A medical device includes an insertion tube, having a proximal end and a distal end, which is configured for insertion into a body cavity of a subject. An optical assembly is contained in the distal end and configured to form an image of a target region in the body cavity. A working channel passes t
A medical device includes an insertion tube, having a proximal end and a distal end, which is configured for insertion into a body cavity of a subject. An optical assembly is contained in the distal end and configured to form an image of a target region in the body cavity. A working channel passes through the insertion tube and is configured to convey a fluid from the proximal to the distal end. The working channel has a segment adjacent to the distal end that is narrowed so as to cause the fluid to exit the working channel into the target region in a diverging cone.
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1. Medical apparatus, comprising: an endoscope, comprising an insertion tube, having a proximal end and a distal end, which is configured for insertion into a body cavity of a subject, and containing a working channel, which conveys a liquid from the proximal end to a target region in the body cavit
1. Medical apparatus, comprising: an endoscope, comprising an insertion tube, having a proximal end and a distal end, which is configured for insertion into a body cavity of a subject, and containing a working channel, which conveys a liquid from the proximal end to a target region in the body cavity adjacent to the distal end; a fluid sensor, contained in the distal end of the endoscope, which measures a rate of flow of the liquid in the working channel; and a control unit which is configured to regulate the flow of the liquid in the working channel responsively to the measured rate of flow; wherein the working channel has a segment adjacent to the distal end of the endoscope that is narrowed, a converging segment proximal to the narrowed segment, and a diverging segment distal to the narrowed segment, thus defining a Venturi tube; wherein the diameter of the converging segment narrows from about 2.5 times greater than the diameter of the narrowed segment to about the same diameter as the narrowed segment; wherein the diameter of the diverging segment expands from about the same diameter as the narrowed segment to about 3 times greater than the diameter of the narrowed segment; and the liquid exits the working channel in a divergent cone to irrigate the entire target region such that it clears blood and/or debris. 2. The apparatus according to claim 1, wherein the endoscope comprises an optical assembly contained in the distal end and configured to form an image of the target region, and wherein the control unit is configured to process the image and to regulate the flow of the fluid through the working channel responsively to a quality of the image. 3. The apparatus according to claim 2, wherein the control unit is configured to set the flow automatically, responsively to the rate of flow and the quality of the image, so as to maximize a contrast of the image while minimizing a rate of the flow, within respective, predetermined upper and lower limits of the rate and contrast. 4. A method for medical treatment, comprising: providing an endoscope having a distal end for insertion into a body cavity of a subject and containing a working channel for conveying a liquid from a proximal end of the endoscope to a target region in the body cavity adjacent to the distal end; measuring a rate of flow of the liquid in the working channel, wherein measuring the rate of the flow comprises receiving a reading from a fluid sensor contained in the distal end of the endoscope; and regulating the flow of the liquid in the working channel responsively to the measured rate of flow; wherein the working channel has a segment adjacent to the distal end of the endoscope that is narrowed, a converging segment proximal to the narrowed segment and a diverging segment distal to the narrowed segment thus defining a Venturi tube; wherein the diameter of the converging segment narrows from about 2.5 times greater than the diameter of the narrowed segment to about the same diameter as the narrowed segment; wherein the diameter of the diverging segment expands from about the same diameter as the narrowed segment to about 3 times greater than the diameter of the narrowed segment; and the liquid exits the working channel in a divergent cone to irrigate the entire target region such that it clears blood and/or debris. 5. The method according to claim 4, wherein the endoscope comprises an optical assembly contained in the distal end and configured to form an image of the target region, and wherein regulating the flow comprises measuring a quality of the image and regulating the flow of the liquid through the working channel responsively to the measured quality of the image. 6. The method according to claim 5, wherein regulating the flow comprises setting the flow automatically, responsively to the rate of flow and the measured quality, so as to maximize a contrast of the image while minimizing a rate of the flow, within respective, predetermined upper and lower limits of the rate and contrast. 7. Medical apparatus, comprising: an endoscope, comprising an insertion tube, having a proximal end and a distal end, which is configured for insertion into a body cavity of a subject, and containing a working channel, which conveys a liquid from the proximal end to a target region in the body cavity adjacent to the distal end; a fluid sensor, which measures a rate of flow of the liquid in the working channel; and a control unit, which is configured to regulate the flow of the liquid in the working channel responsively to the measured rate of flow;wherein the fluid sensor is contained in the distal end of the endoscope;the working channel ends in a nozzle at the distal end;the nozzle includes a narrowed segment adjacent to the distal end;the liquid exits the working channel in a divergent cone to irrigate the entire region such that it clears blood and/or debris; andthe insertion tube has a diameter about equal to or about less than 3 mm. 8. The apparatus according to claim 7, wherein the endoscope comprises an optical assembly contained in the distal end and configured to form an image of the target region, and wherein the control unit is configured to process the image and to regulate the flow of the liquid through the working channel responsively to a quality of the image. 9. The apparatus according to claim 8, wherein the control unit is configured to set the flow automatically, responsively to the rate of flow and the quality of the image, so as to maximize a contrast of the image while minimizing the rate of the flow, within respective, predetermined upper and lower limits of the rate and contrast.
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