# US 2010/0168565 A1 · System for measuring blood pressure in an artery

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- Number: US 2010/0168565 A1
- Document ID: US20100168565A1
- Status: Published application
- Kind: A1
- Application number: 12/521,134
- Filed: 2007-12-20
- Published: 2010-07-01
- Earliest claimed: 2007-01-04
- Assignees: Sense A/S
- Inventors: Lars Lading
- Web page: https://patentgrep.com/patent/US20100168565A1

## CPC

- A61B 5/0002: {Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network (endoradiosondes A61B5/07)}
- A61B 5/022: by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers
- A61B 5/681: {Wristwatch-type devices}
- A61B 2560/0261: using hydrostatic pressure
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## 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

### Claim 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.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 1)

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.

### Claim 4 (depends on 3)

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

### Claim 5 (depends on 4)

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.

### Claim 6 (depends on 5)

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

### Claim 7 (depends on 1)

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

### Claim 8 (depends on 7)

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.

### Claim 9 (depends on 1)

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.