OPTICAL FIBER SENSORS
The present disclosure describes the use and the manufacture of a fiber optic sensor having an angled terminal portion of a fiber optic element. In one embodiment, an optical fiber is cut at an angle and a portion of the fiber's jacket is removed near the angle so that the cladding is exposed. Light may then travel through the fiber, reflect off the angled portion, and emit through the exposed cladding into a patient. Light may also be collected from the patient using the same or a different fiber optic element having an angled terminal portion. In one embodiment, the emitted light can then be collected and analyzed to derive various physiological parameters. In certain embodiments, the fiber optic sensor may be used in environments where metallic and/or electronic sensors are not suitable.
1 . A spectrophotometric sensor, comprising:
a sensor body; and
at least one optically transmissive fiber disposed within the sensor body, wherein the optically transmissive fiber comprises an angled cut capable of reflecting light transmitted through the optically transmissive fiber outward from a patient facing surface or of reflecting light collected from the patient facing surface through the optically transmissive fiber.
2 . The spectrophotometric sensor of claim 1 , wherein at least one of the optically transmissive fibers comprises multi-mode fiber.
3 . The spectrophotometric sensor of claim 1 , wherein at least one of the optically transmissive fibers comprises single-mode fiber.
4 . The spectrophotometric sensor of claim 1 wherein the angled cut is between about 30° and about 60°.
5 . The spectrophotometric sensor of claim 1 , comprising first and second optically transmissive fibers comprising the angled cut, wherein the first and the second optically transmissive fibers are positioned to be on opposite sides of a patient tissue when in use.
6 . The spectrophotometric sensor of claim 1 , comprising first and second optically transmissive fibers comprising the angled cut, wherein the first and the second optically transmissive fibers are positioned to be on the same side of a patient tissue when in use.
7 . The spectrophotometric sensor of claim 1 , wherein the sensor body comprises a clip-style sensor body.
8 . The spectrophotometric sensor of claim 1 , wherein the sensor body comprises a bandage-style sensor body comprising one or more stiffening elements.
9 . The spectrophotometric sensor of claim 1 , comprising a gel configured to be disposed at approximately the angled cut as a light coupling medium.
10 . A monitoring system, comprising:
a monitor, comprising:
one or more light sources; and
one or more light detectors; and
a sensor, comprising:
a sensor body;
at least one light transmission fiber optically connected to the one or more light sources, the at least one light transmission fiber comprising a first angled terminal portion capable of reflecting light transmitted through the light transmission fiber toward a patient facing surface of the sensor body; and
at least one light reception fiber optically connected to the one or more light detectors, the at least one light reception fiber comprising a second angled terminal portion capable of reflecting light collected from the same or a different patient facing surface of the sensor body through the light reception fiber.
11 . The system of claim 10 , wherein the one or more light sources comprise one or more light emitting diodes.
12 . The system of claim 10 , wherein the monitor comprises a pulse oximeter.
13 . The system of claim 10 , wherein one or both of the first angled terminal portion or the second angled terminal portion comprise an angle of between about 30° and about 60°.
14 . A method of manufacturing a sensor, comprising the acts of:
cutting an optical fiber at an angle such that the optical fiber comprises an angled terminus;
removing a portion of a jacket surrounding the optical fiber proximate to the angled terminus; and
positioning the optical fiber within a sensor body such that the angled terminus will reflect light toward a patient facing surface of the sensor body or will collect light emanating from the patient facing surface.
15 . The method of claim 14 , wherein the angled terminus is cut at an angle of between about 30° and about 60°.
16 . The method of claim 14 , wherein the angled terminus is cut at an angle of about 45°.
17 . The method of claim 14 , comprising coating the angled terminus with a reflective finish.
18 . The method of claim 14 , comprising capping the angled terminus with a mirror.
19 . The method of claim 14 , comprising polishing the angled terminus.
20 . The method of claim 14 , comprising disposing a gel at approximately the angled terminus, wherein the gel is configured as a light coupling medium.