# US 7,407,487 B2 · Temperature sensing system with retrograde sensor

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- Number: US 7,407,487 B2
- Document ID: US7407487B2
- Status: Granted
- Kind: B2
- Application number: 11/080,128
- Filed: 2005-03-14
- Published: 2005-07-21
- Granted: 2008-08-05
- Earliest claimed: 2002-08-12
- Assignees: Radiant Medical, Inc.
- Inventors: Michael W. Dae; Timothy R. Machold; Paul M. Stull
- Web page: https://patentgrep.com/patent/US7407487B2

## CPC

- A61B 5/01: Measuring temperature of body parts {; Diagnostic temperature sensing, e.g. for malignant or inflamed tissue} (clinical contact thermometers G01K13/20)
- A61B 5/6851: {Guide wires}
- A61B 5/6853: {with a balloon}
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

A temperature sensing system and method for determining a patient's core body temperature by measuring the temperature of the patient's blood at a location in a vessel lumen retrograde of an insertion point of a temperature sensor or sensors into the vessel lumen.

## Claims

### Claim 1

A system for measuring the temperature of a body fluid flowing within a body lumen at a location upstream of the insertion of a temperature probe into the body lumen, comprising:
a temperature probe having a proximal end, an intermediate region having a bend formed therein and a distal region, the distal region being proximal of the bend and having a distal tip with a temperature sensor mounted thereon; and
a sheath adapted for insertion into a body lumen, the sheath having a proximal end and a distal end, the sheath having
a central lumen having a proximal opening disposed at the proximal end of the sheath, a distal opening disposed at the distal end of the sheath and a central lumen axis extending from the proximal opening to the distal opening,
a capture tube attached to the distal end of the sheath, the capture tube having a distal opening adjacent the central lumen distal opening, a proximal opening, and a lumen extending therebetween, the lumen having a lumen axis parallel to the central lumen axis, the lumen having a length, the length selected to receive and protect the distal tip and at least a portion of the distal region of the temperature probe when the sheath and temperature probe are inserted into a body lumen; and
wherein retracting the proximal end of the temperature probe from the sheath causes the distal tip of the temperature probe to move in a proximal direction, moving the distal tip out of the proximal opening of the capture tube to a desired location proximal to the proximal opening of the capture tube without additional assistance.

### Claim 2 (depends on 1)

The system of claim 1, wherein the proximal end of the temperature probe extends into the distal end of the sheath and through the central lumen.