Apparatus and method for alerting generator functions in an ultrasonic surgical system

Abstract

The present invention provides a system for surgery which includes an ultrasonic hand piece having a end-effector, a console having a digital signal processor (DSP) for controlling the hand piece, and a memory disposed in the end-effector. The generator console sends a drive current to drive the hand piece which imparts ultrasonic longitudinal movement to the blade. As the generator console reads the memory, the hand piece is authenticated for use with the generator console if a copyrighted data string is present in the memory. In a particular embodiment, the data string is an encrypted code, where the hand piece is authenticated for use with the console by decoding a corresponding encryption algorithm resident in the generator console and providing a responding data pattern.

Description

RELATED APPLICATIONS[0001]The present invention is a continuation of and claims priority to U.S. patent application Ser. No. 09 / 975,127, filed Oct. 10, 2001, which claims priority to U.S. Provisional Patent Application Ser. No. 60 / 241,886 filed on Oct. 20, 2000 and entitled “BLADE IDENTIFICATION IN AN ULTRASONIC SURGICAL HANDPIECE”.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention generally relates to an apparatus and method for alerting generator functions in an ultrasonic surgical system and more particularly, to an ultrasonic surgical system for providing information to a generator from an ultrasonic surgical instrument.[0004]2. Description of the Related Art[0005]It is known that electric scalpels and lasers can be used as a surgical instrument to perform the dual function of simultaneously effecting the incision and hemostatis of soft tissue by cauterizing tissues and blood vessels. However, such instruments employ very high temperatures to a...

AI Technical Summary

Benefits of technology

[0015]Moreover, to prevent errors in operating the hand piece or blade or shears, the memory can store certain diagnostic information which the generator console can utilize in determining whether the operation of the hand piece should be handicapped or disabled or alert an end user without handicap- or disable-mode operations. For instance, the memory can store information such as limits on the time that the hand piece is active, the number of activations within a time period, the number of defective blades used, operating temperature, maximum allowable rate of change in temperature, and other limits. Those limits stored in the memory can be re-initialized accordingly based on various operational conditions of the hand piece.

[0016]The memory can also be used to reprogram or upgrade the generator console, if needed. For example, new hand pieces are issued periodically as new system functionality is achieved. When such a new hand piece is connected, the system perform diagnostic tests to determine whether a reprogram or upgrade of the generator console is needed. If it is determined that a reprogram or upgrade is needed, the generator console reads the memory located in the sheath of the end-effector of the hand piece where a reprogram or upgrade code is stored. Using the reprogram or upgrade code read from the memory, the generator console is reprogrammed or upgraded accordingly. Therefore, the generator consoles in the field can be upgraded automatically without having to return them to the manufacturer or to send a service technician to the generator console. Alternately, rather than reprogramming the generator memory, the blade / shear memory data is utilized by the generator console as the basis for operation parameters for the particular blade / shear in use. Default parameters are reverted to in operating the hand piece when particular parameters are not present in subsequent blades / shears attached to handpiece.

Problems solved by technology

However, such instruments employ very high temperatures to achieve coagulation, causing vaporization and fumes as well as splattering.

Additionally, the use of such instruments often results in relatively wide zones of thermal tissue damage.

One of the problems associated with such ultrasonic cutting instruments is uncontrolled or undamped vibrations and the heat as well as material fatigue resulting therefrom.

However, this could result in insufficient power to the blade at a time when it is needed for the most effective treatment of the patient.

In response to a switch on the hand piece or a foot switch connected to the generator by another cable, the generator signal is applied to the transducer, which causes a longitudinal vibration of its elements.

This arrangement is inflexible since the power versus load characteristics of the output of such a system can not be optimized to various types of hand piece transducers and ultrasonic blades.

The performance of traditional analog ultrasonic power systems for surgical instruments is affected by the component tolerances and their variability in the generator electronics due to changes in operating temperature.

However, these traditional ultrasonic drive systems have little to no flexibility with regards to adaptive frequency control.

The prior art ultrasonic generator systems also have little flexibility with regard to amplitude control, which would allow the system to employ adaptive control algorithms and decision making.

For example, these fixed systems lack the ability to make heuristic decisions with regards to the output drive, e.g., current or frequency, based on the load on the blade and / or the current to voltage phase angle.

Further, the lack of control over amplitude and frequency control reduces the system's ability to perform diagnostic tests on the transducer / blade system and to support troubleshooting in general.

However, the prior art systems do not provide for authentication of the use of the hand piece with the generator console.

Furthermore, conducting diagnostic and performance tests in the prior art systems is cumbersome.

Reprogramming or upgrading of the console in the prior art systems is also burdensome, since each console needs to be independently tested and upgraded.

In addition, the prior art system do not allow operation of the console with varied driving current and output displacement, depending on the type and output ability of hand piece in operation with the console.

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