The invention relates to a controller unit (100) and method for controlling a cardiac prosthesis (200). The prosthesis comprising: at least one pump portion (202, 203, 602, 702); an inlet (210, 610, 710) connected to said at least one pump portion; an outlet (213, 613, 713) connected to said at least one pump portion; a pressure sensor (231; 232) configured to measure pressure of a fluid flowing from the inlet to the outlet; a pump actuator (221, 222) configured to induce the flow of the fluid flow. The controller unit further comprises a memory and a processing unit, wherein the controller unit is configured to: obtain a pressure value from the pressure sensor, obtain a desired value for the pressure of the fluid flowing into the pump, calculate an error signal equal to the difference of desired value for the pressure and the measured pressure, and control the output of the pump such that the measured pressure is near or equal to the desired pressure, by controlling a pump stroke rate and/or a pump stroke volume.

A method, including pressing a distal end of a medical probe against a wall of a body cavity, and receiving from the probe first measurements of a force exerted by the distal end on the wall. The method also includes receiving from the probe second measurements indicating a displacement of the wall in response to the force. The method further includes estimating a thickness of the wall based on the first and the second measurements.

A sensor guide wire device (200) for intravascular measurements of a physiological variable in a living body is disclosed. The sensor guide wire (200) may comprise a sensor element (213) and a connector unit (220). The connector unit (220) is attachable to a signal converting device (310). The sensor element (213) provides the signal converting device (310) with a signal indicative of a physiological variable sensed by the sensor element (213). Furthermore, the connector unit (220) comprises a battery (222). A system (300) comprising the sensor guide wire device (200) and the signal converting device (310) is also disclosed.

The present invention provides automatic zeroing and electronic level adjustment of pressure transducer in relation to patient, applied to vital signs monitors, where the automatic zeroing of circuit of pressure consists of circuit and software able to remove the value of the virtual ground voltage from the pressure calculation, and the electronic level adjustment of transducer in relation to patient consists of compensating, through software, the value in mmHg related to level difference in cmH.sub.2O informed by the user by means of monitor interface.

A measuring apparatus includes: a measuring section which performs an invasive blood pressure measurement, and which detects that a predetermined abnormal condition occurs in a blood pressure during the measurement; a detector which detects whether or not a zero point calibration is being executed on a transducer to be used in the measurement; and a notification controller which, in a case where the blood pressure measured by the measuring section is in the predetermined abnormal condition, controls whether an alarm is output or not, based on a detection state of the detector. The notification controller can select a first mode in which an alarm sound is output, or a second mode in which the alarm sound is not output, based on an elapsed time period from a predetermined timing relating to the zero point calibration, and an output from the measuring section.

A system and method for monitoring the blood pressure of a patient that allows for a device sensor to be recalibrated according to atmospheric pressure without removing the device sensor from inside the patient. This permits quickly monitoring the blood pressure of a patient if a re-zero is needed. The invention has a blood pressure monitor (BPM) that obtains an atmospheric pressure observation. The atmospheric pressure observation is adjusted and stored to memory as a zero value. The zero value is retrieved to recalibrate the system and method if a device sensor has been disconnected from and reconnected to the same or a different BPM, the patient has been moved such that the surroundings have been altered to make it necessary to recalibrate according to atmospheric pressure, and/or the device sensor has been connected to a different patient care monitor.

A calibration system for a surgical instrument. The calibration system includes an actuator, such as a motor system and a flexible shaft. The calibration system also includes a surgical instrument actuatable by the actuator. The calibration system also include calibration data corresponding to the surgical instrument. A processor is configured to process the calibration data for determining a position of the surgical instrument. The calibration system may include a sensor configured to provide a signal corresponding to a movement of the actuator, the processor being further configured to process the signal for determining a position of the surgical instrument.

The invention relates to measuring blood pressure and the calibration of said measurement. Here, the intention is to specify solutions which facilitate a more accurate and/or less burdensome measurement. To this end, it is proposed to take pressure measurements in certain respiratory states and/or to undertake the calibration by means of pressure variations without physical activity, i.e., on account of respiration or changes in position, and/or separately for systolic pressure and diastolic pressure.

A system includes: an aortic pressure sensor configured to measure aortic blood pressure of an individual; a distal sensor configured to measure a parameter in a blood vessel; a receiver configured to receive both (i) a signal representing the measured aortic blood pressure value, and (ii) a signal representing the parameter, the receiver comprising a display configured to display data that is based on at least the measured aortic blood pressure value and the measured parameter; and a communication interface configured to (i) receive a signal representing the measured aortic blood pressure value from the aortic pressure sensor via a wired connection, (ii) provide a signal representing the measured aortic blood pressure value to a monitoring device via a wired connection, and (iii) send a signal representing the measured aortic blood pressure value to the receiver via a wireless connection.

An eavesdropping arrangement for acquiring a measured physiological variable of an individual includes a receiver and a communication interface in a housing separate from the receiver. The communication interface is positioned along a communication link between a first sensor, which is configured to measure aortic blood pressure and to provide a signal representing measured aortic blood pressure, and a central monitoring device configured to monitor the measured aortic blood pressure. The communication interface includes a connection to the communication link that permits the communication interface to eavesdrop on the signal representing measured aortic blood pressure such that information representing measured aortic blood pressure is sent to the receiver while allowing the central monitoring device to receive and use the signal representing measured aortic blood pressure.