Invasive blood pressure sensing adapter and invasive blood pressure monitoring system

Abstract

The utility model provides an invasive blood pressure sensing adapter and an invasive blood pressure monitoring system. The invasive blood pressure sensing adapter comprises a boosting module, an optocoupler, a matched resistor, a sensor access end, a power supply end and a signal monitoring end, the power supply end is used for obtaining power input from the monitor; the input end of the boosting module is connected with the power supply end, the output end of the boosting module is connected with the positive electrode of the transmitting end of the optocoupler, and the negative electrode of the transmitting end of the optocoupler is connected with the sensor access end; the matched resistor is connected to the signal monitoring end through the receiving end of the optocoupler; when the sensor access end is used for accessing a sensor, the negative electrode of the transmitting end of the optocoupler is grounded through the sensor, and the optocoupler is conducted, so that the matched resistor is accessed to the signal monitoring end; and when the sensor is not accessed to the sensor access end, the optocoupler is turned off, so that the matched resistor is disconnected from the signal monitoring end.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to an invasive blood pressure sensor adapter and an invasive blood pressure monitoring system. Background Technology

[0002] Invasive blood pressure (IBP) monitoring is a technique that directly measures intravascular blood pressure through puncture and catheter placement. It is suitable for high-precision, continuous blood pressure monitoring scenarios. Its monitoring of arterial pressure is a continuous, dynamic process, unaffected by manual inflation, cuff width, or tightness, ensuring accuracy and reliability.

[0003] The core components of an invasive blood pressure monitoring system generally include a sensor, an adapter, and a monitor. The sensor (transducer) connects to a catheter inserted into the patient's blood vessel to monitor the pressure waveform and blood pressure values ​​within the vessel in real time. The sensor connects to the monitor via an adapter, thus enabling blood pressure monitoring.

[0004] In existing technologies, sensors typically include a resistive bridge and a pressure-sensitive element, which convert intravascular pressure signals into electrical signals for output. However, research has found that existing monitors using resistive bridge sensors are prone to overestimating blood pressure readings when measuring invasive blood pressure. Furthermore, hardware or software improvements to the monitors would be extremely costly and incompatible with widely used monitors. Utility Model Content

[0005] The purpose of this invention is to provide an invasive blood pressure sensor adapter and an invasive blood pressure monitoring system to solve the problem of excessively high readings in existing resistance bridge invasive blood pressure monitors.

[0006] To address the aforementioned technical problems, this utility model provides an invasive blood pressure sensor adapter, comprising: a boost module, an optocoupler, a matching resistor, a sensor access terminal, a power supply terminal, and a signal monitoring terminal; the power supply terminal is used to obtain power input from the monitor.

[0007] The input terminal of the boost module is connected to the power supply terminal, the output terminal of the boost module is connected to the positive terminal of the transmitter of the optocoupler, and the negative terminal of the transmitter of the optocoupler is connected to the sensor access terminal; the matching resistor is connected to the signal monitoring terminal through the receiver of the optocoupler.

[0008] When the sensor access terminal is used to connect the sensor, the negative terminal of the transmitter of the optocoupler is grounded through the sensor, and the optocoupler is turned on so that the matching resistor is connected to the signal monitoring terminal;

[0009] When no sensor is connected to the sensor access terminal, the optocoupler is turned off, thereby disconnecting the matching resistor from the signal monitoring terminal.

[0010] Optionally, when the sensor access terminal is used to connect a sensor, the negative terminal of the transmitter of the optocoupler is connected to the input terminal of the sensor and used to supply power to the sensor.

[0011] Optionally, the invasive blood pressure sensor adapter further includes a first sampling resistor and a second sampling resistor connected in series. The negative terminal of the transmitter of the optocoupler is grounded through the first sampling resistor and the second sampling resistor. The connection point of the first sampling resistor and the second sampling resistor is connected to the feedback terminal of the boost module.

