Positioning device and method for right heart catheter examination pressure measuring transducer

Abstract

The invention discloses a positioning device and method for a right heart catheter examination and pressure measurement transducer, belongs to examination and pressure measurement of a right heart catheter in the technical field of electrocardio detection, and aims to solve the technical problems of tedious positioning and low positioning precision existing in zero point positioning of an existing transducer. The device comprises a bed surface, a mounting frame, a lifting screw rod, an RFID reader, a lower RFID tag and an upper RFID tag, the RFID reader transmits a radio frequency signal, and the lower RFID tag and the upper RFID tag are activated after receiving the signal and return a response signal; and the RFID reader receives the response signal, respectively calculates the distance between the lower RFID tag and the RFID reader and the distance between the upper RFID tag and the RFID reader according to the time from the emission of the radio frequency signal to the reception of the response signal, and calculates and determines the position of the fixing frame according to the distances between every two of the RFID reader, the lower RFID tag and the upper RFID tag. Only the RFID reader needs to be placed in the whole positioning process, the procedure of transducer zero point positioning is greatly simplified, the positioning process is simpler and more convenient, and the positioning accuracy is high.

Description

Technical Field

[0001] The present invention belongs to the technical field of electrocardiogram detection, and relates to the inspection and pressure measurement of a right heart catheter, and particularly relates to a positioning device and method for a pressure transducer in right heart catheter inspection and pressure measurement. Background Art

[0002] Right heart catheter inspection and pressure measurement is an invasive inspection method mainly used for measuring the pressures at various parts of the right heart system to evaluate cardiac function and diagnose cardiovascular diseases. In order to accurately measure the pressures in the right atrium, right ventricle, pulmonary artery and its branches, understand the pressure relationships between the chambers and blood vessels of the heart, and determine whether there are abnormally elevated or decreased pressures, a transducer is usually used for pressure measurement. A transducer is a key device that converts a pressure signal into an electrical signal for pressure measurement.

[0003] Before using a transducer for pressure measurement, transducer positioning is required, that is, determining the transducer zero point. The transducer zero point, that is, the horizontal reference point of the heart; for the transducer zero point, the well-known reference level is the midpoint of the right atrium, that is, the position corresponding to the level of the midaxillary line at the fourth intercostal space in the supine position. In medical practice, medical staff will first place the patient supine on the bed, find the patient's fourth rib, find the intersection of the fourth rib and the midaxillary line, translate this intersection to an installation rack (such as an infusion rack) on one side of the bed and install the transducer at this position, and then connect the right heart catheter to the transducer through devices such as a three-way valve. When the patient's body position changes during the detection or treatment process, the transducer zero point positioning needs to be performed again.

[0004] When medical staff determine the transducer zero point position based on the position of the fourth rib by naked eye and experience, there is a problem of low positioning accuracy. For this reason, the invention patent application with the application number 202310417946.7 discloses a CVP transducer positioning method, system and electronic device based on triangular positioning. It determines a triangular plane through the position sensors of three electrode plate structures, can determine the heart horizontal position through a certain algorithm, and quickly adjusts the transducer mounting plate on the infusion rack according to this horizontal position to make the transducer zero point consistent with the heart horizontal position. It can quickly and accurately keep the transducer zero point and the heart at the same level, reduce the workload of calibrating the transducer zero point after changing the body position clinically; reduce the pipelines on the bed, making the bed unit clean and orderly; and more accurately reflect the true values of the patient.

[0005] Although the above-mentioned invention patent application can achieve the positioning of the transducer zero point and make the transducer zero point coincide with the horizontal position of the heart, this method requires deploying position sensors at the intersection of the midaxillary line on both sides of the body position and the fourth intercostal space and on the body surface directly above the heart at the same time, which greatly increases the workload of medical staff and makes the positioning of the transducer more cumbersome. The installation positions of the position sensors are mainly determined by medical staff based on experience, and the positioning accuracy of the transducer is relatively low. Summary of the Invention

[0006] The purpose of the present invention is to provide a positioning device and method for a right heart catheterization pressure measurement transducer to solve the technical problems of cumbersome positioning and low positioning accuracy existing in the existing transducer zero point positioning.

