Endoscopes brought about a significant advance to surgery.
You can now see lesions that previously you could not.
You can now take a biopsy under vision and get tissue diagnosis
You can now see the effect of treatment on a lesion.
You can now keep along term record of the lesion for followup.
You can now use endoscopes to execute surgical procedures.
What is the light source
The fiber light bundle is connected at one end to the light
source and at the other to the endoscope.
- It contains a bundle of up to 20,000 flexible optical fibers
which can conduct light but not capable of carrying an
Image (E as shown in Fig 7.1)
- The bundles transmit a pre-focused light of high intensity
and uniform density to the endoscope
- The bundle’s outer covering is metal and PVC, and is flexible
- This light is called cold light since it carries no heat with it
- In addition, a separate set of up to 36,000 optical fibers
capable of carrying an image terminating proximally at an
Eyepiece, and distally at a lens at the end of the endoscope
(F as shown in Fig 7.1)
- Both these sets of optical fibers are contained in a
protective sheath of endoscope, generally this sheath
Incorporates additional channels for:
. Suction (G as shown in Fig 7.1)
. Gas inflation/irrigation (H as shown in Fig 7.1)
. A passage for flexible biopsy or operative forceps and
Electrodes Fig 5.3
. Some special instruments used thriugh this port are shown
in Fig 5.4
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