Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Multi-channel non-invasive tissue oximeter

a tissue oximeter and multi-channel technology, applied in the field of in vivo spectrophotometric examination, can solve the problems of difficult signal-to-noise problems, distortion of brain examination data, and/or obscure of data,

Inactive Publication Date: 2014-01-28
NELLCOR PURITAN BENNETT LLC
View PDF37 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005]Notwithstanding these and other such problems, the cerebral oximeter embodying the technology of the aforementioned issued patents (now available commercially from Somanetics Corporation, of Troy, Mich.) has provided a new type of clinical instrument by which new information has been gained relative to the operation and functioning of the human brain, particularly during surgical procedures and / or injury or trauma, and this has yielded greater insight into the functioning and state of the brain during such conditions. This insight and knowledge has greatly assisted surgeons performing such relatively extreme procedures as carotid endarterectomy, brain surgery, and other complex procedures, including open-heart surgery, etc. and has led to a greater understanding and awareness of conditions and effects attributable to the hemispheric structure of the human brain, including the functional inter-relationship of the two cerebral hemispheres, which are subtly interconnected from the standpoint of blood perfusion as well as that of electrical impulses and impulse transfer.BRIEF SUMMARY OF INVENTION

Problems solved by technology

This information was not previously available, despite its great importance, since there really is no detectable arterial pulse within brain tissue itself with respect to which pulse oximetry could be utilized even if it could be effectively utilized in such an interior location (which is very doubtful), and this determination therefore requires a substantially different kind of apparatus and determination analysis.
In addition, there are a number of uniquely complicating factors, including the fact that there is both arterial and venous vasculature present in the skin and underlying tissue through which the examining light spectra must pass during both entry to and exit from the brain, and this would distort and / or obscure the brain examination data if excluded in some way.
In addition, the absorption and scatter effects on the examination light spectra are much greater in the brain and its environment than in ordinary tissue, and this tends to result in extremely low-level electrical signal outputs from the detectors for analysis, producing difficult signal-to-noise problems.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Multi-channel non-invasive tissue oximeter
  • Multi-channel non-invasive tissue oximeter
  • Multi-channel non-invasive tissue oximeter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018]FIG. 1 depicts an illustrative patient 10 on whom an instrument 12 in accordance with the present invention is being employed. As illustrated, the forehead 14 of patient 10 has a pair of sensors 16, 116 secured to it in a bilateral configuration, i.e., one such sensor on each side of the forehead, where each may monitor a different brain hermisphere. Each of the sensors 16, 116 is connected to a processor and display unit 20 which provides a central control and processing station (sometimes hereinafter, referred to as the “oximeter”) by a corresponding electrical cable 16A, 116A, which join one another at a dual-channel coupler / pre-amp 18, 118 and then (preferably) proceed to the control and processor 20 as an integrated, multiple-conductor cable 22. As will be understood, the electrical cables just noted include individual conductors for energizing light emitters and operating the related light detectors contained in sensors 16, 116, all as referred to further hereinafter and...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A method and apparatus for spectrophotometric in vivo monitoring of blood metabolites such as hemoglobin oxygen concentration at a plurality of different areas or regions on the same organ or test site on an ongoing basis, by applying a plurality of spectrophotometric sensors to a test subject at each of a corresponding plurality of testing sites and coupling each such sensor to a control and processing station, operating each of said sensors to spectrophotometrically irradiate a particular region within the test subject; detecting and receiving the light energy resulting from said spectrophotometric irradiation for each such region and conveying corresponding signals to said control and processing station, analyzing said conveyed signals to determine preselected blood metabolite data, and visually displaying the data so determined for each of a plurality of said areas or regions in a comparative manner.REEXAMINATION RESULTSThe questions raised in reexamination proceeding No. 90 / 010,128, filed Mar. 31, 2008, have been considered, and the results thereof are reflected in this reissue patent which constitutes the reexamination certificate required by 35 U.S.C. 307 as provided in 37 CFR 1.570(e) for ex parte reexaminations, or the reexamination certificate required by 35 U.S.C. 316 as provided in 37 CFR 1.997(e) for inter partes reexaminations.

Description

[0001]This application is a national stage of International Application No. PCT / US99 / 22940, filed Oct. 13, 1999, which claims the benefit of U.S. Provisional Application Ser. No. 60 / 103,985, filed Oct. 13, 1998.[0002]This invention relates generally to in vivo spectrophotometric examination and monitoring of selected blood metabolites or constituents in human and / or other living subjects, e.g., medical patients, and more particularly to spectrophotometric oximetry, by transmitting selected wavelengths (spectra) of light into a given area of the test subject, receiving the resulting light as it leaves the subject at predetermined locations, and analyzing the received light to determine the desired constituent data based on the spectral absorption which has occurred, from which metabolic information such as blood oxygen saturation may be computed for the particular volume of tissue through which the light spectra have passed.[0003]A considerable amount of scientific data and writings,...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(United States)
IPC IPC(8): A61B5/00G01J3/42A61B5/145A61B5/1455
CPCA61B5/14553A61B5/6814A61B2562/04A61B5/14552A61B2562/164
Inventor BARRETT, BRUCE J.GONOPOLSKY, OLEGSCHEUING, RICHARD S.
Owner NELLCOR PURITAN BENNETT LLC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products