US20140276936A1

US20140276936A1 - Active drive mechanism for simultaneous rotation and translation

Info

Publication number: US20140276936A1
Application number: US13/835,136
Authority: US
Inventors: Arkady Kokish; Francis MACNAMARA
Original assignee: Hansen Medical Inc
Current assignee: Hansen Medical Inc
Priority date: 2013-03-15
Filing date: 2013-03-15
Publication date: 2014-09-18
Also published as: US20170071684A1; EP2777594B1; EP2777594A2; US20200129252A1; US10524867B2; US11504195B2; EP2777594A3

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

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 of FIG. 1;

FIG. 3 is another exemplary illustration of an exemplary catheter assembly of the surgical system of FIG. 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 of FIG. 4;

FIG. 6 is a rear perspective view of the exemplary drive apparatus of FIG. 4, with a support plate removed;

FIG. 7 is a rear perspective view of a disposable device for the exemplary drive apparatus of FIG. 4, with the disposable device in an open position;

FIG. 8 is a rear perspective view of the split clamp assembly of FIG. 7, with the disposable device in a closed position;

FIG. 9 is a front perspective view of the disposable device of FIG. 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 of FIG. 4;

FIG. 11 is a section view of the exemplary drive mechanism taken through line 11-11 in FIG. 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 of FIG. 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 to FIG. 1, a robotically controlled surgical system 100 is illustrated in which an apparatus, a system, and/or method may be implemented according to various exemplary illustrations. System 100 may include a robotic catheter assembly 102 having a robotic or first or outer steerable complement, otherwise referred to as a sheath instrument 104 (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 instrument 106 (generally referred to as “catheter” or “catheter instrument”). Catheter assembly 102 is controllable using a robotic instrument driver 108 (generally referred to as “instrument driver”). During use, a patient is positioned on an operating table or surgical bed 110 (generally referred to as “operating table”) to which robotic instrument driver 108 may be coupled or mounted. In the illustrated example, system 100 includes an operator workstation 112, an electronics rack 114 and associated bedside electronics box (not shown), a setup joint mounting brace 116, and instrument driver 108. A surgeon is seated at operator workstation 112 and can monitor the surgical procedure, patient vitals, and control one or more catheter devices. Operator workstation 112 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 instrument 502 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 other suitable connectors 118 to provide for data communication, or one or more components may be equipped with wireless communication components to reduce or eliminate cables 118. 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 to FIG. 2, an exemplary instrument assembly 200 is shown, including sheath instrument 104 and the associated guide or catheter instrument 106 mounted to mounting plates 202, 204 on a top portion of instrument driver 108. During use, catheter instrument 106 is inserted within a central lumen of sheath instrument 104 such that instruments 104, 106 are arranged in a coaxial manner. Although instruments 104, 106 are arranged coaxially, movement of each instrument 104, 106 can be controlled and manipulated independently. For this purpose, motors within instrument driver 108 are controlled such that carriages coupled to each of the instruments 104, 160 may allow the instruments 104, 106 to be driven forwards and backwards along the driver 108, e.g., with mounting plates securing the instruments to the driver 108 on bearings. As a result, a catheter 300 coupled to guide catheter instrument 106 and sheath instrument 104 can be controllably manipulated while inserted into the patient, as will be further illustrated. Additional instrument driver 108 motors (not shown in FIG. 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 instrument 106 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 to FIG. 3, another exemplary instrument 109 is illustrated mounted on theexemplary instrument driver 108. The instrument 109 includes a cover 111 and a drive apparatus 400 partially extending out of the cover, as will be described further in regard to FIGS. 4-11. More specifically, as will be described further, the drive apparatus 400 may include a disposable portion 402 which extends out of the housing 111, while an associated drive mechanism (not seen in FIG. 3) remains within the housing 111. Accordingly, the drive mechanism (not shown in FIG. 3) may generally be reused for surgical procedures, while the disposable portion 402 may part of a sterile environment associated with a surgical procedure and may be disposed of afterwards. Moreover, as will be described further below the disposable portion 402 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 the drive mechanism 400 to properly “grip” the elongate member, and increasing cost-effectiveness of the system 100 overall.
