Blood flowmeter and sensor part of the blood flowmeter
First Claim
1. A sensor part of a blood flowmeter for measuring a value on blood flow in tissue of a living body by emitting light to said tissue of a living body and receiving scattered light from said tissue of a living body, wherein the value on blood flow is calculated based on Doppler shifts in the scattered light, said sensor part comprising:
- a light emitter for emitting light to tissue of a living body, wherein said light emitter is a laser diode which emits light having a wavelength of about 1.3 μ
m;
a light detector for receiving said scattered light from said tissue of a living body;
a first shading structure on said semiconductor substrate for preventing light emitted from said light emitter from directly entering said light detector; and
a second shading structure on said semiconductor substrate in front of said light detector, said second shading structure having a predetermined gap;
wherein said light emitter and said light detector are integrated on a semiconductor substrate, and the sensor part includes an optical waveguide on said semiconductor substrate for outputting light emitted from said light emitter to said tissue of a living body by converting said light emitted from said light emitter into convergent light or parallel light, wherein said optical waveguide includes a bottom cladding, a core and a top cladding, and the light emitted from said light emitter propagates through the core, andwherein a ratio of said predetermined gap of said second shading structure to a lateral length of the semiconductor substrate is about 2%.
1 Assignment
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Accused Products
Abstract
A sensor part of a blood flowmeter for measuring a value on blood flow in tissue of a living body is provided, in which the sensor part includes: a light emitter for emitting light to tissue of a living body; and a light detector for receiving scattered light from the tissue; a first shading block for preventing light emitted from the light emitter from directly entering the light detector; a second shading block having a predetermined gap in front of the light detector, wherein the light emitter, the light detector and the shading blocks are integrated on a semiconductor substrate.
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Citations
27 Claims
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1. A sensor part of a blood flowmeter for measuring a value on blood flow in tissue of a living body by emitting light to said tissue of a living body and receiving scattered light from said tissue of a living body, wherein the value on blood flow is calculated based on Doppler shifts in the scattered light, said sensor part comprising:
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a light emitter for emitting light to tissue of a living body, wherein said light emitter is a laser diode which emits light having a wavelength of about 1.3 μ
m;a light detector for receiving said scattered light from said tissue of a living body; a first shading structure on said semiconductor substrate for preventing light emitted from said light emitter from directly entering said light detector; and a second shading structure on said semiconductor substrate in front of said light detector, said second shading structure having a predetermined gap; wherein said light emitter and said light detector are integrated on a semiconductor substrate, and the sensor part includes an optical waveguide on said semiconductor substrate for outputting light emitted from said light emitter to said tissue of a living body by converting said light emitted from said light emitter into convergent light or parallel light, wherein said optical waveguide includes a bottom cladding, a core and a top cladding, and the light emitted from said light emitter propagates through the core, and wherein a ratio of said predetermined gap of said second shading structure to a lateral length of the semiconductor substrate is about 2%. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A blood flowmeter for measuring a value on blood flow in tissue of a living body by emitting light to said tissue of a living body and receiving scattered light from said tissue of a living body, said blood flowmeter comprising a sensor part and a processor that receives a signal from the sensor part and computes the value on blood flow based on Doppler shifts in the scattered light, said sensor part comprising:
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a light emitter for emitting light to tissue of a living body, wherein said light emitter is a laser diode which emits light having a wavelength of about 1.3 μ
m;a light detector for receiving said scattered light from said tissue of a living body; a first shading structure on said semiconductor substrate for preventing light emitted from said light emitter from directly entering said light detector; and a second shading structure on said semiconductor substrate in front of said light detector, said second shading structure having a predetermined gap; wherein said light emitter and said light detector are integrated on a semiconductor substrate, and the sensor part includes an optical waveguide on said semiconductor substrate for outputting light emitted from said light emitter to said tissue of a living body by converting said light emitted from said light emitter into convergent light or parallel light, wherein said optical waveguide includes a bottom cladding, a core and a top cladding, and the light emitted from said light emitter propagates through the core, and wherein a ratio of said predetermined gap of said second shading structure to a lateral length of the semiconductor substrate is about 2%. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A sensor part of a blood flowmeter for measuring a value on blood flow in tissue of a living body by emitting light to said tissue of a living body and receiving scattered light from said tissue of a living body, wherein the value on blood flow is calculated based on Doppler shifts in the scattered light, said sensor part comprising:
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a light emitter for emitting light to tissue of a living body, wherein said light emitter is a laser diode which emits light having a wavelength of about 1.3 μ
m;a light detector for receiving said scattered light from said tissue of a living body; a first shading structure on said semiconductor substrate for preventing light emitted from said light emitter from directly entering said light detector; and a second shading structure on said semiconductor substrate in front of said light detector, said second shading structure having a predetermined gap; wherein said light emitter and said light detector are integrated on a semiconductor substrate, and the sensor part includes an optical waveguide on said semiconductor substrate for outputting light emitted from said light emitter to said tissue of a living body by converting said light emitted from said light emitter into convergent light or parallel light, wherein said optical waveguide includes a bottom cladding, a core and a top cladding, and the light emitted from said light emitter propagates through the core, and wherein said predetermined gap of said second shading structure is about 65 μ
m.
