JP2017205534A - Eavesdropping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an eavesdropping device for monitoring measured physiological variables of a patient.SOLUTION: The eavesdropping device comprises: a first sensor arranged to be disposed in or outside the body of a patient for measuring aortic blood pressure; a second sensor arranged for measuring distal blood pressure; a central monitoring device for monitoring the measured physiological variables; and a communication link for communicating signals representing the measured physiological variables from sensors to the central monitoring device. The eavesdropping device is configured such that a communication interface is arranged at the communication link to communicate at least the signal representing the aortic blood pressure to a monitor of the eavesdropping device. The receiver of the eavesdropping device is connected to the communication link, in parallel with the central monitoring device. The signal representing the aortic blood pressure is communicated to the receiver via a high-impedance connection at the communication interface. The receiver is arranged to receive the signal representing the measured distal blood pressure from the communication link. By means of the blood pressure signals of the respective sensor, FFR can be calculated.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an intercept device including a receiver for acquiring physiological variables measured in the body and a high impedance interface.

  Today, there is an increasing need for invasive measurements of physiological variables. For example, when examining a cardiovascular disease, it is strongly required to obtain local measurement values of blood pressure and blood flow as means for evaluating the state of the measurement subject under measurement. Accordingly, methods and devices have been developed for placing a small sensor in a patient's body at the site where the measurement is to be performed and communicating with the small sensor. In general, a miniature sensor is placed at the end of a guide wire that is well known in the art and used, for example, in connection with the treatment of coronary artery disease.

The distal end of the guide wire is inserted into the patient's body, for example, into the femoral artery opening and placed at the desired site. Once the doctor places the guidewire in the appropriate site, the miniature sensor can measure blood pressure and / or blood flow. Blood pressure measurement is one method for diagnosing the severity of stenosis. In addition, an appropriate type of catheter can be guided with a guide wire. Next, balloon expansion can be performed. When measuring peripheral blood pressure (P _d ), the sensor needs to be inserted into the peripheral blood vessel of the stenosis. For obvious reasons, the size of the sensor and guidewire is quite small, and the guidewire diameter is usually 0.35 mm.

  When diagnosing the severity of stenosis at a hospital or clinic, a catheter with a first sensor is inserted proximal to the patient's potential stenosis (usually visualized by fluoroscopy) . Connect the sensor to the central monitoring device via electrical leads. A central monitoring device used to monitor a patient's life support status, including blood pressure measured through a first sensor, is called a catlaboratory monitor. In the case of stenosis, blood vessels are narrower than normal, and blood flow is blocked at the stenosis. When vascular narrowing is seen in the angiogram, it is recommended to measure the coronary flow reserve ratio (FFR) to determine the extent of blood pressure difference between the proximal and distal stenosis Yes.

FFR is approximated by P _d / P _a . FFR is a measure of the pressure at the distal portion of the stenosis relative to the pressure at the proximal portion of the stenosis. Thus, FFR represents the vascular blood flow in a place where stenosis is present compared with the vascular blood flow in a place where it is assumed that there is no stenosis. Other physiological parameters can be further measured and transmitted to the catlaboratory monitor. If FFR measurements show that there is a large pressure drop in the blood vessel, treatment of the patient is necessary, for example, by means of expanding the blood vessel with a balloon or stent or by coronary artery bypass surgery.

In the prior art, the aortic blood pressure sensor is separated from the patient and the catlaboratory monitor to measure peripheral blood pressure. At this time, the second sensor is used to measure _Pd (described above). This second sensor is inserted in the distal part of the patient where stenosis is possible. The second sensor and the first sensor are connected to a small and easy to use monitoring device with additional functionality. Therefore, as can be seen from FIG. 3, the pressure signal is connected to a small monitoring device 304 and then relayed to the catlabor monitor 305.

  This method has drawbacks. For example, when a small monitoring device is connected to an operating system, the connector that transmits the pressure signal to the categorical monitor may be disconnected, and the connector may be reconnected to the categorical monitor via a small monitoring device. I need it. Furthermore, in addition to the apparent redundancy of the manual disconnecting operation, disconnecting the pressure signal connector means recalibrating the monitor, and this procedure is undesirable.

  The object of the present invention is to solve or at least mitigate the above-mentioned problems in the prior art.

  According to the invention, the above object is achieved by the invention with the features described in claim 1. Preferred embodiments are described in the dependent claims.

  To achieve this object, an intercept device is provided for obtaining measured patient physiological variables. The intercepting device includes a receiver and a communication interface.

Eavesdropping device is usually a second sensor configured to measure a first sensor configured to be disposed within a patient, the blood pressure P _d of the peripheral in order to measure the blood pressure P _a of the aorta And is used in systems including The system further includes a central monitoring device for monitoring the measured physiological variable, and a communication for transmitting a signal indicating the measured physiological variable from the sensor to the central monitoring device between the sensor and the central monitoring device. Including links.

The intercepting device is configured to place a communication interface on the communication link to communicate at least a signal indicative of aortic blood pressure to a receiver of the intercepting device. Furthermore, the receiver of the intercept device is configured to connect to the communication link in parallel with the central monitoring device and to include at least one high impedance input. Signal indicating the blood pressure P _a of the aorta is transmitted to the input of a high impedance via the communication interface. Receiver of eavesdropping device is further configured to receive a signal indicative of the blood pressure P _d of the measured peripheral from the communication link. The FFR can be calculated using the blood pressure signal from each sensor.

  The invention is advantageous in that a central monitoring device, for example a so-called catlaboratory monitor, can be connected directly to the sensor using suitable connection means. After being connected, the sensor and the central monitoring device are balanced. That is, the aortic blood pressure and the peripheral blood pressure are each zero adjusted so that an accurate pressure reference level is introduced into the measurement system. Once balanced, for example, an eavesdropping device such as Radi Analyzer (registered trademark) can be connected in parallel with the central monitoring device via a high impedance interface formed by the receiver of the eavesdropping device and the communication interface. You can connect the sensor to a communication link that connects to a central monitoring device. That is, the intercept receiver can “intercept” on the communication link and thus can access and monitor the measured aortic blood pressure without significantly affecting the pressure signal. In the prior art, as soon as the second monitoring device is connected between the sensor and the central monitoring device, the connector transmitting the pressure signal to the central monitoring device must be disconnected and connected to the second monitoring device. Don't be. The pressure signal is then transmitted from the second monitoring device to the central monitoring device. This prior art procedure requires further balancing steps. First, the sensor and the second monitoring device are balanced, and then the second monitoring device and the central monitoring device are balanced.

  In an embodiment, the communication link is arranged to transmit a signal indicative of the measured aortic pressure to the central monitoring device via a wired connection and to the intercept receiver via a wireless connection formed by the communication interface. To do. A signal indicating the measured peripheral blood pressure is transmitted to the central monitoring device using a wired or wireless channel and to the intercept receiver using a wireless channel, but a wired channel can of course be used. Obviously, many combinations are possible. It can also be envisaged to transmit one or both of the measured blood pressure signals to the intercept receiver using a wired connection.

  The peripheral blood pressure signal is preferably transmitted to the intercept receiver using a wireless channel. On the other hand, transmitting the aortic blood pressure signal to the intercept receiver via a wired connection is still advantageous over the prior art, but to avoid further cable placement, transmit to the intercept receiver via a wireless channel. It is desirable to do.

  However, in any particular combination, the intercept receiver is connected in parallel to the central monitoring device via the high impedance communication interface of the intercept device. Thus, by properly using wired and / or wireless channels, the central monitoring device is connected and balanced to the two sensors. Furthermore, the intercept receiver is connected in parallel with the central monitoring device via a high impedance interface without affecting the transmitted aortic blood pressure signal. Therefore, in these embodiments, the number of steps required including calibration and cable reconnection is reduced. Obviously, some problems in the prior art can be solved by connecting the intercept receiver in parallel with the central monitoring device via a high impedance communication interface.

  In a further embodiment, a central monitoring device supplies power to the communication interface. In a further embodiment, the communication interface comprises a power supply battery. In yet another embodiment, the battery can be charged from a central monitoring device.

  In these embodiments, the user does not need to consider the power of the communication interface and can easily connect the (wireless or wired) communication interface to the aortic sensor device and the central monitoring device using appropriate connectors. . From the user's point of view, the power supply is fully automated. As a more effective configuration, pre-installing the communication interface on the sensor cable allows the user to easily and directly connect the cable to the central monitoring device while starting the measurement procedure.

  A further advantage of connecting the intercept receiver wirelessly to the communication link in parallel with the central monitoring device is that no cable is required for the intercept receiver.

