visually displaying the positioning information of the signal receiver.

[0052] Specifically, the signal transmitter can use a commercially available magnetic signal transmitter (for example, a commercially available neodymium iron boron magnet), which is arranged on a carrier. The carrier can adopt a patch form (similar to an electrocardiogram electrode patch), and the magnetic signal transmitter can be arranged in the patch. In use, the magnetic signal transmitter in the patch is coincided with the center of the joint in the front and back position. Of course, a bandage or a magic tape can also be used instead of the patch, as long as the sensor can be firmly fixed to the body surface and not easily loose.

[0053] The signal receiver comprises, which are electrically connected in sequence:

[0054] An information collection module, used for filtering and collecting the signals;

[0055] A distance sensing module, used for sensing the distance between the signal transmission position and the distance sensing module, wherein the two-dimensional coordinates of the body position pad are known;

[0056] A calculation module, used for calculating the two-dimensional coordinates of the orthographic projection position of the signal transmission position on the body position pad according to the coordinates of the distance sensing module and the distance;

[0057] And an information transmission module, used for transmitting the two-dimensional coordinates of the orthographic projection position of the signal transmission position on the body position pad to the display;

[0058] The distance sensing module is arranged as a magnetic sensor (for example, a magnetic sensor of Honeywell Company) corresponding to the magnetic signal transmitter, and the connecting line of the distance sensing module on the body position pad forms a right triangle.

[0059] In the process, the two-dimensional coordinates of the orthographic projection position of the magnetic signal emitting position on the body position pad are the two-dimensional coordinates of the orthographic projection position of the joint on the body position pad. The joint position can be indirectly located on the body position pad by orthographic projection using the above method. Finally, the positioning information of the joint orthographic projection can be transmitted to the display by the information transmission module. The doctor can directly observe the joint force line information of the patient on the screen of the display, which is convenient to operate and avoids the use of X-rays.

[0060] The body position pad is rigid or flexible (similar to a yoga mat). When it is flexible, it needs to be used with a rigid bottom support to ensure that the sensing pad will not bend due to body weight pressure. The display includes a processor module for converting the received positioning information into visual image information.

[0061] Taking the surgical process as an example, the method for force line monitoring using the force line monitoring system is as follows:

[0062] (1) The body position pad with signal receivers is laid on the operating bed, and then the patient lies on the body position pad in a supine position. Keep the lower limbs in a neutral rotation position. Determine the centers of the ankle joint and the femoral head by X-ray anteroposterior perspective, and paste the patches on the corresponding skin positions to make the magnetic signal emitters in the patches coincide with the centers of the ankle joint and the femoral head in the anteroposterior position. Determine the inner and outer positions of the tibial plateau or the inner and outer positions of the femoral condyle by X-ray anteroposterior perspective, and paste the patches on the corresponding skin surfaces to make the magnetic signal emitters in the inner and outer patches respectively coincide with the inner and outer positions of the tibial plateau or the inner and outer positions of the femoral condyle in the anteroposterior position.

[0063] (2) The magnetic signal emitters fixed at the joints emit magnetic signals;

[0064] (3) Turn on the power, and the information acquisition module filters and acquires the signals;

[0065] (4) The distance sensing module senses the distance between the signal emitting position and the distance sensing module; wherein the distance sensing module uses a magnetic sensor corresponding to the magnetic signal emitter;

[0066] (5) The computing module calculates the two-dimensional coordinates of the orthographic projection position of the signal emitting position on the body position pad according to the coordinates of the distance sensing module and the distance;

[0067] (6) The information transmission module transmits the two-dimensional coordinates of the orthographic projection position of the signal emitting position on the body position pad to the display through wired or wireless means. The display can directly display the specific position of the intersection point of the femoral head-ankle joint center connecting line and the inner and outer knee joint connecting line on the inner and outer knee joint connecting line.

[0068] (7) The processor module in the monitor converts the received positioning information into visualized image information and displays it on the screen. Doctors observe, monitor, and calculate force line relationships by viewing the positioning information displayed on the monitor. Specifically, the monitor can directly display the exact location of the intersection of the femoral head-ankle joint center line and the medial and lateral lines of the knee joint on the medial and lateral lines of the knee joint, such as 50%, 40% medially, or 60% laterally.