[0012] Optionally, the sum of the resistance values ​​of the first sampling resistor and the second sampling resistor is greater than the conduction resistance required by the optocoupler.

[0013] Optionally, the resistance values ​​of the first sampling resistor and the second sampling resistor are configured such that, when the sensor is connected at the sensor access terminal, the voltage at the input terminal of the sensor matches the voltage at the power supply terminal.

[0014] Optionally, one end of the matching resistor is connected to the positive terminal of the signal monitoring terminal, and the other end is connected to the collector of the receiving terminal of the optocoupler; the emitter of the receiving terminal of the optocoupler is connected to the negative terminal of the signal monitoring terminal.

[0015] Optionally, the boost module includes an LTC1682; the optocoupler includes a PC817A; the power supply voltage is 2.5V; and the matching resistor has a resistance of 1250Ω~1300Ω.

[0016] Optionally, when the invasive blood pressure sensor adapter is used to connect to the monitor, the signal monitoring terminal is connected to the signal input terminal of the monitor.

[0017] Optionally, the matching resistor is configured to be replaceable.

[0018] To address the aforementioned technical problems, this utility model also provides an invasive blood pressure monitoring system, which includes the invasive blood pressure sensor adapter as described above, as well as a monitor and a sensor; the sensor is connected to the monitor through the invasive blood pressure sensor adapter.

[0019] In summary, the invasive blood pressure sensor adapter and invasive blood pressure monitoring system provided by this utility model include: a boost module, an optocoupler, a matching resistor, a sensor access terminal, a power supply terminal, and a signal monitoring terminal; the power supply terminal is used to obtain power input from the monitor; the input terminal of the boost module is connected to the power supply terminal, the output terminal of the boost module is connected to the positive terminal of the transmitter of the optocoupler, and the negative terminal of the transmitter of the optocoupler is connected to the sensor access terminal; the matching resistor is connected to the signal monitoring terminal through the receiver of the optocoupler; when the sensor access terminal is used to connect a sensor, the negative terminal of the transmitter of the optocoupler is grounded through the sensor, the optocoupler is turned on, so that the matching resistor is connected to the signal monitoring terminal; when the sensor access terminal is not connected to a sensor, the optocoupler is turned off, so that the matching resistor is disconnected from the signal monitoring terminal.

[0020] This configuration utilizes an optocoupler as a switching switch. When the sensor is not connected, the matching resistor is disconnected from the signal monitoring terminal. When the invasive blood pressure sensor adapter is connected to the monitor but the sensor is not connected, the optocoupler is not conducting, and the matching resistor is not connected to the circuit, thus preventing the monitor from triggering an alarm due to detecting an additional matching resistor. When the sensor is connected, the matching resistor can be connected to the signal monitoring terminal through the optocoupler, thereby compensating for the sensor's resistance bridge and effectively improving the accuracy of the monitor readings. Attached Figure Description

[0021] Those skilled in the art will understand that the accompanying drawings are provided to better understand the present invention and do not constitute any limitation on the scope of the present invention.

[0022] Figure 1 This is a schematic diagram of an invasive blood pressure monitoring system according to an embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram of the invasive blood pressure sensor adapter according to an embodiment of the present invention.

[0024] Figure 3 This is a circuit diagram of an invasive blood pressure sensor adapter according to an embodiment of the present invention, wherein the sensor is not connected.

[0025] Figure 4 This is a circuit diagram of an invasive blood pressure sensor adapter according to an embodiment of the present invention, wherein the sensor is connected.

[0026] Figure 5 This is a comparison chart of blood pressure monitoring results with and without the matching resistor set according to an embodiment of this utility model.

