Catheter head

• US 20070010727A1
• Filed: 04/23/2004
• Published: 01/11/2007
• Est. Priority Date: 04/24/2003
• Status: Active Grant

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Rensen, Wouter, Liedenbaum, Coen Theodorus Hubertus, Van Beek, Michael
• Granted Patent: US 7,486,978 B2
• Time in Patent Office: Days
• US Class Current: 600/341
• CPC Class Codes: A61B 2562/0238 Optical sensor arrangements for performing transmission measurements on body tissue
• CPC Class Codes: A61B 5/14532 for measuring glucose, e.g. by tissue impedance measurement
• CPC Class Codes: A61B 5/14542 for measuring blood gases A61B5/14551 takes precedence
• CPC Class Codes: A61B 5/14546 for measuring analytes not otherwise provided for, e.g. ions, cytochromes
• CPC Class Codes: A61B 5/1459 invasive, e.g. introduced into the body by a catheter A61B5/1464 takes precedence
• CPC Class Codes: A61B 6/481 involving the use of contrast agents
• CPC Class Codes: A61B 6/504 for diagnosis of blood vessels, e.g. by angiography

Abstract

The present invention relates to a catheter head comprising: means (104, 108; 306, 304; 320, 322; 326; 338) for directing of radiation to a blood detection volume (220, 310), means (104, 108; 306, 304; 320; 322; 326; 332, 334, 330; 338) for receiving of return radiation from the blood detection volume, means (104; 306; 330) for transmitting of the return radiation to means (122) for analysis of the return radiation for determination of at least one property of the blood.

Claims

1. A catheter head comprising:

means for directing of radiation to a blood detection volume,

means for receiving of return radiation from the blood detection volume,

means for transmitting of the return radiation to means for analysis of the return radiation for determination of at least one property of the blood.

2. The catheter head of claim 1 having an optical wave guide for guiding of the laser radiation to the blood detection volume and for receiving of the Raman scattered radiation for transmission to the means for spectroscopic analysis.

3. The catheter head of claim 1, having an objective lens in front of the optical wave guide.

4. The catheter head of claims 1, further comprising a housings, the detection volume being located inside the housing, the detection volume preferably being located inside a cavity of the housing, the housing having an opening (to enable a blood flow into the cavity.

5. The catheter head of claims 1, further comprising channel means for conducting a blood flow through the blood detection volume+(10, and preferably further comprising a housing having an elongated shape, a front opening and a side opening being formed in the housing, and the front opening and the side opening being connected by the channel means.

6. The catheter head of claims 1, the blood detection volume being located inside a housings, the housing having an opening for enabling a blood flow into the blood detection volume, and a mesh to prevent red and/or white blood cells from entering into the blood detection volume.

7. The catheter head of claims 1, further comprising a spherical mirror for reflection of the laser radiation back into the blood detection volume, and preferably further comprising an ellipsoidal mirror, the blood detection volume comprising one of the focal points of the ellipsoidal mirror.

8. The catheter head of claim 7, a distal end of the optical wave guide being located at the other focal point of the ellipsoidal mirror, and further comprising means for conducting of blood to the blood detection volume inside the ellipsoidal mirror.

9. The catheter head of claims 1, further comprising a cavity being formed by a mirror within a housing, the blood detection volume being located in the proximity of a distal end of the optical wave guide.

10. The catheter head of claims 1, having a cavity having a half-round shape, the spherical side of the cavity being coated in order to act as a mirror for the laser radiation and the Raman scattered radiation.