1. An endoscope sheath comprising:
a relatively inelastic sheath body, the relatively inelastic sheath body having a proximal sheath end longitudinally separated from a distal sheath end and defining a sheath lumen,
a scope aperture located at the proximal sheath end in fluid communication with the sheath lumen and configured to admit an elongate endoscope body into the sheath lumen,
a sheath tip located at the distal sheath end, at least a portion of the sheath tip being configured to permit energy transmission therethrough and being located longitudinally adjacent to an endoscope lens when the elongate endoscope body is located within the sheath lumen,
an evacuation fitting in fluid communication with the sheath lumen and configured for selective removal of fluid from the sheath lumen, and
an elongate secondary tube having a proximal secondary tube end longitudinally separated from a distal secondary tube end and defining a secondary lumen, at least a portion of the secondary lumen extending substantially parallel to the sheath lumen.
2. The endoscope sheath of claim 1, wherein the evacuation fitting includes a valve having a pilot balloon coupled thereto.
3. The endoscope sheath of claim 1, wherein the sheath body is formed from a first material and the sheath tip is formed from a second material.
4. The endoscope sheath of claim 3, wherein the first material is polytetrafiuoroethylene.
5. The endoscope sheath of claim 4, wherein the second material is silicone rubber.
6. The endoscope sheath of claim 3, wherein the elongate secondary tube is formed from the first material.
7. The endoscope sheath of claim 1, wherein the elongate secondary tube is secured to the relatively inelastic sheath body.
8. The endoscope sheath of claim 1, wherein the distal secondary tube end is positioned adjacent to the distal sheath end and has an aperture in fluid communication with the secondary lumen.
9. The endoscope sheath of claim 1, wherein the secondary tube is sized to receive a second medical device.
10. The endoscope sheath of claim 1, wherein a handle fitting is positioned at the proximal sheath end, the handle fitting being configured to create a fluidtight seal between elongate endoscope body and the endoscope sheath.
11. The endoscope sheath of claim 1 , further comprising an elongate third tube having a proximal third tube end longitudinally separated from a distal third tube end and defining a third lumen, at least a portion of the third lumen extending substantially parallel to the sheath lumen.
12. A method of using an endoscope sheath, comprising:
inserting an endoscope body into a lumen of an elongate tubular body of the endoscope sheath,
creating a fluidtight seal between the endoscope body and the elongate tubular body, and
removing fluid from between the endoscope body and the elongate tubular body to bring the elongate tubular body into contact with the endoscope body.
13. The method of claim 12, wherein the elongate tubular body of the endoscope sheath is relatively inelastic.
14. The method of claim 13, wherein removing fluid from between the endoscope body and the elongate tubular body includes creating negative pressure within the lumen of the elongate tubular body.
15. The method of claim 12, wherein inserting the endoscope body into the lumen of the elongate tubular body includes placing a distal end of the endoscope body in contact with the distal end of the elongate tubular body.
16. The method of claim 12, further comprising applying a lubricant to one of the endoscope body and the elongate tubular body.
17. A medical device sheath comprising:
a relatively inelastic body, the relatively inelastic body having a proximal end longitudinally separated from a distal end and defining a first lumen,
an aperture located at the proximal end in fluid communication with the lumen and configured to admit a medical device body into the first lumen,
a sheath tip located at the distal end, the sheath tip being configured to permit energy transmission therethrough and being located longitudinally adjacent to a medical device end when the medical device body is located within the first lumen, and
an elongate secondary tube defining a secondary lumen,
wherein a plurality of apertures are defined at the distal end of the relatively inelastic body, and at least one of the apertures is in fluid communication with the secondary lumen of the elongate secondary tube.
18. The medical device sheath of claim 17, further comprising an evacuation fitting in fluid communication with the first lumen and configured for selective removal of fluid from the first lumen.
19. The medical device sheath of claim 18, the evacuation fitting including a valve having a pilot balloon coupled thereto in fluid communication with the first lumen.
20. The medical device sheath of claim 17, wherein the plurality of apertures are arranged in a circular pattern.
21. An endoscope sheath comprising:
a relatively inelastic sheath body, the relatively inelastic sheath body having a proximal sheath end longitudinally separated from a distal sheath end and defining a sheath lumen;
a scope aperture located at the proximal sheath end in fluid communication with the sheath lumen and configured to admit an elongate endoscope body into the sheath lumen;
a sheath tip located at the distal sheath end, at least a portion of the sheath tip being configured to permit energy transmission therethrough and being located longitudinally adjacent to an endoscope lens when the elongate endoscope body is located within the sheath lumen; and
an evacuation fitting in fluid communication with the sheath lumen and configured for selective removal of fluid from the sheath lumen.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method for reducing flicker, comprising:
generating an adjusted rectified voltage in response to a TRIAC signal from a TRIAC dimmer;
generating a switching current in response to the adjusted rectified voltage being greater than a first reference voltage;
decreasing the switching current in response to the adjusted rectified voltage becoming less than the first reference voltage;
generating a first control signal in response to the adjusted rectified voltage becoming less than the first reference voltage;
decreasing a second reference voltage in response to the first control signal; and
turning off the TRIAC dimmer in response to decreasing the switching current.
2. The method of claim 1, wherein decreasing the switching current in response to the adjusted rectified voltage includes decreasing the switching current to zero.
3. The method of claim 1, wherein generating a switching current in response to the adjusted rectified voltage being greater than a first reference voltage comprises:
asserting a pulse control signal in response to the adjusted rectified voltage being greater than the first reference voltage; and
generating a switch control signal at a control terminal of a switching device in response to asserting the pulse control signal.
4. The method of claim 3, further including generating a pulse train in response to asserting the pulse control signal and generating the switch control signal at the control terminal of the switching device in response to the pulse train.
5. The method of claim 3, wherein decreasing the switching current in response to the adjusted rectified voltage becoming equal to the first reference voltage includes de-asserting the pulse control signal and turning off the switching device in response to de-asserting the pulse control signal.
6. The method of claim 1, further including generating a load current in response to the adjusted rectified voltage becoming less than a second reference voltage.
7. The method of claim 6, wherein the second reference voltage is less than the first reference voltage.
8. The method of claim 1, further including generating a load current after turning off the TRIAC dimmer.
9. A method for mitigating flicker, comprising:
generating a rectified voltage in response to a TRIAC signal from a TRIAC;
generating an adjusted rectified voltage from the rectified voltage;
generating a switching signal in response to comparing the adjusted rectified voltage with a first predetermined voltage;
decreasing the switching current in response to the adjusted rectified voltage becoming less than the first reference voltage;
generating a first control signal in response to the adjusted rectified voltage becoming less than the first reference voltage;
decreasing a second reference voltage in response to the first control signal; and
turning off the TRIAC in response to the rectified voltage reaching a first predetermined voltage.
10. The method of claim 9, wherein generating the switching signal comprises generating one of a pulse train or a logic low voltage.
11. The method of claim 10, further including decreasing a TRIAC current in response to the switching signal being a logic low voltage.
12. The method of claim 11, wherein turning off the TRIAC in response to the decreasing the rectified voltage reaching a predetermined voltage includes turning off the TRIAC in response to decreasing the TRIAC current.
13. The method of claim 9, further including activating a switching circuit in response to the rectified voltage reaching a second predetermined voltage, the second predetermined voltage less than the first predetermined voltage.