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15. The A blood flowmeter for measuring a value on blood flow in tissue of a living body by emitting light to said tissue of a living body and receiving scattered light from said tissue of a living body, said blood flowmeter comprising a sensor part and a processor that receives a signal from the sensor part and computes the value on blood flow based on Doppler shifts in the scattered light, said sensor part comprising:
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a light emitter for emitting light to tissue of a living body, wherein said light emitter is a laser diode which emits light having a wavelength of about 1.3 μ
m;a light detector for receiving said scattered light from said tissue of a living body; a first shading structure on said semiconductor substrate for preventing light emitted from said light emitter from directly entering said light detector; and a second shading structure on said semiconductor substrate in front of said light detector, said second shading structure having a predetermined gap; wherein said light emitter and said light detector are integrated on a semiconductor substrate, and the sensor part includes an optical waveguide on said semiconductor substrate for outputting light emitted from said light emitter to said tissue of a living body by converting said light emitted from said light emitter into convergent light or parallel light, wherein said optical waveguide includes a bottom cladding, a core and a top cladding, and the light emitted from said light emitter propagates through the core, and wherein said predetermined gap of said second shading structure is about 65 μ
m.
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16. A sensor part of a blood flowmeter for measuring a value on blood flow in tissue of a living body by emitting light to said tissue of a living body and receiving scattered light from said tissue of a living body, wherein the value on blood flow is calculated based on Doppler shifts in the scattered light, said sensor part comprising:
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a light emitter for emitting light to tissue of a living body; and a light detector for receiving said scattered light from said tissue of a living body; wherein said light emitter and said light detector are integrated on a semiconductor substrate, said sensor part further comprising a first shading structure on said semiconductor substrate for preventing light emitted from said light emitter from directly entering said light detector, and a second shading structure on said semiconductor substrate in front of said light detector, said second shading structure having a predetermined gap, wherein the sensor part includes an optical waveguide on said semiconductor substrate for outputting light emitted from said light emitter to said tissue of a living body by converting said light emitted from said light emitter into convergent light or parallel light, wherein said optical waveguide includes a bottom cladding, a core and a top cladding, and the light emitted from said light emitter propagates through the core, and wherein a ratio of said predetermined gap of said second shading structure to a lateral length of the semiconductor substrate is about 2%. - View Dependent Claims (17, 18, 19)
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20. A sensor part of a blood flowmeter for measuring a value on blood flow in tissue of a living body by emitting light to said tissue of a living body and receiving scattered light from said tissue of a living body, wherein the value on blood flow is calculated based on Doppler shifts in the scattered light, said sensor part comprising:
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a light emitter for emitting light to tissue of a living body; and a light detector for receiving said scattered light from said tissue of a living body; wherein said light emitter and said light detector are integrated on a semiconductor substrate, said sensor part further comprising a first shading structure on said semiconductor substrate for preventing light emitted from said light emitter from directly entering said light detector, and a second shading structure on said semiconductor substrate in front of said light detector, said second shading structure having a predetermined gap, wherein the sensor part includes an optical waveguide on said semiconductor substrate for outputting light emitted from said light emitter to said tissue of a living body by converting said light emitted from said light emitter into convergent light or parallel light, wherein said optical waveguide includes a bottom cladding, a core and a top cladding, and the light emitted from said light emitter propagates through the core, and wherein said predetermined gap of said second shading structure is about 65 μ
m.
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21. A blood flowmeter for measuring a value on blood flow in tissue of a living body by emitting light to said tissue of a living body and receiving scattered light from said tissue of a living body, said blood flowmeter comprising a sensor part and a processor that receives a signal from the sensor part and computes the value on blood flow based on Doppler shifts in the scattered light, said sensor part comprising:
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a light emitter for emitting light to tissue of a living body; and a light detector for receiving said scattered light from said tissue of a living body; wherein said light emitter and said light detector are integrated on a semiconductor substrate, said sensor part further comprising a first shading structure on said semiconductor substrate for preventing light emitted from said light emitter from directly entering said light detector, and a second shading structure on said semiconductor substrate in front of said light detector, said second shading structure having a predetermined gap, wherein a ratio of said predetermined gap of said second shading structure to a lateral length of the semiconductor substrate is about 2%, and wherein the sensor part includes an optical waveguide on said semiconductor substrate for outputting light emitted from said light emitter to said tissue of a living body by converting said light emitted from said light emitter into convergent light or parallel light, wherein said optical waveguide includes a bottom cladding, a core and a top cladding, and the light emitted from said light emitter propagates through the core. - View Dependent Claims (22, 23, 24, 25, 26)
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27. A blood flowmeter for measuring a value on blood flow in tissue of a living body by emitting light to said tissue of a living body and receiving scattered light from said tissue of a living body, said blood flowmeter comprising a sensor part and a processor that receives a signal from the sensor part and computes the value on blood flow based on Doppler shifts in the scattered light, said sensor part comprising:
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a light emitter for emitting light to tissue of a living body; and a light detector for receiving said scattered light from said tissue of a living body; wherein said light emitter and said light detector are integrated on a semiconductor substrate, said sensor part further comprising a first shading structure on said semiconductor substrate for preventing light emitted from said light emitter from directly entering said light detector, and a second shading structure on said semiconductor substrate in front of said light detector, said second shading structure having a predetermined gap, wherein the sensor part includes an optical waveguide on said semiconductor substrate for outputting light emitted from said light emitter to said tissue of a living body by converting said light emitted from said light emitter into convergent light or parallel light, wherein said optical waveguide includes a bottom cladding, a core and a top cladding, and the light emitted from said light emitter propagates through the core; wherein said predetermined gap of said second shading structure is about 65 μ
m.
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Specification