[0027] In the attached diagram: 1-Patient monitor; 2-Invasive blood pressure sensor adapter; 21-Boost module; 22-Optical coupler; 23-Matching resistor; 24-Sensor access terminal; 25-Power supply terminal; 26-Signal monitoring terminal; 27-First sampling resistor; 28-Second sampling resistor; 3-Sensor; 4-Detection catheter. Detailed Implementation

[0028] To make the objectives, advantages, and features of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the drawings are all in a very simplified form and are not drawn to scale, and are only used to facilitate and clarify the explanation of the objectives of the embodiments of this utility model. Furthermore, the structures shown in the drawings are often part of the actual structure. In particular, different drawings may emphasize different aspects and sometimes use different scales.

[0029] As used in this invention, the singular forms “a,” “an,” “one,” and “the” include plural objects; the term “or” is generally used to mean “and / or”; the term “a number” is generally used to mean “at least one”; and the term “at least two” is generally used to mean “two or more”. Furthermore, the terms “first,” “second,” and “third” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as “first,” “second,” or “third” may explicitly or implicitly include one or at least two of that feature; “one end” and “the other end,” and “proximal end” and “distal end” generally refer to two corresponding parts, which include not only endpoints. Furthermore, the terms "installed," "connected," and "attached," as used in this utility model, and the term "set" on one element from another, should be interpreted broadly. They generally only indicate a connection, coupling, cooperation, or transmission relationship between the two elements, which can be direct or indirect through an intermediate element. They should not be construed as indicating or implying a spatial positional relationship between the two elements, meaning one element can be located inside, outside, above, below, or to one side of the other element, unless otherwise explicitly stated. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances. Additionally, directional terms such as above, below, up, down, upward, downward, left, and right are used relative to exemplary embodiments as shown in the figures, with upward or up direction pointing towards the top of the corresponding figure, and downward or down direction pointing towards the bottom of the corresponding figure.

[0030] The purpose of this invention is to provide an invasive blood pressure sensor adapter and an invasive blood pressure monitoring system to solve the problem of excessively high readings in existing resistance bridge invasive blood pressure monitors. The following description refers to the accompanying drawings.

[0031] Please refer to Figure 1 This paper illustrates an invasive blood pressure monitoring system, which mainly includes a monitor 1, an invasive blood pressure sensor adapter 2, and a sensor 3. The sensor 3 is connected to the monitor 1 via the invasive blood pressure sensor adapter 2. In application, the blood pressure sensor adapter 2 is connected to the monitor 1. Then, through puncture and catheterization, a detection catheter 4 is inserted into a predetermined position in a blood vessel. The detection catheter 4 is connected to the sensor 3, the valve on the sensor 3 is configured, and the relative position of the sensor 3 is adjusted (e.g., at the level of the fourth intercostal space along the mid-axillary line). Finally, the sensor 3 is connected to the blood pressure sensor adapter 2. Detailed technical details can be found in existing technologies. As described in the background art, the sensor 3 generally contains a resistance bridge, which has the problem of overestimating readings in application.

[0032] The inventors discovered that matching a specific resistor to the resistor bridge of sensor 3 can achieve a calibration effect, making the final reading of monitor 1 closer to the actual value. However, sensor 3 is generally a single-use product. If resistor matching is required at sensor 3, it would increase the cost of sensor 3 as a consumable. Furthermore, as a standardized product manufactured in large quantities, additional resistor matching for sensor 3 could easily lead to product compatibility issues. Hardware or software matching at monitor 1 is difficult and costly, and difficult to implement on existing, widely used monitors. Therefore, a suitable improvement is to the blood pressure sensor adapter 2. Setting a matching resistor on the blood pressure sensor adapter 2 would not affect the production and application of existing monitors 1 and sensor 3, and the improvement cost would be relatively low.

