News Column

"Elongate Medical Device Handle Autolock" in Patent Application Approval Process

September 4, 2014



By a News Reporter-Staff News Editor at Politics & Government Week -- A patent application by the inventors Blaskowski, Stacie Marie (St. Louis Park, MN); Anderson, Steven Andreas (Shakopee, MN), filed on February 12, 2013, was made available online on August 21, 2014, according to news reporting originating from Washington, D.C., by VerticalNews correspondents.

This patent application is assigned to St. Jude Medical, Atrial Fibrillation Division Inc .

The following quote was obtained by the news editors from the background information supplied by the inventors: "a. Technical Field

"The instant disclosure relates to handle assemblies for elongate medical devices, including interior components of a handle assembly for resisting deflection of the shaft of the medical device.

"b. Background Art

"Catheters are used for an ever-growing number of procedures. For example, catheters are used for diagnostic, therapeutic, and ablative procedures, to name just a few examples. Typically, the catheter is manipulated through the patient's vasculature and to the intended site, for example, a site within the patient's heart. The catheter typically carries one or more electrodes, which may be used for ablation, diagnosis, or the like. Often, another medical device, called an introducer or sheath, is used to position a catheter within the heart.

"To increase the ability to move and navigate an introducer or catheter within a patient's body, steerable introducers and catheters have been designed. Such steerable devices often have a steering mechanism near the distal end of the device. This steering mechanism typically includes a pull ring and one or more pull wires (or deflection wires) attached thereto and extending proximally towards an actuator that can place the wire or wires in tension. Placing a pull wire in tension may cause the distal end of the device to deflect in at least one plane. In this fashion, the introducer and/or catheter can be navigated through the tortuous path of a patient's vasculature to a target site.

"The foregoing discussion is intended only to illustrate the present field and should not be taken as a disavowal of claim scope."

In addition to the background information obtained for this patent application, VerticalNews journalists also obtained the inventors' summary information for this patent application: "An embodiment of a handle assembly for a catheter that may reduce the weight and/or expense of a traditional catheter handle may include an exterior adjusting knob extending along a longitudinal axis and configured to rotate about the axis, an insert, and a dowel pin. The insert may be configured to engage the adjusting knob and to rotate about the axis responsive to rotation of the adjusting knob. The insert may comprise an annular groove configured to engage a dowel pin, the annular groove comprising a sidewall comprising a chamfer. The dowel pin may be configured to engage the annular groove to resist rotation of the insert. In an embodiment, the insert may comprise plastic or polymer.

"Another embodiment of a handle assembly may include an exterior adjusting knob extending along a longitudinal axis and configured to rotate about the axis, a polymer or plastic insert, and a dowel pin. The insert may be configured to engage the adjusting knob and to rotate about the axis responsive to rotation of the adjusting knob. The insert may comprise an annular groove configured to engage a dowel pin. The dowel pin may be configured to engage the annular groove to resist rotation of the insert when no external force is applied to the adjusting knob, wherein the insert is configured to rotate relative to the dowel pin when an external force is applied to the adjusting knob.

"An embodiment of an elongate medical device may comprise a shaft and a handle assembly. The shaft may comprise a distal end portion, a proximal end portion, a longitudinal axis extending through the distal and proximal end portions, and a pull wire coupled to the distal end portion configured to deflect the distal end portion. The handle assembly may be coupled to the proximal end portion of the shaft and may comprise an exterior adjusting knob extending along the axis and configured to rotate about the axis, an insert, and a dowel pin. The insert may be configured to engage the adjusting knob and to rotate about the axis responsive to rotation of the adjusting knob. The insert may comprise an annular groove configured to engage a dowel pin. The annular groove may comprise a sidewall, wherein rotation of the insert applies a tensile force to the pull wire to deflect the shaft distal end portion. The dowel pin may be configured to engage the annular groove to resist rotation of the insert. The shaft and handle assembly may be configured to allow another medical device to be passed therethrough.

BRIEF DESCRIPTION OF THE DRAWINGS

"FIG. 1 is a diagrammatic view of an embodiment of an elongate medical device disposed in the body of a patient.

"FIG. 2 is an isometric view of an embodiment of an elongate medical device.

"FIG. 3 is an exploded isometric view of an embodiment of the handle assembly of the elongate medical device of FIG. 2.

"FIG. 4 is an enlarged isometric view of an embodiment of a clip subassembly of the handle assembly of FIG. 3.

"FIG. 5 is a side view of the clip subassembly of FIG. 4.

"FIG. 6 is an exploded isometric view of an embodiment of the interior assembly of the handle assembly of FIG. 3.

"FIG. 7 is a cross-sectional view of the interior assembly illustrated in FIG. 6.

"FIG. 8 is an enlarged side view of an embodiment of a dowel pin of the interior assembly of FIG. 6.

"FIG. 9 is a cross-sectional view of the interior assembly illustrated in FIG. 6.

"FIG. 10 is an enlarged view of a portion of FIG. 9.

"FIG. 11 is an end view of an embodiment of the bushing and adjustment knob insert of the interior assembly of FIG. 6.

"FIG. 12 is an enlarged isometric view of the bushing of FIGS. 6, 7, 9, and 10.

"FIG. 13 is a cross-sectional view of the bushing of FIGS. 6, 7, 9, and 10.

"FIGS. 14A and 14B are side views of a first embodiment of an adjustment knob insert that may be a part of the interior assembly of FIGS. 3, 6, 7, 9, and 10.

"FIGS. 15A and 15B are side views of a second embodiment of an adjustment knob insert that may be a part of the interior assembly of FIGS. 3, 6, 7, 9, and 10.

"FIG. 16 is an isometric view of an embodiment of slider blocks that may be a part of the interior assembly of FIGS. 3, 6, 7, 9, and 10.

"FIG. 17A is a plot illustrating the load capacity of an exemplary interior assembly including the first adjustment knob insert embodiment shown in FIGS. 14A and 14B.

"FIG. 17B is a plot illustrating the load capacity of an exemplary interior assembly including the second adjustment knob insert embodiment shown in FIGS. 15A and 15B."

URL and more information on this patent application, see: Blaskowski, Stacie Marie; Anderson, Steven Andreas. Elongate Medical Device Handle Autolock. Filed February 12, 2013 and posted August 21, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=1294&p=26&f=G&l=50&d=PG01&S1=20140814.PD.&OS=PD/20140814&RS=PD/20140814

Keywords for this news article include: Atrial Fibrillation Division Inc ., St. Jude Medical Atrial Fibrillation Division Inc.

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Source: Politics & Government Week


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