Endoscopy Flashcards
What is endoscopy?
An optical device that provides a detailed image of the inside of the body.
Considered to be minimally invasive.
Allows access to otherwise inaccessible areas of the body.
Most are carried out by use of natural orifices or small incisions into the skin.
What is a rigid endoscopy?
- Used to examine non-tubular structures.
- Better image quality and light transmission.
- Larger instruments can be used – doesn’t always need to pass down instrument channel.
Simple design.
Less expensive.
Easier to clean.
What is a flexible endoscopy?
Used to examine internal tubular structures.
Poorer light transmission – pixilated view.
Can only use small instruments – have to pass down instrument channel.
Costly.
Can only be cleaned by trained team members.
What does an endoscopy consist of?
Lighting system
Visualisation
Channels
Interface
What is the lighting system of an endoscope?
The light source is external to the endoscope and illuminates the organ/area of interest.
What is the interface of an endoscope?
Light source, air pump, camera processor, character generator and still image capture system all in one device.
Images are captured on a PCMCIA card – can be downloaded onto further devices.
Flexible endoscopy
What is a fibrescope?
The image is transmitted via a fibreoptic image bundle from the objective lens at the tip of the insertion tube to the ocular lens located in the eyepiece.
Flexible endoscopy
What is a videoscope?
The image is transmitted electronically through wires from a sensor located behind the objective lens at the distal tip, along the length of the endoscope to a video processor which produces an image on the screen.