[0007] To achieve the above purpose, the present invention specifically adopts the following technical solutions: A positioning device for a right heart catheterization pressure measurement transducer includes a bed surface and a mounting frame arranged on the bed surface; it also includes an RFID reader placed on the patient, and lower RFID tags and upper RFID tags respectively installed at the bottom and top of the mounting frame; a lifting lead screw is sleeved inside the mounting frame, and a fixed frame that can move axially along the mounting frame is sleeved on the lifting lead screw. The RFID reader emits radio frequency signals. After the lower RFID tags and upper RFID tags receive the radio frequency signals, they are activated and return response signals containing their own coding information. The RFID reader respectively receives the response signals returned by the lower RFID tags and upper RFID tags, calculates the distances between the lower RFID tags and the RFID reader, and between the upper RFID tags and the RFID reader according to the time from emitting the radio frequency signal to receiving the response signal, and calculates and determines the position of the fixed frame based on the distances between the lower RFID tags and the RFID reader, between the upper RFID tags and the RFID reader, and between the lower RFID tags and the upper RFID tags.

[0008] Further, an inner connection hole is provided inside the mounting frame, and the lifting lead screw is sleeved inside the mounting frame through the inner connection hole. An L-shaped connecting piece is provided on the back of the fixed frame. A threaded through hole is provided at the threaded connection end of the L-shaped connecting piece. The L-shaped connecting piece is sleeved on the lifting lead screw through the threaded through hole and is threadedly connected to the lifting lead screw.

[0009] Further, a receiving hole coaxial with the inner connection hole is provided inside the mounting frame. An installation groove is provided on the mounting frame along the axial direction of the mounting frame. The installation groove communicates with the receiving hole. The threaded connection end of the L-shaped connecting piece extends into the receiving hole through the installation groove. The lifting lead screw passes through the inner connection hole and the threaded through hole and is threadedly connected to the L-shaped connecting piece through the threaded through hole.

[0010] Further, the fixing frame includes a fixing substrate connected to the mounting frame. Connecting plates are arranged on both sides of the fixing substrate. Back plates are arranged on the opposite sides of the other ends of the two connecting plates, and a U-shaped area for clamping the transducer is formed at both ends of the fixing substrate; a support plate is arranged in the middle of the inner bottom of the two connecting plates, and a clamping area for placing the side of the transducer is formed between the support plate and the fixing substrate.

[0011] Further, a moving chute is formed in the fixing substrate, and the connecting end of the connecting plate extends into the moving chute; a clamping screw rod is sleeved in the fixing substrate along the length direction of the fixing substrate. The thread directions at both ends of the clamping screw rod are opposite, and both ends of the clamping screw rod are respectively threadedly connected to the connecting ends of the two connecting plates.

[0012] A positioning method for a right heart catheterization pressure measurement transducer includes the above-mentioned right heart catheterization pressure measurement transducer positioning device; when using the right heart catheterization pressure measurement transducer positioning device for positioning, the specific steps are as follows: Step 1, place the RFID reader at the position of the fourth rib of the patient in the supine position; Step 2, turn on the RFID reader and emit a radio frequency signal, and record the time t 1 ; The lower RFID tag and the upper RFID tag receive the radio frequency signal and are activated. The lower RFID tag and the upper RFID tag emit response signals containing their own coding information; the RFID reader respectively receives the response signals of the lower RFID tag and the upper RFID tag, and records the time t 2 、t 3 ; Step 3, calculate the distance L2 between the RFID reader and the lower RFID tag according to the time t 1 、t 2 , and calculate the distance L1 between the RFID reader and the upper RFID tag according to the time t 1 、t 3 ; Step 4, calculate the height of the projection D point of the RFID reader on the mounting frame : ; ; Among them, represents the distance between the lower RFID tag and the upper RFID tag, represents the distance from the projection D point to the upper RFID tag; Step 5, move the fixing frame so that the height of the transducer is half of the height .

[0013] The beneficial effects of the present invention are as follows: 1. In the present invention, by installing two RFID tags on the mounting rack, placing the RFID reader at the position of the fourth rib of the patient in the supine position, calculating the distance between the RFID tags and the RFID reader, and combining the distance between the two RFID tags, the height information of the RFID reader in the vertical direction can be calculated, thereby adjusting the position of the fixing rack and the transducer thereon. The entire positioning process only requires placing the RFID reader, greatly simplifying the procedure of zero-point positioning of the transducer, and making the positioning process more convenient; during the entire positioning process, medical staff only need to touch the fourth rib of the patient to determine the installation position of the RFID reader, and the error introduced in the whole process is small, which can greatly improve the positioning accuracy of the zero point of the transducer.