[0033] However, further research by the inventors revealed that existing blood pressure monitors 1 generally have a signal monitoring alarm function, which triggers an alarm when the voltage difference at their signal input terminals exceeds a certain value. This is because existing monitors typically detect the voltage difference between their signal input terminals (such as BP+ and BP- in this embodiment) and then map this voltage difference to obtain the human blood pressure value. If the detected voltage difference is too large, the mapped blood pressure value will significantly exceed a reasonable range, triggering an alarm. For example, some monitors 1 will trigger an alarm when the difference between the two signal ports at their signal input terminals is ≥30mV. If a matching resistor is directly set in the blood pressure sensor adapter 2, when the blood pressure sensor adapter 2 is inserted into the monitor 1, the resistance value of the matching resistor is usually very large, which will cause a voltage difference of more than 30mV between the two signal ports BP+ and BP- at the signal input terminals of the monitor 1, causing the monitor 1 to alarm.

[0034] To set a matching resistor in the blood pressure sensor adapter 2 while avoiding triggering an alarm on monitor 1, please refer to... Figures 2 to 4 This utility model provides a blood pressure sensor adapter 2, which includes: a boost module 21, an optocoupler 22, a matching resistor 23, a sensor access terminal 24, a power supply terminal 25, and a signal monitoring terminal 26. The power supply terminal 25 is used to obtain power input from a monitor 1. The input terminal of the boost module 21 is connected to the power supply terminal 25, the output terminal of the boost module 21 is connected to the positive terminal of the transmitter of the optocoupler 22, and the negative terminal of the transmitter of the optocoupler 22 is connected to the sensor access terminal 24. The matching resistor 23 is connected to the signal monitoring terminal 26 through the receiver of the optocoupler 22. When the sensor access terminal 24 is used to connect a sensor 3, the negative terminal of the transmitter of the optocoupler 22 is grounded through the sensor 3, and the optocoupler 22 is turned on so that the matching resistor 23 is connected to the signal monitoring terminal 26. When the sensor access terminal 24 is not connected to a sensor 3, the optocoupler 22 is turned off so that the matching resistor 23 is disconnected from the signal monitoring terminal 26. Optionally, when the invasive blood pressure sensor adapter 2 is used to connect to the monitor 1, the signal monitoring terminal 26 is connected to the signal input terminal of the monitor 1.

[0035] This configuration effectively uses optocoupler 22 as a switch. When sensor 3 is not connected, the matching resistor 23 is disconnected from the signal monitoring terminal 26. This prevents the monitor 1 from triggering an alarm due to detecting the additional matching resistor 23 when the invasive blood pressure sensor adapter 2 is connected to the monitor 1 but sensor 3 is not connected. When sensor 3 is connected, the matching resistor 23 can be connected to the signal monitoring terminal 26 via optocoupler 22, thereby compensating for the resistance bridge of sensor 3 and effectively improving the accuracy of the monitor 1's readings. Understandably, the voltage difference between the two signal input ports BP+ and BP- is within the reasonable range set by the monitor, thus preventing an alarm.

[0036] In an alternative example, the boost module 21 includes an LTC1682 ( Figure 3 and Figure 4 U1 in the middle); the optocoupler 22 includes PC817A ( Figure 3 and Figure 4(U2 in the example). The LTC1682 is a boost converter chip, whose Vin pin is configured as the input terminal of the boost module 21, and whose Vout pin is configured as the output terminal of the boost module 21. It should be noted that the LTC1682 is only an example of a boost converter chip and not a limitation thereof, and the PC817A is an example of an optocoupler 22 and not a limitation thereof. Those skilled in the art can select other similar components of different models according to the functions of the boost converter chip and the optocoupler 22, and this embodiment does not limit them in this regard.

[0037] Optionally, when the sensor access terminal 24 is used to connect the sensor 3, the negative terminal of the transmitter of the optocoupler 22 is connected to the input terminal of the sensor 3. Figure 3 and Figure 4 The R10 connector is used to power the sensor 3. The sensor 3 and the invasive blood pressure sensor adapter 2 generally do not have their own power supply; their power is typically supplied by the monitor 1. In one example, the monitor 1 provides a power supply voltage of 2.5V, meaning the voltage V+in at the power supply terminal 25 is 2.5V. The rated power supply voltage of the sensor 3 matches the power supply voltage provided by the monitor 1, which is also 2.5V.

