# US 9,039,626 B2 · Medical device with means to improve transmission of torque along a rotational drive shaft > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,039,626 B2 - Document ID: US9039626B2 - Status: Granted - Kind: B2 - Application number: 12/751,800 - Filed: 2010-03-31 - Published: 2010-09-30 - Granted: 2015-05-26 - Earliest claimed: 2009-03-31 - Assignees: Sunnybrook Health Sciences Centre - Applicants: Brian Kent Courtney - Inventors: Brian Kent Courtney - Web page: https://patentgrep.com/patent/US9039626B2 ## CPC - A61B 5/6852: {Catheters} - A61B 5/0066: {Optical coherence imaging} - A61B 5/0084: {for introduction into the body, e.g. by catheters (A61B5/1459 takes precedence)} - A61B 5/02007: {Evaluating blood vessel condition, e.g. elasticity, compliance} - A61B 8/12: in body cavities or body tracts, e.g. by using catheters - A61B 8/4461: {Features of the scanning mechanism, e.g. for moving the transducer within the housing of the probe} - A61B 18/18: by applying electromagnetic radiation, e.g. microwaves - A61M 25/0113: {Mechanical advancing means, e.g. catheter dispensers} - A61M 39/24: Check- or non-return valves - A61B 1/00096: {Optical elements} - A61B 1/00172: {with means for scanning} - A61B 8/0883: {for diagnosis of the heart} - A61B 8/0891: {for diagnosis of blood vessels} - A61B 8/445: {Details of catheter construction} - A61B 8/543: {involving acquisition triggered by a physiological signal} - A61B 18/1492: {having a flexible, catheter-like structure, e.g. for heart ablation (A61B18/1477 takes precedence)} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) - A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)} ## Abstract The present invention provides minimally invasive imaging probe/medical device having a frictional element integrated therewith for reducing non-uniform rotational distortion near the distal end of a medical device, such as an imaging probe which undergoes rotational movement during scanning of surrounding tissue in bodily lumens and cavities. ## Claims ### Claim 1 A catheter device for insertion into bodily lumens or cavities, comprising: an elongate hollow sheath having a distal end portion, a proximal end portion, and an elongate midsection; a rotational drive shaft housed within said elongate hollow sheath; a functional element mounted to said rotational drive shaft at a location that is remote from said proximal end portion of said elongate hollow sheath; and at least one frictional component operatively associated with at least one of said rotational drive shaft and said functional element, such that said frictional component bears radially outwards to be in frictional contact with an inner surface of said elongate hollow sheath; said frictional component being configured such that an amount of frictional force produced by contact between said frictional component and said inner surface of said elongate hollow sheath is uniform regardless of the angular orientation and longitudinal translation of the rotating components within said hollow elongate sheath; said frictional component being configured such that the contact between said frictional component and said inner surface of said elongate hollow sheath is independent of the angular orientation and longitudinal translation of the rotating components within said hollow elongate sheath; and such that during rotation of said functional element by said rotational drive shaft, said rotational drive shaft is configured to operate with a higher torsional load than in an absence of said frictional component, thereby reducing non-uniform rotational distortion as said functional element rotates inside said elongate hollow sheath. ### Claim 2 (depends on 1) The catheter device according to claim 1 wherein said at least one frictional component comprises one or more generally cylindrical frictional components circumferentially enveloping a portion of said rotational drive shaft, said generally cylindrical frictional components having a radially outwardly projecting portion which bears against the inner surface of said elongate hollow sheath. ### Claim 3 (depends on 2) The catheter device according to claim 2 wherein said at least one generally cylindrical frictional component comprises a plurality of such components spaced along a length of said rotational drive shaft. ### Claim 4 (depends on 2) The catheter device according to claim 2 wherein said at least one generally cylindrical frictional component comprises one or more cylindrical members having an inner radius approximately equal to an outer radius of the rotational drive shaft, and has an outer radius approximately equal to an inner radius of the elongate hollow sheath. ### Claim 5 (depends on 2) The catheter device according to claim 2 wherein said at least one frictional component comprises one or more cylindrical members having an inner radius approximately equal to an outer radius of the rotational drive shaft, wherein the one or more cylindrical members have an outer circumference shaped for making multiple contacts around its circumference between the one or more frictional components and the inner surface of the elongate hollow sheath. ### Claim 6 (depends on 2) The catheter device according to claim 2 wherein said at least one cylindrical frictional component comprises one or more cylindrical members having an inner radius approximately equal to an outer