CBET - Certified Biomedical Equipment Technician Surgical Equipment Technology Questions and Answers

Question 1

A harmonic scalpel is a surgical instrument that cuts and coagulates tissue. What is the underlying physical principle it uses to achieve this effect?

Accepted Answer

High-frequency ultrasonic vibration

Answer

A harmonic scalpel uses a piezoelectric transducer in the handpiece to convert electrical energy into high-frequency (typically 55,500 Hz) ultrasonic mechanical vibrations. This vibration is transferred to the blade, which denatures proteins and creates a coagulum to seal vessels while simultaneously cutting tissue with minimal thermal spread.

Question 2

During a laparoscopic procedure, what is the primary function of a surgical insufflator?

Accepted Answer

To distend the abdominal cavity with CO2 gas

Answer

The primary function of an insufflator is to deliver a controlled flow of carbon dioxide (CO2) gas to inflate, or distend, the abdominal cavity. This process, called pneumoperitoneum, lifts the abdominal wall away from the internal organs, creating a clear and stable working space for the surgeon to maneuver instruments.

Question 3

A steam autoclave cycle completes and the physical monitors (temperature and pressure graphs) indicate all parameters were met. However, a biological indicator (BI) test from the load subsequently fails (shows growth). Which of the following is the MOST probable cause?

Accepted Answer

The load was too dense or improperly packed, creating air pockets.

Answer

When physical monitors show a successful cycle but the BI fails, it often points to a steam penetration issue rather than an equipment malfunction. Overloading the chamber or packing items too densely can create air pockets that prevent steam from contacting the BI, thus allowing the heat-resistant spores to survive even though the chamber itself reached the correct temperature and pressure.

Question 4

Which type of surgical laser is highly absorbed by water, making it extremely effective for precise soft-tissue cutting and vaporization with minimal collateral thermal damage?

Accepted Answer

CO2 (Carbon Dioxide)

Answer

The CO2 laser operates at a wavelength (typically 10,600 nm) in the far-infrared spectrum that is strongly absorbed by water, the primary component of soft tissue. This high absorption allows the laser to vaporize tissue very precisely at the point of contact, with a shallow depth of penetration and minimal spread of heat to surrounding areas.

Question 5

A BMET is performing a preventive maintenance inspection on a pneumatic surgical tourniquet. Which of the following is the MOST critical safety verification?

Accepted Answer

Verifying the accuracy of the pressure display and its ability to maintain a set pressure

Answer

The most critical function of a pneumatic tourniquet is to apply and maintain a precise, stable pressure to occlude blood flow safely. Verifying the accuracy of the pressure transducer and ensuring the system can hold a set pressure without significant leaks are paramount to preventing patient injury, such as nerve damage from over-pressurization or loss of the surgical field from under-pressurization.

CBET - Certified Biomedical Equipment Technician Practice Test

CBET - Certified Biomedical Equipment Technician Practice Test

CBET - Certified Biomedical Equipment Technician Surgical Equipment Technology Questions and Answers