  The patent specification also describes a number of method steps or operations.

  Additional features and advantages of the invention will be apparent from a review of the appended claims and the following description. It will be apparent to those skilled in the art that various features of the present invention can be combined to create embodiments other than those described in the following.

FIG. 1 is a longitudinal sectional view of an exemplary sensor guide structure that can be used in the present invention. FIG. 2 shows a prior art sensor device for measuring physiological variables in the body. FIG. 3 is a diagram illustrating how prior art FFR measurements are performed using the sensor device described in connection with FIGS. 1 and 2. FIG. 4 is a diagram showing an embodiment of the intercept device of the present invention. FIG. 5 shows a further embodiment of the intercept device of the present invention. FIG. 6 is a diagram showing another embodiment of the intercept device of the present invention. FIG. 7 is a diagram showing still another embodiment of the intercept device of the present invention. FIG. 8 is a diagram showing a further additional embodiment of the intercept device of the present invention.

  Preferred embodiments of the present invention will be described with reference to the accompanying drawings.

  In the prior art, it is well known to attach a sensor to a guide wire and place the sensor through a guide wire in a blood vessel of a living body to detect physical parameters such as blood pressure or body temperature. The sensor includes an element that senses a parameter directly or indirectly. A number of patents have been granted to this assignee describing various types of sensors for measuring physiological parameters. For example, as described in US Pat. No. 6,615,067, temperature can be measured by observing the resistance of a conductor with a temperature sensitive resistance. Another exemplary sensor can be found in US Pat. Nos. 6,167,763 and 6,615,667, which apply pressure to the sensor due to blood flow, and the sensor indicates a signal indicative of that pressure. Put out. All instruments and methods described therein, including instruments and methods for measuring physical parameters, are incorporated herein by reference to these US patents.

  One or more signal transmission cables are used to supply power to the sensor and to transmit a signal indicative of the measured physiological variable to a control unit operating as an interface device located outside the body, Connected to the sensor. The cable is also routed along the guide wire to be drawn from the blood vessel through the connector assembly to the external control unit. The control unit can be configured to perform the functions of the signal converter described above, i.e. to convert the sensor signal into a format recognized by the ANSI / AAMI BP22-1994 standard. Moreover, the guide wire is usually provided with a central metal wire (core wire) used as a sensor support.

  FIG. 1 is a diagram illustrating an exemplary sensor attached to a guidewire, ie, a sensor guide structure 101. For illustration, the sensor guide structure is divided into five parts 102 to 106 in the figure. Portion 102 is the most distal portion, i.e., the portion that is most deeply inserted into the blood vessel. The portion 106 is a nearest portion, that is, a portion located closest to a control unit (not shown). Portion 102 includes a radiopaque coil 108 made of, for example, platinum with an arcuate tip 107. A stainless steel solid metal wire 109 is also attached to the platinum coil and its tip. The metal wire in the portion 102 forms a thin conical tip and functions as a safety wire for the platinum coil 108. In the portion 102, the metal wire 109 is gradually tapered toward the arcuate tip 107, so that the front portion of the sensor guide structure is gradually softer.

  At the transition between the portions 102 and 103, the lower end of the coil 108 is attached to the wire 109 by an adhesive, or alternatively by soldering, to form a joint 110. For example, a thin outer tube 111 made of a biocompatible material such as polyimide starts at the joint 110 and extends down to the portion 106 over its entire length. The outer tube 111 is processed so as to have a smooth outer surface with little friction with respect to the sensor guide structure. The metal wire 109 is significantly widened at the portion 103, and a slot 112 is provided in the widened portion, and a sensor element 114 such as a pressure gauge is disposed there. Electrical energy is required for the sensor to operate. The spread of the metal wire 109 to which the sensor element 114 is attached reduces the stress applied to the sensor element 114 at the blood vessel portion that is bent at an acute angle.

  A signal transmission cable 116 is provided from the sensor element 114, and the signal transmission cable 116 usually includes one or a plurality of electric cables. The signal transmission cable 116 extends from the sensor element 114 to an interface device (not shown) located below the portion 106 and outside the main body. The voltage is supplied to the sensor via the signal transmission cable 116 (or a plurality of cables). A signal indicative of the measured physiological variable is also transmitted along the signal transmission cable 116. In order to obtain good flexibility of the front part of the sensor guide structure, the metal wire 109 is substantially thinner at the beginning of the part 104. In order to facilitate pushing the sensor guide structure 101 into the blood vessel, the metal wire 109 is thicker at the end of the portion 104 and the entire portion 105. In portion 106, the metal wire 109 is roughened as much as possible to make it easier to handle, where slots 120 are provided and the cable 116 is attached, for example, with an adhesive.

