Releasably attached snare loop retrieval device and method of using the same

• US 9,039,713 B2
• Filed: 05/13/2011
• Issued: 05/26/2015
• Est. Priority Date: 05/13/2011
• Status: Active Grant

• Current Assignee: Merit Medical Systems, Inc.
• Original Assignee: Merit Medical Systems, Inc.
• Inventors: Segermark, James D.
• Primary Examiner(s): McEvoy, Thomas
• Assistant Examiner(s): SZPIRA, JULIE ANN
• Application Number:
  US13/106,995
• Publication Number:
  US 20120289945A1
• Time in Patent Office: 1,474 Days
• Field of Search: 606/113, 606/114, 606/79
• US Class Current: 606/113
• CPC Class Codes: A61B 17/00234 for minimally invasive surgery A61B17/0218, A61B17/0469, A61B17/12013, A61B17/1285, A61B17/29, A61B17/320016 take precedence
• CPC Class Codes: A61B 17/221 Gripping devices in the form of loops or baskets for gripping calculi or similar types of obstructions surgical snare instruments A61B17/32056
• CPC Class Codes: A61B 2017/00358 Snares for grasping
• CPC Class Codes: A61B 2017/00473 Distal part, e.g. tip or head A61B2017/00464 takes precedence
• CPC Class Codes: A61B 2017/22039 eccentric
• CPC Class Codes: A61B 2017/3445 used as instrument channel for multiple instruments

Abstract

A retrieval device with releasably attached loops is disclosed. Attachment portions on one or both ends of the shaft of the snare device may allow one or more loops to be coupled or de-coupled from the shaft. The retrieval device may further comprise a delivery conduit configured to receive both a snare shaft and a guidewire in one or more lumens.

Claims

1. A snare assembly, comprising:

an elongate shaft having a first end and a second end;

a first snare loop associated with a first attachment portion configured for coupling the first snare loop to the first end of the shaft;

a second snare loop associated with a second attachment portion configured for coupling the second snare loop to the second end of the shaft; and

an elongate outer sheath having proximal and distal ends and a first lumen disposed within the outer sheath between the proximal and distal ends of the outer sheath, the first lumen configured to receive the elongate shaft, the elongate outer sheath further comprising a guidewire lumen configured to facilitate positioning of the elongate outer sheath;

wherein the first and second snare loops are selectively attachable to the shaft by a medical practitioner.

2. The snare assembly of claim 1, wherein the first snare loop or the second snare loop is coupleable to the shaft by threads.

3. The snare assembly of claim 1, wherein the first snare loop or the second snare loop is coupleable to the shaft by a flute and collet assembly.

4. The snare assembly of claim 1, wherein the first snare loop or the second snare loop is not configured to be decoupled from the shaft once initially coupled.

5. The snare assembly of claim 1, wherein the first snare loop or the second snare loop is configured to be releasably coupled to the shaft.

6. The snare assembly of claim 5, wherein the first snare loop or the second snare loop is configured such that it cannot be decoupled remotely.

7. The snare assembly of claim 1, wherein at least one of the first snare loop or second snare loop comprises a basket loop.

8. The snare assembly of claim 1, wherein the first snare loop circumscribes a larger area than the second snare loop.

9. The snare assembly of claim 1, wherein the first snare loop has a different shape than the second snare loop.

10. The snare assembly of claim 1, wherein the first lumen of the elongate outer sheath further comprises an opening extending through a sidewall of the elongate outer sheath.

15. The snare assembly of claim 1, wherein the second snare loop is configured for coupling to the first end of the shaft.

11. A snare assembly, comprising:

an elongate shaft having a first end and a second end;

a first attachment portion adjacent the first end;

a second attachment portion adjacent the second end;

a first snare loop having an attachment portion wherein the first snare loop is configured to be selectively and releasably coupled to either the first attachment portion or second attachment portion;

a guidewire; and

an elongate outer sheath having proximal and distal ends and comprising;

a first lumen disposed within the outer sheath between the proximal and distal ends of the outer sheath, the first lumen configured to receive the elongate shaft, and

a second lumen disposed within the outer sheath, the second lumen configured to receive the guidewire, wherein the guidewire is configured to facilitate positioning of the elongate outer sheath.

12. The snare assembly of claim 11, further comprising a second snare loop having an attachment portion wherein the second snare loop is configured to be selectively and releasably coupled to either the first attachment portion or second attachment portion.

13. The snare assembly of claim 12, wherein the first lumen of the elongate outer sheath further comprises an opening extending through a sidewall of the elongate outer sheath.

14. A kit comprising:

a snare assembly comprising,

an elongate outer sheath comprising an opening extending through a sidewall of the elongate outer sheath;

an elongate shaft member having a first end and a second end;

a first attachment portion adjacent the first end and a second attachment portion adjacent the second end wherein the first attachment portion and second attachment portion are configured to be selectively coupled to a snare loop by a medical practitioner; and

a plurality of snare loops configured to be coupled to the elongate shaft member.