Colon cleaning system with automatic self-purging features

1. A system for cleaning an intestine, comprising:

an evacuation lumen for evacuating irrigation fluid from said intestine;

a pressure source;

at least one sensor, positioned to detect an environmental condition in or near said evacuation lumen; and

a controller configured to:

measure a flow status of said evacuation lumen based on reporting from said at least one sensor,

determine that the flow status indicates incipient blockage before the incipient blockage amounts to more than a 40% impairment of flow, and

adjust the pressure from said pressure source to prevent said incipient blockage from increasing, based on said determination;

wherein said being configured to determine that the flow status indicates incipient blockage comprises being configured to determine a location in the system of the incipient blockage, said location being a basis on which the pressure is adjusted.

2. The system of claim 1 , wherein said pressure source is operable to alternately apply proximally-directed and distally-directed pressure gradients to said evacuation lumen.

3. The system of claim 1 , wherein said incipient blockage is determined while the rate of evacuation matches or exceeds a rate of introduction of said irrigation fluid to said intestine.

4. The system of claim 1 , wherein said controller is configured to determine indication of the incipient blockage while the incipient blockage comprises less than a 50% occlusion of a cross-section of the evacuation lumen.

5. The system of claim 1 , wherein said controller is configured to determine indication of the incipient blockage while the incipient blockage comprises less than a 10% occlusion of a cross-section of the evacuation lumen.

6. The system of claim 1 , wherein said incipient blockage comprises a decreasing rate of evacuation due to increasing obstruction of an evacuation lumen.

7. The system of claim 1 , wherein said being configured to adjust the pressure comprises being configured to adjust through at least two cycles of increasing and then decreasing a distally directed pressure.

8. The system of claim 1 , wherein said controller is configured to re-measure the flow status and to redetermine indication of incipient blockage therefrom during said adjusting of pressure, and to control said adjusting of the pressure based upon finding that the indication of incipient blockage is continued.

9. The system of claim 1 , wherein said at least one sensor comprises a plurality of sensors selected from a group consisting of:

(a) a sensor positioned on external surface of a distal portion of said evacuation lumen and external to said lumen;

(b) a sensor positioned within said evacuation lumen and within 5 mm of a distal end of said evacuation lumen;

(c) a sensor positioned within said evacuation lumen and 5-30 mm of a distal end of said evacuation lumen;

(d) a sensor positioned within said evacuation lumen and 3-160 cm from a distal end of said evacuation lumen;

(e) a sensor positioned within said evacuation lumen and 160-250 cm from a distal end of said evacuation lumen;

(f) a sensor positioned within said evacuation lumen and at least 250 cm from a distal end of said evacuation lumen; and

(g) a sensor positioned within a fluid supply tube which supplies a fluid flow to a distal portion of said evacuation lumen.

10. The system of claim 1 , wherein said being configured to measure a flow status comprises being configured to measure at least one of the group consisting of a change in a sensed:

(a) pressure from one or more sensors;

(b) pressure difference among two or more sensors;

(c) flow;

(d) optical property; and

(e) bulk material property.

11. The system of claim 1 , wherein said system comprises a plurality of evacuation lumens; and

the pressure applied to each of said plurality of evacuation lumens by said pressure source is individually controllable.

12. The system of claim 1 , wherein:

said at least one sensor is positioned to detect pressure in said evacuation lumen; and

said being configured to measure a flow status comprises being configured to measure a pressure change in said evacuation lumen.

13. The system of claim 1 , comprising:

an intestinal pressure sensor positioned to sense pressure within the intestine, outside of the evacuation lumen; and

an irrigation supply channel supplying irrigation fluid to said intestine;

said controller being configured to:

determine an inflation pressure of said intestine based on reporting from said intestinal pressure sensor, and

vary the supply of irrigation fluid to said intestine based on said determination.

14. The system of claim 1 , wherein said controller is configured to determine indication of the incipient blockage before the incipient blockage amounts to more than a 20% impairment of flow in the evacuation lumen.