Cryosurgery uses extreme cold to destroy diseased tissue. Liquid nitrogen is commonly used as the cryogen and applied using probes or sprayed directly onto lesions. The freezing process destroys cells through both immediate and delayed mechanisms. Cryosurgery is used to treat various skin conditions and some internal disorders. While it provides benefits like being painless and requiring no follow up care, disadvantages can include pain, swelling, and potential damage to surrounding tissue.
PRINCIPLES OF CRYOSURGERY
Cryosurgery (cryotherapy) is the application of extreme cold to destroy abnormal or diseased tissue.
The term comes from the Greek words cryo ("icy cold") and surgery meaning "hand work" or "handiwork".
Cryosurgery has been historically used to treat several diseases and disorders, especially variety of benign and malignant skin conditions.
Mechanism of cryosurgery
o The destructive effect of freezing tissue has been categorized into two major mechanisms-
Immediate cell destruction.
Delayed cell destruction.
Application techniques
Probe freezing: It is done by direct application of a probe tip to the lesion. The cryogen circulates through the probe tip and super cools it, when allowed to contact the target tissue. Probe freezing can be accomplished by one of the two mechanisms: contact freezing and penetration freezing.
In contact freezing, firm contact is made between the cryoprobe and the target tissue.
While in penetration freezing probe penetrates the target tissue, providing a large area of direct contact.
Spray freezing: It is done by direct application of the liquid nitrogen to the tissue and is the most destructive method. Liquid nitrogen is delivered to the target tissue at such a volume and velocity that it evaporates at the edge of the lesion. The spray orifice allows deeper and faster tissue penetration than the probe tip but the probe method is safer and more precise.
Benefits of Cryosurgery in Veterinary Medicine
Painless.
No Preparation.
No post op care.
No open wounds – No Bleeding.
No suturing.
No general anaesthesia – safe for older animals.
Rapid treatment time – only seconds.
Cost Effective.
Pressure to treat lesion.
Pinpoint Accuracy.
CryoProbe’s different micro applicators tips allow pinpoint accuracy to treat skin lesions from 1mm to 8mm in size.
Blue dot applicator Applications 1-3 mm.
White dot applicator Applications 2-4 mm.
Green dot applicator Applications 3-6 mm.
Yellow dot applicator Applications 4-10 mm.
Lesions
With the CryoProbe you will be able to treat (but not limited) to the following lesions successfully:
Perianal Adenomas.
Epuli.
Papilloma.
Lick Granulomas.
Warts.
Small Sarcoids.
Eye Lid Tumors.
You will be able to quickly and easily treat skin lesions that you could not treat before without undesired side effects.
Disadvantages of Cryosurgery
As with the advantages of cryosurgery, the disadvantages can also be categorized into those for the clinician and those for the patient.
Disadvantages for the clinician include the following:
Liquid nitrogen needs to be delivered and stored. A liquid nitrogen generator may be purchased. If that is not done, nitrous oxide tanks or other supplies will need to be replenished as needed.
This topic has been introduced in the new edition of Bailey & Love - 26th. This topic covers the types, uses & special uses as well as complications of Diathermy.
New modern technique nowadays used for treatment....specially for medical students....Gain knowledge as much as you can and form wherever you can..i hope you will like it
PRINCIPLES OF CRYOSURGERY
Cryosurgery (cryotherapy) is the application of extreme cold to destroy abnormal or diseased tissue.
The term comes from the Greek words cryo ("icy cold") and surgery meaning "hand work" or "handiwork".
Cryosurgery has been historically used to treat several diseases and disorders, especially variety of benign and malignant skin conditions.
Mechanism of cryosurgery
o The destructive effect of freezing tissue has been categorized into two major mechanisms-
Immediate cell destruction.
Delayed cell destruction.
Application techniques
Probe freezing: It is done by direct application of a probe tip to the lesion. The cryogen circulates through the probe tip and super cools it, when allowed to contact the target tissue. Probe freezing can be accomplished by one of the two mechanisms: contact freezing and penetration freezing.
In contact freezing, firm contact is made between the cryoprobe and the target tissue.
While in penetration freezing probe penetrates the target tissue, providing a large area of direct contact.
Spray freezing: It is done by direct application of the liquid nitrogen to the tissue and is the most destructive method. Liquid nitrogen is delivered to the target tissue at such a volume and velocity that it evaporates at the edge of the lesion. The spray orifice allows deeper and faster tissue penetration than the probe tip but the probe method is safer and more precise.
Benefits of Cryosurgery in Veterinary Medicine
Painless.
No Preparation.
No post op care.
No open wounds – No Bleeding.
