Minimally-invasive medical retrieval device

• US 20020068954A1
• Filed: 09/14/2001
• Published: 06/06/2002
• Est. Priority Date: 03/26/1999
• Status: Active Grant

• Current Assignee: Cook Urological, Inc. (Cook Group Incorporated)
• Original Assignee: Cook Urological, Inc. (Cook Group Incorporated)
• Inventors: Foster, Thomas L.
• Granted Patent: US 6,893,450 B2
• Time in Patent Office: Days
• US Class Current: 606/200
• 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 2017/2212 having a closed distal end, e.g. a loop
• CPC Class Codes: A61B 2017/2215 having an open distal end

Abstract

A medical retrieval device is provided which includes an elongated cylindrical member having a passage extending therein and having a metallic proximal and distal portions. The proximal and distal portions are formed as separate pieces and connected at a junction. The elongated cylindrical member has an area of substantially constant inner and outer diameters extending at least from a portion of the proximal portion closely adjacent to the junction through the junction and to a portion of the distal portion closely adjacent to the junction.

Claims

1. A medical retrieval device comprising:

an elongated cylindrical member having a passage extending therein and having a metallic proximal and distal portions, and a retrieving portion defined in the distal portion;

said proximal and distal portions formed as separate pieces and connected at a junction; and

whereby the elongated cylindrical member has an area of substantially constant inner and outer diameters extending at least from a portion of the proximal portion closely adjacent to the junction through the junction and to a portion of the distal portion closely adjacent to the junction.

2. The medical device of claim 1 wherein the retrieving portion includes a plurality of resilient grasping members.

3. The medical device of claim 2 wherein the resilient grasping members are manipulable between a compact shape and an enlarged shape, wherein the resilient grasping members of the enlarged shape are in a relaxed condition.

4. The medical device of claim 2 wherein the resilient grasping members, each having a distal end and a proximal end, are conjoined about the distal ends thereof.

5. The medical device of claim 4 wherein the distal portion comprises a proximal closed cylinder and a distal closed cylinder and the resilient grasping members are conjoined at the proximal and distal ends thereof by respective ones of the proximal closed cylinder and the distal closed cylinder.

6. The medical device of claim 3, further comprising an external constraining mechanism to constrain the distal portion of the elongated cylindrical member into the compact shape, the external constraining mechanism being longitudinally slidable about the elongated cylindrical member to alternately deploy the resilient grasping members to the enlarged shape, or recompress the resilient grasping members having the enlarged shape into one of the compact shape or a substantially closed position for capture or capture and retrieval of an object from within a patient.

7. A medical retrieval device comprising:

an elongated cylindrical member having a proximal portion and a distal portion and a lumen extending therein, the distal portion defining a retrieving portion, and each of the proximal and distal portions having a proximal end and a distal end;

one of the proximal and distal portions having an end including an area of reduced outer diameter terminating in a shoulder;

the other of the proximal and distal portions including a braided sleeve; and

a junction wherein the braided sleeve extends over the area of reduced outer diameter to allow the elongated cylindrical member to have a continuous and concentric lumen through the proximal portion and at least a portion of the distal portion.

8. The medical device of claim 7 wherein the braided sleeve is attached to the area of reduced outer diameter by an adhesive.

9. The medical device of claim 8 wherein the adhesive is a medical grade epoxy.

10. The medical device of claim 8 wherein the braided sleeve is at least partially covered by an outer sheath of lubricious material.

11. The medical device of claim 10 wherein the lubricious material is polyimide.

12. The medical device of claim 7 wherein the retrieving portion includes a plurality of resilient grasping members.

13. The medical device of claim 12 wherein the resilient grasping members are manipulable between a compact shape and an enlarged shape, wherein the resilient grasping members of the enlarged shape are in a relaxed condition.

14. The medical device of claim 12 wherein the resilient grasping members, each having a distal end and a proximal end, are conjoined about the distal ends thereof.

15. The medical device of claim 14 wherein the distal portion comprises a proximal closed cylinder and a distal closed cylinder and the resilient grasping members are conjoined at the proximal and distal ends thereof by respective ones of the proximal closed cylinder and the distal closed cylinder.

16. The medical device of claim 13, further comprising an external constraining mechanism to constrain the distal portion of the elongated cylindrical member into the compact shape, the external constraining mechanism being longitudinally slidable about the elongated cylindrical member to alternately deploy the resilient grasping members to the enlarged shape, or recompress the resilient grasping members having the enlarged shape into one of the compact shape or a substantially closed position for capture or capture and retrieval of an object from within a patient.

17. A method of making a medical retrieval device comprising the steps of:

providing a distal portion having an area of reduced outer diameter and a lumen extending therein;

providing a proximal portion including a hollow braided sleeve having an inside diameter approximately equal to the outside diameter of the area of reduced outer diameter;

inserting the area of reduced outer diameter within the hollow braided sleeve to establish a substantially concentric and continuous lumen therebetween; and

applying adhesive to at least one of the hollow braided sleeve and the area of reduced outer diameter to secure a connection therebetween.