[0014] 2. In the present invention, by rotating the lifting lead screw, the lifting of the fixing rack and the transducer installed thereon can be driven. The position of the fixing rack and the transducer installed thereon can be accurately controlled by accurately controlling the rotation angle of the lifting lead screw during the whole process, improving the positioning accuracy of the zero point of the transducer.

[0015] 3. In the present invention, the fixing rack adopts a two-sided concave structure composed of a fixing substrate, a connecting plate and a back plate, which is used to clamp the side of the transducer, and a support plate is arranged at the bottom to support the whole transducer body, so that the transducer can be conveniently and quickly installed on the fixing rack, and it is convenient and quick to take and place, and it is not easy to fall off. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a schematic structural diagram of the present invention; Figure 3 is a schematic diagram of the positions of the RFID tags and the RFID reader in the present invention; Figure 4 is a schematic structural diagram of the mounting rack in the present invention; Figure 5 is a schematic connection diagram of the fixing rack and the L-shaped connecting piece in the present invention; Figure 6 is a schematic structural diagram of the fixing rack in the present invention; Figure 7 is a schematic structural diagram after the two connecting plates move a certain distance towards each other in the present invention; Figure 8 is a schematic structural diagram of the transducer and the fixing rack in the present invention; Figure 9 is a schematic diagram of the positioning principle in the present invention; Among them, the reference numerals are: 1 - Bed surface, 2 - Patient, 3 - RFID reader, 4 - Lower RFID tag, 5 - Mounting bracket, 6 - Upper RFID tag, 7 - Lifting screw rod, 8 - Lifting handle, 9 - Fixed bracket, 10 - Inner connection hole, 11 - L-shaped connecting piece, 12 - Transducer, 13 - Threaded through hole, 14 - Mounting groove, 15 - Accommodating hole, 91 - Fixed base plate, 92 - Clamping area, 93 - Clamping handle, 94 - Clamping screw rod, 95 - Back plate, 96 - Connecting plate, 97 - Support plate, 98 - Moving chute, 121 - Interface, 122 - Panel, 123 - Transducer body, 124 - Side. Detailed implementation mode

[0017] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention.

[0018] Therefore, based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0019] Embodiment 1 This embodiment provides a positioning device for a right heart catheterization pressure measurement transducer, which is used to accurately position the zero point of the transducer and install the transducer on one side of the bed surface. It includes a bed surface 1, a mounting bracket 5, a lower RFID tag 4, an upper RFID tag 6, a lifting screw rod 7, and a fixed bracket 9, and the overall structure is as Figure 1-2 shown.

[0020] The bed surface can be a hospital bed, an operating table, or the bed surface of other beds for detection and diagnosis. It is mainly used for the patient 2 to lie on his back during right heart catheterization pressure measurement.

[0021] A mounting bracket 5 arranged in the vertical direction is installed on the side of the bed surface 1 near the head. The mounting bracket 5 is installed on the bed surface 1 by a quick-release structure (using existing technology). It is mainly used to install some detection devices and can also be used as an infusion stand at the same time.

[0022] As Figure 3As shown in the figure, it further includes an RFID reader 3 for distance detection during the transducer positioning process, a lower RFID tag 4, and an upper RFID tag 6. Among them, the RFID reader 3 is placed at the position of the fourth rib on the abdomen of the supine patient 2 during detection and positioning; the lower RFID tag 4 and the upper RFID tag 6 are respectively installed at the bottom and top of the mounting frame 5. After installing the tags, the distance L3 between the lower RFID tag 4 and the upper RFID tag 6 can be measured. And the detection point of the lower RFID tag 4 is flush with the top surface of the bed surface 1, that is, the transducer zero point. And the upper RFID tag 6 is set at the top, so that during positioning, the top position of the fourth rib of most patients (that is, the position for placing the RFID reader 3) is located between the lower RFID tag 4 and the upper RFID tag 6 for subsequent calculation.

[0023] An inner connection hole 10 extending inward along its axis is provided at the top of the mounting frame 5. An elevating lead screw 7 is arranged along the axial direction of the inner connection hole 10 in the inner connection hole 10, and the end of the elevating lead screw 7 extends out of the mounting frame 5. For driving the elevating lead screw 7, an elevating handle 8 can be provided at the top of the elevating lead screw 7, and the elevating lead screw 7 is driven to rotate coaxially by rotating the elevating handle 8; alternatively, a servo motor and a transmission mechanism (such as a gear set) can be provided, and the elevating lead screw 7 is rotated by accurately controlling the rotation angle of the servo motor, so that the fixing frame 9 moves to the specified position (the servo motor and the transmission mechanism can directly apply the existing technology).

