Magnetic retrieval device and method of use

• US 20040015155A1
• Filed: 04/15/2003
• Published: 01/22/2004
• Est. Priority Date: 12/01/1999
• Status: Active Grant

• Current Assignee: SRS Medical Systems, LLC
• Original Assignee: AbbeyMoor Medical, Inc.
• Inventors: Willard, Lloyd K., Whalen, Mark J.
• Granted Patent: US 7,390,324 B2
• Time in Patent Office: Days
• US Class Current: 606/1
• CPC Class Codes: A61B 17/22031 Gripping instruments, e.g. forceps, for removing or smashing calculi A61B17/221 takes precedence
• CPC Class Codes: A61B 2017/00477 Coupling A61B2017/0046 takes precedence
• CPC Class Codes: A61F 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts

Abstract

Apparatus and method for retrieving a remotely located device equipped with a magnetic coupler is provided. The apparatus includes a magnetic coupling carried at an end of an elongate member for attracting the magnetic coupler of the remotely located device, and aligning the magnetic coupler with the magnetic coupling. A frictional engagement device, substantially housing the magnetic coupling therein, is adapted for trapping the magnetic coupler therein such that a retrieval force applied to the apparatus is transferred to the remotely located device via the frictional engagement device to thereby facilitate sure retrieval of the device as by magnetic mechanical entrapment.

Claims

1. Apparatus for retrieving a remotely located device equipped with a magnetic coupler, said apparatus comprising:

a. a magnetic coupling carried at an end of an elongate member for attracting the magnetic coupler of the remotely located device, and aligning the magnetic coupler with said magnetic coupling for cooperative engagement with said magnetic coupling; and

,

b. a frictional engagement device substantially housing said magnetic coupling therein, said frictional engagement device adapted for trapping magnetic coupler therein such that a retrieval force applied to said apparatus is transferred to the remotely located device via said frictional engagement device to thereby facilitate sure retrieval of the device as by magnetic mechanical entrapment.

2. The apparatus of claim 1 wherein said frictional engagement device extends at least partially from said end of said elongate member.

3. The apparatus of claim 2 further comprising a sheath surrounding said elongate member, and axially aligned therewith for axial adjustment with respect thereto, said frictional engagement device being radially collapsible within said sheath upon select adjustment of said sheath.

4. The apparatus of claim 2 wherein said frictional engagement device has a free end, said free end being radiused.

5. The apparatus of claim 4 wherein said magnetic coupler is capable of being trapped at said free end of said frictional engagement device during retrieval of the remotely located device.

6. The apparatus of claim 2 wherein said frictional engagement device has a free end, said free end having a parabolic configuration.

7. The apparatus of claim 6 wherein said magnetic coupler is capable of being trapped at said free end of said frictional engagement device during retrieval of the remotely located device.

8. The apparatus of claim 2 wherein said frictional engagement device comprises a plurality of frictional engagement device members.

9. The apparatus of claim 8 wherein said frictional engagement device comprises four frictional engagement device members.

10. The apparatus of claim 8 wherein each of the members of said plurality of frictional engagement device members are of stainless steel construction.

11. The apparatus of claim 1 further comprising a sheath surrounding said elongate member, and axially aligned therewith for axial adjustment with respect thereto, said frictional engagement device extending from an end of said sheath for axial movement therewith.

12. The apparatus of claim 1 wherein said apparatus further includes an amplification device adapted to be linked to said elongate member so as to augment an audio signal resulting from mating of the magnetic coupler with said magnetic coupling, thereby providing aural indicia of device capture in anticipation of retrieval.

13. The apparatus of claim 12 wherein said amplification device is a stethoscope.

14. Apparatus for retrieving remotely deployed medical devices from a mammalian body, the devices having a magnetic coupler, said apparatus comprising:

a. a magnetic coupling carried at an end of an elongate body for at least initially attracting the magnetic coupler of the remotely located device and aligning the magnetic coupler with said magnetic coupling for cooperative engagement with said magnetic coupling; and

,

b. means for mechanically retaining the initially attracted and aligned magnetic coupler such that a retrieval force applied to said apparatus is transferred to the remotely located device via said means to thereby facilitate sure retrieval of the device as by magnetic mechanical entrapment.

15. The apparatus of claim 14 wherein said means for mechanically retaining the initially attracted and aligned magnetic coupler is a frictional engagement device, said frictional engagement device substantially housing said magnetic coupling therein.

16. The apparatus of claim 15 wherein said apparatus further includes means for manipulating said frictional engagement device in furtherance of secure capture of the magnetic coupler within said frictional engagement device throughout a retrieval procedure.

17. The apparatus of claim 16 wherein said manipulation includes selective axial translation of said basket relative to said magnetic coupling.

18. The apparatus of claim 17 wherein said means for manipulating said frictional engagement device in furtherance of secure capture of the magnetic coupler within said frictional engagement device comprises a second elongate body, said second elongated body surrounding said elongate body, and axially aligned therewith for axial adjustment with respect thereto, said frictional engagement device extending from a free end of said second elongated body.

19. The apparatus of claim 16 wherein said manipulation includes selective radial collapse of said frictional engagement device.

20. The apparatus of claim 19 wherein said means for manipulating said frictional engagement device in furtherance of secure capture of the magnetic coupler within said frictional engagement device comprises a second elongate body surrounding said elongate body, and axially aligned therewith for axial adjustment with respect thereto, said frictional engagement device extending from said free end of said elongate body, and thereby being radially collapsible within said second elongate body upon select adjustment of said second elongate body.

21. The apparatus of claim 14 further comprising a second elongate body, said second elongated body surrounding said elongate body, and axially aligned therewith for axial adjustment with respect thereto.

22. The apparatus of claim 21 wherein said means for mechanically retaining the initially attracted and aligned magnetic coupler is a strap, said strap joining said magnetic coupling to a distal portion of said second elongate body such that upon axial translation of said second elongate body, a closure is formed about said magnetic coupling and the attracted magnetic coupler.

23. In a method of conducting minimally invasive medical procedures on a mammalian body, the steps comprising:

a. providing a medical device equipped with a magnetic coupler;

b. deploying said medical device within the mammalian body;

c. providing an advanceable retrieval tool comprising an elongate member equipped with a magnetic coupling at one end thereof, and a frictional engagement device extending from said end of said elongate member, said magnetic coupling being substantially housed therein;

d. advancing said advanceable retrieval tool toward said medical device such that said magnetic coupler is drawn into said frictional engagement device toward said magnetic coupling so as to mate with said magnetic coupling, said magnetic coupler being trapped within said frictional engagement device so as to be retrieved by said advanceable retrieval tool.

24. The method of claim 23 wherein said magnetic coupler is non-rigidly connected to said medical device.

25. The method of claim 24 wherein a tether joins said magnetic coupler to said medical device.

26. The method of claim 25 wherein further retrieval security is provided via rotation of said tool so as to cause said tether to pull said magnetic coupler into said frictional engagement device.

27. The method of claim 23 comprising the further step of auditory monitoring to detect the mating of said magnetic coupler with said magnetic coupling.