  A use state of the guide wire 201 as shown in FIG. 1 is schematically shown in FIG. Guide wire 201 is inserted into the femoral artery of patient 225. The positions of the guide wire 201 and the sensor 214 in the body are indicated by dotted lines. Guide wire 201, and more particularly its electrical transmission cable 211, is also connected to cable 211 using any suitable connection means (not shown) such as an alligator clip connector or other known connector. The control unit 222 is connected via the H.226. It is desirable to make the wire 226 as short as possible to facilitate handling of the guide wire 201. It is desirable to omit the wire 226 and consequently attach the control unit 222 directly to the cable 211 via a suitable connector. The control unit 222 supplies a voltage to a circuit including the wire 226, the cable 211 of the guide wire 201, and the sensor 214. Further, a signal indicating the measured physiological variable is transmitted from the sensor 214 to the control unit 222 via the cable 211. Methods for introducing guidewire 201 are well known to those skilled in the art. A signal indicating the peripheral blood pressure measured by the sensor 214 is transmitted from the control unit 222 to one or more monitoring devices by either wireless communication or wired connection, but the ANSI / AAMI BP22. -It is desirable to use the 1994 standard.

  The voltage supplied to the sensor from the control unit can be an alternating current (AC) or direct current (DC) voltage. In general, when applying an AC voltage, it is common to connect the sensor to a circuit that includes a rectifier that converts the AC voltage to a DC voltage in order to drive the sensor selected to sense the physical parameter under investigation. It is.

FIG. 3 shows how FFR measurements are made today using the sensors described in connection with FIGS. The first sensor 308 (not placed in the patient's body) measures the aortic blood pressure Pa in _a known manner. Second sensor 309 is inserted into the patient 301 in order to measure the blood pressure P _d of the peripheral. A communication link including a channel 302 for communicating peripheral blood pressure and a channel 303 for communicating aortic blood pressure is configured between the sensor and a second monitoring device 304, eg, Radia Analyzer®. . As is well known in the art, the Radia Analyzer (registered trademark) is used to display data to a user after analyzing data received from one or both sensors. The receiving function of the present invention can be linked to or incorporated into such a unit. From the second monitoring device 304, each channel is connected to a central monitoring device 305, also called a catlaboratory monitor. One or both monitoring devices are used to calculate FFR with two pressures as P _d / P _a . Now, as mentioned above, the prior art methods have drawbacks. Connecting a second small monitoring device to the active system disconnects the connectors that carry the pressure signal to the catlabor monitor and reconnects these connectors to the catalab monitor via a small monitor. It will be necessary to connect. Further, disconnecting the pressure signal connector means recalibration of the monitoring equipment, which is an undesirable procedure. Initially, the second monitoring device 304 must be calibrated to the peripheral blood pressure channel 302. Next, the second monitoring device 304 must be calibrated to the aortic blood pressure channel 303. Finally, a balance between the second monitoring device 304 and the first monitoring device 305 must be balanced, which is to zero out both blood pressure channels 302, 303 extending between the monitoring devices. means. This makes a total of 4 calibration / balance steps.

