US20140276936A1 - Active drive mechanism for simultaneous rotation and translation - Google Patents

Abstract

An exemplary drive apparatus is disclosed having a roller assembly configured to impart axial motion to the elongate member along a first continuous surface configured to maintain contact with the elongate member during axial motion. The drive apparatus may further include a roller support configured to rotate the roller assembly, thereby imparting rotational motion to the elongate member. The roller support may be configured to rotate the roller assembly about a second continuous surface configured to maintain contact with the roller support during rotational motion. Moreover, the roller assembly and roller support may be configured to impart axial and rotational motion independently of one another, such that a first one of the roller assembly and the roller support imparts their associated motion regardless of a presence or absence of motion by the other of the roller assembly and the roller support.

Description

BACKGROUND
• Robotic interventional systems and devices are well suited for performing minimally invasive medical procedures as opposed to conventional techniques wherein the patient's body cavity is open to permit the surgeon's hands access to internal organs. However, advances in technology have led to significant changes in the field of medical surgery such that less invasive surgical procedures, in particular, minimally invasive surgery (MIS), are increasingly popular.
• MIS is generally defined as surgery that is performed by entering the body through the skin, a body cavity, or an anatomical opening utilizing small incisions rather than large, open incisions in the body. With MIS, it is possible to achieve less operative trauma for the patient, reduced hospitalization time, less pain and scarring, reduced incidence of complications related to surgical trauma, lower costs, and a speedier recovery.
• Special medical equipment may be used to perform MIS procedures. Typically, a surgeon inserts small tubes or ports into a patient and uses endoscopes or laparoscopes having a fiber optic camera, light source, or miniaturized surgical instruments. Without a traditional large and invasive incision, the surgeon is not able to see directly into the patient. Thus, the video camera serves as the surgeon's eyes. The images of the interior of the body are transmitted to an external video monitor to allow a surgeon to analyze the images, make a diagnosis, visually identify internal features, and perform surgical procedures based on the images presented on the monitor.
• MIS devices and techniques have advanced to the point where an insertion and rolling motion of components of an elongated component such as a catheter instrument, e.g., a catheter sheath and associated guidewire, are generally controllable by selectively operating rollers or other mechanisms for generally gripping the component. Some known mechanisms use gripping devices capable of infinite motion for translation, e.g., a roller, may require complex catheter component loading procedures, or may not be compatible with replaceable components adapted for a sterile operating environment.
• Accordingly, there is a need in the art for systems and methods for inserting and rolling catheter components that address or solve the above problems.
SUMMARY
• An exemplary drive apparatus is disclosed having a roller assembly configured to impart axial motion to the elongate member along a first continuous surface configured to maintain contact with the elongate member during axial motion. The drive apparatus may further include a roller support configured to rotate the roller assembly, thereby imparting rotational motion to the elongate member. The roller support may be configured to rotate the roller assembly about a second continuous surface configured to maintain contact with the roller support during rotational motion. Moreover, the roller assembly and roller support may be configured to impart axial and rotational motion independently of one another, such that a first one of the roller assembly and the roller support imparts their associated motion regardless of a presence or absence of motion by the other of the roller assembly and the roller support.
BRIEF DESCRIPTION OF THE DRAWINGS
• While the claims are not limited to the illustrated embodiments, an appreciation of various aspects is best gained through a discussion of various examples thereof. Referring now to the drawings, illustrative embodiments are shown in detail. Although the drawings represent the embodiments, the drawings are not necessarily to scale and certain features may be exaggerated to better illustrate and explain an innovative aspect of an embodiment. Further, the embodiments described herein are not intended to be exhaustive or otherwise limiting or restricting to the precise form and configuration shown in the drawings and disclosed in the following detailed description. Exemplary embodiments of the present invention are described in detail by referring to the drawings as follows.
• FIG. 1 is an illustration of a robotically controlled surgical system, according to one exemplary illustration;
