OBJECT CAPTURE DEVICE

• US 20150005781A1
• Filed: 12/07/2012
• Published: 01/01/2015
• Est. Priority Date: 01/10/2012
• Status: Active Grant

• Current Assignee: Cook Medical Incorporated (Cook Group Incorporated)
• Original Assignee: Cook Medical Incorporated (Cook Group Incorporated)
• Inventors: Lund-Clausen, Jacob, Hansen, Palle Munk, Mihaljevic, Petar, Svensson, Kerstin
• Granted Patent: US 9,427,244 B2
• Time in Patent Office: Days
• US Class Current: 606/127
• 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 2017/00867 shape memory effect for prostheses A61F2210/0014
• CPC Class Codes: A61B 2017/2215 having an open distal end
• CPC Class Codes: A61B 2017/3435 using everted sleeves

Abstract

A medical device for collecting objects from a body lumen comprises a catheter, a basket having a closed first end and an open second end, and an actuator connected to the closed first end of the basket, the catheter and basket moveable relative to one another between a first configuration and a second configuration to draw objects from a body lumen into the basket. In the first configuration the closed first end of the basket is inside the catheter and the open second end is everted over at least a part of the closed first end. The apparatus may be actuated to pull the closed first end of the basket further into the catheter and invert the second end of the basket, the second end scraping the sides of the lumen as it inverts, surrounding an object in the lumen, and drawing the object into the basket.

Claims

1. A medical device for collecting objects from a body vessel, including:

a catheter provided with a proximal end, a distal end and a lumen therethrough;

an elongate basket provided with a closed first end and an open second end; and

an actuator connected to the closed first end of the basket and extending through the lumen of the catheter to the proximal end of the catheter;

wherein the catheter and the basket are movable relative to one another between a first configuration in which the first end of the basket is located within the distal end of the catheter and the second end of the basket extends radially out of the catheter and is everted over at least part of the first end of the basket, and a second configuration in which the first end is withdrawn into the catheter and the everted second end is at least partially inverted; and

wherein, the medical device is operable so as to move the catheter and the basket from said first configuration to said second configuration, said movement in use causing objects in a body vessel to be drawn into the basket.

2. A medical device according to claim 1, wherein the basket is made of shape memory material.

3. A medical device according to claim 1, wherein the basket is made of wire or filamentary material.

4. A medical device according to claim 3, wherein the wire or filamentary material is braided.

5. A medical device according to claim 4, wherein the wire or filamentary material is tightly braided so as to prevent fluid from passing through the basket.

6. A medical device according to claim 1, wherein the basket has an impermeable covering.

7. A medical device according to claim 1, wherein the actuator is a wire.

8. A medical device according to claim 1, wherein the basket comprises apertures sized to allow fluid to pass through the closed first end of the basket but prevent the captured objects from passing therethrough.

9. A medical device according to claim 1, wherein the actuator is actuatable so as to draw the basket into the catheter and so move the catheter and the basket from said first configuration to said second configuration.

10. A medical device according to claim 1 wherein, the medical device is operable so as to advance the catheter over the basket and so move the catheter and the basket from said first configuration to said second configuration.

11. A medical device according to claim 1, wherein in the second configuration the first end and substantially the whole of the second end of the basket may be withdrawn into the catheter.

12. A medical device according to claim 1, wherein the basket is from 10 to 200 mm in length.

13. A medical device according to claim 1, wherein the second end is constrained in the first position and free from constraint in the second position.

14. A medical device according to claim 1 including an outer sheath provided with a proximal and a distal end and a lumen therethrough, wherein the catheter is disposed within the lumen of the outer sheath, thereby to be configured as an inner catheter, an annular space being provided between the inner catheter and the outer sheath, and wherein in said first configuration the second end of the basket is located in the annular space between the inner catheter and outer sheath.

15. A medical device according to claim 14 wherein the second end of the basket is free from attachment and wherein the inner catheter and outer sheath are moveable relative to one another so as to release the second end of the basket from between the outer sheath and the inner catheter.

16. A medical device for collecting objects from a body vessel, including:

a catheter provided with a proximal end, a distal end and a lumen therethrough;

an elongate basket provided with a first end and a second end; and

an actuator connected to the first end of the basket and extending through the lumen of the catheter to the proximal end of the catheter;

wherein the catheter and the basket are movable relative to one another between a first configuration in which the first end of the basket is located within the distal end of the catheter and the second end of the basket extends radially out of the catheter and is everted over the first end of the basket, the second end being constrained in position, and a second configuration in which the first end is withdrawn into the catheter and the everted second end is at least partially inverted, the second end being free from constraint; and

wherein, the medical device is operable so as to release the second end from constraint, and move the catheter and the basket from said first configuration to said second configuration, said movement in use causing objects in a body vessel to be drawn into the basket.

17. A medical device according to claim 16, wherein the first end of the basket is closed and the second end open.

18. A medical device according to claim 16, wherein the basket is made of shape memory material, said material having a memory shape, and wherein releasing the second end portion allows the basket to assume its memory shape.

19. A method of collecting objects from a body vessel, including:

providing a medical device including a catheter provided with proximal end, a distal end and a lumen therethrough, and an elongate basket provided with a closed first end and an open second end; and

an actuator connected to the closed first end of the basket and extending through the lumen of the catheter to the proximal end of the catheter;

wherein the catheter and the basket are moveable relative to one another between a first configuration and a second configuration, wherein in the first configuration the first end of the basket is located within the distal end of the catheter and the second end of the basket extends radially out of the catheter and is everted over the first end of the basket, and in the second configuration the first end and at least part of the second end of the basket is withdrawn into the catheter and the everted second end is at least partially inverted;

inserting the medical device into a body vessel; and

operating the medical device so as to move the catheter and the basket from said first configuration to said second configuration thereby causing objects in a body vessel to be drawn into the basket.

20. The method of claim 19, wherein the medical device further comprises an outer sheath having a lumen, the catheter is disposed within the lumen of the outer sheath in the first configuration, and the second end of the basket is disposed within an annular space defined between the outer sheath and the catheter in the first configuration, and the outer sheath is moveable relative to the catheter and the basket to expose the second end of the basket.