SYSTEM FOR MEASURING BLOOD PRESSURE IN AN ARTERY

• US 20100168565A1
• Filed: 12/20/2007
• Published: 07/01/2010
• Est. Priority Date: 01/04/2007
• Status: Abandoned Application

• Current Assignee: Sense Corp (CGI, Inc.)
• Original Assignee: Sense Corp (CGI, Inc.)
• Inventors: Lading, Lars
• Application Number:
  US12/521,134
• Publication Number:
  US 20100168565A1
• Time in Patent Office: Days
• US Class Current: 600/437
• CPC Class Codes: A61B 2560/0261 using hydrostatic pressure
• CPC Class Codes: A61B 5/0002 Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network A61B5/07 takes precedence; transmission systems for measured values G08C; transmission H04B; transmission of digital information H04L; wireless communication networks H04W
• CPC Class Codes: A61B 5/022 by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers
• CPC Class Codes: A61B 5/681 Wristwatch-type devices

Abstract

A sensor system for measuring the blood pressure in such a way that the sensing position is in a correct position relative to the heart is devised. The system consists of a wireless sensing device, a transceiver, and a computing and recording device. The sensor reading is recorded wirelessly. The sensor is placed at a convenient location on the body. The coupling antennas are designed in such a way that the antenna characteristics ensures that only when the sensors is within a predetermined position relative to the heart will a recording of the blood pressure actually take place.

Claims

1. A system for measuring blood pressure in an artery by wireless reading of a sensor comprising:

a sensor having a sensor antenna, the sensor being mounted in close proximity to an artery and emitting a sensor signal in response to the blood pressure in the artery, and wherein the sensor antenna allows for wireless reading of the sensor signal, and

a transceiver having a transceiver antenna and being adapted to wirelessly read the sensor signal from a position close to the heart of the patient,

wherein antenna properties of the sensor antenna and the transceiver antenna are designed so that a reading of the sensor signal can only be performed when the sensor is within a predetermined space relative to the transceiver.

2. A system according to claim 1, wherein the sensor antenna is designed to have a direction independent gain and the transceiver antenna is designed to have a directional gain which provides for a large sensitivity when the sensor is within a predetermined space relative to the transceiver and a small sensitivity when the sensor is outside this space.

3. A system according to claim 1,

wherein the wireless reading of the sensor signal is based on inductive coupling between the sensor and the transceiver.

4. A system according to claim 3, wherein a transceiver coil of the transceiver antenna is shaped so that the desired antenna characteristic is attained.

5. A system according to claim 4, wherein the transceiver coil has a loop shape with the largest dimension substantially parallel to the longitudinal axis of the patient.

6. A system according to claim 5, wherein the antenna characteristic has a cross section substantially forming an ellipse or a higher order ellipse.

7. A system according to claim 1, wherein the wireless reading of the sensor signal is based on electromagnetic waves.

8. A system according to claim 7, wherein the sensor antenna is omni directional, and the transceiver antenna is selected from the group consisting of a dipole;

a modified dipole;

a synthesized antenna based on materials with special electromagnetic properties like a ceramic material and/or a meta material;

a synthesized antenna comprising one or more split-ring resonators; and

an antenna array comprising phase delays to obtain the desired directional properties.

9. A system according to claim 1, wherein the wireless reading of the sensor signal is based on ultrasound and the transceiver is designed so as primarily to be sensitive in a horizontal plane.