Autoclavable endoscope
View Patent ↗An autoclavable endoscope, such as the type used in ophthalmological operations, has a probe that contains optical fiber guides such as an image guide, a laser guide and an illumination guide. The distal end of these guides are sealed to the distal end of the probe with a high temperature medical grade epoxy. The epoxy is selected to retain its structural and optical properties at autoclaving conditions. A preshrunk flexible plastic jacket extends proximal of the handle around the three guides. Because it is preshrunk at autoclavable temperatures, it is not further damaged during autoclaving. The epoxies used proximal to the probe have to be high temperature epoxies but are generally preferably a more flexible urethane type epoxy. Proximal connectors and ferule for the guides are selected metals to retain size and/or conduct heat.
1. In an autoclavable endoscope having a probe with a sidewall containing at least an optical fiber illumination guide having light fibers, a laser fiber guide and an optical fiber image guide and wherein the distal end of the image guide contains a cylindrical cannula within which is positioned a window at the distal end of the cannula, an objective lens having first and second lens elements proximal to and adjacent to the window, the image guide fibers being proximal and adjacent to the proximal one of the lens elements, and a handle proximal to the probe, the improvement comprising:
a preshrunk flexible plastic jacket extending proximal of the handle and encompassing said optical guides,
a trifurcation zone at the proximal end of said jacket from which zone said guides extend proximally,
a first type epoxy bonding the distal ends of said guides to said probe, said first epoxy also bonding the circumference of the distal lens element and the circumference of the window within the cylindrical cannula at the end of the image guide,
a second type epoxy bonding the proximal lens element to the cannula,
a third type epoxy bonding said jacket to the optical guides at said trifurcation,
said first type epoxy being a medical grade, high temperature resistant, overnight setting epoxy which retains its structure and optical properties at autoclaving conditions,
said second type epoxy being a high temperature grade, more rapidly setting epoxy which retains its structural and optical properties at autoclaving temperature,
said third type epoxy being a high temperature, flexible epoxy,
said first type epoxy preventing steam from reaching and contaminating the lens during autoclaving,
said jacket being preshrunk at autoclaving conditions to minimize jacket shrinkage during autoclaving of the endoscope,
a first metal connector at the proximal end of the illumination guide, said connector including a high heat conductivity metal ferule bonded to the light fibers by said second type epoxy,
and second metal connector at the proximal end of the image guide.
2. The improvement of claim 1 wherein: said metal ferule of said first metal connector is copper.
3. The improvement of claim 2 wherein: said first and second metal connectors are aluminum.
4. The improvement of claim 3 wherein: said third type epoxy bonds the jacket to the hand piece and to all connectors.
5. The improvement of claim 4 wherein: said first metal connector is bonded to the light fibers by an epoxy selected from said first and second types.
6. The improvement of claim 2 wherein: said third type epoxy bonds the jacket to the hand piece and to all connectors.
7. The improvement of claim 3 wherein: said first metal connector is bonded to the light fibers by an epoxy selected from said first and second types.
8. The improvement of claim 1 wherein: said first and second metal connectors are aluminum.
9. The improvement of claim 8 wherein: said third type epoxy bonds the jacket to the hand piece and to all connectors.
10. The improvement of claim 9 wherein: said first metal connector is bonded to the light fibers by an epoxy selected from said first and second types.
11. The improvement of claim 1 wherein: said third type epoxy bonds the jacket to the hand piece and to all connectors.
12. The improvement of claim 1 wherein: said first metal connector is bonded to the light fibers by an epoxy selected from said first and second types.