Abstract: A measurement system may comprise a sensor wire and a transceiver unit. The sensor wire may comprise an insertable portion configured to be inserted in a blood vessel of a patient's body and a sensor disposed within the insertable portion at a distal end of the sensor wire. The sensor is configured to measure a parameter when inserted inside the patient. The transceiver unit may comprise: a housing adapted to be connected to a proximal end of the sensor wire; and a first communication module within the housing adapted to wirelessly communicate by a communication signal with an external second communication module in order to transfer information to the external second communication module.

Abstract: Sensor wire assembly for measuring a physiological variable in a body, said assembly comprises a sensor element for measuring the physiological variable and to generate a sensor signal in response of said variable, and a guide wire having said sensor element at its distal end, and adapted to be inserted into the body in order to position the sensor element within the body. The assembly further comprises a sensor signal adapting circuitry, being an integrated part of said assembly, wherein the sensor signal is applied to the adapting circuitry that is adapted to automatically generate an output signal, related to the sensor signal, in a standardized format such that the measured physiological variable is retrievable by an external physiology monitor.

Abstract: A measurement system may comprise a sensor wire and a transceiver unit. The sensor wire may comprise an insertable portion configured to be inserted in a blood vessel of a patient's body and a sensor disposed within the insertable portion at a distal end of the sensor wire. The sensor is configured to measure a parameter when inserted inside the patient. The transceiver unit may comprise: a housing adapted to be connected to a proximal end of the sensor wire; and a first communication module within the housing adapted to wirelessly communicate by a communication signal with an external second communication module in order to transfer information to the external second communication module.

Abstract: A measurement system, comprises a sensor wire and a transceiver unit. The sensor wire comprises an insertable portion configured to be inserted in a blood vessel of a patient's body and a sensor disposed within the insertable portion at a distal end of the sensor wire. The sensor is configured to measure a variable inside the patient. The transceiver unit comprises: a housing adapted to be connected to a proximal end of the sensor wire; and a first communication module within the housing adapted to wirelessly communicate by a communication signal with an external second communication module in order to transfer information to the external second communication module. The communication signal, including sensor values, is generated by the transceiver unit and transferred as a data stream. The housing is configured to remain external to the patient's body.

Abstract: A measurement system may comprise a sensor wire and a transceiver unit. The sensor wire may comprise an insertable portion configured to be inserted in a blood vessel of a patient's body and a sensor disposed within the insertable portion at a distal end of the sensor wire. The sensor is configured to measure a parameter when inserted inside the patient. The transceiver unit may comprise: a housing adapted to be connected to a proximal end of the sensor wire; and a first communication module within the housing adapted to wirelessly communicate by a communication signal with an external second communication module in order to transfer information to the external second communication module.

Abstract: Pressure measurement system comprising a pressure sensor wire with a pressure sensor to measure pressure inside a patient, and to provide measured pressure data to an external device. The pressure sensor wire is adapted to be connected, at its proximal end, to a transceiver unit that is adapted to wirelessly communicate via a communication signal with a communication unit arranged in connection with an external device, in order to transfer measured pressure data to the external device. The pressure data to be transferred is generated by the transceiver unit and transferred as a data stream. Preferably, the communication signal is a radio frequency signal.

Abstract: The present invention relates to a sensor assembly arranged to be disposed in a body for measuring a physiological variable. A basic idea of the present invention is to provide a sensor and guide wire assembly which communicates with an external unit by an inductive coupling between a first coil provided in the sensor assembly and a second, external coil which is disposed in or connected to the external unit. The external unit is preferably the same unit that is used to numerically or graphically display the physiological variables that are measured with the sensor and guide wire assembly. With the terminology introduced above, it should here be clear that both the signal transfer from the sensor as well as the energy feeding from the external unit to the sensor may be accomplished through the inductive coupling between the first and second coils.

Abstract: Pressure measurement system comprising a pressure sensor wire with a pressure sensor to measure pressure inside a patient, and to provide measured pressure data to an external device. The pressure sensor wire is adapted to be connected, at its proximal end, to a transceiver unit that is adapted to wirelessly communicate via a communication signal with a communication unit arranged in connection with an external device, in order to transfer measured pressure data to the external device. The pressure data to be transferred is generated by the transceiver unit and transferred as a data stream. Preferably, the communication signal is a radio frequency signal.

Abstract: A sensor and insertion assembly 2 is used for intravascular measurement of pressure in a living body. The assembly includes, a sensor chip 6 having a substrate body 8 with a recess covered by a pressure sensitive film 10 thereby forming a cavity 12. A piezoelectric element, preferably in the form of a piezoelectric film 14, is arranged in connection with the pressure sensitive film, and energy is applied to the piezoelectric element such that acoustic waves are generated in the element. The piezoelectric element is arranged to generate an output signal, representing the pressure at the film, in dependence on the measured properties of the acoustic waves related to the deflection of the pressure sensitive film.

Abstract: The present invention relates to a method and a device for reducing leakage current in a guide wire assembly having conductor members (707, 708) arranged at a connector end of the guide wire (702) to provide electrical contact with electrical leads (705, 706) of the guide wire and to provide signals transferred via the electrical leads to an external device, said conductor members being separated by at least one insulator (709). An idea of the present invention is to minimize leakage current via the at least one insulator. When a physician places the guide wire into an appropriate location in the body, a male connector (100) of the guide wire may be contaminated by, for example, dirt, fat, moisture, etc., which is attached to the physician's fingers and deposited onto the male connector. An electrode (710) mounted at the female connector is used to apply a guard potential (Ud) to the insulator (709) to reduce potential difference and thereby reduce current leakage between members (707, 708).