During use the instrument 109 may be used to manipulate an elongate member included in the catheter assembly 102, e.g., a catheter guidewire (not shown in FIG. 3). Alternatively, the instrument 109 may be employed to manipulate a catheter sheath (not shown in FIG. 3). Although a single instrument 109 is illustrated in FIG. 3, in another exemplary illustration two instruments 109 may be employed in which a first instrument 109 is used to insert and roll a guidewire, which guidewire is inserted within a central lumen of a second instrument 109 (not shown in FIG. 3) such that the two instruments 109 are arranged in a coaxial manner, substantially as described above regarding the instruments 104, 106. Additionally, the instruments 109 may generally insert and rotate the associated elongate member, i.e., the guidewire and catheter sheath, independently, as described above regarding the instruments 104, 106. Accordingly, while the exemplary illustrations herein may generally focus on the insertion and rotation of a guidewire for a catheter, the instrument 109 may be used for insertion and rotation of any elongate member that is convenient.
Turning now to FIGS. 4-11, exemplary drive apparatus 400 is illustrated in further detail. As noted above, the drive apparatus 400 may include a disposable mechanism 402 for contacting and driving an elongate member, e.g., a guidewire or catheter. An associated drive mechanism 404 may generally be configured to be kept separate from the disposable mechanism 402, at least to an extent allowing the drive mechanism 404 to be kept out of a sterile environment associated with the elongate member and surgical procedure. As best seen in FIGS. 4-6, the disposable mechanism 402 may be supported between two idle rollers 421, 423, and a driving roller 425 which is configured to rotate the disposable mechanism 402 to impart rotational motion to the elongate member, as will be described further below. Moreover, the idle roller 421 may include a driving gear 422 for selectively imparting axial motion, i.e., insertion or retraction, of an elongate member, as will also be further described below.
The disposable portion 402 may include a roller assembly, e.g., comprising one or more rollers 483 that are configured to impart axial motion to the elongate member along a first continuous surface. For example, as best seen in FIG. 9, a roller 483 a and a second roller 483 b each define generally cylindrical surfaces 485 a, 485 b that are configured to maintain contact with the elongate member during axial motion, i.e., caused by rotation of the rollers 483. The drive apparatus 400 may further include a roller support configured to rotate the roller assembly, i.e., at least one of the rollers 483, thereby imparting rotational motion to the elongate member. For example, as will be described further below, the rollers 483 may generally be supported within the clamps 401, 403 of the disposable portion, e.g., via a saddle 474 or by the clamps 401, 403 themselves, such that the rollers 483 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 rollers 483 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 rollers 483 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 to FIG. 7, the disposable drive mechanism 402 may include a left clamp 401 and a right clamp 403, as best seen in FIG. 7. The left and right clamps 401, 403 may be connected to each other with a compliant member 482 configured to maintain the left and right clamps 401, 403 together in an open position as illustrated in FIG. 7. More specifically, in the open position the left and right clamps 401, 403 are held together along a lower portion and are spaced apart by a gap G along an upper portion of the clamps 401, 403. In one exemplary illustration, the compliant member 482 includes first and second memory wires 482 a, 482 b, e.g., nitinol wires, which generally act similar to a spring in holding the clamps together in the open configuration shown in FIG. 7. The memory wires 482 a, 482 b may generally provide a locating feature for the roller assembly, thereby generally positioning the rollers 483 a, 483 b within the clamps 401, 403, as best seen in FIG. 9.
Referring now to FIG. 9, the disposable mechanism 402 is illustrated with the left and right clamps 401, 403 (not shown in FIG. 9) removed. The disposable drive mechanism 402 includes a roller assembly, e.g., having one or more rollers 483 a, 483 b for imparting axial motion to the elongate member. As shown in FIG. 9, two rollers 483 a, 483 b may be configured to receive an elongate member (not shown in FIG. 9) therebetween. More specifically, the rollers 483 may each rotate about corresponding spindles 484 a, 484 b. Moreover, as will be described further below the rollers 483 a, 483 b may each have a plurality of geared teeth 478 a, 478 b which are meshingly engaged such that the rotation of the rollers 483 a, 483 b is generally coordinated. The rollers 483 a, 483 b may each be generally round, thereby defining respective continuous surfaces 485 a, 485 b about the generally cylindrical rollers 483 for engaging the elongate member. More specifically, an axial movement of any distance may be applied by the rollers 483 a, 483 b, since the rollers 483 a, 483 b may continuously turn about the spindles 484 without limitation. Accordingly, axial motion of the elongate member is not limited by any range of motion of any component of the drive apparatus 400, allowing the drive apparatus 400 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 or continuous surfaces 485 a, 485 b of the rollers 483 a, 483 b.
The roller assembly may be supported in a roller support configured to rotate the rollers about an axis perpendicular to the spindles 484 of the rollers 483. For example, the spindle 484 a of the roller 483 a may be supported in a saddle 474 that is engaged with an interior surface of one of the clamps 401, 403 (not shown in FIG. 9) by way of a plurality of springs 473. Radially inward movement of the saddle 474 away from the interior surface may be limited by stop pins 475, which may engage an interior side of the saddle 474 to generally limit radially inward movement of the saddle 474 and the roller 483 a, thereby limiting force applied by the roller 483 a to the elongate member when the elongate member is positioned between the rollers 483 a, 483 b. The spindle 484 b of the other roller 483 b may be supported in the corresponding one of the clamps 401, 403 (not shown in FIG. 9). Accordingly, the spindle 484 b may be generally fixed within the clamps 401, 403 while the spindle 484 a may be movable by way of the springs 473 to provide a clamping force upon the elongate member.
