Michael R Manes

US Patent:

45748012, Mar 11, 1986

Filed:

Feb 29, 1984

Appl. No.:

6/584954

Inventors:

Michael R. Manes - Littleton CO

Assignee:

Aspen Laboratories, Inc. - Englewood CO

International Classification:

A61B 1739

US Classification:

12830314

Abstract:

An electrosurgical unit having feedforward power regulation. In one embodiment there is an amplifier which produces a pulse modulated electrosurgical output signal. A microprocessor calculates an adjusted pulse width (duty cycle) just sufficient to account for the power changes due to voltage fluctuations. The microprocessor controls the pulse width of the gate voltage of a power transistor in the amplifier to regulate the amplifier output. In another embodiment the supply voltage is fed into the base drive circuitry of an amplifier power transistor through the photo-resistor side of an optoisolator. The lamp brightness of the optoisolator and thus the gain of the base drive circuitry is adjusted by the amplifier power level control. The nonlinearity of the optoisolator complements the nonlinearity of the amplifier so that the net gain in the amplifier drive at any power setting is just sufficient to account for the voltage fluctuation.

US Patent:

48251682, Apr 25, 1989

Filed:

May 30, 1986

Appl. No.:

6/869087

Inventors:

Francis T. Ogawa - Lakewood CO
George J. Eilers - Evergreen CO
Michael R. Manes - Littleton CO
Donn D. Lobdell - Englewood CO
Terry D. Boucher - Littleton CO

Assignee:

Cobe Laboratories, Inc. - Lakewood CO

International Classification:

G01N 2706
G01N 2708
G01N 2772

US Classification:

324439

Abstract:

A liquid conductivity sensor which features simply and inexpensively driving the excitation transformer of a two-transformer/fluid-loop remote conductivity sensor with a square wave excitation signal provided by a digital timer and a flip-flop. Also disclosed is using an electrodeless conductivity sensor to sense conductivity of dialysate.

US Patent:

48483354, Jul 18, 1989

Filed:

Feb 16, 1988

Appl. No.:

7/156540

Inventors:

Michael R. Manes - Littleton CO

Assignee:

Aspen Laboratories, Inc. - Greenwood Village CO

International Classification:

A61B 1739

US Classification:

12830313

Abstract:

Apparatus for monitoring the resistance of the return part of the patient circuit of either a dual foil or single foil return electrode according to a user's selection is disclosed. The apparatus measures the quality of the contact between the return electrode and the patient. A DC or AC converter provides a substantially DC voltage at its input that varies in relation to the resistance of the return part of the patient circuit at its AC output. Preferably, a constant current fed sinusoidal oscillator with a low pass filter at its DC output provides a substantially DC voltage related to the resistance at its AC input. An analog to digital converter converts the substantially DC voltage to a corresponding binary digital signal that is input to a programmed microprocessor. A manually operable set point switch coupled to the microprocessor is acatuated by the user which actuation establishes a resistance level with the pad (return electrode) in place on the patient. The microprocessor establishes preselected range between fixed maximum and minimum resistance values beyond which an alarm output is produced and establishes a threshold resistance value whereby upon a preselected fixed deviation, such as when the patient pad is partially detached, an alarm is produced and further an output so the RF power source will longer apply power to the active electrode.

US Patent:

45693455, Feb 11, 1986

Filed:

Feb 29, 1984

Appl. No.:

6/584956

Inventors:

Michael R. Manes - Littleton CO

Assignee:

Aspen Laboratories, Inc. - Englewood CO

International Classification:

A61B 1739

US Classification:

12830314

Abstract:

An electrosurgical unit including voltage control circuitry which operates to limit the voltage at the electrosurgical electrodes when the unit is not in coagulation mode. The electrosurgical unit includes sensing circuitry for providing a signal representative of the voltage at the electrosurgical electrodes, a mode setting switch or dial for changing between a cut mode setting and a coagulation mode setting, a circuit for producing a mode signal, and an RF power generator responsive to the mode setting switch for providing a cut mode waveform at the electrode outputs when the mode setting switch is in cut mode and a coagulation mode waveform when the mode setting switch is in the coagulation mode setting. A voltage limiting circuit is responsive to the signal from the sensing circuitry and limits the voltage at the outputs when the electrosurgical unit in cut mode. Suppression circuitry responsive to the mode signal prevents the voltage limiting circuitry from operating in coagulation mode.