• FIG. 2 is an illustration of an exemplary catheter assembly of the surgical system ofFIG. 1;
• FIG. 3 is another exemplary illustration of an exemplary catheter assembly of the surgical system ofFIG. 1;
• FIG. 4 is a rear perspective view of an exemplary drive apparatus for an elongated member, e.g., a guidewire for a catheter;
• FIG. 5 is a front perspective view of the exemplary drive apparatus ofFIG. 4;
• FIG. 6 is a rear perspective view of the exemplary drive apparatus ofFIG. 4, with a support plate removed;
• FIG. 7 is a rear perspective view of a disposable device for the exemplary drive apparatus ofFIG. 4, with the disposable device in an open position;
• FIG. 8 is a rear perspective view of the split clamp assembly ofFIG. 7, with the disposable device in a closed position;
• FIG. 9 is a front perspective view of the disposable device ofFIG. 7, with the disposable device in an open position and shown without a split housing;
• FIG. 10 is a rear perspective view of a drive mechanism for the exemplary drive apparatus ofFIG. 4;
• FIG. 11 is a section view of the exemplary drive mechanism taken through line11-11 inFIG. 10;
• FIG. 12A is a perspective view of another roller assembly with an elongated member, according to an exemplary illustration; and
• FIG. 12B is a front perspective view of the exemplary roller assembly ofFIG. 12A.
DETAILED DESCRIPTION
• Referring now to the drawings, illustrative embodiments are shown in detail. Although the drawings represent the embodiments, the drawings are not necessarily to scale and certain features may be exaggerated to better illustrate and explain an innovative aspect of an embodiment. Further, the embodiments described herein are not intended to be exhaustive or otherwise limit or restrict the invention to the precise form and configuration shown in the drawings and disclosed in the following detailed description.
• Referring toFIG. 1, a robotically controlledsurgical system100 is illustrated in which an apparatus, a system, and/or method may be implemented according to various exemplary illustrations.System100 may include arobotic catheter assembly102 having a robotic or first or outer steerable complement, otherwise referred to as a sheath instrument104 (generally referred to as “sheath” or “sheath instrument”) and/or a second or inner steerable component, otherwise referred to as a robotic catheter or guide or catheter instrument106 (generally referred to as “catheter” or “catheter instrument”).Catheter assembly102 is controllable using a robotic instrument driver108 (generally referred to as “instrument driver”). During use, a patient is positioned on an operating table or surgical bed110 (generally referred to as “operating table”) to whichrobotic instrument driver108 may be coupled or mounted. In the illustrated example,system100 includes anoperator workstation112, anelectronics rack114 and associated bedside electronics box (not shown), a setupjoint mounting brace116, andinstrument driver108. A surgeon is seated atoperator workstation112 and can monitor the surgical procedure, patient vitals, and control one or more catheter devices.Operator workstation112 may include a computer monitor to display a three dimensional object, such as a catheter instrument or component thereof, e.g., a guidewire, catheter sheath. Moreover, catheter instrument502 may be displayed within or relative to a three dimensional space, such as a body cavity or organ, e.g., a chamber of a patient's heart. In one example, an operator uses a computer mouse to move a control point around the display to control the position of catheter instrument.
• System components may be coupled together via a plurality of cables or othersuitable connectors118 to provide for data communication, or one or more components may be equipped with wireless communication components to reduce or eliminatecables118. Communication between components may also be implemented over a network or over the interne. In this manner, a surgeon or other operator may control a surgical instrument while being located away from or remotely from radiation sources, thereby decreasing radiation exposure. Because of the option for wireless or networked operation, the surgeon may even be located remotely from the patient in a different room or building.
• Referring now toFIG. 2, anexemplary instrument assembly200 is shown, includingsheath instrument104 and the associated guide orcatheter instrument106 mounted tomounting plates202,204 on a top portion ofinstrument driver108. During use,catheter instrument106 is inserted within a central lumen ofsheath instrument104 such thatinstruments104,106 are arranged in a coaxial manner. Althoughinstruments104,106 are arranged coaxially, movement of eachinstrument104,106 can be controlled and manipulated independently. For this purpose, motors withininstrument driver108 are controlled such that carriages coupled to each of theinstruments104,160 may allow theinstruments104,106 to be driven forwards and backwards along thedriver108, e.g., with mounting plates securing the instruments to thedriver108 on bearings. As a result, acatheter300 coupled to guidecatheter instrument106 andsheath instrument104 can be controllably manipulated while inserted into the patient, as will be further illustrated.Additional instrument driver108 motors (not shown inFIG. 2) may be activated to control bending of the catheter as well as the orientation of the distal tips thereof, including tools mounted at the distal tip.Sheath catheter instrument106 is configured to move forward and backward for effecting an axial motion of the catheter, e.g., to insert and withdraw the catheter from a patient, respectively.