[0024] A fixing frame 9 for fixing the transducer 12 is provided on the mounting frame 5. The fixing frame 9 passes through the slot on the mounting frame 5 and extends into the mounting frame 5 and is threadedly connected with the elevating lead screw 7. By rotating the elevating lead screw 7, the fixing frame 9 can be driven to move axially on the mounting frame 5, thereby adjusting the height of the transducer 12.

[0025] As Figure 9 shown, the transducer 12 includes a transducer body 123. A detachable panel 122 is arranged in the groove on the front surface of the transducer body 123. Through the detachable panel 122, the relevant devices in the transducer body 123 can be replaced conveniently and quickly. Side edges 124 bulge outwards on both sides of the transducer body 123. Interfaces 121 for connecting corresponding pipes are arranged at the upper and lower positions on the back surface of the transducer body 123.

[0026] When performing the zero-point positioning of the transducer, the RFID reader 3 emits a radio frequency signal. After receiving the radio frequency signal, the lower RFID tag 4 and the upper RFID tag 6 are respectively activated and return response signals containing their own coding information. The RFID reader 3 respectively receives the response signals returned by the lower RFID tag 4 and the upper RFID tag 6, calculates the distance L2 between the lower RFID tag 4 and the RFID reader 3 and the distance L1 between the upper RFID tag 6 and the RFID reader 3 according to the time from emitting the radio frequency signal to receiving the response signal, and calculates based on the distance L2 between the lower RFID tag 4 and the RFID reader 3, the distance L1 between the upper RFID tag 6 and the RFID reader 3, and the distance L3 between the lower RFID tag 4 and the upper RFID tag 6, and determines the position of the fixing bracket 9, so as to rotate the lifting screw rod 7 to adjust the fixing bracket 9 to the corresponding position.

[0027] Embodiment 2 Based on Embodiment 1, as Figure 4-5 shown, an L-shaped connecting piece 11 is fixedly connected to the back of the fixing bracket 9. A threaded through hole 13 is opened at the end (i.e., the threaded connection end) of the L-shaped connecting piece 11, and the threaded through hole 13 is coaxial with the inner connection hole 10. The lifting screw rod 7 sequentially passes through the inner connection hole 10 and the threaded through hole 13 and is threadedly connected to the L-shaped connecting piece 11 through the threaded through hole 13.

[0028] Preferably, a receiving hole 15 is opened in the mounting bracket 5. The receiving hole 15 is arranged between the lower RFID tag 4 and the upper RFID tag 6. The receiving hole 15 is coaxially arranged with the inner connection hole 10, and the diameter of the receiving hole 15 is larger than the diameter of the inner connection hole 10. An installation groove 14 is opened in the mounting bracket 5. The installation groove 14 is arranged corresponding to the position of the receiving hole 15, and the installation groove 14 communicates with the receiving hole 15. The threaded connection end of the L-shaped connecting piece 11 sequentially extends into the installation groove 14 and the receiving hole 15 and is threadedly connected to the lifting screw rod 7 in the receiving hole 15. When the lifting screw rod 7 is rotated, it will drive the L-shaped connecting piece 11 to move axially up and down along the mounting bracket 5 (a part of the L-shaped connecting piece 11 is in the receiving hole 15, a part is in the installation groove 14, and a part is in the mounting bracket 5), which is convenient for adjusting the position of the fixing bracket 9 and the transducer 12 thereon.

[0029] Embodiment 3 Based on the above embodiments, as Figure 6-8As shown in the figure, the fixing bracket 9 includes a fixing substrate 91, and the back surface of the fixing substrate 91 is fixedly connected to the L-shaped connecting member 11. On both sides of the front surface of the fixing substrate 91, connecting plates 96 are provided, and the distance between the two connecting plates 96 is adapted to the width of the transducer 12. On the opposite side (i.e., the inner side, the side close to the other connecting plate 96) of the other end of each connecting plate 96, a back plate 95 is provided, and a U-shaped area for clamping the transducer 12 is formed at both ends of the fixing substrate 91, which is composed of the fixing substrate 91, the connecting plate 96 and the back plate 95.

