the following description of the preferred embodiments of the present invention is merely illustrative in nature , and as such it does not limit in any way the present invention , its application , or uses . numerous modifications may be made by those skilled in the art without departing from the true spirit and scope of the invention . referring to the drawings , a medical device delivery system is depicted , with one of the preferred embodiments of the present invention being shown at 10 . the illustrated stent delivery catheter system 10 of course depicts only one of many different medical device delivery systems designs that are within the scope of the present invention . for clarity and convenience , the present detailed description will only describe such an example of a delivery system for stents . one possible medical device delivery system that may be used with the present invention is any appropriate system in which an outer sheath is provided , surrounding an inner shaft . a medical device may be carried within the outer sheath during delivery to a desired site for treatment , where the outer sheath may be retracted , while the inner shaft and medical device are held in place . the novel concept of the present invention may also be used for medical device delivery systems in which the motion of the operator to deploy the medical device is selected from any suitable possibility , including axial motion in the proximal direction or the distal direction , or a rotational motion , a trigger actuator , a gear mechanism , or any other type of actuator that may be preferred , depending upon a particular application . indeed , the present unique concept may be used for medical device delivery systems in which the medical device is deployed in any suitable manner , including retracting an outer sheath in a proximal direction or a distal direction , or uncovering a medical device in various ways , including withdrawing portions of outer sheath members in proximal and distal directions , simultaneously or sequentially . the present invention may provide several advantages individually , or any combination of such advantages , including for example : ( i ) single - handed operation of the medical device delivery system ; ( ii ) a mechanism providing leverage or mechanical advantage , to adjust or reduce the forces needed to operate the system ; ( iii ) improved accuracy in positioning the medical device during deployment ; ( iv ) a capability of holding the delivery system components in a fixed relative position during an intermediate point in deploying a medical device ; and ( v ) multiple operational modes of operation , including for example a first mode of fine and precise control of the deployment process , and a second mode of rapid and easy deployment . the particular embodiment 10 of the present invention selected for illustration in the drawings includes a handle , shown in detail in fig1 - 6 . a first and second main body housing 12 and 14 are arranged in a side - by - side configuration , as shown for example in fig1 . other components include inner and outer shaft members 16 and 18 respectively , an anchoring member 20 , a proximal hub 22 with an actuator or knob 24 and a corresponding flush lumen tube 26 and valve 28 , as well as a threaded base member 30 and a rotating finger ring 32 . the main body housings 12 and 14 each preferably have several gripping knurls 34 for providing a physician with a good gripping surface , a longitudinal slot 36 defining a channel for sliding the movable actuator 24 and limiting the extent of possible travel for the actuator 24 and proximal hub assembly 22 , a side opening 38 through which a physician can operate the rotating finger ring 32 , a proximal anchoring aperture 40 adapted to capture a portion of the anchoring member 20 , a distal shaft aperture 42 through which the inner and outer shaft members 16 and 18 extend , and several openings for receiving fasteners 44 to hold the main body housings 12 and 14 together . the main body housings 12 and 14 also define a circular annular bearing shelf or shoulder 46 . a distal surface of rotating finger ring 32 touches this shoulder 46 in an initial configuration , and rotation of the rotating finger ring 32 causes it to advance along threaded base 30 and press on shoulder 46 , resulting in very precise and sensitive withdrawing movement of outer shaft member 18 in a proximal direction . in the particular assembly shown in the drawings , main body housings 12 and 14 are held together by fasteners 44 . anchor aperture 40 fixedly receives anchor 20 , which is affixed to the proximal end of inner shaft member 16 . a proximal end of outer shaft member 18 is affixed to proximal hub 22 , with a flexible strain relief 48 protecting the joint . in the preferred initial configuration , proximal hub 22 is affixed to threaded base 30 , which rotatably carries rotating finger ring 32 , which bears on the shoulder 46 of main body housing 12 . the preferred dual operation of the present invention is accomplished by enabling movement of outer shaft member 18 with respect to inner shaft member 16 in two ways . first , by