2.1
Hand Piece
1.1
The
ULTRACISION
System
2.2
Generator and
Foot Switch
Chapter 1 - General Description
3
The U
LTRA
C
ISION
H
ARMONIC
S
CALPEL
System is indicated for incising tissue when bleeding control and minimal
thermal injury are desired. The System’s instruments can be used as an adjunct to or substitute for electrosurgery and
steel scalpels. The System operates in two power modes, variable and full.
The U
LTRACISION
H
ARMONIC
S
CALPEL
instrument blades vibrate longitudinally at 55 kilohertz. This ultrasonic
vibration at the blade enhances its cutting ability while the vibrating blade edge coagulates bleeders as tissues are
incised. Hemostasis occurs when tissue couples with the blade. This coupling causes collagen molecules within the
tissue to vibrate and become denatured, forming a coagulum.
The cutting power can be adjusted during the incision to increase or decrease coagulation and speed of cutting.
Coagulation of large bleeders can be accomplished by captive coagulation where the side of the blade is used to
compress and tamponade the vessel while a short duration of full power seals it.
Chapter 2 - Principles of Operation
The System consists of three major components, a Generator, a Hand Piece, and a Foot Switch. The Generator
produces a 55 kilohertz electric signal which is transmitted via a coaxial cable to the Hand Piece, which then
converts the electrical signal into ultrasonic, mechanical motion. A more detailed explanation follows.
The Hand Piece houses three major components that generate, amplify, and deliver ultrasonic energy to tissues.
When each component is attached to the other and tuned to 55 kilohertz, an acoustic drive train is formed. The
acoustic system or acoustic drive train consists of three components:
•
Acoustic Transducer: converts the electrical energy into motion. The transducer consists of four piezoelectric
elements held in compression between two aluminum end bells. When an AC wave form is applied to the
transducer, the ceramics expand and contract to produce longitudinal motion.
•
Acoustic Mount: attaches the acoustic drive train to the Hand Piece. The mount also provides mechanical
amplification of the longitudinal motion.
•
Instrument Blade: couples the ultrasonic energy to the tissue and amplifies motion. In a laparoscopic
configuration, the blade is elongated by means of a "Laparosonic Extension." This extension allows the
ultrasonic energy to propagate from the Hand Piece to the instrument blade with minimal loss.
The Generator consists of ten modules that drive and cool* the Hand Piece. The Generator converts the AC line
voltage to a controlled DC level. The DC level is then remodulated at the resonant frequency of the Hand Piece. The
remodulated signal is then filtered and delivered to the Hand Piece where it resonates the acoustic train. A more
detailed description follows.
•
Power Entry Filter: accepts a standard, hospital grade utility cord. It provides susceptibility filtering from the
external environment as well as suppressing electromagnetic emissions produced by the Generator that could be
conducted back through the power cord.
•
AC Fusing and Distribution Components: provide line voltage to a cooling compressor, a high voltage
transformer, and a low voltage transformer. Fusing protects these assemblies and others from overload
conditions.
•
Cooling Compressor: provides cooling air via a silicone hose to Hand Piece models HP050, HP051, HPTUV,
and H1TUV.
* Generator provides cooling to models HP050, HP051, HPTUV and H1TUV only.