• Referring now toFIG. 3, anotherexemplary instrument109 is illustrated mounted ontheexemplary instrument driver108. Theinstrument109 includes acover111 and adrive apparatus400 partially extending out of the cover, as will be described further in regard toFIGS. 4-11. More specifically, as will be described further, thedrive apparatus400 may include adisposable portion402 which extends out of thehousing111, while an associated drive mechanism (not seen inFIG. 3) remains within thehousing111. Accordingly, the drive mechanism (not shown inFIG. 3) may generally be reused for surgical procedures, while thedisposable portion402 may part of a sterile environment associated with a surgical procedure and may be disposed of afterwards. Moreover, as will be described further below thedisposable portion402 may be formed of relatively cost-effective materials and may be of a generally small relative size, minimizing a length of the elongate member that must be allowed for thedrive mechanism400 to properly “grip” the elongate member, and increasing cost-effectiveness of thesystem100 overall.
• During use theinstrument109 may be used to manipulate an elongate member included in thecatheter assembly102, e.g., a catheter guidewire (not shown inFIG. 3). Alternatively, theinstrument109 may be employed to manipulate a catheter sheath (not shown inFIG. 3). Although asingle instrument109 is illustrated inFIG. 3, in another exemplary illustration twoinstruments109 may be employed in which afirst instrument109 is used to insert and roll a guidewire, which guidewire is inserted within a central lumen of a second instrument109 (not shown inFIG. 3) such that the twoinstruments109 are arranged in a coaxial manner, substantially as described above regarding theinstruments104,106. Additionally, theinstruments109 may generally insert and rotate the associated elongate member, i.e., the guidewire and catheter sheath, independently, as described above regarding theinstruments104,106. Accordingly, while the exemplary illustrations herein may generally focus on the insertion and rotation of a guidewire for a catheter, theinstrument109 may be used for insertion and rotation of any elongate member that is convenient.
• Turning now toFIGS. 4-11,exemplary drive apparatus400 is illustrated in further detail. As noted above, thedrive apparatus400 may include adisposable mechanism402 for contacting and driving an elongate member, e.g., a guidewire or catheter. An associateddrive mechanism404 may generally be configured to be kept separate from thedisposable mechanism402, at least to an extent allowing thedrive mechanism404 to be kept out of a sterile environment associated with the elongate member and surgical procedure. As best seen inFIGS. 4-6, thedisposable mechanism402 may be supported between twoidle rollers421,423, and a drivingroller425 which is configured to rotate thedisposable mechanism402 to impart rotational motion to the elongate member, as will be described further below. Moreover, theidle roller421 may include adriving gear422 for selectively imparting axial motion, i.e., insertion or retraction, of an elongate member, as will also be further described below.
• Thedisposable portion402 may include a roller assembly, e.g., comprising one or more rollers483 that are configured to impart axial motion to the elongate member along a first continuous surface. For example, as best seen inFIG. 9, aroller483aand asecond roller483beach define generallycylindrical surfaces485a,485bthat are configured to maintain contact with the elongate member during axial motion, i.e., caused by rotation of the rollers483. Thedrive apparatus400 may further include a roller support configured to rotate the roller assembly, i.e., at least one of the rollers483, thereby imparting rotational motion to the elongate member. For example, as will be described further below, the rollers483 may generally be supported within theclamps401,403 of the disposable portion, e.g., via asaddle474 or by theclamps401,403 themselves, such that the rollers483 may be rotated about an axis defined by the elongate member. Moreover, the roller support may be configured to rotate the roller assembly about a second continuous surface configured to maintain contact with the roller support during rotational motion, thereby permitting generally any magnitude of rotational motion. Moreover, the roller assembly and roller support may be configured to impart axial and rotational motion independently of one another, such that a first one of the roller assembly and the roller support imparts their associated motion regardless of a presence or absence of motion by the other of the roller assembly and the roller support. More specifically, as will be described further below the rollers483 may generally rotate about their respective spindles to provide axial motion, regardless of whether the spindles themselves are being rotated about the axis of the elongate member. It should be noted that while one set of rollers483 is shown, multiple sets of rollers could be incorporated, e.g., in series, to provide additional traction on the elongate member for axial and rotational movement thereof.