[0038] In this embodiment, optocoupler 22 is used as a switching switch. Optocoupler 22 is a current-driven component, which generally includes an emitter (light-emitting diode) and a receiver (phototransistor). When sufficient forward current flows through the emitter, the light-emitting diode emits light, and the receiver can be considered to be conducting. When the current at the emitter does not meet the rated requirements, the receiver is effectively disconnected. It is understood that the emitter of optocoupler 22 itself has a certain voltage drop (the operating voltage drop of the light-emitting diode) during operation, which is generally 1V~1.5V. Therefore, after passing through optocoupler 22, the power supply (2.5V) to sensor 3 must be guaranteed. Thus, the positive potential of the emitter of optocoupler 22 needs to be higher than the voltage at the power supply terminal 25, for example, above 3.5V, to ensure that the voltage after the voltage drop at the emitter of optocoupler 22 matches the requirements of sensor 3. For this purpose, this embodiment includes a boost module 21, which increases the voltage V+in (2.5V) at the power supply terminal 25 to meet the requirements of optocoupler 22 and sensor 3.

[0039] Optionally, the invasive blood pressure sensor adapter 2 further includes a first sampling resistor 27 connected in series. Figure 3 and Figure 4 R5 in the middle) and the second sampling resistor 28 ( Figure 3 and Figure 4In the example R6), the negative terminal of the transmitter of the optocoupler 22 is grounded through the first sampling resistor 27 and the second sampling resistor 28. The connection point of the first sampling resistor 27 and the second sampling resistor 28 is connected to the feedback terminal of the boost module 21. The first sampling resistor 27 and the second sampling resistor 28 constitute the feedback voltage divider resistor network of the boost module 21. Some boost modules 21 can adjust the voltage at their output terminal by the voltage at the feedback terminal. For example, in... Figure 3 and Figure 4 In the illustrated example, the boost module 21 includes a boost chip LTC1682, whose FB pin can be configured as the feedback terminal of the boost module 21. By adjusting the resistance values ​​of the first sampling resistor 27 and the second sampling resistor 28, the voltage at the feedback terminal can be adjusted, thereby adjusting the voltage at the output terminal of the boost module 21.

[0040] Furthermore, the sum of the resistance values ​​of the first sampling resistor 27 and the second sampling resistor 28 is greater than the conduction requirement resistance of the optocoupler 22. The conduction requirement resistance of the optocoupler 22 is explained here. The optocoupler 22 is a current-driven component, and its conduction requires a certain forward current to flow through the transmitting end. According to Ohm's law, current = voltage / resistance. The output voltage of the boost module 21 is known. If the circuit of the first sampling resistor 27, the second sampling resistor 28, and the optocoupler 22 satisfies the conduction requirement, its resistance can also be calculated. Subtracting the conduction resistance of the optocoupler 22 itself gives the conduction requirement resistance of the optocoupler 22. If the sum of the resistance values ​​of the first sampling resistor 27 and the second sampling resistor 28 is greater than this conduction requirement resistance, the optocoupler 22 cannot meet the conduction condition and remains off. Since the matching resistor 23 needs to be shielded before the sensor 3 is connected, the sum of the resistance values ​​of the first sampling resistor 27 and the second sampling resistor 28 should be configured to be relatively large so that the optocoupler 22 can reliably be in the off state before the sensor 3 is connected. Figure 3 and Figure 4 In the example shown, the resistance of the first sampling resistor 27 is 51.2 KΩ, and the resistance of the second sampling resistor 28 is 49.9 KΩ. It is understood, of course, that these resistance values ​​are for illustrative purposes only and not as limiting.

