Optical sampling interface system for in vivo measurement of tissue
First Claim
1. A method for noninvasively sampling a targeted measurement site, comprising the steps of:
- providing a mount having a contact surface, an aperture defined by said mount, and magnetic registration means along any of x-, y-, and z-axes;
at least a portion of said contact surface contacting a surface proximate said targeted measurement site during use;
said aperture receiving an optical probe;
wherein an area defined by said aperture comprises said measurement site; and
said mount coupling said optical probe to said targeted measurement site;
said coupling optical probe to said targeted measurement site being repeatable.
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Accused Products
Abstract
An optical sampling interface system minimizes and compensates error resulting from sampling variations and measurement site state fluctuations. Components include: an optical probe placement guide having an aperture wherein the optical probe is received, facilitates repeatable placement accuracy on surface of a tissue measurement site with minimal, repeatable disturbance to surface tissue. The aperture creates a tissue meniscus that minimizes interference due to surface irregularities and controls variation in tissue volume sampled; an occlusive element placed over the tissue meniscus isolates the meniscus from environmental fluctuations, stabilizing hydration at the site and thus, surface tension; an optical coupling medium eliminates air gaps between skin surface and optical probe; a bias correction element applies a bias correction to spectral measurements, and associated analyte measurements. When the guide is replaced, a new bias correction is determined for measurements done with the new placement. Separate components of system can be individually deployed.
20 Citations
46 Claims
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1. A method for noninvasively sampling a targeted measurement site, comprising the steps of:
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providing a mount having a contact surface, an aperture defined by said mount, and magnetic registration means along any of x-, y-, and z-axes;
at least a portion of said contact surface contacting a surface proximate said targeted measurement site during use;
said aperture receiving an optical probe;
wherein an area defined by said aperture comprises said measurement site; and
said mount coupling said optical probe to said targeted measurement site;
said coupling optical probe to said targeted measurement site being repeatable. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for coupling an optical probe to a targeted measurement site, comprising the steps of:
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providing a mount having a contact surface, said mount defining an aperture;
contacting at least a portion of said contact surface to a surface proximate said measurement site during use;
said aperture receiving said optical probe;
wherein an area inside said aperture comprises said measurement site;
said mount providing a registration point along any of x-, y-, and z-axes; and
coupling said optical probe to said measurement site via said mount with a coupling medium;
said coupling of said optical probe to said targeted measurement site being repeatable.
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17. A method for optically sampling a targeted measurement site, comprising the steps of:
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controlling variations in sample volume with an optical probe placement guide;
stabilizing surface hydration of a measurement site with an occlusion plug, said occlusion plug fitting into an aperture in said placement guide between measurements, wherein said occlusion plug is removably attached at an exterior surface of said guide. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A method for minimizing optical sampling error at a tissue measurement site due to fluctuations of surface conditions, comprising the steps of:
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providing an element defining a probe aperture, wherein at least a portion of said element is fabricated from a flexible material, wherein said element provides for stabilization of the measurement site and deformation of underlying tissue without applying undue force to a targeted tissue volume; and
inserting an occlusion plug into said aperture between measurements. - View Dependent Claims (35, 36, 37, 38, 39, 40)
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41. A method for reproducibly coupling an optical probe to a tissue measurement site, comprising the steps of:
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providing a mount having a contact surface and an aperture defined by said mount, for receiving said optical probe;
providing a plug for occluding said aperture when it is not occluded by the presence of said optical probe; and
removably attaching said plug at an exterior surface of said mount;
at least a portion of said contact surface contacting a skin surface proximate said measurement site during use;
wherein an area defined by said aperture comprises said measurement site; and
wherein said mount is contoured to approximate the surface of the measurement site. - View Dependent Claims (42, 43, 44, 45)
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46. A method for noninvasively sampling a targeted measurement site, comprising the steps of:
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providing a mount having a contact surface and an aperture defined by said mount;
optically registering a sample probe relative to said measurement site along any of x-, y-, and z-axes;
contacting at least a portion of said contact surface to a surface proximate said targeted measurement site during use;
said aperture receiving an optical probe;
an area defined by said aperture comprises said measurement site; and
coupling said optical probe to said targeted measurement site using said mount and said optical registration, said coupling of said optical probe to said targeted measurement site being repeatable.
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Specification