• Turning now toFIG. 7, thedisposable drive mechanism402 may include aleft clamp401 and aright clamp403, as best seen inFIG. 7. The left andright clamps401,403 may be connected to each other with acompliant member482 configured to maintain the left andright clamps401,403 together in an open position as illustrated inFIG. 7. More specifically, in the open position the left andright clamps401,403 are held together along a lower portion and are spaced apart by a gap G along an upper portion of theclamps401,403. In one exemplary illustration, thecompliant member482 includes first andsecond memory wires482a,482b, e.g., nitinol wires, which generally act similar to a spring in holding the clamps together in the open configuration shown inFIG. 7. Thememory wires482a,482bmay generally provide a locating feature for the roller assembly, thereby generally positioning therollers483a,483bwithin theclamps401,403, as best seen inFIG. 9.
• Referring now toFIG. 9, thedisposable mechanism402 is illustrated with the left andright clamps401,403 (not shown inFIG. 9) removed. Thedisposable drive mechanism402 includes a roller assembly, e.g., having one ormore rollers483a,483bfor imparting axial motion to the elongate member. As shown inFIG. 9, tworollers483a,483bmay be configured to receive an elongate member (not shown inFIG. 9) therebetween. More specifically, the rollers483 may each rotate about correspondingspindles484a,484b. Moreover, as will be described further below therollers483a,483bmay each have a plurality of gearedteeth478a,478bwhich are meshingly engaged such that the rotation of therollers483a,483bis generally coordinated. Therollers483a,483bmay each be generally round, thereby defining respectivecontinuous surfaces485a,485babout the generally cylindrical rollers483 for engaging the elongate member. More specifically, an axial movement of any distance may be applied by therollers483a,483b, since therollers483a,483bmay continuously turn about the spindles484 without limitation. Accordingly, axial motion of the elongate member is not limited by any range of motion of any component of thedrive apparatus400, allowing thedrive apparatus400 to provide an axial movement in either direction of any magnitude while maintaining constant contact with the elongate member, i.e., by way of the generally looped orcontinuous surfaces485a,485bof therollers483a,483b.
• The roller assembly may be supported in a roller support configured to rotate the rollers about an axis perpendicular to the spindles484 of the rollers483. For example, thespindle484aof theroller483amay be supported in asaddle474 that is engaged with an interior surface of one of theclamps401,403 (not shown inFIG. 9) by way of a plurality ofsprings473. Radially inward movement of thesaddle474 away from the interior surface may be limited by stop pins475, which may engage an interior side of thesaddle474 to generally limit radially inward movement of thesaddle474 and theroller483a, thereby limiting force applied by theroller483ato the elongate member when the elongate member is positioned between therollers483a,483b. Thespindle484bof theother roller483bmay be supported in the corresponding one of theclamps401,403 (not shown inFIG. 9). Accordingly, thespindle484bmay be generally fixed within theclamps401,403 while thespindle484amay be movable by way of thesprings473 to provide a clamping force upon the elongate member.
• Thedisposable device402 may further comprisegear halves426a,426bwhich define an innertoothed surface489 engaging a drive pinion477 (seeFIGS. 7 and 8). Thedrive pinion477 may be engaged with aworm gear479 by way ofworm480, wherein theworm480 is fixed for rotation with thedrive pinion477. Alocation shaft481 may be provided to assist with locating the above components within theclamps401,403, as will be described further below. Additionally, acompliant element482 may be provided which generally provides a spring force urging theclamps401,403 toward an open position, e.g., as seen inFIG. 7.
• Thedriving mechanism404, as best seen inFIGS. 10 and 11, may include afront plate451 having achannel490 through which an elongate member may be received during operation. The driving mechanism may further include a right idle rollrotational assembly452 which corresponds to right idle roller423 (seeFIGS. 4-6). Additionally, alever453 is located on thefront plate451 by way of apivot shaft460, about which thelever453 may be pivoted by way of a threadedmember454, which may be a driving screw. Thedriving mechanism404 may include drivingshafts455 and456, which may be received within corresponding drive mechanisms (not shown) associated with theinstrument driver108 supporting the instrument109 (seeFIG. 3). A driving rollrotational assembly457 supportsbevel gears458 and459, which are engaged to transfer rotational motion of the drivingshaft456 to driving roller425 (seeFIGS. 4 and 5). A leftidle roll bushing461 and drivinggear bushing463 may be supported in ahousing462 mounted to thesupport plate451, as will be described further below.