  FIG. 4 is a diagram showing an embodiment of the present invention that alleviates the problems mentioned in the prior art. In FIG. 4, the peripheral blood pressure channel 402 transmits the signal measured by the built-in sensor 409 in the patient 401 to the control unit 406 via a wired connection. The control unit 406 can perform signal conditioning (described below) to send peripheral blood pressure signals to the intercept receiver 404 and the central monitoring device 405. In another embodiment, signal conditioning can be performed by the intercept receiver 404. (In such embodiments, the functionality of the control unit 406 is incorporated into the intercept receiver. Thus, the channel 402 is connected from the patient to the intercept receiver, and then from the intercept receiver to the central monitoring device 405. ) A suitable control unit is a connector for a sensor guide wire assembly, such as a female connector for pressure wire®, but other control units can also be used. In this manner, a signal indicating the measured peripheral blood pressure is transmitted to the intercept receiver 404 and the central monitoring device 405 using the wired peripheral blood pressure channel 402. In this particular embodiment, a signal indicating aortic blood pressure measured by an external sensor 408 is transmitted to both the intercept receiver 404 and the central monitoring device 405 via a wired channel 403. The wired communication interface 407 of the intercepting device of the present invention is arranged at an appropriate position along the channel 403 of the aorta, for example, at the input side of the central monitoring device 405. The intercepting interface 407 transmits a signal indicating the measured aortic blood pressure to the intercepting receiver 404. The interface 407 can be electrically attached to a conductor in the channel 403 via a high impedance device (eg, a resistor). Alternatively, the interface 407 can sense the electrical signal in the channel 403 by sensing the magnetic field and / or electric field near the channel 403 created by the electrical signal passing through the conductor in the channel 403. Since the intercepting interface 407 is arranged with a high impedance input, the intercepting device does not affect the signal traveling on the channel 403 of the aorta. As described above, when the intercepting device of the present embodiment is used, only three calibration / balance steps are required, so that the interception signal need not be calibrated. Further, when the categorical monitor is in operation, it is not necessary to disconnect any of the devices in order to connect the interception monitoring device (ie, usually the Radial Analyzer (registered trademark)) to the central monitoring device (categorical monitor). As can be seen from FIG. 4, the intercept receiver 404 is connected in parallel with the central monitoring device 405 to a communication link that includes the peripheral channel 402 and the aortic channel 403. This makes it very easy for medical personnel to operate.

  It is desirable that a wired communication interface 407 be pre-installed on a standard communication cable for connecting the aortic pressure sensor 408 to the central monitoring device 405. Such cables and connectors are well known in the art, but can also be designed for easy connection to such cables, for example by providing an assembly that includes a suitable connector and transmission unit It is. In the latter case, the connector of the aortic channel 403 to the central monitoring device 405 is disconnected and reconnected via the prepared assembly. Such a procedure requires reconnection of cables, but no new calibration is required.

  FIG. 5 shows a further embodiment of the invention that alleviates the problems mentioned in the prior art. In FIG. 5, the peripheral blood pressure channel 502 transmits the signal measured by the built-in sensor 509 in the patient 501 to the control unit 506 via a wired connection. In this manner, a signal indicating the measured peripheral blood pressure is transmitted to the intercept receiver 504 and the central monitoring device 505 using the wired peripheral blood pressure channel 502. In this particular embodiment, a signal indicating aortic blood pressure measured by an external sensor 508 is transmitted to the central monitoring device 505 via a wired channel 503. The radio communication interface 507 of the intercepting device of the present invention is arranged at an appropriate position along the channel 503 of the aorta, for example, at the input side of the central monitoring device 505. The wireless intercepting interface 507 transmits a signal indicating the measured aortic blood pressure to the intercepting receiver 504 capable of wireless communication. Since the intercepting interface 507 is configured with a high impedance input, the intercepting does not affect the signal traveling on the aortic channel 503. As described above, when the intercepting device of the present embodiment is used, only three calibration / balance steps are required, so that the interception signal need not be calibrated. Further, when the catlabor monitor is in operation, no disconnection is required to connect the intercept receiver (ie, generally the Radial Analyzer®) to the central monitoring device (catelabor monitor). As can be seen from FIG. 5, an intercept monitoring device 504 is connected in parallel with the central monitoring device 505 to a communication link that includes a peripheral channel 502 and an aortic channel 503. This makes it very easy for medical personnel to operate.

  FIG. 6 is a diagram showing another embodiment of the present invention that alleviates the problems mentioned in the prior art. In FIG. 6, the peripheral blood pressure channel 602 that carries the signal measured by the internal sensor 609 within the patient 601 is wireless. This channel is enabled by a control unit 606 that transmits in accordance with ANSI / AAMI BP22-1994. A suitable control unit is a control unit for Pressure Wire Aerith®, but other control units may be used. In this manner, a signal indicating the measured peripheral blood pressure is transmitted to the intercept receiver 604 and the central monitoring device 605 using the channel 602 as the wireless peripheral blood pressure. At the same time, in this particular embodiment, a signal indicating the blood pressure of the aorta measured by the external sensor 608 is transmitted to the central monitoring device 605 via the wired channel 603. As can be seen from FIG. 6, the central monitoring device is adapted for communication with the control unit 606 and can communicate wirelessly, possibly using a dongle attached to the central monitoring device input. The wireless communication interface 607 of the intercepting device of the present invention is arranged at an appropriate position along the aortic channel 603, for example, at the input side of the central monitoring device 605. The wireless intercepting interface 607 transmits a signal indicating the measured aortic blood pressure to the intercepting receiver 604 capable of wireless communication. The intercepting interface 607 is configured to include a high impedance input, so that intercepting does not affect signals traveling on the aortic channel 603. As described above, when the intercepting device of the present embodiment is used, only three calibration / balance steps are required, so that the interception signal need not be calibrated. Further, when the categorical monitor is in operation, it is not necessary to disconnect any device in order to connect the intercept receiver (ie, in general, the Radial Analyzer® to the central monitoring device (categorical monitor). As can be seen from FIG. 6, an intercept receiver 604 is connected in parallel with the central monitoring device 605 to a communication link including a peripheral channel 602 and an aortic channel 603. This makes it very easy for medical personnel to operate. Become.

