Related Experiment Video
Updated: Aug 8, 2026
06:36
Effects of Mechanical Methods Used in Peri-implantitis Treatment on Implant Surface Decontamination and Roughness
Published on: March 14, 2025
Surface decontamination of surgical instruments: an ongoing dilemma
H Murdoch1, D Taylor, J Dickinson
1Centre for Emergency Preparedness and Response (Laboratory A), Health Protection Agency, Porton Down, Salisbury, UK.
The Journal of Hospital Infection
|June 9, 2006
Summary
Routine cleaning of surgical instruments is crucial to prevent cross-infection. This study found significant protein contamination on many instruments, posing a risk for prion diseases like variant Creutzfeldt Jakob disease (vCJD) and reducing disinfection effectiveness.
Area of Science:
- Healthcare-associated infections
- Medical device reprocessing
- Prion disease transmission
Background:
- Surgical instrument cleanliness is vital due to cross-infection risks, including variant Creutzfeldt Jakob disease (vCJD).
- Effective cleaning and disinfection are essential for reusable surgical instruments.
Purpose of the Study:
- To assess residual total protein contamination on surgical instruments post-cleaning.
- To evaluate the effectiveness of routine hospital cleaning and disinfection protocols.
Main Methods:
- Anonymized, wrapped, and autoclaved surgical instruments were analyzed in two independent laboratories.
- Instruments were tested for residual protein and total organic matter content.
Main Results:
- 17% of instruments in Laboratory A exceeded a 200 microg protein threshold, with some showing over 1 mg of protein.
- Median protein levels in Laboratory B varied significantly between hospitals (8-91 mug).
- Residual organic matter ranged from 0.62 mg to 45 mg per instrument.
Conclusions:
- A notable proportion of surgical instruments retain protein contamination at the point of use.
- This contamination poses a direct cross-infection risk from prions and other pathogens.
- Current cleaning and disinfection strategies may be insufficient against prion and traditional infectious agents.
Related Concept Videos
01:30Cleaning, Sterilization, and Disinfection
Cleaning, disinfection, and sterilization are the methods that help to break the infection chain and prevent disease.
Cleaning
The cleaning process usually involves using water with detergents or enzymatic cleaner and removing foreign material from objects and surfaces, including organic material such as body fluids or inorganic material like soil. Cleaning is performed before high-level disinfection and sterilization because foreign materials on the cover of the devices interfere with process...
Cleaning
The cleaning process usually involves using water with detergents or enzymatic cleaner and removing foreign material from objects and surfaces, including organic material such as body fluids or inorganic material like soil. Cleaning is performed before high-level disinfection and sterilization because foreign materials on the cover of the devices interfere with process...
01:23Hand hygiene
Asepsis is the practice of preventing or breaking the chain of infection. The nurse employs aseptic techniques to prevent the spread of microorganisms and reduce the risk of diseases. Hand hygiene is the cornerstone of aseptic techniques and is classified into medical and surgical asepsis. Medical asepsis includes hand hygiene and the use of gloves. Surgical asepsis, or the sterile technique, refers to practices that render and keep objects and areas free of microorganisms.
Hand washing...
Hand washing...
01:30Methods of Sterilization II: Chemical Methods
In healthcare, the chemical method of sterilization uses chemical sterilants to treat surgical instruments and medical supplies to help prevent the transmission of infectious pathogens to patients. Due to heat sensitivity, most medical supplies and equipment should not be exposed to high temperatures. These parts include rubber, plastic, glass, and other similar elements.
Using chemical sterilization rather than heat to clean out equipment is recommended. It eradicates and removes all bacteria,...
Using chemical sterilization rather than heat to clean out equipment is recommended. It eradicates and removes all bacteria,...
01:28Asepsis
The condition of being free from disease-causing living pathogens is asepsis. Aseptic techniques include a set of standard practices to achieve asepsis. An example is the regular environmental cleaning of all parts of the healthcare facility and hand hygiene at home before preparing or eating food. Medical and surgical asepsis in healthcare practice protects patients from harmful pathogens, minimizes the risk of contamination of susceptible sites, and reduces the risk of infection transmission.
01:26Standard Precaution
Standard precautions are the minimum infection control safeguards used while caring for all patients, irrespective of their disease condition. They help prevent the spread of common infectious microorganisms to healthcare workers, patients, and visitors in all healthcare settings.
Hand hygiene is the most crucial means to prevent the transmission of disease. Employers are legally required to provide their workers with personal protective equipment (PPE) to minimize exposure or contact with...
Hand hygiene is the most crucial means to prevent the transmission of disease. Employers are legally required to provide their workers with personal protective equipment (PPE) to minimize exposure or contact with...
01:15Handwashing III: During the Procedure and Post-Procedure Steps
To wash hands properly, follow these steps: