Medical laser protection
Laser medicine is the use of lasers in medical diagnosis, treatments, or therapies, such as laser photodynamic therapy, photorejuvenation, and laser surgery. The applications of lasers in medicine are mainly based on the possibility of strong bundling and the high power density of the beam.
The variety of laser applications in medicine is growing fast, thus presenting PhotonSafe with the growing challenge of developing and supplying adequate laser protection.
Safe Use of Lasers in Health Care
Medical lasers have become a major advancement in modern healthcare, thanks to their ability to produce monochromatic, coherent, and precisely focused beams of light. Medical lasers have been widely used for various diseases. This technology has unlocked applications that once seemed out of reach, from vision correction procedures to early cancer detection. What sets lasers apart is their unique capability to cut, coagulate, ablate, and image tissue with remarkable accuracy, making them an essential tool across a growing range of medical disciplines.
Despite the notable benefits, lasers could cause several complications, such as skin burn, eye injury, airway fire, and so on. These accidents may occur not only with patients, users of the laser, or laser handlers, but also to people passing in front of the laser treatment room. Although there is a risk associated with the laser, most of them can be prevented through good training, the use of proper protection equipment, and ensuring the safe operation of the laser at all times. Due to the increasing use of lasers and the growing interest in their use, medical institutions should particularly emphasize the safe use of lasers and introduce systems for laser safety.
Medical Lasers Market Taxonomy:
By Devices
- Pain management device
- Glucose monitoring devices
- Respiratory Therapy devices
Medical Lasers Market By Applications
- Home healthcare
- Remote Patient Monitoring
- Sports and Fitness
Laser-Tissue Interactions
These may be wavelength-dependent or independent.
Wavelength-Dependent Mechanisms
Photothermal Interactions
Laser light energy is converted to heat, which destroys tissue by coagulation, vaporization or cutting. After heating is accomplished, the heat diffuses into neighboring tissues. For minimal unwanted thermal damage, the thermal relaxation (cooling) duration should not be exceeded by the duration of the laser pulse.
Photochemical Effects
These are caused by laser excitation of electronic bonds which rupture to cause molecular fragmentation (photodecomposition) but without significant tissue heating effects.
- Photodynamic Therapy (PDT)
This uses photosensitizers to accept the light energy and become activated, following which they energize other molecules nearby which are often toxic and cause oxidative damage and cell death. Sometimes PDT acts by activating molecules in the irradiated tissue to alter the metabolism.
- Biostimulation
This photochemical phenomenon goes by many names such as Low Laser Level Therapy (LLLT) and low intensity-low power therapy. It uses near-infra red light in a monochromatic beam to stimulate growth and regeneration of soft tissues as well as promote pain relief.
- Photoablation Therapy
Also called ablative photodecomposition, this refers to the breaking of molecular bonds to produce precise and controlled tissue ablation without heating.
Wavelength-Independent Mechanisms
When the power density crosses a certain limit with very short pulses, the tissue undergoes optical breakdown due to multiphoton ionization of atoms and molecules in both pigmented and other tissue. This causes plasma to form and generates a shock wave, often leading to cavitation and jetting inside soft tissues. Controlled plasma formation can be used for clean and precise surgery without thermomechanical damage if limited to pico- or femtosecond pulses.
Applications of medical lasers
Laser Surgery
In surgery, lasers can do three things based on their peculiar attributes:
- Cut deeply and cauterize as it cuts, producing a precise wound with little hemorrhage
- Ablate tissue by vaporizing the tissue surface
- Allow internal surgery without an open wound using specialized optical fiber
Uses
- Lasers can be used to remove superficial cancers or very early neoplasms of the genital organs or sometimes non-small cell lung cancers
- Tumors can be shrunk using CO2 or Nd:YAG lasers
- They may also relieve bleeding or obstructive complications of tumors by sealing blood vessels or debulking large growths.
- When used for curative therapy, lasers are combined with chemo- or radiotherapy, or surgery
- Lasers are also used to close off nerve endings or lymph vessels to prevent neuromas and tumor cell metastasis
- As mentioned earlier, PDT uses the photochemical effects of lasers to selectively destroy cancer cells
- Laser ablation is used to treat skin lesions, using CO2 lasers.
- Laser treatment of vascular lesions is with green and yellow light, originally with the argon laser but now with the pulsed yellow dye laser
- Angioplasty and cardiac revascularization using laser drilling
- Cosmetic and dermatologic surgery
- Laser applications for brain tumor treatment include:
- Obtaining a biopsy for diagnosis
- Removal of tumor tissue wholly or partially
- Palliative tumor debulking to reduce intracranial pressure which is causing symptoms
- Removal of hard or very fragile tumors or growths which are deep within the brain or have infiltrated the skull
- Removal using PDT
- Creating a route for chemotherapy or internal radiation therapy implants, or for hypertherapy and brain mapping during surgical procedures
Advantages
- Laser beams can cut accurately and rapidly through tissues
- Less pain and bleeding
- Reduces scarring
- No direct contact with the tissue
- Better visualization
- The skin is less damaged and the skin edges are free of infection
- Can be combined with flexible fiberoptics, low-power microscopes, and micromanipulators to avoid large incisions
- Shorter recovery times
Disadvantages
Laser therapy must be done only by well-trained specialists with stringent safety regulations, the cost of the setup and the size of the required equipment and the needed safety and protection equipment. Some effects are short-lived and treatment must be repeated.