  FIG. 7 shows a further embodiment of the invention that alleviates the problems mentioned in the prior art. In FIG. 7, the peripheral blood pressure channel 702 that carries the signal measured by the built-in sensor 709 in the patient 701 is wireless. This channel is enabled by a control unit 706 that transmits in accordance with ANSI / AAMI BP22-1994. Thus, a signal indicating the measured peripheral blood pressure is transmitted to the intercept receiver 704 and the central monitoring device 705 using the wireless portion of the peripheral blood pressure channel 702. At the same time, in this particular embodiment, a signal indicative of the blood pressure of the aorta measured by the external sensor 708 is transmitted to the central monitoring device 705 and the intercept receiver 704 via a wired channel 703. The wire communication interface 707 of the intercepting device of the present invention is arranged at an appropriate position along the channel 703 of the aorta, for example, at the input side of the central monitoring device 705. The intercepting interface 707 transmits a signal indicating the measured aortic blood pressure to the intercepting receiver 704. Since the intercepting interface 707 is arranged with a high impedance input, the intercepting does not affect the signals traveling on the aortic channel 703. As described above, when the intercepting device of the present embodiment is used, only three calibration / balance steps are required, so that the interception signal need not be calibrated. In addition, if the catlaboratory monitor is in operation, no disconnection is required to connect the intercept receiver to the central monitoring device. As can be seen from FIG. 7, an intercept receiver 704 is connected in parallel with the central monitoring device 705 to a communication link that includes a peripheral channel 702 and an aortic channel 703. This makes it very easy for medical personnel to operate.

  In the embodiment of the present invention shown in FIGS. 4 to 7, power from a central monitoring device can be supplied to the communication interface. Therefore, since the medical staff can connect the cable in which the communication interface is arranged to the central monitoring device, it is not necessary to consider connecting an external power source to the communication interface. Alternatively, the communication interface is arranged together with the power supply battery. Further, a communication interface may be arranged together with a rechargeable battery that can be charged by the central monitoring device.

  FIG. 8 shows a further additional embodiment of the present invention that alleviates the problems mentioned in the prior art. In FIG. 8, the peripheral blood pressure channel 802 that carries the signal measured by the built-in sensor 809 within the body of the patient 801 is wireless and enabled by a control unit 806 that transmits in accordance with ANSI / AAMI BP22-1994. The In this manner, the wireless portion of the peripheral blood pressure channel 802 is used to transmit a signal indicating the measured peripheral blood pressure to the intercept receiver 804 and the central monitoring device 805. In certain embodiments, the wireless portion of the aortic channel 803 is used to transmit a signal indicative of aortic blood pressure measured by an external sensor 808 to the intercept receiver 804 and the central monitoring device 805. The wireless communication interface 807 of the intercept device of the present invention is placed at an appropriate position along the channel 803 of the aorta. The wireless interception interface 807 transmits a signal indicating the measured blood pressure of the aorta to the interception receiver 804 that can perform wireless communication and the central monitoring device 805 that can also perform wireless communication. Each of the interception receiver and the central monitoring device can be adapted to wireless communication with the communication interface 807 using a dongle attached to each input unit. The intercept interface 807 is provided with a high impedance input so that the intercept does not affect the signal traveling on the aortic channel 803. Thus, with the intercept device of this embodiment, again, it is not necessary to calibrate the intercept signal since only three calibration / balance steps are required. Furthermore, as described above, when the catlaboratory monitor is in operation, no device needs to be disconnected in order to connect the intercept receiver to the central monitoring device. As can be seen from FIG. 8, an intercept receiver 804 is connected to a communication link including a peripheral channel 802 and an aortic channel 803, and a central monitoring device 805 is connected in parallel. This makes it very easy for medical personnel to operate.

