Vacuum drainage (active aspiration)
This method is considered one of the most effective drainage techniques because it accelerates the resolution of inflammation and the closure of tissue defects. The main requirement for its application is the airtightness of the drained cavity.
Main indications:
- A tightly sutured wound.
- Pleural empyema (in addition to draining exudate, negative pressure helps re-expand the lung).
- Purulent arthritis.
- Isolated abscess cavity.
The essence of the technique is to create continuous negative pressure within the drainage system. This results in the forced evacuation of contents and helps bring the wound walls together. Negative pressure can be created in several ways: using a Janet syringe (by evacuating air from a sealed jar connected to the drainage), a water-jet pump, or a classic three-bottle system.
Treatment in an abacterial environment
This approach aims to create strictly aseptic conditions directly in the affected area. The method is indispensable for extensive burns, when the natural barrier functions of the skin are lost.
Depending on the localization of the wound, either only the affected limb or the entire patient is placed into a special isolation chamber.
How the system works:
- Atmospheric air passes through the inlet filter for initial purification.
- The compressor pumps the airflow.
- Air is passed through a bacterial filter, where complete sterilization takes place.
- Via the air duct, the sterile environment is supplied to the isolator (chamber).
- The airtightness of the system is ensured by a special isolator lock.
Application of laser and ultrasound
Modern physical antisepsis actively utilizes hardware techniques for wound debridement. They allow for effective infection control while causing minimal trauma to healthy tissues.
Laser radiation In wound surgery, low-power carbon dioxide (CO2) lasers are most frequently used. The focused beam vaporizes bacteria and necrotic tissue without damaging viable structures. A thin coagulation film is formed on the bottom and walls of the wound. Its main function is to create a barrier that prevents microorganisms and their toxins from penetrating deeper into the tissues.
Low-frequency ultrasound (US) Ultrasonic treatment has a pronounced bactericidal effect. Its mechanism of action in the liquid wound environment consists of two processes:
- Cavitation effect: the formation of shock waves and microscopic cavitation bubbles that destroy bacteria.
- Water ionization: the formation of active $H^+$ and $OH^-$ ions.
As a result of these physicochemical reactions, oxidation-reduction processes in the microbial cell are completely halted, leading to its death.
Briefly: answers to topical questions
In which cases is the patient placed entirely inside a special isolation chamber for treatment in an abacterial environment?
The patient is placed entirely inside a special isolation chamber in cases of extensive burns. The goal of treatment in an abacterial environment is to create aseptic conditions directly in the wound area.
The design of the isolation unit includes:
- Inlet filter — purification of incoming air.
- Compressor — air pumping.
- Bacterial filter — air sterilization before delivery to the patient.
- Air duct — delivery of sterile air.
- Isolator — location of the patient.
- Isolator lock — sealing.
Class and exam questions
In what cases can active aspiration be used?
Only under the condition of complete cavity airtightness. The method is indicated for sutured wounds, purulent arthritis, abscesses, and pleural empyema.
Why is a coagulation film needed after laser wound treatment?
The film formed under the action of a low-power carbon dioxide laser acts as a protective barrier, preventing microorganisms and toxins from entering the surrounding tissues.
How exactly does low-frequency ultrasound kill bacteria?
Ultrasound induces a cavitation effect and water ionization with the release of $H^+$ and $OH^-$ ions in the liquid medium. This blocks oxidation-reduction reactions within the microbial cell.
What else to study on this topic
- The laws of osmosis and diffusion in the mechanism of action of hypertonic solutions
- The principle of siphon action and the hygroscopicity of dressings
- Comparative characteristics of the water-jet pump and the three-bottle system
- Clinical aspects of carbon dioxide lasers in purulent surgery
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Other topics in the section "CHAPTER 2. ASEPSIS AND ANTISEPSIS"
Prepared by WhiteCoat Pro faculty in accordance with the medical school curriculum. For educational purposes only.