US Patent:

58687424, Feb 9, 1999

Filed:

Oct 18, 1995

Appl. No.:

8/544735

Inventors:

Michael R. Manes - Littleton CO
John Gentelia - Madison NY

Assignee:

Conmed Corporation - Utica NY

International Classification:

A61B 1736

US Classification:

606 46

Abstract:

Non-insulated surgical instruments are referenced to the electrical potential of a patient during minimally invasive electrosurgery to prevent unintentional patient burns, should the surgical instruments become accidentally energized during the electrosurgical procedure. An auxiliary safety electrode separate from the primary return electrode is attached to the patient at a location separate from the attachment point of the primary return electrode. Each non-insulated surgical instrument is preferably attached to the auxiliary electrode by a separate electrical conductor. The electrical conductor transfers to the auxiliary electrode any electrical energy which is accidentally applied to the instrument during the course of the electrosurgical procedure. The size of the auxiliary electrode is sufficient to safely disperse the electrical charge without burning the patient. When used with conductive cannulas, the electrical conductor is attached between the metal cannula and the auxiliary electrode to dissipate any electrical energy unintentionally transferred to the metal cannula.

US Patent:

45208204, Jun 4, 1985

Filed:

Apr 15, 1983

Appl. No.:

6/485548

Inventors:

Dwight W. Kitchin - Littleton CO
Michael R. Manes - Littleton CO

Assignee:

Aspen Laboratories, Inc. - Englewood CO

International Classification:

A61B 1712

US Classification:

128327

Abstract:

An automatic tourniquet including a mechanism for inflating and deflating a cuff, a pressure sensing mechanism, and a mechanism for displaying the pressure. The pressure sensing mechanism includes a pressure transducer producing a pair of digital signals, and a mechanism for adjusting the signals so that the pressures at which the transitions between the digital quanta occur for one signal are different from the pressures at which the transitions occur for the other signal. The mechanism for adjusting includes a mechanism for setting the signals to be equal at a selected pressure, and a mechanism for offsetting the signals from each other by a voltage corresponding to one-half a digital quantum. The offset signals are summed by a microprocessor to produce a display with twice the resolution of the individual signals.

US Patent:

49671596, Oct 30, 1990

Filed:

Feb 23, 1989

Appl. No.:

7/315371

Inventors:

Michael R. Manes - Littleton CO

Assignee:

Abbott Laboratories - Abbott Park IL

International Classification:

H04B 104
H03H 740

US Classification:

324650

Abstract:

A preferred embodiment of a self-balancing reflectometer is disclosed in conjunction with a system including an RF source, an RF load, and an RF transmission channel that carries RF signals transmitted by the source to the load. The self-balancing reflectometer includes a load current sampler that generates a first sample signal related to load current by a first fixed value of gain and a load voltage sampler that generates a second sample signal related to load voltage by a voltage-responsive second variable value of gain. The first sample signal is subtracted from the second sample signal and the resulting difference signal is applied to the RF port of a double balanced mixer. The RF voltage signal appearing at the load is applied to the LO port of the mixer, which generates an IF signal that varies with both rapid load impedance modulation corresponding to load data and long term basal variations in load impedance unrelated to load data. A high gain amplifier generates output data signals corresponding to the load data and an integrator generates a gain adjustment voltage which varies with the long term variations. The gain adjustment voltage is applied to the load voltage sampler to vary the second variable value of gain in a manner to drive the difference signal to zero, thus automatically balancing the reflectometer.

US Patent:

46179275, Oct 21, 1986

Filed:

Feb 29, 1984

Appl. No.:

6/584959

Inventors:

Michael R. Manes - Littleton CO

Assignee:

Aspen Laboratories, Inc. - Englewood CO

International Classification:

A61B 1739

US Classification:

12830314

Abstract:

An electrosurgical unit having a power source, and an amplifier which includes a bipolar transistor and a FET in series with the amplifier load. In cut and blend modes, the power output of the unit is controlled by a variable voltage applied to the base terminal of the bipolar transistor. In coagulation, fulgration, and bipolar modes the power output is controlled by a variable duty cycle voltage applied to the gate terminal of the FET.