| Patent Number |
Title Of Patent |
Date Issued |
| 5868742 |
Auxiliary reference electrode and potential referencing technique for endoscopic electrosurgical |
February 9, 1999 |
| 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 |
| 4967159 |
Self-balancing reflectometer |
October 30, 1990 |
| 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 sa |
| 4848335 |
Return electrode contact monitor |
July 18, 1989 |
| 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 |
| 4825168 |
Remote conductivity sensor using square wave excitation |
April 25, 1989 |
| 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 |
| 4617927 |
Electrosurgical unit |
October 21, 1986 |
| 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 |
| 4574801 |
Electrosurgical unit with regulated output |
March 11, 1986 |
| 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 t |
| 4569345 |
High output electrosurgical unit |
February 11, 1986 |
| 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 |
| 4548198 |
Automatic tourniquet |
October 22, 1985 |
| A pneumatic tourniquet which automatically adjusts the pressure in the tourniquet cuff and in which the pressure adjustment is variable and depends on the sign and magnitude of the pressure error. There is an inflatable cuff, a motor and pump for inflating the cuff, a valve for defla |
| 4520820 |
Automatic tourniquet with improved pressure resolution |
June 4, 1985 |
| 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 th |
| 4520819 |
Tourniquet with differential pressure occlusion detector |
June 4, 1985 |
| An automatic tourniquet with an improved occlusion detector. A pump and valve for inflating and deflating a tourniquet cuff are connected to a first port. A pressure transducer for sensing the pressure in the cuff is connected to a second port. A pair of pressure differential switches, |