The disposable device 402 may further comprise gear halves 426 a, 426 b which define an inner toothed surface 489 engaging a drive pinion 477 (see FIGS. 7 and 8). The drive pinion 477 may be engaged with a worm gear 479 by way of worm 480, wherein the worm 480 is fixed for rotation with the drive pinion 477. A location shaft 481 may be provided to assist with locating the above components within the clamps 401, 403, as will be described further below. Additionally, a compliant element 482 may be provided which generally provides a spring force urging the clamps 401, 403 toward an open position, e.g., as seen in FIG. 7.
The driving mechanism 404, as best seen in FIGS. 10 and 11, may include a front plate 451 having a channel 490 through which an elongate member may be received during operation. The driving mechanism may further include a right idle roll rotational assembly 452 which corresponds to right idle roller 423 (see FIGS. 4-6). Additionally, a lever 453 is located on the front plate 451 by way of a pivot shaft 460, about which the lever 453 may be pivoted by way of a threaded member 454, which may be a driving screw. The driving mechanism 404 may include driving shafts 455 and 456, which may be received within corresponding drive mechanisms (not shown) associated with the instrument driver 108 supporting the instrument 109 (see FIG. 3). A driving roll rotational assembly 457 supports bevel gears 458 and 459, which are engaged to transfer rotational motion of the driving shaft 456 to driving roller 425 (see FIGS. 4 and 5). A left idle roll bushing 461 and driving gear bushing 463 may be supported in a housing 462 mounted to the support plate 451, as will be described further below.
The drive apparatus 400 may generally integrate a plurality of actuating mechanisms together. The drive apparatus 400 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, the clamps 401, 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 the drive apparatus 400. The drive apparatus may also include a mechanism for inserting and retracting the elongate member, i.e., in an axial direction. Moreover, the drive apparatus 400 also includes a mechanism for imparting rotational motion to the elongate member. Additionally, as will be described further below, the drive apparatus 400 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 surfaces 485 a, 485 b and the toothed gear engagement between the drive pinion 477 and gear halves 426 a, 426 b. 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 the drive apparatus 400 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 to FIGS. 6 and 7, the use and operation of the drive apparatus 400 will be described in further detail. Initially the drive apparatus 400 may be in the open position, i.e., where the disposable portion 402 defines a gap G between the clamps 401, 403 as best seen in FIG. 7. While the disposable portion 402 is in the open position, the elongate member, e.g., a guidewire or catheter (not shown in FIG. 6 or 7), may be placed between the rollers 483 a, 483 b supported from below by the compliant members 482. An end portion 425 a of driving roller 425 (see FIG. 6), may be located in the driving roll assembly 457 and can be moved up and down by rotation of the lever 453, which rotates about the pivot shaft 460, as best seen in FIG. 7. The lever 453 may be actuated by threaded member 454. Accordingly, the driving roller 425 may selectively open and close the disposable portion 402. More specifically, when the driving roller 425 is in an upper position as defined by the pivoting of the lever 453, the disposable portion 402 will be closed, as seen in FIG. 8. When the driving roller 425 is moved downward to a lower position, the driving roller 425 generally allows the compliant element 482 to urge the clamps 401, 403 apart at the upper portion, defining the gap G as best seen in FIG. 7. Upon movement of the driving roller 425 upward, the disposable portion 402 is forced to close. For example, an engagement portion 425 b of the driving roller 425 may come into contact with one or both clamps 401, 403, thereby forcing the clamps 401, 403 together at the upper portion, closing the gap G as seen in FIG. 8.
Upon closure of the disposable portion 402, the elongate member may be held between the rollers 483 a, 483 b with a force that is generally limited by springs 473, as best seen in FIG. 9. More specifically, the springs 483 may generally act upon an inner surface of one of the clamps 401, 403 (not shown in FIG. 9), urging the roller 483 a which is supported in the saddle 474 toward the other roller 483 b. Accordingly, a desired force of the rollers 483 a, 483 b may be adjusted based upon the spring force imparted by the springs 473.
Turning now to FIGS. 6 and 10, a rotational motion imparted by the drive apparatus 400 to an elongate member will be described in further detail. The roller 425 may be rotated via the shaft 456, e.g., though bevel gears 458 and 459, as best seen in FIG. 10. Rotation of the driving roller 425 in turn rotates the disposable portion 402 via friction between the engagement portion 425 b of the roller 425 and an outer surface 402 a of the disposable portion 402, as best seen in FIG. 6. Motion may be imparted to the disposable portion via other mechanisms as well. Merely as an example, motion may be transferred from the roller 425 to the disposable portion 402 with a using corresponding toothed surfaces on the roller 425 and the disposable portion 402, similar to a geared arrangement.
