Minipumps, LLC

Microsemi Corporation

Zarlink Semiconductor Limited

Didier Sagan

Jacques Paris

Mark Salman Humayun

Jason Shih

William Andrew Brandt

Atoosa Lotfi

Andrew Dunn

Gregory Harbers

Andrew Urazaki

Andrew Michael Bottomley

Reghu Rajan

Steven Arroyo

Richard Purvis

Miho Matsuoka

In various embodiments, a drug pump includes a housing and, within the housing, an expandable drug reservoir at least part of which is exposed to a pressurized propellant. The propellant exerts a substantially constant pressure on the drug reservoir. A flow restrictor significantly limits outflow from the pump, and preferably has both a small diameter and a long path length, which acts to control the outflow from the drug reservoir. As a result, the pump produces a substantially constant outflow.

Implantable continuous-flow pumps

Systems and methods for maximizing the resonance frequency match between a reader and a controlled device interacting over a narrowband inductive link involve, in various embodiments, features of the controlled device, the reader, or both.

Implant telemetry with dynamic tuning

In various embodiments, a system for receiving wireless power includes a magnetic core and a plurality of layers of electrical conductors wrapped around the magnetic core. Each electrical conductor includes a first endpoint and a second endpoint; the first endpoint and the second endpoint are electrically connected to a circuit to provide power thereto, and two of the electrical conductors are electrically insulated from each other between the first endpoint and the second endpoint.

Telemetry arrangements for implantable devices

A signal acquisition circuit detects a wanted signal in a composite signal containing the wanted signal and an unwanted signal, where the highest frequency in the unwanted signal is higher than the highest frequency in the wanted signal. A sensor captures the composite signal and an analog-to-digital converter samples and converts the composite signal to digital format, and a filter subtracts the unwanted signal from the composite signal. The sampled signal contains a first component containing the sum of the wanted signal and the unwanted signal sampled at a first rate at least equal to the Nyquist rate for the wanted signal but less than a second rate that is at least equal to the Nyquist rate for the unwanted signal, and a second component containing the unwanted signal sampled at the second rate. The analog-to-digital converter outputs to the filter a first digital signal containing the first component sampled at the first rate and a second digital signal containing the second component at the second rate. The circuit is useful for detecting a photoplethysmograph signal in the presence of ambient light in a pulse oximetry sensor.

Signal acquisition circuit for detecting a wanted signal in the presence of an unwanted signal

A method and system for sampling an analog signal that minimizes perturbations caused by noise. In one embodiment, the sample and hold circuit includes a plurality of switches in series between the sampled source and a hold capacitor. A resistor is located in parallel with the first switch. The two switches are controlled so as to provide three signal paths between the hold capacitor and the sampled signal. The first signal path is a closed circuit between the charge capacitor and the sampled signal. This path occurs during a first phase of operation for the sample and hold circuit. During a second phase of operation, the first switch is opened which sends any current loss from the capacitor to path through the resistor. The high resistance provided by the resistor minimizes this current loss. The third signal path occurs when the second switch is opened which present an open circuit between the capacitor and the sampled signal. During the transition from the second phase to the third phase, any current loss due to noise passes through the resistor and thus minimizes the voltage loss across the hold capacitor. Another embodiment of the sample and hold circuit only operates between a first and a second phase.

Sample and hold circuit

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San Diego, CA, United States of America

Didier Sagan