For example, pressure changes in various body chambers, such as blood pressures in chambers of the heart, may be used for diagnosis and/or treatment of a number of conditions. Monitoring pressures and pressure changes in a human body is often an important component of a medical or surgical diagnosis or therapy.
The integrated circuit of claim 5, wherein the second terminal is coupled to a conductor provided in the implantable lead. The integrated circuit of claim 5, wherein during a third time interval the control circuit communicates a digital signal indicating the measured voltage through the first and second terminals.ħ. An integrated circuit for measuring cardiac pressure, the integrated circuit comprising: a first terminal coupled to a conductor provided in an implanted lead a second terminal and a control circuit comprising a clock recovery circuit, the control circuit coupled to the first and second terminals wherein, during a first time interval, when digital configuration signals are provided from the controller on the first terminal, the control circuit selectively configures a selected pressure sensor, and wherein, during a second time interval, the control circuit administers electrical signals to the pressure sensor and measures a response voltage from the pressure sensor, and wherein the clock recovery circuit recovers a clock signal from received configuration signals.Ħ. A method for measuring cardiac pressure, the method comprising: providing a power supply voltage for a number of control chips over two wires, each control chip coupled to one or more pressure sensors transmitting a number of bit sequences carrying address information with the power supply voltage over the two wires configuring a pressure sensor for measuring cardiac pressure and receiving a digital signal indicating a measured cardiac pressure, wherein the one or more pressure sensors includes a Wheatstone bridge, wherein the transmitting a number of bit sequences over the two wires involves modulating the power supply voltage with a digital signal, and wherein the power supply voltage is provided for approximately 50 μs.ĥ. The method of claim 1, wherein the power supply voltage is provided for approximately 50 μs.Ĥ. The method of claim 1, wherein the digital signal is a frequency-shift-keying (FSK) modulated signal.ģ. A method for measuring cardiac pressure, the method comprising: providing a power supply voltage for a number of control chips over two wires, each control chip coupled to one or more pressure sensors transmitting a number of bit sequences carrying address information with the power supply voltage over the two wires configuring a pressure sensor for measuring cardiac pressure and receiving a digital signal indicating a measured cardiac pressure, wherein the one or more pressure sensors includes a Wheatstone bridge and wherein the transmitting a number of bit sequences over the two wires involves modulating the power supply voltage with a digital signal.Ģ. Semiconductor strain gauge with elastic load plateĪpparatus and method for implanted self-powered medication dispensingġ. Miniature closed-loop dynamic universal mechanical testing machine
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