rotating the finger ring 32 to cause it to advance on threaded base 30 and press against shoulder 46 , such that the entire assembly of threaded base 30 , proximal hub 22 and outer shaft member 18 withdraw proximally with respect to main body housing 12 and 14 , and thus with respect to inner shaft member 16 . second , by simply grasping knob 24 and pulling or pushing it within slot 36 . the first method allows precise and sensitive adjustment , while the second method allows relatively large - scale and rapid movement . at the distal end of the medical device delivery system , shown in detail in fig7 - 9 , distal ends of the inner and outer shaft members 16 and 18 are depicted , as well as whatever medical device is selected , in this particular case a stent 50 . the stent 50 shown in the drawings is of the self - expanding type , and may be captured within a tubular capsule 52 affixed to outer shaft member 18 . the distal end of inner shaft member 16 may be provided with a flexible tapering distal tip 54 . at least a proximal annular stop 56 , and preferably also a distal annular ring 58 , are affixed to inner shaft member 16 . the stop 56 and ring 58 , as well as a distal marker 60 that may be provided , are preferably radiopaque . in addition , the inner shaft member 16 assembly , including anchor 20 , inner shaft member 16 and distal tip 54 , may preferably be provided with a through lumen adapted to receive a guidewire 62 . in operation , the medical device delivery system 10 is advanced via a body passageway , preferably along a guidewire 62 , until the stent 50 is located within a desired site for treatment . a physician gently rotates the finger ring 32 to slightly pull back outer shaft member 18 . at this point , a small portion of the stent 50 may expand slightly . the handle of the present invention comfortably holds the delivery system 10 in this intermediate configuration , allowing the physician time and flexibility of procedure to selectively optimize the position of the stent 50 within the desired site . this precise adjustment of the position of the stent 50 , before any portion of the stent 50 touches the body passage or vessel 64 in a manner that might inhibit further positional adjustment , is preferable . when the physician is satisfied with the positioning , the finger ring 32 may be further rotated to cause a distal end of the stent 50 to gently contact the vessel 64 . when such contact occurs , and the stent is expanded sufficiently to independently hold its position , it is desirable to rapidly and completely withdraw the outer shaft member 18 . to do so , the physician grasps the knob 24 and pulls it back along slot 36 . the outer shaft member 18 may thus be withdrawn as quickly as the physician wishes . various materials may be selected for the components of the present invention , including any material having the desirable performance characteristics . in the particular embodiment shown in the drawings , the inner and outer shaft members 16 and 18 , strain relief 48 , and distal tip 54 may be made of any biocompatible and suitably flexible yet sufficiently strong material , including polymers of various types . possible selections for such materials include nylons or polyamides , polyimides , polyethylenes , polyurethanes , polyethers , polyesters , etc . in the alternative , some portion or all of the inner and / or outer shaft member 16 , 18 may be formed of a flexible metal , including for example stainless steel or nitinol hypotube . the stent 50 , stop 56 , ring 58 , marker 60 are preferably made of any biocompatible material that is strong and rigid , including for example stainless steel , platinum , tungsten , etc . the components of the handle of the present invention are preferably made of a material that is strong and rigid , including for example inflexible polycarbonates , or even some metal components . of course , many different variations are included within the scope of the present invention . some of these variations or alternative embodiments include any possible arrangement of sizes , materials , and designs within the bounds of the following claims . it should be understood that an unlimited number of configurations for the present invention could be realized . the foregoing discussion describes merely exemplary embodiments illustrating the principles of the present invention , the scope of which is recited in the following claims . those skilled in the art will readily recognize from the description , claims , and drawings that numerous changes and modifications can be made without departing from the spirit and scope of the invention .
a system for delivering at least one medical device to a desired location for treatment , and then selectively deploy it in position , includes an improved handle . one of the possible features of the handle may be to selectively hold the delivery system components at any desired configuration during deployment and positioning of the medical device . another possible feature of the handle may be more than one mode of operation , in which the deployment of the medical device can selectively proceed at more than one speed .