Method and device for measuring the absorption of radiation in a portion of tissue

A device for use in measuring radiation transmitted through a portion of living tissue comprising:

• at least two spaced sensor areas, with one of the sensor areas being constructed as a radiation emitter and the other sensor area being constructed as a radiation receiver for receiving radiation from the radiation emitter after transillumination of living tissue located between the sensor areas, and
• an evaluation unit, the sensor areas coupled to said evaluation unit,
• wherein at least one of the sensor areas further comprises a tissue penetrating carrier, and wherein the tissue penetrating carrier is in the form of a spiral for screwing into the tissue.

A device for use in measuring radiation transmitted through a portion of living tissue comprising:

• at least two spaced sensor areas, one of the sensor areas being constructed as a radiation emitter for transilluminating living tissue located between the sensors areas, and the other senior area being constructed as a radiation sensor for sensing radiation from the radiation emitter;
• a measuring instrument, the sensor areas coupled to said measuring instrument, wherein at least one of the sensors areas further cover a tissue penetrating carrier;
• and means coupled to the radiation sensor for collecting information from the radiation sensor and for providing additional parameters including, at least, ECG.

A perinatal sensing system for determining the oxygen saturation of blood by the transillumination of living tissue, wherein light transmission in selected spectral ranges changes in intensity in response to different levels of oxygen saturation, comprising:

• means for generating light at an interstitial subcutaneous location within said tissue such that said generated light is transmitted to an epidermal location;
• and
• means for detecting changes in intensity of said light transmitted through to said epidermal location to determine an oxygen maturation within said tissue.

A perinatal sensing system for determining blood oxygen saturation by transillumination of living tissue, wherein the intensity of light transmitted in select spectral regions changes in response to different levels of blood oxygenation, comprising;

• means for generating light upon an epidermal location such that said generated light is transmitted to an interstitial subcutaneous location;
• and
• means at said interstitial subcutaneous location for detecting changes in intensity of said transmitted light in order to determine an oxygen saturation within said tissue.

A perinatal sensing system for determining blood oxygen saturation within body living tissue by transillumination wherein the light transmission changes in intensity in response to different levels of oxygen saturation, comprising:

• means for generating light at a first interstitial subcutaneous location within said tissue;
• and
• means for receiving light at a second interstitial subcutaneous location within said tissue in order to detect the changes in intensity of said light transmitted through said living tissue between said first and said second interstitial location in order to determine a the oxygen saturation of the blood.

A method for measuring the intensity of light transmitted through a portion of living tissue carrying arterial blood comprising the steps of providing at least two spaced sensor areas, at least one of which is a radiation emitter and at least one of which is a radiation receiver, and invasively introducing at least one sensor area into said living tissue in a manner whereby a portion of said living tissue is between the sensor areas for its transillumination, wherein the radiation emitter emits at least a first and a second spectral range which are received by the radiation receiver, wherein oxygen saturation is a function of both the pulsatile and the steady light absorption in said first and second spectral ranges, and wherein said first spectral range is adapted to measuring the total hemoglobin level and said second spectral range is adapted to measuring oxyhemoglobin.

A device for use in measuring radiation transmitted through a portion of living tissue comprising at least two spaced sensor areas, with one of the sensor areas being constructed as a radiation emitter and the other sensor area being constructed as a radiation receiver for sensing radiation transilluminated through living tissue from the radiation emitter, and

• a measuring instrument, the sensor areas coupled to said measuring instrument,
• wherein at least one of the sensor areas further comprises a tissue penetrating carrier, wherein one of said sensor areas is positionable in living tissue and is an electro-optical converter.

A perinatal sensing system for determining blood oxygenation within a body comprising:

• means for generating light at an interstitial subcutaneous location within a body;
• means for transmitting said generated light from said subcutaneous location to an epidermal location of a body, and means for detecting changes in intensity of said light transmitted through the tissue to said epidermal location wherein the transmitted light passing through the body changes in intensity in response to different levels of blood oxygenation;
• in order to determine blood oxygenation within said body.

A device for use in measuring radiation transmitted through a portion of living tissue, said device comprising a sensor carrier carrying two sensor areas, one of which is a radiation emitter and the other of which is a radiation receiver, said sensor carrier adapted for introducing at least one of said sensor areas into an interstitial subcutaneous location within a body, said radiation emitter transmitting light at a spectral range which changes in intensity in response to different levels of blood oxygenation saturation when passing in arteries and arterioles through said living tissue, said radiation receiver sensing said changes in intensity of said transmitted light.