OCCLUSION DETECTION TECHNIQUES FOR A FLUID INFUSION DEVICE HAVING A ROTARY PUMP MECHANISM AND AN OPTICAL SENSOR
First Claim
1. A fluid pump mechanism comprising:
- a stator comprising a stator cam element having a stator cam surface; and
a rotor comprising an optically detectable feature, a reference surface, and a rotor cam element having a variable height rising from the reference surface, the rotor cam element cooperating with the stator cam element to axially displace the rotor, relative to the stator, as a function of angular position of the rotor;
wherein the optically detectable feature rotates and axially translates as a function of angular position of the rotor; and
wherein an optical detection circuit interrogates the optically detectable feature during operation of the fluid pump mechanism to determine an operating condition of the fluid pump mechanism.
1 Assignment
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Accused Products
Abstract
A fluid infusion device includes a fluid pump mechanism having a rotor and a stator. The rotor includes an optically detectable feature, a reference surface, and a cam element rising from the reference surface. The stator includes a cam element having a stator cam surface. The cam elements cooperate to axially displace the rotor as a function of angular position of the rotor, wherein the detectable feature rotates and axially translates as a function of angular position of the rotor. A biasing element provides force to urge the rotor cam element toward the stator cam element and toward the reference surface. A drive motor actuates the rotor to pump medication fluid from a fluid cartridge module to a body, via a subcutaneous conduit. An optical detection circuit interrogates the detectable feature during operation of the fluid pump mechanism to determine an operating condition of the fluid pump mechanism.
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Citations
20 Claims
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1. A fluid pump mechanism comprising:
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a stator comprising a stator cam element having a stator cam surface; and a rotor comprising an optically detectable feature, a reference surface, and a rotor cam element having a variable height rising from the reference surface, the rotor cam element cooperating with the stator cam element to axially displace the rotor, relative to the stator, as a function of angular position of the rotor; wherein the optically detectable feature rotates and axially translates as a function of angular position of the rotor; and wherein an optical detection circuit interrogates the optically detectable feature during operation of the fluid pump mechanism to determine an operating condition of the fluid pump mechanism. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A fluid infusion device for delivering a medication fluid to a body, the fluid infusion device comprising:
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a fluid pump mechanism that cooperates with a fluid cartridge module, the fluid pump mechanism comprising a rotor and a stator, the rotor comprising an optically detectable feature, a reference surface, and a rotor cam element having a variable height rising from the reference surface, the stator comprising a stator cam element having a stator cam surface, the rotor cam element cooperating with the stator cam element to axially displace the rotor, relative to the stator, as a function of angular position of the rotor, wherein the optically detectable feature rotates and axially translates as a function of angular position of the rotor; a biasing element that provides a biasing force to urge the rotor cam element toward the stator cam element and toward the reference surface; a subcutaneous conduit in fluid communication with an outlet valve of the fluid pump mechanism; a drive motor coupled to actuate the rotor of the fluid pump mechanism to pump medication fluid from the fluid cartridge module to the body, via the subcutaneous conduit; and an optical detection circuit to interrogate the optically detectable feature during operation of the fluid pump mechanism to determine an operating condition of the fluid pump mechanism. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A fluid infusion device comprising:
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a stator comprising a stator cam element having a stator cam surface; a rotor comprising an optically detectable feature, a reference surface, and a rotor cam element having a variable height rising from the reference surface, the rotor cam element cooperating with the stator cam element to axially displace the rotor, relative to the stator, as a function of angular position of the rotor; an inlet valve that opens and closes as a function of angular and axial position of the rotor; an outlet valve that opens and closes as a function of angular and axial position of the rotor; and an optical detection circuit that cooperates with the optically detectable feature, wherein the optical detection circuit interrogates the optically detectable feature to determine an operating condition of the fluid infusion device. - View Dependent Claims (18, 19, 20)
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Specification