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Patellar trial and drill guide for use in knee replacement surgery

A patellar trial and drill guide for use during knee replacement surgery comprising an articular surface member and a fixation peg drill guide. The articular surface member is the exact geometry as the artificial patellar implant, and the drill guide aligns the holes for the fixation pegs of the artificial patellar implant. The patellar trial is placed on the resected patella in the desired position, a patellar clamp is used to temporary fix the patellar trial to the patella. The patella is then returned to its normal position and a trial reduction of the total knee replacement is completed. If the placement and/or size of the patellar trial is unacceptable, the patella is inverted, the patellar trial removed, and a different sized trial or new location is determined. The new patellar trial is secured to the resected patella, and another trial reduction of the total knee replacement is completed. This procedure can be repeated until the patellar trial is the correct size and in the proper location. If the placement of the patella is acceptable, the patella is inverted, the articular surface member removed, fixation peg holes are drilled using the fixation peg holes of the drill guide, and an artificial patellar implant is implanted on the patient's remaining patella.
Owner:LINEHAN TIMOTHY R

Matching current mirror

The invention discloses a matching current mirror for converting a current ratio and particularly relates to a current ratio converting current mirror for converting a reference current into an accurate fixed-fold current. The current mirror reduced current reproduction errors and ensures accurate current production. In the current mirror, the output end of an operational amplifier controls the current or voltage of a controlled circuit to change, so that a current or voltage signal generated after the change passes through a load circuit to generate a voltage value equal to that of the voltage at the positive input end of the operational amplifier at the negative input end of the operational amplifier. According to the characteristic that the voltage at the positive input end of the operational amplifier is equal to that at the negative input end of the operational amplifier, the drain voltages of two MOS tubes constituting the current mirror are clamped to be equalized so as to ensure that the drain-source voltages of the two MOS tubes constituting the current mirror are equal. The grid electrodes of the two MOS tubes constituting the current mirror are connected to ensure that the gate-source voltages of the two MOS tubes are equal. Thus, the current reproduction errors are reduced, the current is accurately reproduced, and the matching accuracy of the current mirror is improved.
Owner:曹先国
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