Turning now to FIGS. 9-11, the axial motion of the drive apparatus 400 is described in further detail. FIG. 11 illustrates a cross section of the holders for left idle roller 423 and driving gear 422 (see FIG. 3). More specifically, left idle roll 423 is located by bushing 461 and driving gear 422 is located by bushing 463. The bushing 463 may have a driving mechanism (not shown) for selectively rotating the driving gear 422. Rotation of the driving gear 422 (see FIG. 3), which is engaged with an outer toothed surface of gear halves426 a, 426 b, will thereby rotate the gear halves 426 a, 426 b. The gear halves 426 a, 426 b when in the closed position (i.e., as in FIG. 8) may form a gear that rotates in response to the driving gear 422 (see FIG. 6). The gear halves 426 a, 426 b in turnactuates gear 477 as best seen in FIGS. 7 and 8. The gear 477 is located on the worm 480, as illustrated in FIG. 9. Rotation of the worm 480 in turn drives worm gear 479. The worm gear 479 actuates one of the rollers 483 b. The other roller 483 a rotates in response to the roller 483 b, as they are connected with the corresponding gears478 a, 478 b. The surfaces485 a, 485 b of the rollers 483 a, 483 b may generally be designed to ensure substantially slipless contact with the elongate member, such that the turning of the rollers 483 a, 483 b imparts axial motion directly to the elongate member.
To enact simultaneous axial and rotational motion of the elongate member, shaft 456 (see FIG. 10) and drive gear 422 (see FIG. 6) may be driven simultaneously. Moreover, the instrument 109 may include interfaces for the shaft 456 and drive gear 422 that allow for selective rotation of each, facilitating independent axial and rotational motion. Rotational speeds of the components of the drive apparatus 400 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 to FIGS. 12A and 12B, another set of exemplary rollers 783 a, 783 b is illustrated with an elongate member 999, e.g., a guidewire. The rollers 783 a, 783 b may each define generally cylindrical continuous surfaces 785 a, 785 b, and may rotate about spindles 784 a, 784 b, e.g., similar to rollers 483 a, 483 b. Moreover, the rollers 783 a, 783 b may each define a plurality of upper teeth 799 a, 799 b, as well as a plurality of lower teeth 789 a, 798 b. The upper teeth 799 a of the roller 783 a may generally mesh with the upper teeth 799 b of the roller 783 b, and the lower teeth 798 a of the roller 783 a may generally mesh with the lower teeth 798 b of the roller 783 b, thereby generally preventing an elongate member received between the rollers 783 a, 783 b, e.g., guidewire 999, from slipping out between the rollers 783 a, 783 b. Moreover, the upper and lower teeth 799, 798 may still allow for top loading of an elongate member such as the guidewire 999. For example, at least one of the rollers 783 a, 783 b may be supported in a saddle, e.g., as described above regarding roller 483 a, which allows enough lateral displacement of the roller 783 a or 783 b to be moved to temporarily open a gap between the upper teeth 799 through which the elongate member can be laid between the rollers 783 a, 783 b.
Operator workstation 112, electronics rack 114 and/or drive apparatus 400 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., process 1300. 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.
The drive apparatus 400 may advantageously use disposable materials in the construction of the disposable mechanism 402, 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 the drive apparatus 400 during operation. The minimal length of the drive apparatus 400 may generally be due in part to the containment of the driving mechanisms of the disposable portion 402 within the clamps 401, 403. Additionally, the drive apparatus employs separate driving mechanisms, e.g., rollers 483 a, 483 b and the toothed gear engagement between the drive pinion 477 and gear halves 426 a, 426 b, that allow for independent control of the axial motion and rotational motion. Moreover, the drive apparatus mechanism 400 provides generally “infinite” motion due to the looped or round surfaces of the rollers 483 a, 483 b and the toothed gear engagement between the drive pinion 477 and gear halves 426 a, 426 b, 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 the drive apparatus 400. Finally, the split clamps 401, 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

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 of claim 1, further comprising a first continuous surface defined by a generally cylindrical roller included in the roller assembly.

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

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

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

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

10. The drive apparatus of claim 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 of claim 5, further comprising a drive pinion engaged with an inner toothed surface.

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

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

14. The drive apparatus of claim 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;

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

17. The drive apparatus of claim 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 of claim 15, further comprising a drive pinion engaged with an inner toothed surface.

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

20. The drive apparatus of claim 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.