• Thedrive apparatus400 may generally integrate a plurality of actuating mechanisms together. Thedrive apparatus400 may include a mechanism for opening and closing to facilitate loading and unloading of an elongate member, e.g., a guidewire or a catheter. As will be described further below, theclamps401,403 may generally be opened to allow top loading of an elongate member, and may thereby facilitate loading of the elongate member without requiring threading the elongate member axially through thedrive apparatus400. The drive apparatus may also include a mechanism for inserting and retracting the elongate member, i.e., in an axial direction. Moreover, thedrive apparatus400 also includes a mechanism for imparting rotational motion to the elongate member. Additionally, as will be described further below, thedrive apparatus400 may provide axial motion and rotational motion simultaneously, and in an “infinite” manner. More specifically, as will be seen below the insertion and rotational motion is provided by continuous drive surfaces, e.g., the generally round or looped roller surfaces485a,485band the toothed gear engagement between thedrive pinion477 andgear halves426a,426b. Accordingly, a generally continuous axial or rotational motion may be provided without releasing the elongate member during the motion. In other words, the rotational and insertion motions are not limited by any range of motion of thedrive apparatus400 or components thereof. Moreover, the rotational and axial motion may be provided independent of the other, i.e., one of or both of the rotational and axial motion may be applied to the elongate member at any given time.
• Referring now toFIGS. 6 and 7, the use and operation of thedrive apparatus400 will be described in further detail. Initially thedrive apparatus400 may be in the open position, i.e., where thedisposable portion402 defines a gap G between theclamps401,403 as best seen inFIG. 7. While thedisposable portion402 is in the open position, the elongate member, e.g., a guidewire or catheter (not shown inFIG. 6 or7), may be placed between therollers483a,483bsupported from below by thecompliant members482. Anend portion425aof driving roller425 (seeFIG. 6), may be located in the drivingroll assembly457 and can be moved up and down by rotation of thelever453, which rotates about thepivot shaft460, as best seen inFIG. 7. Thelever453 may be actuated by threadedmember454. Accordingly, the drivingroller425 may selectively open and close thedisposable portion402. More specifically, when the drivingroller425 is in an upper position as defined by the pivoting of thelever453, thedisposable portion402 will be closed, as seen inFIG. 8. When the drivingroller425 is moved downward to a lower position, the drivingroller425 generally allows thecompliant element482 to urge theclamps401,403 apart at the upper portion, defining the gap G as best seen inFIG. 7. Upon movement of the drivingroller425 upward, thedisposable portion402 is forced to close. For example, an engagement portion425bof the drivingroller425 may come into contact with one or bothclamps401,403, thereby forcing theclamps401,403 together at the upper portion, closing the gap G as seen inFIG. 8.
• Upon closure of thedisposable portion402, the elongate member may be held between therollers483a,483bwith a force that is generally limited bysprings473, as best seen inFIG. 9. More specifically, the springs483 may generally act upon an inner surface of one of theclamps401,403 (not shown inFIG. 9), urging theroller483awhich is supported in thesaddle474 toward theother roller483b. Accordingly, a desired force of therollers483a,483bmay be adjusted based upon the spring force imparted by thesprings473.
• Turning now toFIGS. 6 and 10, a rotational motion imparted by thedrive apparatus400 to an elongate member will be described in further detail. Theroller425 may be rotated via theshaft456, e.g., thoughbevel gears458 and459, as best seen inFIG. 10. Rotation of the drivingroller425 in turn rotates thedisposable portion402 via friction between the engagement portion425bof theroller425 and anouter surface402aof thedisposable portion402, as best seen inFIG. 6. Motion may be imparted to the disposable portion via other mechanisms as well. Merely as an example, motion may be transferred from theroller425 to thedisposable portion402 with a using corresponding toothed surfaces on theroller425 and thedisposable portion402, similar to a geared arrangement.