No suturing.
No general anaesthesia – safe for older animals.
Rapid treatment time – only seconds.
Cost Effective.
Pressure to treat lesion.
Pinpoint Accuracy.
CryoProbe’s different micro applicators tips allow pinpoint accuracy to treat skin lesions from 1mm to 8mm in size.
Blue dot applicator Applications 1-3 mm.
White dot applicator Applications 2-4 mm.
Green dot applicator Applications 3-6 mm.
Yellow dot applicator Applications 4-10 mm.
Lesions
With the CryoProbe you will be able to treat (but not limited) to the following lesions successfully:
Perianal Adenomas.
Epuli.
Papilloma.
Lick Granulomas.
Warts.
Small Sarcoids.
Eye Lid Tumors.
You will be able to quickly and easily treat skin lesions that you could not treat before without undesired side effects.
Disadvantages of Cryosurgery
As with the advantages of cryosurgery, the disadvantages can also be categorized into those for the clinician and those for the patient.
Disadvantages for the clinician include the following:
Liquid nitrogen needs to be delivered and stored. A liquid nitrogen generator may be purchased. If that is not done, nitrous oxide tanks or other supplies will need to be replenished as needed.
This topic has been introduced in the new edition of Bailey & Love - 26th. This topic covers the types, uses & special uses as well as complications of Diathermy.
New modern technique nowadays used for treatment....specially for medical students....Gain knowledge as much as you can and form wherever you can..i hope you will like it
Lasers in oral & maxillofacial surgery/oral surgery courses by indian dental ...Indian dental academy
Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
Cryotherapy is a controlled and targeted destruction of diseased tissue by the application of cold temperature substance.
Used for treatment of diverse benign lesions and well corcumscribed pre malignant and malignant tumours
Cryonics In Nanotechnology Raising From Deathmanyamkusuma
The most important application of nanotechnology is cryonics.
Cryonics – derived from the Greek language, kryos meaning icy cold. Cryonics is the low-temperature preservation of living things who/which can no longer be sustained by contemporary medicine, with the hope that healing and resuscitation may be possible in the future. Preserving to the point where molecular physical decay completely stops this state is known as cryonics suspension. The idea of cryonics was proposed by Robert Ettinger a Physics teacher after he read a book The Jameson Satellite by Neil R Jones in the year 1931. Later he published the books so called, The penultimate Triumph and The Prospects of Immortality in the years 1948 and 1962 respectively, which is a modern era of cryonics.
Robert Ettinger - ‘ originator and pioneer of cryonics’.
The word cryonics was proposed by Kerl Werner in 1965.
Later it was developed by CSM, CSC(not in use know),
CI, Alcor. In medicine, cryonics was once considered on the outer edge but is now moving closer to reality which means someone who died and was frozen last week may have a future again. Cryonics and nanotechnology form a useful pair.
Cryonics can transport a terminally ill patient to future medical technology.
cryogenics is the production and behaviour of materials at very low temperatures. It is an effort to save lives by using temperatures so cold that a person beyond help by today's medicine can be preserved for decades or centuries until a future medical technology can restore that person to full health. Cryonics sounds like science fiction, but is based on modern science.
The next is cooling of infrared detectors or telescopes or cold probes are some of the major
applications of cryogenics. I have to use infrared detector in space because when I am
taking night surveillance, when I taking picture, I have got infrared detectors. Now, in
order to get a good signal to noise ratio; that means, in order to get a good
Cryotechniques and their methods.
1.cryotomy and What is cryopreservation.
2.cryopreservation of cells, tissue, and organisms.
3.freeze fracture
4.freeze drying.
5.freezable tissues.
6.mechanism of cryopreservation.
7.cryopreservation of embryos.
for more such content reffer to www.faunafondness.com
Cryotherapy, sometimes known as cold therapy, is the local or general use of low temperatures in medical therapy. Cryotherapy may be used to treat a variety of tissue lesions. The most prominent use of the term refers to the surgical treatment, specifically known as cryosurgery or cryoablation.
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
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This is a presentation by Dada Robert in a Your Skill Boost masterclass organised by the Excellence Foundation for South Sudan (EFSS) on Saturday, the 25th and Sunday, the 26th of May 2024.
He discussed the concept of quality improvement, emphasizing its applicability to various aspects of life, including personal, project, and program improvements. He defined quality as doing the right thing at the right time in the right way to achieve the best possible results and discussed the concept of the "gap" between what we know and what we do, and how this gap represents the areas we need to improve. He explained the scientific approach to quality improvement, which involves systematic performance analysis, testing and learning, and implementing change ideas. He also highlighted the importance of client focus and a team approach to quality improvement.