[0069] The distance sensing module is as follows Figure 4 As shown, three distance sensors are placed on the positioning pad, forming a right-angled triangle. A two-dimensional coordinate system is established with the right-angle vertex of this triangle as the origin, and the two sides as the X-axis and Y-axis, respectively. The distances between the sensor located at the right-angle vertex and the other two sensors are known, e and d, respectively. The distances between the signal transmitter fixed to the patient's body surface and the three sensors can be measured by the sensors, and are a, b, and c, respectively. The two-dimensional coordinates of the signal transmitter's orthographic projection position on the positioning pad can be calculated using Heron's formula and the Pythagorean theorem.

[0070] set up

[0071] From Heron's formula, we can obtain:

[0072]

[0073] therefore,

[0074] Using the above principle, the orthographic coordinates and relative positions of the signal transmitters fixed at the center of the femoral head, the center of the ankle joint, and the inner and outer skin surfaces of the knee joint can be obtained on the two-dimensional coordinate system of the positioning pad.

[0075] Example 2

[0076] like Figures 1 to 3 As shown, the force line monitoring system provided by the present invention includes a signal transmitter, a signal receiver, and a display. The signal transmitter is fixed to the skin surface of a joint (e.g., femoral head, ankle joint, and knee joint) and is used to transmit signals. Specifically, the signal transmitter coincides with the joint center in the anterior-posterior projection position. The signal receiver is placed in a positioning pad for supine lying position. The signal receiver is connected to a power source and is used to collect the signals emitted by the signal transmitter and locate the two-dimensional coordinates of the orthographic projection position of the signal transmission position on the positioning pad. The signal receiver and the display are connected wirelessly (e.g., via Bluetooth or WIFI) or wiredly, and the display is used to receive and visualize the positioning information of the signal receiver.

[0077] Specifically, at the femoral head, ankle joint, the signal transmitter can use a commercially available magnetic signal transmitter (for example, a commercially available neodymium iron boron magnet) arranged on a carrier. The carrier can adopt a patch form (similar to an electrocardiogram monitoring electrode patch), and the magnetic signal transmitter can be arranged in the patch. During use, the magnetic signal transmitter in the patch is overlapped with the joint center in the front and back positions. Of course, a bandage or a magic tape can be used instead of the patch, as long as the sensor can be fixed firmly on the body surface and is not easy to loosen. At the knee joint, an infrared signal transmitter is used. A commercially available infrared signal transmitter is fixed on a positioning needle made of metal, similar to a Kirschner wire, which is drilled into the medial or lateral tibial plateau or the medial or lateral femoral condyle.

[0078] The signal receiver includes a signal acquisition module, a distance sensing module, a calculation module and an information transmission module.

[0079] The signal acquisition module is used to filter and collect the signals.

[0080] The distance sensing module is used to sense the distance between the signal transmitting position and the distance sensing module.

[0081] The calculation module is used to calculate the two-dimensional coordinates of the orthographic projection position of the signal transmitting position on the body position pad according to the coordinates of the distance sensing module and the distance.

[0082] The information transmission module is used to transmit the two-dimensional coordinates of the orthographic projection position of the signal transmitting position on the body position pad to the display.

[0083] The distance sensing module is arranged as a magnetic sensor (for example, a magnetic sensor of Honeywell Company) and an infrared signal sensor corresponding to the magnetic signal transmitter and the infrared signal transmitter, respectively. The connecting line of the distance sensing module on the body position pad forms a right triangle.

[0084] In this process, the two-dimensional coordinates of the orthographic projection position of the signal transmitting position on the body position pad are the two-dimensional coordinates of the orthographic projection position of the joint on the body position pad. The joint position can be indirectly positioned on the body position pad by orthographic projection using the above method. Finally, the positioning information of the joint orthographic projection can be transmitted to the display by the information transmission module. The doctor can observe the joint force line information of the patient on the screen of the display intuitively, which is convenient to operate and avoids the use of X-ray.

[0085] The body position pad is arranged as rigid or flexible (similar to a yoga mat). When arranged as flexible, it needs to be used with a rigid bottom support to ensure that the sensing pad will not bend due to body weight pressure. The display includes a processor module, which is used to convert the received positioning information into visual image information.

