David William Van Nostrand
Pharmacy at Cedar Brk Rd, Boulder, CO
License number
Colorado 17872
Issued Date
Oct 10, 2007
Renew Date
Nov 1, 2011
Expiration Date
Oct 31, 2013
Type
Pharmacist
Address
Address
770 N Cedar Brook Rd, Boulder, CO 80304
Professional information
Temperature Estimation And Tissue Detection Of An Ultrasonic Dissector From Frequency Response Monitoring
US Patent:
2013033, Dec 12, 2013
Filed:
Mar 15, 2013
Appl. No.:
13/840267
Inventors:
DAVID J. VAN TOL - BOULDER CO, US
DAVID PRICE - PORTLAND OR, US
DAVID PRICE - PORTLAND OR, US
Assignee:
COVIDIEN LP - Mansfield MA
International Classification:
A61B 17/32
US Classification:
606169
Abstract:
An ultrasonic surgical apparatus including a first signal generator outputting a drive signal at a predetermined voltage and frequency, a first oscillating structure receiving the drive signal and oscillating at the frequency of the drive signal, and a bridge circuit, detecting the mechanical motion of the first oscillating structure and outputting a signal representative of the mechanical motion. The apparatus also includes a second oscillating structure integrally formed within a portion of the first oscillating structure, the second oscillating structure outputting an electrical signal, and a microcontroller receiving the signal output by the bridge circuit and output by the second oscillating structure, the microcontroller determining an instantaneous frequency at which the first oscillating structure is oscillating based on the received signal, comparing the electrical signal from the second oscillating structure with a known signal value and determining the temperature of the second oscillating structure based on a the comparison.
Temperature Estimation And Tissue Detection Of An Ultrasonic Dissector From Frequency Response Monitoring
US Patent:
2013033, Dec 12, 2013
Filed:
Mar 15, 2013
Appl. No.:
13/840432
Inventors:
DAVID J. VAN TOL - BOULDER CO, US
DAVID PRICE - PORTLAND OR, US
DAVID PRICE - PORTLAND OR, US
Assignee:
COVIDIEN LP - Mansfield MA
International Classification:
A61B 17/32, G01N 29/44
US Classification:
606169, 702 19
Abstract:
An ultrasonic surgical apparatus and method, the apparatus including a signal generator outputting a drive signal having a frequency, an oscillating structure, receiving the drive signal and oscillating at the frequency of the drive signal, and a bridge circuit, detecting the mechanical motion of the oscillating structure and outputting a signal representative of the mechanical motion. The ultrasonic surgical apparatus also includes a microcontroller receiving the signal output by the bridge circuit, the microcontroller determining an instantaneous frequency at which the oscillating structure is oscillating based on the received signal, and determining a frequency adjustment necessary to maintain the oscillating structure oscillating at its resonance frequency, the microcontroller further determining the quality (Q value) of the signal received from the bridge circuit and determining material type contacting the oscillating structure.
Temperature Estimation And Tissue Detection Of An Ultrasonic Dissector From Frequency Response Monitoring
US Patent:
2013033, Dec 12, 2013
Filed:
Mar 15, 2013
Appl. No.:
13/840557
Inventors:
David J. VAN TOL - Boulder CO, US
David PRICE - Portland OR, US
David PRICE - Portland OR, US
Assignee:
Covidien LP - Mansfield MA
International Classification:
A61B 17/32
US Classification:
606169, 374117
Abstract:
An ultrasonic surgical apparatus and method of use including a signal generator outputting a drive signal having a frequency, an oscillating structure, receiving the drive signal and oscillating at the frequency of the drive signal, a bridge circuit, detecting the mechanical motion of the oscillating structure and outputting a signal representative of the mechanical motion, and a microcontroller receiving the signal output by the bridge circuit, the microcontroller determining an instantaneous frequency at which the oscillating structure is oscillating based on the received signal, and comparing the instantaneous frequency to a known frequency value and estimating a temperature of the oscillating structure based on the comparison.