Technology Database  Tools CRYOINSTRUMENT BASED ON PELTIER’S EFFECT
CRYOINSTRUMENT
BASED ON PELTIER’S EFFECT
A device which provides an
adjustable cryocooling effect on the tip of the cryoprobe with 2, 5 and 20 mm
diameter of the working surface has been developed and tested. Cryocooling is
the result of Peltier’s effect in semiconductors, that makes unnecessary the
usage of any gaseous agent (CO2, N2 or freons).
 A
scientific innovation is the use of Peltier’s effect, which enables to
manufacture a solid cryoprobe without cryogenic gases. An autonomous water
system with a circulating pump ensures heat removal. Therefore this device
doesn’t need any expendables and is always ready for operation. Peltier’s
effect enables to maintain a working temperature with the great precision with a
setup step of 1° C.
A working temperature is set
within the range from 0 to minus 60° C and is maintained by the feedback signal
from the sensor on the operating face. Pressing down a pedal triggers an
operating mode; release of the pedal automatically switches on a defrosting mode
at the temperature level of + 10° C.
The parameters of the new device
compared to the parameters of a similar existing analogue are presented below.
| |
“Criot” cryodevice |
CR 4000 cryodevice, MIRA
company, USA |
|
Temperature levels, ° C |
+ 10 (1) - 60 |
- 25, - 55, - 85 |
|
Precision of the
temperature maintenance |
± 1 |
± 5 |
|
Coolant |
absent |
CO2, N2O |
|
Power consumption, Wt |
250 |
250 |
|
Cost, USD |
5000 |
17 890 |
The device is used in
ophthalmology, cardiology, dermatology, cosmetic medicine and cryopuncture as
well as in electronic industry and laboratory practice for cryotesting.
Technical tests of CRIOT have
been carried out at the special proof ground of the RF Ministry of Health &
Medical Industry.
The device was tested in
ophthalmologic and cardiologic trials. Ophthalmologic tests were performed at
the Pavlov Medical University, Pediatric Medical Academy and a number of
specialized hospitals. The device proved to be efficient for retinal
cryocoagulation, cataract extraction, treatment of keratites etc.
Cardiologic tests were performed
at the Bakulev Cardiothoracic Surgery Institute. The device was successfully
used for detection and destruction of arrhythmogenic zones during open-heart
surgery.
The surgeons have also noted such
advantages of the device as absence of congelation and the adjacent tissues
traumatizing, automatic fast defrosting after the pedal release and a precise
digital indication of current temperature on the operating face of the cryoprobe.
The technology based on
Peltier’s effect enabled to develop a family of cryostats up to - 60° C,
cryopanels and other devices.
A complete set of device service
documentation has been prepared. Four pilot devices have been manufactured and
passed medical tests. It is desirable to establish scientific and business
contacts in the field of unconventional ozone-sparing cryotechnologies. Certain
experience has been obtained in development of the family of thermoelectric desk
top cryostats up to - 45° C.
Author: Sulin Alexandr Borisovich
Publishing date: July 20, 2000
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