[0086] Taking a surgical procedure as an example, the method for force line monitoring using the force line monitoring system is as follows:

[0087] (1) A body position pad with a signal receiver is laid on a surgical bed, and then a patient is laid on the body position pad in a supine position. The lower limbs are kept in a neutral rotation position, and the centers of the ankle joint and the femoral head are determined by X-ray anteroposterior perspective, and the patches are pasted on the corresponding skin positions, so that the magnetic signal emitters in the patches coincide with the centers of the ankle joint and the femoral head in the anteroposterior position. The positioning needles are used on the medial and lateral sides of the tibial plateau of the knee joint or the medial and lateral sides of the femoral condyle, so that the infrared signal emitters on the medial and lateral positioning needles respectively coincide with the medial and lateral sides of the tibial plateau of the knee joint or the medial and lateral sides of the femoral condyle in the anteroposterior position, and the power supply of the infrared emitters is connected;

[0088] (2) The signal emitters fixed at the joints emit signals;

[0089] (3) The power supply is turned on, and the information collection module filters and collects the signals;

[0090] (4) The distance sensing module senses the distance between the signal emitting position and the distance sensing module; wherein the distance sensing module uses a magnetic sensor or an infrared signal sensor corresponding to the magnetic signal emitter or the infrared signal emitter;

[0091] (5) The calculation module calculates the two-dimensional coordinates of the orthographic projection position of the signal emitting position on the body position pad according to the coordinates of the distance sensing module and the distance;

[0092] (6) The information transmission module transmits the two-dimensional coordinates of the orthographic projection position of the signal emitting position on the body position pad to the display through wired or wireless means. The display can directly display the specific position of the intersection point of the femoral head-ankle center connecting line and the medial and lateral connecting lines of the knee joint on the medial and lateral connecting lines of the knee joint.

[0093] (7) The processor module in the display converts the received positioning information into visual image information and displays it on the display screen. The doctor observes, monitors and calculates the force line relationship by displaying the positioning information on the display. Wherein, the display can directly calculate and display the specific position of the intersection point of the femoral head-ankle center connecting line and the medial and lateral connecting lines of the knee joint on the medial and lateral connecting lines of the knee joint, such as 50%, medial 40% or lateral 60%.

[0094] Wherein the distance sensing module is as follows: Figure 4As shown, 3 distance sensors are placed on the body position pad, and the connection is in the shape of a right triangle, and a two-dimensional coordinate system is established with the right angle vertex of the right triangle as the origin, and the two sides as the X-axis and Y-axis. The distance between the sensor at the right angle vertex and the other two sensors is known, and is e and d respectively. The distance between the signal transmitter fixed on the patient's body surface and the three sensors can be measured by the sensor, and is a, b, and c respectively. The two-dimensional coordinates of the signal transmitter and the orthographic projection position on the body position pad can be calculated by combining the Hailun formula and the Pythagorean theorem:

[0095] Let

[0096] From the Hailun formula, we have:

[0097]

[0098] Therefore,

[0099] Using the above principle, the orthographic projection coordinates and relative positions of the signal transmitters fixed on the center of the femoral head, the center of the ankle joint, and the skin surface inside and outside the knee joint on the two-dimensional coordinate system of the body position pad can be obtained.

[0100] The present application indirectly locates the force line relationship by locating the two-dimensional coordinates of the orthographic projection position of the signal emission position of the signal transmitter on the body position pad, and directly visualizes the force line relationship on the display screen, which can reduce or even avoid the use of X-ray perspective, can be used in surgery, realizes real-time monitoring, is easy to operate, effectively shortens the operation time, and reduces surgical pollution.

[0101] Since the system structure and operation are simple, the patient can also use it independently (at home) after complete configuration, avoiding multiple postoperative hospital reviews, and the design of the flexible body position pad can make the pad roll up like a yoga mat, which is beneficial for storage. The system can be further expanded to monitor other structures except human force lines, and can be applied to pet medical treatment, and has wide application.

[0102] The above-described embodiments are only exemplary descriptions of the present application and do not limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements to the technical solutions of the present application made by those skilled in the art shall fall within the protection scope determined by the claims of the present application.