radius of the rotational drive shaft, wherein the cylindrical members comprise one or more flexible extensions radiating therefrom. ### Claim 7 (depends on 1) The catheter device according to claim 1 wherein said at least one frictional component comprises one or more generally cylindrical frictional components that circumferentially envelops said functional element, wherein said generally cylindrical frictional components have a portion that extends radially from said functional element and bears against the inner surface of said elongate hollow sheath. ### Claim 8 (depends on 7) The catheter device according to claim 7 wherein said one or more generally cylindrical frictional components comprise a plurality of such components spaced along said functional element. ### Claim 9 (depends on 7) The catheter device according to claim 7 wherein said one or more generally cylindrical frictional components comprise one or more cylinders having an inner radius approximately equal to an outer radius of the functional element, and has an outer radius approximately equal to an inner radius of the elongate hollow sheath. ### Claim 10 (depends on 7) The catheter device according to claim 7 wherein said one or more cylindrical frictional components comprise one or more cylinders having an inner radius approximately equal to an outer radius of the functional element, wherein the frictional component has an outer circumference shaped for making multiple contacts around its circumference between each frictional component and the inner surface of the elongate hollow sheath. ### Claim 11 (depends on 7) The catheter device according to claim 7 wherein said one or more cylindrical frictional components are one or more cylindrical members having an inner radius approximately equal to an outer radius of the functional element, wherein the one or more cylindrical frictional components comprise one or more flexible extensions radiating therefrom, each flexible extension having a relatively large surface contact with the inner surface of the elongate hollow sheath. ### Claim 12 (depends on 1) The catheter device according to claim 1 wherein said at least one frictional component is a generally spherically shaped and flexible component circumferentially enveloping a portion of said rotational drive shaft, having a radius such that an outer circumference of said spherically shaped component radially bears against the inner surface of said elongate hollow sheath. ### Claim 13 (depends on 1) The catheter device according to claim 1 wherein said at least one frictional component comprises a soft or compressible material so that as fluid is flushed in a proximal to distal direction through the lumen of the hollow elongate sheath, walls of the one or more frictional components can temporarily release their contact with the inner surface of the sheath, thus allowing fluid to flow through the lumen and exit from a distal end portion of the elongate hollow sheath. ### Claim 14 (depends on 13) The catheter device according to claim 13 including fenestrations built into walls of the frictional component to assist fluid passage past the frictional component. ### Claim 15 (depends on 1) The catheter device according to claim 1 wherein said functional element is generally cylindrical in shape, and wherein said frictional component is a generally spherically shaped member circumferentially enveloping said functional element, having a radius such that an outer circumference of said spherically shaped component radially bears against the inner surface of said elongate hollow sheath. ### Claim 16 (depends on 1) The catheter device according to claim 1 wherein said functional element is an imaging assembly configured for emitting an energy beam and receiving reflected energy signals. ### Claim 17 (depends on 1) The catheter device according to claim 1 wherein said functional element is selected from the group consisting of minimally invasive imaging probes, atherectomy devices, steering probes, energy-delivery devices for localized delivery of radiation, radiofrequency ablation, thermal energy, cooling probes, therapeutic ultrasound or light energy and minimally invasive surgical devices. ### Claim 18 (depends on 3) The catheter device according to claim 3 wherein said plurality of components spaced along said length of said rotational drive shaft are sufficient to damp vibrations of said functional element and said rotational drive shaft. ### Claim 19 (depends on 1) The catheter device according to claim 1 wherein said frictional component is configured to permit fluid flow between regions distal and proximal thereto while said frictional component is in contact with said inner surface of said elongate hollow sheath. ### Claim 20 (depends on 19) The catheter device according to claim 19 wherein said frictional component is further configured to permit fluid flow unidirectionally. ### Claim 21 (depends on 1) The catheter device according to claim 1 wherein the frictional force resulting from the frictional contact is effectively uniform at a given angular velocity. ### Claim 22 (depends on 1) The catheter device according to claim 1 wherein said frictional component is remote from the proximal end of the rotational drive shaft. ### Claim 23 (depends on 1) The catheter device according to claim 1 wherein the frictional component is proximate to the functional element.