Medical retrieval devices and related methods of use
A medical device that may include a plurality of branch members forming a basket movable between a collapsed configuration and an expanded configuration is disclosed. Each branch member may include a proximal coil, and a distal coil. Each branch member may also include an uncoiled portion disposed between the proximal coil and the distal coil, and a movable portion.
1. A medical device, comprising:
a plurality of branch members forming a basket movable between a collapsed configuration and an expanded configuration, each branch member having:
a proximal coil defining a lumen;
a distal coil defining a lumen;
an uncoiled portion disposed between the proximal coil and the distal coil; and
a movable portion that slides through the lumen of the proximal coil and the lumen of the distal coil to move the basket between the collapsed configuration and the expanded configuration.
2. The medical device of claim 1 , each of the plurality of branch members being formed from two separate filaments.
3. The medical device of claim 2 , wherein a first branch member of the plurality of branch members is formed such that the proximal coil and distal coil of the first branch member are formed from a first filament and the movable portion of the first branch member is formed from a second filament.
4. The medical device of claim 3 , wherein a second branch member of the plurality of branch members includes a movable portion formed by a portion of the first filament, and a proximal coil and distal coil formed by a third filament.
5. The medical device of claim 1 , wherein the plurality of branch members are formed by an equal number of filaments.
6. The medical device of claim 1 , further including a sheath coupled to each of the plurality of branch members proximal to the plurality of proximal coils.
7. The medical device of claim 6 , wherein each of the plurality of movable portions extend proximally through the sheath.
8. The medical device of claim 7 , wherein the basket is configured to:
move from the expanded configuration to the collapsed configuration by a proximal movement of each of the movable portions; and
move from the collapsed configuration to the expanded configuration by a distal movement of each of the movable portions.
9. The medical device of claim 6 , wherein each branch member further includes an uncoiled portion between the proximal coil and the sheath.
10. The medical device of claim 6 , wherein each of the plurality of proximal coils is directly coupled to the sheath.
11. The medical device of claim 1 , wherein each movable portion includes a bridge portion extending distally from a respective distal coil toward an adjacent branch member, wherein, when the basket is in the expanded configuration, the medical device includes a plurality of bridge portions that at least partially define a distally-facing opening, the distally-facing opening being the only distally-facing opening of the basket.
12. The medical device of claim 1 , wherein the proximal coil and the distal coil of a given branch member are formed from the same filament.
13. The medical device of claim 12 , wherein the uncoiled portion of the given branch member is formed from the same filament as the proximal coil and the distal coil of the given branch member.
14. The medical device of claim 1 , wherein the medical device includes a plurality of side openings, wherein each of the plurality of side openings is partially defined by adjacent branch members, and only one side opening is disposed between a given pair of adjacent branch members.
15. A medical device, comprising:
a plurality of branch members forming a basket movable between a collapsed configuration and an expanded configuration, each branch member having:
a proximal coil;
a distal coil;
an uncoiled portion disposed between the proximal coil and the distal coil; and
a movable portion;
wherein each movable portion includes a bridge portion extending distally from a respective distal coil toward an adjacent branch member, and each bridge portion has a shorter length in the collapsed configuration than in the expanded configuration.
16. A medical device, comprising:
a plurality of branch members forming a basket movable between a collapsed configuration and an expanded configuration, each branch member having a proximal coil formed from a filament, a distal coil formed from the same filament as the proximal coil, an uncoiled portion disposed between the proximal coil and the distal coil, and a movable portion, wherein:
each of the plurality of distal coils is staggered about a longitudinal axis of the medical device from a remaining plurality of distal coils; and
each of the plurality of proximal coils is staggered about the longitudinal axis of the medical device from a remaining plurality of proximal coils.
17. The medical device of claim 16 , wherein each uncoiled portion is located at approximately a midpoint between a respective distal coil and proximal coil.
18. The medical device of claim 16 , wherein the plurality of branch members are formed by an equal number of filaments.
19. The medical device of claim 16 , wherein the uncoiled portion of a given branch member is formed from the same filament as the proximal coil and the distal coil of the given branch member.