OPTICAL DETECTION OF MEDICAL PUMP ROTOR POSITION
First Claim
1. A medical pumping apparatus comprising:
- a pump rotor including a surface having a reflective portion for reflecting electromagnetic radiation and a non-reflective portion that does not reflect electromagnetic radiation;
a motor for rotating the pump rotor;
an emitter for emitting electromagnetic radiation, said emitter positioned to emit electromagnetic radiation sequentially on the reflective and non-reflective portions of the surface of the pump rotor as the pump rotor rotates; and
a detector for receiving electromagnetic radiation reflected by the surface of the pump rotor and providing a detection signal indicative of the received electromagnetic radiation for monitoring rotation of the pump rotor.
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0 Petitions
Accused Products
Abstract
Rotation of a rotatalbe assembly of a medical pumping apparatus such as a pump rotor of a rotary peristaltic pump is monitored via electromagnetic radiation (e.g., infrared radiation). The rotatable assembly is formed such that it has portions that are reflective and non-reflective with respect to the electromagnetic radiation. A electromagnetic radiation emitter-detector pair is positioned such that as the rotatable assembly rotates, the reflective and non-reflective portions alternately pass through the electromagnetic radiation emitted by the emitter. The detector receives electromagnetic radiation reflected by the reflective portions, but the non-reflective portions abosorb or disperse the radiation such that it is not received by the detector. An output circuit provides a signal indicating the position of the rotatable assembly as a function of the electromagnetic radiation received by the detector.
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Citations
27 Claims
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1. A medical pumping apparatus comprising:
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a pump rotor including a surface having a reflective portion for reflecting electromagnetic radiation and a non-reflective portion that does not reflect electromagnetic radiation; a motor for rotating the pump rotor; an emitter for emitting electromagnetic radiation, said emitter positioned to emit electromagnetic radiation sequentially on the reflective and non-reflective portions of the surface of the pump rotor as the pump rotor rotates; and a detector for receiving electromagnetic radiation reflected by the surface of the pump rotor and providing a detection signal indicative of the received electromagnetic radiation for monitoring rotation of the pump rotor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A pump rotor for a medical pumping apparatus, said medical pumping apparatus having a motor, an emitter, and a detector, said pump rotor comprising:
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a receiver constructed and arranged for engaging a motor shaft, said motor shaft defining an axis of rotation and supporting the pump rotor when engaged by the receiver; a surface transverse to the axis of rotation, said surface comprising a reflective portion for reflecting electromagnetic radiation and a non-reflective portion that does not reflect electromagnetic radiation; wherein; the motor rotates the pump rotor via the shaft; the emitter emits electromagnetic radiation onto the surface of the pump rotor, said emitter being positioned to sequentially emit electromagnetic radiation on the reflective and non-reflective portions of the surface of the pump rotor as the pump rotor rotates about the axis of rotation; and the detector is positioned to receive electromagnetic radiation reflected by the surface of the pump rotor. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method of detecting rotation of a rotatable assembly in a medical pumping apparatus comprising:
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providing a surface on the rotatable assembly having a reflective portion for reflecting electromagnetic radiation and a non-reflective portion that does not reflect electromagnetic radiation; emitting electromagnetic radiation onto the surface of the rotatable assembly such that as the rotatable assembly rotates, the reflective portion and the non-reflective portion of the surface of the rotatable assembly sequentially pass through the electromagnetic radiation emitted by the emitter; receiving electromagnetic radiation reflected by the surface of the rotatable assembly at a detector of the medical pumping apparatus; and providing a detection signal in response to receiving electromagnetic radiation reflected by the surface of the rotatable assembly at the detector. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A medical pumping apparatus comprising:
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a pumping mechanism including a disk having a surface with a reflective portion for reflecting electromagnetic radiation and a non-reflective portion that does not reflect electromagnetic radiation; a motor for rotating the pumping mechanism; an emitter for emitting electromagnetic radiation, said emitter positioned to emit electromagnetic radiation sequentially on the reflective and non-reflective portions of the surface of the disk as the pumping mechanism rotates; and a detector for receiving electromagnetic radiation reflected by the surface of the disk and providing a detection signal indicative of the received electromagnetic radiation for monitoring rotation of the pumping mechanism. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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Specification