Intracorporeal substance measuring assembly

• US 20050221277A1
• Filed: 03/25/2005
• Published: 10/06/2005
• Est. Priority Date: 03/31/2004
• Status: Active Grant

• Current Assignee: Terumo Kabushiki Kaisha (Terumo Corporation)
• Original Assignee: Terumo Kabushiki Kaisha (Terumo Corporation)
• Inventors: Kawanishi, Tetsuro
• Granted Patent: US 7,450,980 B2
• Time in Patent Office: Days
• US Class Current: 435/4
• CPC Class Codes: A61B 5/14532 for measuring glucose, e.g. by tissue impedance measurement
• CPC Class Codes: A61B 5/1459 invasive, e.g. introduced into the body by a catheter A61B5/1464 takes precedence

Abstract

An intracorporeal substance measuring assembly to be provided in an embedded-type substance sensor for detecting and measuring an intercorporeal analyte includes: a detection layer containing at least one fluorescent indicator for generating fluorescence according to the concentration of the analyte; and an optical separation layer which is provided on the detection layer, is optically opaque, permits the analyte to penetrate therethrough, and prevents the penetration therethrough of at least one of living body substances possibly deteriorating the detection layer and/or obstructing the fluorescence.

Claims

1. An intracorporeal substance measuring assembly provided in an embedded type substance sensor for detecting and measuring an intracorporeal analyte, comprising:

a detection layer containing at least one fluorescent indicator generating fluorescence according to the concentration of said analyte; and

an optical separation layer on one side of said detection layer, and which is optically opaque and permits said analyte to penetrate therethrough.

2. The intracorporeal substance measuring assembly as set forth in claim 1, wherein said detection layer is comprised of a base material to which said fluorescent indicator is bound.

3. The intracorporeal substance measuring assembly as set forth in claim 1, wherein where said analyte is a saccharide, and said fluorescent indicator is a fluorescent substance containing phenylboronic acid.

4. The intracorporeal substance measuring assembly as set forth in claim 3, wherein said fluorescent substance containing phenylboronic acid is represented by the following chemical formula (1):

where Q is a fluorescent residual group, at least one of R1, R2, and R3 is an active group to be bound to said base material of said detection layer, R4, R5, R6, and R7 are each at least one substituent group selected from the group consisting of hydrogen atom, alkyl, alkenyl, allyl, allylalkenyl, substituted alkyl, oxyalkyl, acyl, and halogen atom.

5. The intracorporeal substance measuring assembly as set forth in claim 4, wherein Q is a fluorescent residual group containing anthracene.

6. The intracorporeal substance measuring assembly as set forth in claim 1, wherein said optical separation layer is comprised of an opaque substance and a base material for supporting said opaque substance.

7. The intracorporeal substance measuring assembly as set forth in claim 1, wherein said optical separation layer is a polymeric porous film formed by a phase transition method.

8. The intracorporeal substance measuring assembly as set forth in claim 6, wherein said opaque substance is comprised of at least one substance selected from the group consisting of carbon black, fullerene, and carbon nanotube.

9. The intracorporeal substance measuring assembly as set forth in claim 1, wherein said optical separation layer does not permit intracorporeal components that deteriorate said detection layer to penetrate therethrough.

10. The intracorporeal substance measuring assembly as set forth in claim 9, wherein said optical separation layer inactivates said intracorporeal components.

11. A method of producing an intracorporeal substance measuring assembly provided in an embedded type substance sensor for detecting and measuring an intracorporeal analyte which includes:

a detection layer containing at least one fluorescent indicator fluoresces according to the concentration of said analyte; and

an optical separation layer disposed on one side of said detection layer that is optically opaque and permits said analyte to penetrate therethrough,

said method comprising the steps of;

adding to said detection layer a precursor for forming said optical separation layer, and thereafter binding said precursor to said detection layer.

12. A method of producing an intracorporeal substance measuring assembly provided in an embedded type substance sensor for detecting and measuring an intracorporeal analyte which includes:

a detection layer containing at least one fluorescent indicator that fluoresces according to the concentration of said analyte; and

an optical separation layer disposed on one side of said detection layer that is optically opaque, and permits said analyte to penetrate therethrough,

said method comprising the step of adhering a peripheral portion of said optical separation layer to the periphery of said detection layer.

13. An embedded type substance sensor comprising:

an intracorporeal substance measuring assembly provided in an embedded type substance sensor for detecting and measuring an intracorporeal analyte which including;

a detection layer containing at least one fluorescent indicator that fluoresces according to the concentration of said analyte; and

an optical separation layer disposed on one side of said detection layer that is optically opaque, and permits said analyte to penetrate therethrough;

a light source oriented to irradiate said detection layer from the detection layer side of said intracorporeal substance measuring assembly; and

a photo-detector oriented to detect fluorescence from said detection layer.

14. The embedded type substance sensor as set forth in claim 13, wherein the optical separation layer side of said intracorporeal substance measuring assembly is in contact with a living body.