[0030] In the middle position of the inner bottom of each connecting plate 96, a support plate 97 is provided. The width of the support plate 97 is smaller than the distance between the fixing substrate 91 and the back plate 95, so that a clamping area 92 for placing the side 124 of the transducer 12 is formed between the support plate 97 and the fixing substrate 91.

[0031] Preferably, on the front surface of the fixing substrate 91, a moving chute 98 is also inwardly opened. The connecting end of the connecting plate 96 is provided with a convex seat protruding outward. The convex seat of the connecting plate 96 extends into the moving chute 98 and can move along the length direction of the moving chute 98 in the moving chute 98. A clamping screw rod 94 is sleeved inside the fixing substrate 91, and the clamping screw rod 94 is arranged along the length direction of the fixing substrate 91. The thread directions at both ends of the clamping screw rod 94 are opposite, and the two ends of the clamping screw rod 94 are respectively threadedly connected to the convex seats of the two side connecting plates 96. By rotating the clamping screw rod 94, the two side connecting plates 96 can be driven to move towards or away from each other. For the drive of the clamping screw rod 94, a clamping handle 93 can be provided at the end of the clamping screw rod 94, and the clamping screw rod 94 can be driven to rotate coaxially by rotating the clamping handle 93; or a servo motor and a transmission mechanism (such as a gear set) can be provided in a matching manner, and the clamping screw rod 94 can be rotated by accurately controlling the rotation angle of the servo motor, so that the connecting plate 96 moves to a specified position (the servo motor and the transmission mechanism can directly apply the existing technology).

[0032] Embodiment 4 A positioning method for a right heart catheterization inspection pressure transducer includes the right heart catheterization inspection pressure transducer positioning device described in any of the foregoing embodiments; when using the right heart catheterization inspection pressure transducer positioning device for transducer zero point positioning, as Figure 9 shown, the specific steps are as follows: Step 1, place the RFID reader 3 at the position of the fourth rib of the patient in the supine position; Step 2, turn on the RFID reader 3 and emit a radio frequency signal, and record the time t 1 ; The lower RFID tag 4 and the upper RFID tag 6 receive the radio frequency signal and are respectively activated. The lower RFID tag 4 and the upper RFID tag 6 emit response signals containing their own coding information; the RFID reader 3 respectively receives the response signals of the lower RFID tag 4 and the upper RFID tag 6, and records the time t2 , t 3 (The reader emits radio frequency signals, the tag receives the signals, is activated, and emits response signals containing encoded information, which are all prior arts and can be directly applied by those skilled in the art); Step 3, according to time t 1 , t 2 calculate the distance L2 between the RFID reader 3 and the lower RFID tag 4, and calculate the distance L1 between the RFID reader 3 and the upper RFID tag 6 according to time t 1 , t 3 (When calculating the distance, those skilled in the art do not need to make creative efforts, and the distance can be obtained according to the propagation speed of electromagnetic waves * the signal propagation time (i.e., half of the time difference in Step 2)); Step 4, calculate the height of the projection D point of the RFID reader 3 on the mounting bracket 5 ; The specific calculation process is as follows: In Figure 9 the shown △ABC, the distances L1, L2, and L3 are known, so according to the cosine theorem formula, we can get (because): ; In the right triangle △BCD, ; According to the above two formulas, we can get: ; then we can obtain : ; Then according to we get : ; Among them, represents the distance between the upper RFID tag 6 and the RFID reader 3, represents the distance between the lower RFID tag 4 and the RFID reader 3, represents the distance between the lower RFID tag 4 and the upper RFID tag 6, represents the distance between the projection D point and the upper RFID tag (6); Step 5, move the fixing bracket 9 to make the height of the transducer 12 half of the height to complete the positioning of the transducer zero point.

