drive wire 70 fits into hole 21 in end cap 20 and is secured using adhesive or other means sheath 50 and drive wire 70 together comprise a cable 75 which has a proximal end 76 and a distal end 77 handle assembly 90 has a longitudinally stationary portion which has a length 80 measured from a proximal end 82 to distal end 81 has a width 79 and comprises handle base 10 end cap 20 and pin 40 length 80 is 10 cm or greater and width 79 is 1 2 cm or greater thumb pad 31 is located between proximal end 82 and distal end 81 the actuation of thumb pad 31 overlaps the area between proximal end 82 and distal end 81 to operate the device the user wraps four fingers of one hand partially around handle base 10 but not overlapping thumb pad 31 the tip of the thumb of the same hand is placed on thumb pad 31 referring to fig4 basket 60 is in the open or expanded position in this position thumb pad 31 is located at proximal end 15 of wide portion of slot 14 b to actuate the device to the closed or retracted position the user extends the thumb outward from the hand while maintaining contact between the thumb and thumb pad 31 and keeping handle base 10 stationary in the hand this action causes thumb slide 30 to slide within wide portion of slot 14 b toward distal end 16 of wide portion of slot 14 b this propels sheath 50 over drive wire 70 forcing basket 60 to collapse and become enclosed within sheath 50 when thumb slide 30 rests at distal end 16 of wide portion of slot 14 b basket 60 is in.