Related Experiment Video
Updated: Aug 7, 2026
09:38
Procedure for Decellularization of Rat Livers in an Oscillating-pressure Perfusion Device
Published on: August 10, 2015
10.6K
Anesthesia-related Ramifications of Benjamin Franklin's Ether-based Refrigeration
1Boston Medical Library, Boston, MA 02115.
Journal of Anesthesia History
|June 29, 2020
Summary
Benjamin Franklin used diethyl ether evaporation to freeze water in 1758. Modern refrigeration, building on this, provides medical gases and cryogenics for advanced medical applications.
Area of Science:
- Thermodynamics
- Chemical Engineering
- Medical Physics
Background:
- The principle of evaporative cooling was demonstrated in 1758 by Benjamin Franklin using diethyl ether.
- Diethyl ether served as an early coolant in mechanical refrigeration and ice-making technologies.
Observation:
- Early experiments demonstrated that the rapid evaporation of diethyl ether could induce freezing.
- This foundational observation paved the way for the development of mechanical refrigeration.
Findings:
- Advances in refrigeration technology, pioneered by individuals like Carl von Linde, enabled the separation of air into its constituent gases.
- Cryogenic applications have been developed, including liquid nitrogen for cryopreservation and cryoablation, and xenon for anesthesia.
Implications:
- Refrigeration technology is crucial for modern medicine, providing essential gases like medical oxygen.
- Cryogenic liquids such as liquid nitrogen and helium have transformative applications in medical imaging (MRI) and tissue preservation.
Related Concept Videos
01:12Local Anesthetics: Adverse Effects
While local anesthetics are generally safe and well-tolerated, they can occasionally cause adverse effects that vary in severity. Local anesthetics can induce toxicity at two distinct levels. They can either produce local effects through direct contact with the neural elements or be absorbed into the bloodstream from the injection site, leading to systemic effects.
Once absorbed into the systemic circulation, local anesthetics can affect the organs that depend on the functioning of sodium...
Once absorbed into the systemic circulation, local anesthetics can affect the organs that depend on the functioning of sodium...
01:29Local Anesthetics: Clinical Application as Epidural Anesthesia
Epidural anesthetics are administered in the fat-filled epidural space, the outermost part of the spinal canal. This technique is commonly employed for pain management and anesthesia during lower abdomen and pelvis surgeries or labor and delivery.
Since epidural anesthetics can be infused through an epidural catheter, all types of drugs, including short-acting ones, can be administered. Chloroprocaine and lidocaine are examples of short and long-duration anesthetics, respectively. Bupivacaine...
Since epidural anesthetics can be infused through an epidural catheter, all types of drugs, including short-acting ones, can be administered. Chloroprocaine and lidocaine are examples of short and long-duration anesthetics, respectively. Bupivacaine...
01:24General Anesthesia: Overview
Anesthesia is a medical procedure that uses drugs for CNS suppression to enable painless surgeries and procedures. The selection of anesthetics is influenced by their pharmacokinetic properties, side effects, and patient characteristics. Various types of anesthesia include general, local, regional, spinal, and inhalational.
General anesthesia induces unconsciousness in the whole body, while the others target specific areas or sensations. It is administered to minimize adverse effects, maintain...
General anesthesia induces unconsciousness in the whole body, while the others target specific areas or sensations. It is administered to minimize adverse effects, maintain...
01:22Stages of General Anesthesia
Various sedation levels offer significant advantages in facilitating procedural interventions for patients undergoing medical or invasive surgical procedures. These levels span from anxiolysis to general anesthesia, providing a spectrum of sedative effects to cater to specific patient needs. Anxiolysis reduces anxiety and is achieved through minimal sedation, enabling patients to remain awake and responsive while feeling more at ease during the procedure. This level can benefit minor...
01:24Parenteral Anesthetics: Overview
Intravenous anesthetics are drugs administered parenterally to induce anesthesia or sedation. Propofol is a widely used agent formulated as a 1% emulsion in soybean oil, glycerol, and egg phosphatide. It induces rapid anesthesia primarily due to its rapid distribution from the bloodstream to target tissues and is metabolized in the liver. However, it can cause significant pain on injection and hypertriglyceridemia. Fospropofol, a water-based prodrug of propofol, lacks these adverse effects.
01:20Inhalational Anesthetics: Overview
Inhalation anesthetics are drugs that induce general anesthesia upon inhalation. They work by increasing the sensitivity of GABAA receptors or inhibiting NMDA receptors, leading to a decrease in central nervous system activity. The depth of anesthesia can be rapidly adjusted by changing the concentration of the inhaled gas. Some common examples of inhalational anesthetics include volatile liquids like isoflurane, desflurane, sevoflurane and gases like xenon and nitrous oxide. Isoflurane, a...