Claims

1. A right cardiac catheter inspection pressure transducer positioning device, comprising a bed surface (1) and a mounting frame (5) disposed on the bed surface (1); characterized in that: It also includes an RFID reader (3) placed on the patient, and a lower RFID tag (4) and an upper RFID tag (6) respectively mounted on the bottom and top of a mounting frame (5); a lifting screw rod (7) is sleeved inside the mounting frame (5), and a fixing frame (9) movable along the axial direction of the mounting frame (5) is sleeved on the lifting screw rod (7); The RFID reader (3) emits a radio frequency signal, and the lower RFID tag (4) and the upper RFID tag (6) are activated after receiving the radio frequency signal and return a response signal containing their own coding information; the RFID reader (3) receives the response signals returned by the lower RFID tag (4) and the upper RFID tag (6), respectively, and calculates the distance between the lower RFID tag (4) and the RFID reader (3), and the upper RFID tag (6) and the RFID reader (3) according to the time from the emission of the radio frequency signal to the reception of the response signal, and calculates and determines the position of the fixing frame (9) according to the distance between the lower RFID tag (4) and the RFID reader (3), the upper RFID tag (6) and the RFID reader (3), and the lower RFID tag (4) and the upper RFID tag (6).

2. A right heart catheter inspection pressure transducer positioning device as claimed in claim 1, characterized in that: An internal connection hole (10) is provided in the mounting frame (5), and the lifting screw rod (7) is sleeved in the mounting frame (5) through the internal connection hole (10); An L-shaped connecting piece (11) is arranged on the back of the fixing frame (9), a threaded through hole (13) is provided at the threaded connection end of the L-shaped connecting piece (11), and the L-shaped connecting piece (11) is sleeved on the lifting screw rod (7) through the threaded through hole (13) and is threadedly connected to the lifting screw rod (7).

3. A right heart catheter inspection pressure measuring transducer positioning device as claimed in claim 2, characterized in that: A receiving hole (15) coaxial with the inner connecting hole (10) is formed in the mounting frame (5); a mounting groove (14) is formed on the mounting frame (5) along the axial direction of the mounting frame (5); the mounting groove (14) is communicated with the receiving hole (15); a threaded connection end of the L-shaped connecting piece (11) extends into the receiving hole (15) through the mounting groove (14); the lifting screw rod (7) passes through the inner connecting hole (10) and the threaded through hole (13) and is threadedly connected to the L-shaped connecting piece (11) through the threaded through hole (13).

4. A right heart catheter inspection pressure measuring transducer positioning device as claimed in claim 1, characterized in that: The fixing frame (9) comprises a fixing base plate (91) connected to the mounting frame (5), connecting plates (96) are arranged on both sides of the fixing base plate (91), back plates (95) are arranged on opposite sides of the other ends of the two connecting plates (96), and U-shaped areas for clamping the transducer (12) are formed at both ends of the fixing base plate (91); a supporting plate (97) is arranged in the middle of the inner bottom of the two connecting plates (96), and a clamping area (92) for placing the side edge (124) of the transducer (12) is formed between the supporting plate (97) and the fixing base plate (91).

5. A right heart catheter inspection pressure transducer positioning device as claimed in claim 4, characterized in that: A movable slide groove (98) is provided in the fixed base plate (91), and the connecting end of the connecting plate (96) extends into the movable slide groove (98); a clamping screw rod (94) is sleeved in the fixed base plate (91) along the length direction of the fixed base plate (91), and the threads at both ends of the clamping screw rod (94) are rotated in opposite directions, and the two ends of the clamping screw rod (94) are respectively threadedly connected to the connecting ends of the connecting plates (96) on both sides.

6. A method for positioning a pressure measuring transducer for right heart catheter examination, characterized in that: The device comprises a right cardiac catheter inspection pressure measuring transducer positioning device according to any one of claims 1 to 5; when the right cardiac catheter inspection pressure measuring transducer positioning device is used for positioning, the specific steps are as follows: Step 1, placing the RFID reader (3) at the fourth rib position of the patient in a supine position; Step 2, turning on the RFID reader (3) and emitting a radio frequency signal, and recording the time t1; the lower RFID tag (4) and the upper RFID tag (6) receive the radio frequency signal and are activated, and the lower RFID tag (4) and the upper RFID tag (6) emit a response signal containing their own coding information; the RFID reader (3) receives the response signals of the lower RFID tag (4) and the upper RFID tag (6), respectively, and records the time t2 and t3; Step 3, calculating the distance L2 between the RFID reader (3) and the lower RFID tag (4) according to the time t1 and t2, and calculating the distance L1 between the RFID reader (3) and the upper RFID tag (6) according to the time t1 and t3; Step 4: Calculate the height of the projection point D of the RFID reader (3) on the mounting frame (5) : ； ； in, represents the distance between the lower RFID tag (4) and the upper RFID tag (6), represents the distance between the projection point D and the upper RFID tag (6); Step 5, move the fixing frame (9) so that the height of the transducer (12) is half.

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