• Turning now toFIGS. 9-11, the axial motion of thedrive apparatus400 is described in further detail.FIG. 11 illustrates a cross section of the holders for leftidle roller423 and driving gear422 (seeFIG. 3). More specifically, leftidle roll423 is located by bushing461 and drivinggear422 is located by bushing463. Thebushing463 may have a driving mechanism (not shown) for selectively rotating thedriving gear422. Rotation of the driving gear422 (seeFIG. 3), which is engaged with an outer toothed surface of gear halves426a,426b, will thereby rotate the gear halves426a,426b. The gear halves426a,426bwhen in the closed position (i.e., as inFIG. 8) may form a gear that rotates in response to the driving gear422 (seeFIG. 6). The gear halves426a,426binturnactuates gear477 as best seen inFIGS. 7 and 8. Thegear477 is located on theworm480, as illustrated inFIG. 9. Rotation of theworm480 in turn drivesworm gear479. Theworm gear479 actuates one of therollers483b. Theother roller483arotates in response to theroller483b, as they are connected with the corresponding gears478a,478b. The surfaces485a,485bof therollers483a,483bmay generally be designed to ensure substantially slipless contact with the elongate member, such that the turning of therollers483a,483bimparts axial motion directly to the elongate member.
• To enact simultaneous axial and rotational motion of the elongate member, shaft456 (seeFIG. 10) and drive gear422 (seeFIG. 6) may be driven simultaneously. Moreover, theinstrument109 may include interfaces for theshaft456 and drivegear422 that allow for selective rotation of each, facilitating independent axial and rotational motion. Rotational speeds of the components of thedrive apparatus400 can be optimized as needed to suit any given application, e.g., by altering the interfaces between the various rotational parts, e.g., by adjusting the geared arrangements to ensure reasonable rotational speeds of the components based upon typical axial and rotational movement for the given application.
• Turning now toFIGS. 12A and 12B, another set ofexemplary rollers783a,783bis illustrated with anelongate member999, e.g., a guidewire. Therollers783a,783bmay each define generally cylindricalcontinuous surfaces785a,785b, and may rotate aboutspindles784a,784b, e.g., similar torollers483a,483b. Moreover, therollers783a,783bmay each define a plurality ofupper teeth799a,799b, as well as a plurality oflower teeth789a,798b. Theupper teeth799aof theroller783amay generally mesh with theupper teeth799bof theroller783b, and thelower teeth798aof theroller783amay generally mesh with thelower teeth798bof theroller783b, thereby generally preventing an elongate member received between therollers783a,783b, e.g., guidewire999, from slipping out between therollers783a,783b. Moreover, the upper and lower teeth799,798 may still allow for top loading of an elongate member such as theguidewire999. For example, at least one of therollers783a,783bmay be supported in a saddle, e.g., as described above regardingroller483a, which allows enough lateral displacement of theroller783aor783bto be moved to temporarily open a gap between the upper teeth799 through which the elongate member can be laid between therollers783a,783b.
• Operator workstation112, electronics rack114 and/or driveapparatus400 may include a computer or a computer readable storage medium implementing the operation of drive and implementing the various methods and processes described herein, e.g., process1300. In general, computing systems and/or devices, such as the processor and the user input device, may employ any of a number of computer operating systems, including, but by no means limited to, versions and/or varieties of the Microsoft Windows® operating system, the Unix operating system (e.g., the Solaris® operating system distributed by Oracle Corporation of Redwood Shores, Calif.), the AIX UNIX operating system distributed by International Business Machines of Armonk, N.Y., the Linux operating system, the Mac OS X and iOS operating systems distributed by Apple Inc. of Cupertino, Calif., and the Android operating system developed by the Open Handset Alliance.
• Computing devices generally include computer-executable instructions, where the instructions may be executable by one or more computing devices such as those listed above. Computer-executable instructions may be compiled or interpreted from computer programs created using a variety of programming languages and/or technologies, including, without limitation, and either alone or in combination, Java™, C, C++, Visual Basic, Java Script, Perl, etc. In general, a processor (e.g., a microprocessor) receives instructions, e.g., from a memory, a computer-readable medium, etc., and executes these instructions, thereby performing one or more processes, including one or more of the processes described herein. Such instructions and other data may be stored and transmitted using a variety of computer-readable media.
• A computer-readable medium (also referred to as a processor-readable medium) includes any non-transitory (e.g., tangible) medium that participates in providing data (e.g., instructions) that may be read by a computer (e.g., by a processor of a computer). Such a medium may take many forms, including, but not limited to, non-volatile media and volatile media. Non-volatile media may include, for example, optical or magnetic disks and other persistent memory. Volatile media may include, for example, dynamic random access memory (DRAM), which typically constitutes a main memory. Such instructions may be transmitted by one or more transmission media, including coaxial cables, copper wire and fiber optics, including the wires that comprise a system bus coupled to a processor of a computer. Common forms of computer-readable media include, for example, a floppy disk, a flexible disk, hard disk, magnetic tape, any other magnetic medium, a CD-ROM, DVD, any other optical medium, punch cards, paper tape, any other physical medium with patterns of holes, a RAM, a PROM, an EPROM, a FLASH-EEPROM, any other memory chip or cartridge, or any other medium from which a computer can read.