  If the sensor inserted into the patient's body is not compatible with the communication standards used by the categorical monitors and other equipment used in connection with FFR measurements, as is actually the case now The peripheral blood pressure signal is converted by the signal conversion unit located in the peripheral blood pressure channel of the communication link so that the generated signal, ie the output of the signal conversion unit, is compliant with the communication standard used. Although this has been described above, the standard used in this type of equipment is typically ANSI / AAMI BP22-1994. The signal conversion unit is usually provided in a guide wire connector.

  Thus, in order to receive a measurement signal indicating peripheral blood pressure, an intercept receiver is usually connected to the signal conversion unit by either wired or wireless. This requires calibration. In the case of aortic blood pressure, the intercept receiver is connected to the aortic blood pressure channel of the communication link via a high impedance input to the intercept interface, whereby the intercept receiver is connected to the aortic blood pressure channel. Interception is possible. Interception does not require calibration.

  In the future, if the sensor that is inserted into the patient's body becomes compatible with the communication standards used by categorical monitors and other equipment used in connection with FFR measurements, There is no need to convert the signal by a signal conversion unit. In such cases, the intercept receiver can be connected to both the aortic blood pressure channel and the peripheral blood pressure channel via their high impedance inputs, either by wired or wireless connection. . Accordingly, the receiver of the intercept device can intercept the aortic blood pressure channel and the peripheral blood pressure channel. Again, intercept does not require calibration. With such a configuration, the intercept device of the present invention will require only two calibration steps: calibration of the peripheral blood pressure channel and the aortic blood pressure channel with respect to the central monitoring device.

  Although described with respect to specific exemplary embodiments of the present invention, many different changes and modifications will become apparent to those skilled in the art. Accordingly, the described embodiments do not limit the scope of the invention as defined by the appended claims.

Claims (11)

A system for generating and displaying a coronary flow reserve ratio (FFR) value, comprising:
An aortic pressure sensor configured to measure a blood pressure of a person's aorta and provide a sensor signal indicative of the measured blood pressure of the aorta;
A peripheral pressure sensor at the distal portion of the pressure sensor guidewire configured to measure the peripheral blood pressure of the person and provide a sensor signal indicative of the measured peripheral blood pressure;
An FFR receiver configured to generate and display an FFR value;
A wired aortic channel extending from the aortic pressure sensor to an electrical interface;
The electrical interface receives the sensor signal from the aortic pressure sensor, transmits a first signal indicative of the measured aortic blood pressure to the FFR receiver, and indicates the measured aortic blood pressure. A system configured to send a second signal to a monitor.   The system of claim 1, wherein the electrical interface is disposed along a wired aortic channel extending from the aortic pressure sensor to the monitor.   The electrical interface is electrically attached to the wired aortic channel via a high impedance device or generated by a signal passing through a conductor of the wired aortic channel. The system of claim 2, wherein the system is configured to sense at least one of a nearby magnetic field and electric field.   The system of claim 1, wherein the electrical interface transmits the first signal indicative of the measured aortic blood pressure to the FFR receiver via a wired connection.   The system of claim 1, wherein the electrical interface transmits the first signal indicative of the measured aortic blood pressure to the FFR receiver via a wireless connection.   The system of claim 1, wherein the electrical interface transmits the second signal indicative of the measured aortic blood pressure to the monitor via a wired connection.   The system of claim 1, wherein the electrical interface transmits the second signal indicative of the measured aortic blood pressure to the monitor via a wireless connection.   Further comprising the control unit configured to receive the signal indicative of the measured peripheral blood pressure via a wired connection between the peripheral pressure sensor and a control unit, the control unit from the electrical interface The system of claim 1, wherein the system is separated.   9. The system of claim 8, wherein the control unit is configured to send the signal indicative of the measured peripheral blood pressure to the FFR receiver.   The system of claim 9, wherein the control unit is configured to transmit the signal indicative of the measured peripheral blood pressure to the FFR receiver via a wireless connection.   The system of claim 1, wherein the electrical interface is connectable to a standard communication cable for connecting the aortic pressure sensor to a central monitoring device.

Images