The patent's assignee is
News editors obtained the following quote from the background information supplied by the inventors: "The present invention relates to devices used to implant medical devices within a patient's vasculature.
"It is known to deliver various implantable medical devices to a patient's vasculature. Typically, an implantable device is delivered to a treatment site (such as coronary artery, carotid artery, etc.) by locating the device near the distal end of a suitable catheter. The catheter can then be percutaneously introduced and guided to the deliver site where the device is then delivered.
"Known implantable medical devices include, for example, stents and stent grafts (hereinafter collectively 'stents'). Stents can be loaded on a balloon and delivered to the treatment site by inflating and then deflating the balloon. After balloon deflation the catheter can be withdrawn, leaving the stent implanted at the treatment site.
"Another form of stents include the known 'self-expanding' stents. Such stents are loaded onto the distal end of a catheter and delivered to the treatment site in a compressed state. Typically the stent is held in the compressed state by an outer sheath or tubular member. To deliver the stent the outer sheath, or tubular member, is, typically, withdrawn proximally along the catheter, thus allowing the stent to self-expand.
"One means for withdrawing the sheath or tubular member is to provide the sheath or tubular member with a deployment line that extends proximally for the length of the catheter so that the physician can grasp the deployment line by hand. Upon locating the stent at the delivery site, the physician then slowly pulls back the deployment line, thereby gradually removing the sheath or tubular member and, thus, allowing the stent to self-expand.
"A further means for withdrawing the sheath or tubular member includes providing the sheath or tubular member with a deployment line that extends proximally along the length of the catheter and into a suitable hand-held device. The deployment line can be retracted by operating a suitable mechanical device, such as that disclosed in US Patent Application Publication Number 2004/0006380 A1, in the names of Buck, et al. The device disclosed in the Buck et al. document includes a tubular member compressing the stent. The tubular member is capable of being retracted at a constant rate by rotating a knob at a constant rate. As the tubular member is retracted, the stent self-expands and is thus deployed.
"One potential problem with the above-described delivery systems is that while retracting the outer sheath or tubular member at a relatively constant rate, it is common for the self-expanding stent to jump or slip out distally of the sheath or tubular member, thus causing poor stent placement or perhaps damage to the patient's vasculature.
"Accordingly, it is a purpose of the present invention to overcome such shortcomings by providing a device that will allow for more accurate placement of implantable devices."
As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventor's summary information for this patent application: "A device for retracting a deployment line of a remotely deployable implantable device comprising: a deployment line adapted to effect deployment of the remotely deployable implantable device; a control component for actuating the deployment line; an actuation mechanism for translating constant-rate actuation of the control component into variable rate retraction of the deployment line from the remotely deployable implantable device.
DESCRIPTION OF THE DRAWINGS The operation of the present invention should become apparent from the following description when considered in conjunction with the accompanying drawings, in which:
"FIG. 1 is an exploded view of a device according to the present invention;
"FIG. 2 is a perspective view of a device according to the present invention;
"FIGS. 3A-3F show loading a deployment line onto a device according to the present invention;
"FIG. 4 is a side view of a device according to the present invention; and
"FIG. 5 shows the proximal side of a removable nose cone according to an aspect of the invention."
For additional information on this patent application, see: Loewen,
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