• Databases, data repositories or other data stores described herein may include various kinds of mechanisms for storing, accessing, and retrieving various kinds of data, including a hierarchical database, a set of files in a file system, an application database in a proprietary format, a relational database management system (RDBMS), etc. Each such data store is generally included within a computing device employing a computer operating system such as one of those mentioned above, and are accessed via a network in any one or more of a variety of manners. A file system may be accessible from a computer operating system, and may include files stored in various formats. An RDBMS generally employs the Structured Query Language (SQL) in addition to a language for creating, storing, editing, and executing stored procedures, such as the PL/SQL language mentioned above.
• In some examples, system elements may be implemented as computer-readable instructions (e.g., software) on one or more computing devices (e.g., servers, personal computers, etc.), stored on computer readable media associated therewith (e.g., disks, memories, etc.). A computer program product may comprise such instructions stored on computer readable media for carrying out the functions described herein.
• Thedrive apparatus400 may advantageously use disposable materials in the construction of thedisposable mechanism402, e.g., an injection molded plastic material. Additionally, the disposable mechanism is relatively short in an axial direction associated with the elongate member, minimizing wasted length, i.e., the portion of the elongate member that must be gripped or held by thedrive apparatus400 during operation. The minimal length of thedrive apparatus400 may generally be due in part to the containment of the driving mechanisms of thedisposable portion402 within theclamps401,403. Additionally, the drive apparatus employs separate driving mechanisms, e.g.,rollers483a,483band the toothed gear engagement between thedrive pinion477 andgear halves426a,426b, that allow for independent control of the axial motion and rotational motion. Moreover, thedrive apparatus mechanism400 provides generally “infinite” motion due to the looped or round surfaces of therollers483a,483band the toothed gear engagement between thedrive pinion477 andgear halves426a,426b, thereby allowing for application of any magnitude of axial or rotational motion without having to release the elongate member. Accordingly, axial and rotational motion of the elongate member are not limited by any range of motion of thedrive apparatus400. Finally, the split clamps401,403 of the disposable portion allows for top loading of the elongate member, such that the elongate member need not be threaded through the drive mechanism during installation of the elongate member.
• The exemplary illustrations are not limited to the previously described examples. Rather, a plurality of variants and modifications are possible, which also make use of the ideas of the exemplary illustrations and therefore fall within the protective scope. Accordingly, it is to be understood that the above description is intended to be illustrative and not restrictive.
• With regard to the processes, systems, methods, heuristics, etc. described herein, it should be understood that, although the steps of such processes, etc. have been described as occurring according to a certain ordered sequence, such processes could be practiced with the described steps performed in an order other than the order described herein. It further should be understood that certain steps could be performed simultaneously, that other steps could be added, or that certain steps described herein could be omitted. In other words, the descriptions of processes herein are provided for the purpose of illustrating certain embodiments, and should in no way be construed so as to limit the claimed invention.
• Accordingly, it is to be understood that the above description is intended to be illustrative and not restrictive. Many embodiments and applications other than the examples provided would be upon reading the above description. The scope of the invention should be determined, not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. It is anticipated and intended that future developments will occur in the arts discussed herein, and that the disclosed systems and methods will be incorporated into such future embodiments. In sum, it should be understood that the invention is capable of modification and variation and is limited only by the following claims.
• All terms used in the claims are intended to be given their broadest reasonable constructions and their ordinary meanings as understood by those skilled in the art unless an explicit indication to the contrary in made herein. In particular, use of the singular articles such as “a,” “the,” “the,” etc. should be read to recite one or more of the indicated elements unless a claim recites an explicit limitation to the contrary.