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
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The map views are useful for providing a geographical representation of data. They allow users to visualize and analyze the data in a more intuitive manner.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
2. Cryosurgery (cryotherapy) is the
application of extreme cold to destroy abnormal or
diseased tissue.
The term comes from the Greek words cryo
("icy cold") and surgery meaning "hand work" or
"handiwork".
Cryosurgery has been historically used to treat a
number of diseases and disorders, especially
variety of benign and malignant skin conditions.
3. HISTORY OF CRYOSURGERY
James Arnott, in 19th century, stated that a very
low temperature will arrest every inflammation
which is near enough to the surface.
The first cryogens were liquid air and
compressed carbon dioxide snow.
In 1961, Cooper and Lee developed the first
cryotherapy probe system, involving the
circulation of liquid nitrogen through a closed
metal tube placed in direct contact with the
target tissue.
5. Liquid nitrogen
Cryogun used to spray liquid nitrogen
A common method of freezing lesions is using liquid nitrogen as the
cooling solution. The super-cooled liquid may be sprayed on the
diseased tissue, circulated through a tube called a cryoprobe, or
simply dabbed on with a cotton or foam swab.
Carbon dioxide
Less frequently, doctors use carbon dioxide"snow" formed into a
cylinder or mixed with acetone to form a slush that is applied directly
to the treated tissue.
Argon
Recent advances in technology have allowed for the use of argon gas
to drive ice formation using a principle known as the Joule-Thomson
effect. This gives physicians excellent control of the ice, and
minimizing complications using ultra-thin 17 gauge cryoneedles.
Dimethyl ether – propane
A mixture of dimethyl ether and propane is used in some preparations
such as Dr. Scholl's Freeze Away. The mixture is stored in an aerosol
spray type container at room temperature and drops to −41 °C when
dispensed. The mixture is often dispensed into a straw with a cotton-
tipped swab.
6. Mechanism of cryosurgery
o The destructive effect of freezing tissue has been categorized
into two major mechanisms
Immediate cell destruction
Delayed cell destruction
7.
8. Application techniques
Probe freezing: It is done by direct application of a probe tip
to the lesion. The cryogen circulates through the probe tip and
super cools it, when allowed to contact the target tissue. Probe
freezing can be accomplished by one of the two mechanisms:
contact freezing and penetration freezing.
In contact freezing, firm contact is made between the
cryoprobe and the target tissue.
While in penetration freezing probe penetrates the target
tissue, providing a large area of direct contact.
Spray freezing: It is done by direct application of the liquid
nitrogen to the tissue and is the most destructive method.
Liquid nitrogen is delivered to the target tissue at such a
volume and velocity that it evaporates at the edge of the
lesion. The spray orifice allows deeper and faster tissue
penetration than the probe tip but the probe method is safer
and more precise.
10. Cooling rate
• In cryosurgery, rapid cooling rate i.e. more than 500C/min
produces intracellular ice- crystals which is more destructive
• Such higher rates of cooling can only be achieved close to
the cryoprobe
Temperature
• Mazur stated that the lethal temperature range is between -
50C to -500C.
• The treatment of tumor requires a tissue temperature at which
all the abnormal cells are certainly dead.
11. From the review of all experimental studies the end point
temperature below -40 0C has been considered prime factor
for tissue destruction
12. Thawing rate
• Thawing rate should be slow and continued for longer time
period; rapid thaw rates allow cell survival.
Repetitive freeze- thaw cycle
• Rapid freezing and slow thawing do not guarantee effective cell
destruction.
• Use of repeated freeze-thaw cycle is also beneficial in treatment
of cancerous tumor
13.
14. Bio-heat Equation
o Several heat transfer mechanisms occur during
cryosurgery, including conduction, convection, metabolism
and phase change.
o Heat transfer by conduction has been assumed to be the
primary heat transfer process during cryosurgery since the
cryoprobe operates at an extremely low temperature.
o Bio-heat transfer is the study of heat transfer in biological
system.
o The fundamental heat transfer equation in biological tissue
was firstly suggested by Pennes.