[0041] Optionally, the resistance values ​​of the first sampling resistor 27 and the second sampling resistor 28 are configured such that when the sensor access terminal 24 is used to connect the sensor 3, the voltage at the input terminal of the sensor 3 matches the voltage at the power supply terminal 25 (e.g., both are 2.5V). To ensure that the voltage at the sensor access terminal 24 matches the requirements of the sensor 3 (e.g., 2.5V), the voltage at the sensor access terminal 24 when the sensor 3 is connected can be adjusted by adjusting the resistance values ​​of the first sampling resistor 27 and the second sampling resistor 28. In one example, the initial value of the resistance of each arm of the resistor bridge of the sensor 3 is 1.2KΩ, which is equivalent to being connected in parallel with the first sampling resistor 27 and the second sampling resistor 28 when connected to the sensor access terminal 24. In addition, the matching resistor 23 connected is equivalent to being connected in parallel with the resistor bridge of the sensor 3, which has a certain influence on the equivalent resistance of the sensor 3. Taking into account these factors, as well as the rated required voltage of the sensor 3 (which should match the voltage of the power supply terminal 25, such as 2.5V), a suitable resistance value for the first sampling resistor 27 and the second sampling resistor 28 can be obtained.

[0042] Optionally, one end of the matching resistor 23 is connected to the positive terminal (BP+) of the signal monitoring terminal 26, and the other end is connected to the collector of the receiving terminal of the optocoupler 22; the emitter of the receiving terminal of the optocoupler 22 is connected to the negative terminal (BP-) of the signal monitoring terminal 26. In an exemplary example, for a sensor 3 with an initial resistance value of 1.2KΩ for each bridge arm, the resistance value of the matching resistor 23 is preferably 1250Ω~1300Ω. Optionally, the matching resistor 23 can be configured as two resistors connected in series, such as... Figure 3 and Figure 4 The example shown uses resistors R7 and R8. Resistor R7 has a resistance of 1.2 kΩ, and resistor R8 has a resistance of 50 Ω. Preferably, the matching resistor 23 is configured to be replaceable to adapt to different monitors 1. It should be noted that the replacement of the matching resistor 23 can mean that one or both of the matching resistors 23 are replaceable; this embodiment is not limited to this.

[0043] The invasive blood pressure monitoring system provided in this embodiment includes the invasive blood pressure sensor adapter 2 as described above, and the sensor 3 is connected to the monitor 1 through the invasive blood pressure sensor adapter 2. For the structure and principle of other components of the invasive blood pressure monitoring system, please refer to the prior art; this embodiment will not elaborate on them.

[0044] Please refer to Figure 5The diagram shows a comparison of actual blood pressure (real blood pressure, first column from the left), blood pressure monitored by the invasive blood pressure monitoring system with matching resistor 23 provided in this embodiment (second column from the left), and blood pressure monitored by a control example without matching resistor 23 (third column from the left). It is evident that the blood pressure monitored by the invasive blood pressure monitoring system provided in this embodiment is closer to the actual blood pressure, effectively improving the output linearity of the disposable sensor 3.

[0045] In summary, the invasive blood pressure sensor adapter and invasive blood pressure monitoring system provided by this utility model include: a boost module, an optocoupler, a matching resistor, a sensor access terminal, a power supply terminal, and a signal monitoring terminal; the power supply terminal is used to obtain power input from the monitor; the input terminal of the boost module is connected to the power supply terminal, the output terminal of the boost module is connected to the positive terminal of the transmitter of the optocoupler, and the negative terminal of the transmitter of the optocoupler is connected to the sensor access terminal; the matching resistor is connected to the signal monitoring terminal through the receiver of the optocoupler; when the sensor access terminal is used to connect a sensor, the negative terminal of the transmitter of the optocoupler is grounded through the sensor, the optocoupler is turned on, so that the matching resistor is connected to the signal monitoring terminal; when the sensor access terminal is not connected to a sensor, the optocoupler is turned off, so that the matching resistor is disconnected from the signal monitoring terminal. This configuration, using an optocoupler as a switching switch, disconnects the matching resistor from the signal monitoring terminal when the sensor is not connected. This prevents the monitor from triggering an alarm due to detecting an additional matching resistor when the invasive blood pressure sensor adapter is connected to the monitor but the sensor is not connected. When the sensor is connected, the matching resistor can be connected to the signal monitoring terminal via the optocoupler, thereby compensating for the sensor's resistance bridge and effectively improving the accuracy of the monitor readings.