Claims

1. A force line monitoring system, characterized in that The system comprises a signal transmitter, a signal receiver and a display; the signal transmitter is fixed at the skin surface of the joint and used for transmitting signals, and the signal receiver is arranged in a body position pad that can be flatly laid in a supine position; The signal receiver is connected to a power supply, used for collecting the signals transmitted by the signal transmitter, and positioning the two-dimensional coordinates of the orthographic projection position of the signal transmission position on the body position pad; The signal receiver is connected to the display through wireless or wired connection, and the display is used for receiving and visually displaying the positioning information of the signal receiver; The signal receiver comprises, in sequence and electrically connected: An information collection module, used for filtering and collecting the signals; A distance sensing module with known two-dimensional coordinates on the body position pad, used for sensing the distance between the signal transmission position and the distance sensing module; A calculation module, used for calculating the two-dimensional coordinates of the orthographic projection position of the signal transmission position on the body position pad according to the coordinates of the distance sensing module and the distance; And an information transmission module, used for transmitting the two-dimensional coordinates of the orthographic projection position of the signal transmission position on the body position pad to the display; The distance sensing module comprises a magnetic sensor or an infrared sensor.

2. The flow line monitoring system of claim 1, wherein, The signal transmitter comprises a magnetic signal transmitter or an infrared signal transmitter; The signal transmitter is arranged on a carrier, and the carrier is provided with a fixing part for fixing to the joint; The carrier comprises a patch carrier and a positioning needle carrier, and the positioning needle carrier is fixed at the joint by drilling into the bone with an electric drill; The positioning needle carrier and the infrared signal transmitter are used for the knee joint.

3. The flow line monitoring system of claim 1, wherein, The connection line of the distance sensing module on the body position pad forms a right-angled triangle; The body position pad is flexible and is used in cooperation with a rigid bottom support.

4. The flow line monitoring system of claim 1, wherein, The display comprises a processor module, which is used for converting the received two-dimensional coordinates of the orthographic projection position of the signal transmission position on the body position pad into visual image information.

5. A method of monitoring a force line, characterized by The method comprises the following steps: 1) The signal transmitter fixed at the skin surface of the joint transmits signals; 2) The signal receiver arranged in the body position pad that can be flatly laid in a supine position collects the signals transmitted by the signal transmitter, positions the two-dimensional coordinates of the orthographic projection position of the signal transmission position on the body position pad, and transmits the positioning information to the display; 3) The display receives and visually displays the positioning information; 4) The force line relationship data is generated through the positioning information displayed on the display, and the data is used for assisting in monitoring the joint force line state; The signal receiver comprises, in sequence and electrically connected: an information collection module, a distance sensing module with known two-dimensional coordinates on the body position pad, a calculation module and an information transmission module; The step 2) comprises: A. Turn on the power supply, and the information collection module filters and collects the signals; B. The distance sensing module with known two-dimensional coordinates on the body position pad senses the distance between the signal transmission position and the distance sensing module; C. The calculation module calculates the two-dimensional coordinates of the orthographic projection position of the signal transmission position on the body position pad according to the coordinates of the distance sensing module and the distance; D. the information transmission module transmits the two-dimensional coordinates of the orthographic projection position of the signal emitting position on the body position pad to a display through wired or wireless means; The distance sensing module comprises a magnetic sensor or an infrared sensor.

6. The flow line monitoring method of claim 5, wherein, The signal emitter in step 1) comprises a magnetic signal emitter or an infrared signal emitter; The signal emitter is arranged on a carrier, and the carrier is provided with a fixing part for fixing to a joint; The carrier comprises a patch carrier and a positioning needle carrier, and the positioning needle carrier is fixed to the joint by drilling into bone with an electric drill; The positioning needle carrier and the infrared signal emitter are used at the knee joint.

7. The flow line monitoring method of claim 5, wherein, The connecting lines of the distance sensing module on the body position pad form a right-angled triangle; The body position pad is arranged to be rigid or flexible, and the body position pad is used in cooperation with a rigid bottom support when being flexible.

8. The flow line monitoring method of claim 5, wherein, The display comprises a processor module, and step 3) is that the processor module converts the received positioning information into visual image information and displays the visual image information on a display screen.

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