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Magnetically guided atherectomy

Inactive Publication Date: 2002-02-14
STEREOTAXIS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008] The application of external fields and gradients allows the physician to control the orientation and location of the distal tip of the catheter in the vessel at the treatment site. This permits the use of small and potentially single size catheters to treat either partial or total occlusions in the vasculature. In operation the device is moved to various treatment sites or locations in a vessel under the guidance of the MSS. The methods of the invention may be partially automated in the sense that the physician can image the current location of the device and program a desired location with the MSS and designate a location or orientation of the device in a vessel. The MSS system can provide feedback to the physician to help the physician direct the device as "planned" with the MSS workstation. Robotic control of the device is also contemplated wherein the motion of the device in the vessel is entirely under software control. In this instance physician observation and transducer feedback manages the procedure.

Problems solved by technology

Although balloon angioplasty is probably the most common procedure, there are several drawbacks to this type of device.
One problem is that the vascular occlusion must first be crossed with a guide wire to position the balloon.
If the vessel is totally occluded the wire cannot cross the lesion and therefore cannot be used to guide the balloon.

Method used

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Examples

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second embodiment

[0059] a magnetically guided atherectomy device is indicated generally as 400 in FIGS. 14-16. The magnetically guided atherectomy device 400 comprises an elongate catheter 402, having a proximal end (not shown) and a distal end 406, with a lumen 408 therebetween. The catheter 402 can be made of any flexible, biocompatible material conventionally used for medical catheters, for example Pebax.

[0060] A support 410 is mounted in the lumen adjacent the distal end 406. This support 410 can be permanently affixed within the catheter 402, with only the distal portion of the support projecting beyond the distal end 406 of the catheter. The support 410 is preferably made of a transparent, biocompatible material, such as polyethylene, polycarbonate, Pebax, or other suitable material. The support 410 includes passages for the ablation electrode conductor, and imaging, and preferably also includes compartments for receiving magnet body as described in more detail below.

[0061] The magnetically gu...

third embodiment

[0066] a magnetically guided atherectomy device is indicated generally as 500 in FIGS. 17-19. The magnetically guided atherectomy device 500 comprises an elongate catheter 502, having a proximal end (not shown) and a distal end 506, with a plurality of lumens 508 therebetween. The catheter 502 can be made of any flexible, biocompatible material conventionally used for medical catheters, for example Pebax, and is preferably transparent.

[0067] There is a disc-shaped electrode 510 on the distal end of the catheter 502. The electrode 510 has an opening 512 therein, generally transverse to the plane of the disc. A conduit 514 can extend through a generally central passageway 516 in the catheter 502 and through the opening 512 in the electrode 510, to make an electrical connection with the electrode, and provide energy to the electrode 510 for ablating atheramatous material that the electrode contacts. In this preferred embodiment the conduit 514 can be extended relative to the distal end...

fourth embodiment

[0074] a magnetically guided atherectomy device is indicated generally as 600 in FIGS. 20-21. The magnetically guided atherectomy device 600 comprises an elongate catheter 602, having a proximal end (not shown) and a distal end 606, with at least one lumen 608 therebetween. The catheter 602 can be made of any flexible, biocompatible material conventionally used for medical catheters, for example Pebax, and is preferably transparent.

[0075] There is a dome-shaped cutting head 610 on the distal end of the elongate catheter 602. The cutting head 610 has a centrally opening an annular cutting edge 612 aligned with the lumen of the catheter. The smooth, dome shape allows distal end of the device to be manipulated within the blood vessel without damaging the inside structure of the blood vessels. The opening allows material that has been cored from the blood vessel to pass through the cutting head 610 to the lumen of the catheter where it can be accumulated or flushed out of the system.

[00...

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PUM

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Abstract

Atherectomy device are guided by and manipulated by externally applied magnetic fields to treat total or partial occlusions of a patient's vasculature.

Description

[0001] This application is a continuation of U.S. patent application Ser. No. 09 / 352,161 filed Jul. 12, 1999, incorporated herein by reference.[0002] The present invention relates generally to the removal of occlusive material from body lumens, and more particularly both methods and devices for magnetically guided atherectomy of totally occluded arterial vasculature. Catheters which employ thermal as well as other energy sources are disclosed along with complementary equipment for carrying out the procedures.DESCRIPTION OF THE PRIOR ART[0003] Arteriolosclerosis is a progressive disease marked by deposits within the lumen of arterial vessels. Removal of these deposits restores blood flow and is a preferred treatment for this disease. In instances where the vessel cannot be salvaged, bypass grafts may be used to treat the disorder.[0004] A wide range of recannalization techniques have been developed over time. The primary technique in clinical use today is balloon angioplasty. This is...

Claims

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Application Information

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IPC IPC(8): A61B17/22A61B17/32A61B18/00A61B18/08A61B18/14A61B18/28A61B19/00A61M25/01
CPCA61B17/22A61B17/22012A61B17/320758A61B18/08A61B18/1492A61B18/28A61B19/5244A61B2017/00061A61B2017/22042A61B2017/22094A61B2017/320004A61B2018/00011A61B2019/2253A61B2019/5251A61M25/0127A61M2025/0166A61B34/73A61B34/20A61B2034/2051
Inventor HASTINGS, ROGER N.HALL, ANDREW F.SELL, JONATHAN C.
Owner STEREOTAXIS
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