Claims (20)

1. A drive apparatus for an elongated member, comprising:

a roller assembly configured to impart axial motion to the elongate member; and

a roller support configured to rotate the roller assembly, thereby imparting rotational motion to the elongate member;

wherein the roller assembly and roller support are configured to impart axial and rotational motion independently of one another, such that a first one of the roller assembly and the roller support imparts their associated motion regardless of a presence or absence of motion by the other of the roller assembly and the roller support.

2. The drive apparatus ofclaim 1, further comprising a first continuous surface defined by a generally cylindrical roller included in the roller assembly.

3. The drive apparatus ofclaim 2, wherein the roller support is configured to rotate about a second generally continuous surface.

4. The drive apparatus ofclaim 1 wherein the roller assembly is configured to maintain continuous grip of the elongate member in the axial and rotational direction.

5. The drive apparatus ofclaim 1, further comprising a pair of clamps selectively surrounding the roller assembly and the roller support.

6. The drive apparatus ofclaim 5, wherein the clamps selectively open to define a gap along an upper portion of the drive apparatus, allowing the elongate member to be received through the gap and within the rollers in a direction parallel to an axis of rotation of the rollers.

7. The drive apparatus ofclaim 5, further comprising a driving roller supported in a support plate defining a channel configured to receive the elongated member when the elongated member is disposed in the roller assembly, the driving roller configured to rotate the clamps.

8. The drive apparatus ofclaim 5, further comprising a saddle supporting the roller assembly within a housing defined by the pair of clamps.

9. The drive apparatus ofclaim 1, wherein the roller assembly includes a pair of opposing rollers.

10. The drive apparatus ofclaim 9, wherein the opposing rollers are engaged via a plurality of mating teeth, thereby coordinating a turning of the opposing rollers.

11. The drive apparatus ofclaim 5, further comprising a drive pinion engaged with an inner toothed surface.

12. The drive apparatus ofclaim 11, wherein the drive pinion is configured to rotate the first continuous surface about a spindle.

13. The drive apparatus ofclaim 1, further comprising a drive mechanism and a disposable portion including the roller assembly and the roller support.

14. The drive apparatus ofclaim 13, wherein the drive mechanism defines at least a portion of a sterile barrier with respect to the disposable portion.

15. A drive apparatus for an elongated member, comprising:

a roller assembly configured to impart axial motion to the elongate member along a first continuous surface configured to maintain contact with the elongate member during axial motion;

a roller support configured to rotate the roller assembly, thereby imparting rotational motion to the elongate member, the roller support configured to rotate the roller assembly about a second continuous surface configured to maintain contact with the roller support during rotational motion; and

a pair of clamps selectively surrounding the roller assembly and the roller support;

wherein the roller assembly and roller support are configured to impart axial and rotational motion independently of one another, such that a first one of the roller assembly and the roller support imparts their associated motion regardless of a presence or absence of motion by the other of the roller assembly and the roller support.

16. The drive apparatus ofclaim 15, wherein the first continuous surface is defined by a generally cylindrical roller included in the roller assembly.

17. The drive apparatus ofclaim 15, wherein the clamps selectively open to define a gap along an upper portion of the drive apparatus, allowing the elongate member to be received through the gap and within the rollers in a direction parallel to an axis of rotation of the rollers.

18. The drive apparatus ofclaim 15, further comprising a drive pinion engaged with an inner toothed surface.

19. The drive apparatus ofclaim 18, wherein the drive pinion is configured to rotate the first continuous surface about a spindle.

20. The drive apparatus ofclaim 15, further comprising a drive mechanism and a disposable portion including the roller assembly and the roller support, wherein the drive mechanism defines at least a portion of a sterile barrier with respect to the disposable portion.

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