Abstract: The present invention relates to a sensor assembly arranged to be disposed in a body for measuring a physiological variable. A basic idea of the present invention is to provide a sensor and guide wire assembly which communicates with an external unit by an inductive coupling between a first coil provided in the sensor assembly and a second, external coil which is disposed in or connected to the external unit. The external unit is preferably the same unit that is used to numerically or graphically display the physiological variables that are measured with the sensor and guide wire assembly. With the terminology introduced above, it should here be clear that both the signal transfer from the sensor as well as the energy feeding from the external unit to the sensor may be accomplished through the inductive coupling between the first and second coils.

Abstract: A sensor and insertion assembly 2 is used for intravascular measurement of pressure in a living body. The assembly includes a sensor chip 6 having a substrate body 8 with a recess covered by a pressure sensitive film 10 thereby forming a cavity 12. A piezoelectric element, preferably in the form of a piezoelectric film 14, is arranged in connection with the pressure sensitive film, and energy is applied to the piezoelectric element such that acoustic waves are generated in the element. The piezoelectric element is arranged to generate an output signal, representing the pressure at the film, in dependence on the measured properties of the acoustic waves related to the deflection of the pressure sensitive film.

Abstract: The invention relates to a sensor and guide wire assembly (20) for intravascular measurements of physiological variables in a living body, comprising a core wire (21) and a sensor element (22). The sensor and guide wire assembly (20) comprises further a jacket (25; 35; 45) provided with a first opening (26; 36; 46), in which at least a portion of the sensor element (22) is arranged, and a second opening (27; 37; 47), in which a portion of the core wire (21) is arranged, the first opening (26; 36; 46) and the second opening (27; 37; 47) being separated from each other.

Abstract: Sensor wire assembly for measuring a physiological variable in a body, said assembly comprises a sensor element for measuring the physiological variable and to generate a sensor signal in response of said variable, and a guide wire having said sensor element at its distal end, and adapted to be inserted into the body in order to position the sensor element within the body. The assembly further comprises a sensor signal adapting circuitry, being an integrated part of said assembly, wherein the sensor signal is applied to the adapting circuitry that is adapted to automatically generate an output signal, related to the sensor signal, in a standardized format such that the measured physiological variable is retrievable by an external physiology monitor.

Abstract: The present invention relates to a system and a method of measuring a physiological variable in a body. A basic idea of the present invention is to measure a physiological variable in a body by means of employing a sensor (314) which is arranged to be disposed in the body for measuring the physiological variable. The sensor must be provided with a supply voltage in order to be operable. Therefore, a control unit (322) disposed outside the body provides this supply voltage to the sensor. The control unit also receives, from the sensor, via a wired connection (311), signals that represent the physiological variables that are measured. The control unit is arranged with a communication interface (401, 701) and a modulator (301) for wireless spread spectrum communication of the measured physiological variables for presentation purposes.

Abstract: The present invention relates to a method and a device for reducing leakage current in a guide wire assembly having conductor members (707, 708) arranged at a connector end of the guide wire (702) to provide electrical contact with electrical leads (705, 706) of the guide wire and to provide signals transferred via the electrical leads to an external device, said conductor members being separated by at least one insulator (709). An idea of the present invention is to minimize leakage current via the least one insulator. When a physician places the guide wire into an appropriate location in the body, a male connector (100) of the guide wire may be contaminated by, for example, dirt, fat, moist, etc., which is attached to the physician's fingers and deposited onto the male connector. Leakage currents may also be due to general deteriorations in insulating capacity, for example arising from manufacturing defects.

Abstract: The present invention relates to a system and a method of measuring a physiological variable in a body. A basic idea of the present invention is to measure a physiological variable in a body by means of employing a sensor (314) which is arranged to be disposed in the body for measuring the physiological variable. The sensor must be provided with a supply voltage in order to be operable. Therefore, a control unit (322) disposed outside the body provides this supply voltage to the sensor. The control unit also receives, from the sensor, via a wired connection (311), signals that represent the physiological variables that are measured. The control unit is arranged with a communication interface (401, 701) and a modulator (301) for wireless communication of the measured physiological variables for presentation purposes.

Abstract: The invention relates to a sensor and guide wire assembly (20) for intravascular measurements of physiological variables in a living body, comprising a core wire (21) and a sensor element (22). The sensor and guide wire assembly (20) comprises further a jacket (25; 35; 45) provided with a first opening (26; 36; 46), in which at least a portion of the sensor element (22) is arranged, and a second opening (27; 37; 47), in which a portion of the core wire (21) is arranged, the first opening (26; 36; 46) and the second opening (27; 37; 47) being separated from each other.

Abstract: When a bolus dose of cold saline is injected into a catheter where a wire, carrying a sensor unit and electrical leads for signal transmission, is located, the lead resistance is affected by the cold saline thereby altering the resistivity. However, by countering this effect and measuring the change needed to affect this countermeasure, a resistance variation curve can be generated. An accurate starting point for the determination of a transit time can be derived from the curve. Using conventional flow measurement calculations with the accurate starting point yields a better understanding of the flow profile in an artery based on the transit time.

Abstract: This invention relates to a method and system for monitoring, determining by measurement and calculation and graphically displaying physiological variables related to blood pressure. At least two physiological variables, arterial pressure (Pa) and distal coronary pressure (Pd), are detected by and derived from a guidewire-mounted pressure sensor. The Myocordial Fractional Flow Reserve (FFRmyo) is determined by calculating a ratio Pd/Pa from the measured physiological variables (Pa, Pd) and a graph is formed and displayed of the data resulting from the calculation. The invention also provides an interactive graphical user interface system for controlling the calculation of and for displaying, in at least one screen on a display in a monitoring unit, intermediate and final results of the method.