15. Pennes suggested that the rate of heat transfer between blood and tissue is
proportional to the product of the volumetric perfusion rate and the
difference between the arterial blood temperature and the local tissue
temperature. He expressed that relationship as follows
Where,
hb is the rate of heat transfer per unit volume of tissue,
V is the perfusion rate per unit volume of tissue,
ρb is the density of blood,
cb is the specific heat of blood,
K is a factor that accounts for incomplete thermal equilibrium between
blood and tissue
(0<K<1, for some cases K = 0)
Ta is the temperature of arterial blood, and
T is the local tissue temperature
16. Procedure
o Warts, moles, skin tags, solar keratoses, and small skin
cancers are candidates for cryosurgical treatment.
o Several internal disorders are also treated with cryosurgery,
including liver cancer, prostate cancer, cervical disorders
and, more commonly in the past, hemorrhoids.
o Cryosurgery works by taking advantage of the destructive
force of freezing temperatures on cells. At low
temperatures, ice crystals form inside the cells, which can
tear them apart. More damage occurs when blood
vessels supplying the diseased tissue freeze
17. • The application of liquefied N₂0
sprayed directly on the skin will
bring temperature fully under
control (nitrous oxide always
evaporates at (-)127⁰
• Sophisticated micro-applicator
technology enables an
unprecedented level of accuracy of
treatment from 1mm. The
prevention of trauma to surrounding
tissue will assure patient’s comfort
• The pressure of the spray at 721 psi
will give maximum control over
depth of freezing and will guarantee
the results of the treatment.
18. Why Pressure
• The penetration of the ice crystal into the lesion as a result of cryosurgery
with the CryoProbe will go faster and deeper with minimal surface trauma.
• The freezing rate of CryoProbe is 1mm
per 5 seconds
• Depth of treatment: the CryoProbe freezes up to a maximum 5 mm cell
structure
19. o In this approach, several hollow
probes (needles) are placed in direct
contact with target tissue.
o The doctor guides them into the
gland(tumor) using Trans-Rectal
Ultra-Sound (TRUS).
o This type of procedure requires spinal or
epidural anesthesia (where the lower
half of your body is numbed) or general
anesthesia.
20. Very cold gases are then passed through the needles,
creating ice balls that destroy the gland(tumor).
21. o After the procedure, there will be some bruising and soreness
in the area where the probes were inserted. Patients might need
to stay in the hospital overnight, but many patients leave the
same day.
o The most common method of freezing lesions is using liquid
nitrogen as the cooling solution. The super-cooled liquid may be
sprayed on the diseased tissue, circulated through a tube called a
cryoprobe.
22.
23. Benefits of Cyrosurgery in Veterinary Medicine
Painless
No Preparation
No post op care
No open wounds – No Bleeding
No suturing
No general anthesia – safe for older animals
Rapid treatment time – only seconds
Cost Effective
Pressure to treat lesion
Pinpoint Accuracy
25. Cryogun used to spray
liquid nitrogen
Manufacturers have devised various metal
attachments to serve as heat-conducting
probes for cryotherapy. Copper, because
of its high conductivity, is typically used
26. CryoProbe’s different micro applicators
tips allow pinpoint accuracy to treat skin
lesions from 1mm to 8mm in size!
Blue dot applicator
Applications 1-3 mm
White dot applicator
Applications 2-4 mm
Green dot applicator
Applications 3-6 mm
Yellow dot applicator
Applications 4-10 mm
27. Lesions
With the CryoProbe you will be able to treat (but not limited) to the
following lesions successfully:
• Perianal Adenomas
• Epuli
• Pappilomas
• Lick Granulomas
• Warts
• Small Sarcoids
• Eye Lid Tumors
You will be able to quickly and easily treat skin lesions that you could not
treat before without undesired side effects!
41. Cryotherapy was chosen as the treatment for Nat because it causes little
discomfort
requires no preparation and no follow up care.
Since the CryoProbe has a penetration rate of freezing into the tissue @
1mm per 5 seconds, a 20-30 second treatment is performed on the lesion
that is estimated to be 3 to 4mm deep.
45. Although not required Nat came back after treatment for a check up at 5
weeks. A very nice result was achieved with the easy and practical
CryoProbe treatment modality
46. Disadvantages of Cryosurgery
As with the advantages of cryosurgery, the disadvantages can also be categorized
into those for the clinician and those for the patient.
Disadvantages for the clinician include the following:
Liquid nitrogen needs to be delivered and stored. A liquid nitrogen generator
may be purchased. If that is not done, nitrous oxide tanks or other supplies will
need to be replenished as needed.
The clinician must be certain of the diagnosis because no tissue will be sent for
pathology.
Cryosurgery is not as accurate as a scalpel or laser in cosmetic work.
Disadvantages for the patient include:
Erythema and swelling are the norm. Blistering is common.
Pain, especially throbbing pain around the nail folds.
Pain with walking if plantar warts are treated.
May require multiple visits.
Hypopigmentation.
Damage to adjacent structures such as joints and bones may lead to lameness
and fracture.
Risk of uncontrolled freezing - resulting in destruction of normal tissue.