THE HARMONIC scalpel is a new device that has been introduced to surgery during the last decade. It is a device that uses high-frequency
mechanical energy to cut and coagulate tissues at the same time
. Laparoscopists were the first ones to use this method widely.
What are the advantages of the Harmonic scalpel?
Its main advantages include
precise dissection, reliable hemostasis, less lateral thermal spread
and charring mainly works by applying pressure and then sealing with a denatured protein coagulum while applying ultrasonic vibration to denature hydrogen bonds perform vessel coagulation [2].
How do harmonic scalpels work?
A harmonic scalpel
cuts via vibration
. The scalpel surface itself cuts through tissue by vibrating in the range of 55,500 Hz. The high frequency vibration of tissue molecules generates stress and friction in tissue, which generates heat and causes protein denaturation.
What is the difference between LigaSure and Harmonic scalpel?
In contrast, the Harmonic scalpel uses ultrasound technology to denature proteins in vessel walls and tissues up to 5mm thick leading to coagulation [16]. Unlike the LigaSure,
the Harmonic scalpel is also able to cut through tissue as it coagulates
.
What is harmonic in laparoscopy?
The harmonic scalpel is
a surgical instrument used to simultaneously cut and cauterize tissue
. It is the latest device to have been introduced in the last decade or so. Ultrasonic energy is famously used in the Harmonic scalpel where ultrasonic energy is converted to mechanical energy at the active blade.
What is 3rd and 5th harmonics?
Harmonics are voltages or currents that operate at a frequency that is an integer (whole-number) multiple of the fundamental frequency. So given a 50Hz fundamental waveform, this means a 2nd harmonic frequency would be 100Hz (2 x 50Hz),
a 3rd harmonic would be 150Hz (3 x 50Hz), a 5th at 250Hz
, a 7th at 350Hz and so on.
How does a harmonic work?
When a string is only lightly pressed by one finger (that is, isolating overtones of the open string), the resulting harmonics are called natural harmonics. … This technique, like natural harmonics, works
by canceling out the fundamental tone and one or more partial tones by deadening their modes of vibration
.
What are the causes of harmonics?
What Causes Harmonics? Harmonics are created by
electronic equipment with nonlinear loads drawing in current in abrupt short pulses
. The short pulses cause distorted current waveforms, which in turn cause harmonic currents to flow back into other parts of the power system.
What type of energy does LigaSure use?
LigaSure vessel sealing technology works by applying a precise amount of
bipolar energy
and pressure to fuse the collagen and elastin in the vessel walls. It effectively seals vessels 1 to 7 mm in diameter with minimal sticking, charring, or thermal spread.
How much is harmonic scalpel?
| Study Intervention/comparator Primary analysis | Procedure costs (2016 USD) | Frazzetta et al18 UltraCision Harmonic Scalpel $1,517.18 | Ligatures and cauterization $2,059.93 | Hallgrimsson et al19 UltraCision Harmonic Scalpel $2,558.56 |
|---|
How much does a LigaSure cost?
At a retail price of
$925
, the LigaSure Advance is expensive relative to its competitors.
Is Harmonic bipolar?
Harmonic scalpel uses ultrasound technology to coagulate and to cut tissues. Small Jaw device uses
bipolar electrical energy
and pressure to form a seal and a micro blade to divide the sealed tissues.
What is Harmonic Ace?
HARMONIC ACE+ Shears can be used for
coagulation and transection of vessels up
to 5 mm and handle multiple surgical jobs with precision including dissection, sealing, transection, and otomy creation. The refined blade design includes a tapered tip with a proprietary, nonstick coating.
What is harmonic focus?
Aim: Harmonic Focus (HF) is
an ultrasonic device developed most recently for thyroid surgery
. … Results: When compared to conventional haemostasis, a reduction was observed in the duration of surgery in the HF group, and the amount of blood loss was reduced by 29%, and 46%, respectively.
What are laparoscopic instruments?
- Laparoscope. Surgical scopes are one of the oldest instruments used by medical practitioners since ancient times. …
- Needle Driver. …
- Trocar. …
- Bowel Grasper. …
- Surgical Mesh.
How does ultrasonic scalpel work?
The active blade of an ultrasonic scalpel vibrates 55,500 times per second,
producing frictional heat in contact with the tissues
. As a result of this frictional heat, the protein in the tissues is denatured into an adhesive material called coagulum to seal the vessel.