[0046] It should be noted that the above embodiments can be combined with each other. The above description is only a description of preferred embodiments of the present utility model and is not intended to limit the scope of the present utility model in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the present utility model.

Claims

1. An invasive blood pressure sensor adapter, characterized in that, include: Boost module, optocoupler, matching resistor, sensor access terminal, power supply terminal, and signal monitoring terminal; The power supply terminal is used to obtain power input from the monitor; The input terminal of the boost module is connected to the power supply terminal, the output terminal of the boost module is connected to the positive terminal of the transmitter of the optocoupler, and the negative terminal of the transmitter of the optocoupler is connected to the sensor access terminal; the matching resistor is connected to the signal monitoring terminal through the receiver of the optocoupler. When the sensor access terminal is used to connect the sensor, the negative terminal of the transmitter of the optocoupler is grounded through the sensor, and the optocoupler is turned on so that the matching resistor is connected to the signal monitoring terminal; When no sensor is connected to the sensor access terminal, the optocoupler is turned off, thereby disconnecting the matching resistor from the signal monitoring terminal.

2. The invasive blood pressure sensor adapter according to claim 1, characterized in that, When the sensor access terminal is used to connect a sensor, the negative terminal of the transmitter of the optocoupler is connected to the input terminal of the sensor and is used to supply power to the sensor.

3. The invasive blood pressure sensor adapter according to claim 1, characterized in that, The invasive blood pressure sensor adapter also includes a first sampling resistor and a second sampling resistor connected in series. The negative terminal of the transmitter of the optocoupler is grounded through the first sampling resistor and the second sampling resistor. The connection point of the first sampling resistor and the second sampling resistor is connected to the feedback terminal of the boost module.

4. The invasive blood pressure sensor adapter according to claim 3, characterized in that, The sum of the resistance values ​​of the first sampling resistor and the second sampling resistor is greater than the conduction resistance required by the optocoupler.

5. The invasive blood pressure sensor adapter according to claim 3, characterized in that, The resistance values ​​of the first sampling resistor and the second sampling resistor are configured such that, when the sensor is connected at the sensor access terminal, the voltage at the input terminal of the sensor matches the voltage at the power supply terminal.

6. The invasive blood pressure sensor adapter according to claim 1, characterized in that, One end of the matching resistor is connected to the positive terminal of the signal monitoring terminal, and the other end is connected to the collector of the receiving terminal of the optocoupler; the emitter of the receiving terminal of the optocoupler is connected to the negative terminal of the signal monitoring terminal.

7. The invasive blood pressure sensor adapter according to claim 1, characterized in that, The boost module includes an LTC1682; the optocoupler includes a PC817A; the power supply voltage is 2.5V; and the matching resistor has a resistance of 1250Ω~1300Ω.

8. The invasive blood pressure sensor adapter according to claim 1, characterized in that, When the invasive blood pressure sensor adapter is used to connect to the monitor, the signal monitoring terminal is connected to the signal input terminal of the monitor.

9. The invasive blood pressure sensor adapter according to claim 1, characterized in that, The matching resistor is configured to be replaceable.

10. An invasive blood pressure monitoring system, characterized in that, The device includes an invasive blood pressure sensor adapter according to any one of claims 1 to 9, and further includes a monitor and a sensor; the sensor is connected to the monitor via the invasive blood pressure sensor adapter.

Images