Medical retrieval devices and methods

Abstract

A device may include a distal assembly including a first plurality of legs, a second plurality of legs, and a distal tip, and further include a first driver and a second driver, a proximal end of at least one leg of the first plurality of legs may be coupled to the first driver, and a proximal end of at least one leg of the second plurality of legs may be coupled to the second driver. The medical device may include a first longitudinally extending hollow member movably positioned along the first driver and a second longitudinally extending hollow member movably positioned along the second driver. Movement of the first longitudinally extending hollow member relative to the first driver may converge legs of the first plurality of legs, and movement of the second longitudinally extending hollow member relative to the second driver may converge legs of the second plurality of legs.

1 .- 20 . (canceled) 
     
     
         21 . A medical device comprising:
 a distal assembly including a first plurality of legs and a second plurality of legs, wherein the first plurality of legs and the second plurality of legs meet at a distal tip;   a first driver, wherein a proximal end of at least one leg of the first plurality of legs is coupled to the first driver, and   a first longitudinally extending hollow member movably positioned along the first driver;   wherein movement of the first longitudinally extending hollow member relative to the first driver converges legs of the first plurality of legs, and wherein movement of the first longitudinally extending hollow member relative to the first driver does not converge legs of the second plurality of legs.   
     
     
         22 . The medical device of  claim 21 , further comprising:
 a second driver, wherein a proximal end of at least one leg of the second plurality of legs is coupled to the second driver; and   a second longitudinally extending hollow member movably positioned along the second driver;   wherein movement of the second longitudinally extending hollow member relative to the second driver converges legs of the second plurality of legs, and wherein movement of the second longitudinally extending hollow member relative to the second driver does not converge legs of the first plurality of legs.   
     
     
         23 . The medical device of  claim 22 , wherein each of the first longitudinally extending hollow member and the second longitudinally extending hollow member is independently movable. 
     
     
         24 . The medical device of  claim 21 , wherein each of the first plurality of legs and the second plurality of legs includes a proximal portion and a distal portion, wherein the distal portion includes more legs than the proximal portion. 
     
     
         25 . The medical device of  claim 24 , wherein the proximal portion comprises four legs and the distal portion comprises eight legs. 
     
     
         26 . The medical device of  claim 24 , wherein the proximal portion of the first plurality of legs comprises a different number of legs than the proximal portion of the second plurality of legs. 
     
     
         27 . The medical device of  claim 21 , wherein the first longitudinally extending hollow member is configured to slide over the first plurality of legs. 
     
     
         28 . The medical device of  claim 21 , wherein the first plurality of legs and the second plurality of legs are cut from a tube. 
     
     
         29 . The medical device of  claim 21 , wherein the first longitudinally extending hollow member comprises a coil or a hypotube. 
     
     
         30 . The medical device of  claim 21 , further comprising:
 a handle coupled to a sheath, wherein the handle includes an actuator configured to reciprocally move the first plurality of legs and the second plurality of legs from a position within the sheath to a position extending distally of the sheath, and a first hollow member actuator configured to reciprocally move the first longitudinally extending hollow member relative to the first driver.   
     
     
         31 . A method, comprising:
 delivering a medical device to an area within a patient, the medical device comprising a first driver and a distal assembly, the distal assembly being configured to transition between a first retracted configuration within a sheath and a second deployed configuration extending distally of the sheath;   moving the distal assembly to the deployed configuration;   capturing an object of interest within the distal assembly, the distal assembly including a first plurality of legs and a second plurality of legs, wherein the first plurality of legs and the second plurality of legs meet at a distal tip, and wherein a proximal end of at least one leg of the first plurality of legs is coupled to the first driver; and   extending a first longitudinally extending hollow member relative to the first driver to converge legs of the first plurality of legs, wherein extending the first longitudinally extending hollow member does not converge legs of the second plurality of legs.   
     
     
         32 . The method of  claim 31 , wherein the medical device comprises a second driver, and wherein a proximal end of at least one leg of the second plurality of legs is coupled to the second driver, and further comprising:
 extending a second longitudinally extending hollow member relative to the second driver to converge legs of the second plurality of legs, wherein extending the second longitudinally extending hollow member does not converge legs of the first plurality of legs.   
     
     
         33 . The method of  claim 32 , wherein extending the first longitudinally extending hollow member relative to the first driver and the second longitudinally extending hollow member relative to the second driver comprises extending the first longitudinally extending hollow member independently of extending the second longitudinally extending hollow member. 
     
     
         34 . The method of  claim 31 , further comprising:
 releasing the object of interest.   
     
     
         35 . The method of  claim 31 , further comprising:
 retracting the first longitudinally extending hollow member relative to the first driver.   
     
     
         36 . A method, comprising:
 delivering a medical device to an area within a patient, the medical device comprising a first driver and a distal assembly, the distal assembly being configured to transition between a first retracted configuration within a sheath and a second deployed configuration extending distally of the sheath;   moving the distal assembly to the deployed configuration;   capturing an object of interest within the distal assembly, the distal assembly including a first plurality of legs, a second plurality of legs, and a distal tip, wherein the first plurality of legs and the second plurality of legs meet at the distal tip, wherein a proximal end of at least one leg of the first plurality of legs is coupled to the first driver; and   extending a first longitudinally extending hollow member relative to the first driver to converge legs of the first plurality of legs, wherein the first longitudinally extending hollow member comprises a coil or a hypotube, and wherein extending the first longitudinally extending member does not converge the second plurality of legs.   
     
     
         37 . The method of  claim 36 , wherein the medical device comprises a second driver, wherein a proximal end of at least one leg of the second plurality of legs is coupled to the second driver, further comprising:
 extending a second longitudinally extending hollow member relative to the second driver to converge legs of the second plurality of legs, wherein the second longitudinally extending hollow member comprises a coil or a hypotube, and wherein extending the second longitudinally extending member does not converge the first plurality of legs.   
     
     
         38 . The method of  claim 37 , wherein extending the first longitudinally extending hollow member is performed independently of extending the second longitudinally extending hollow member. 
     
     
         39 . The method of  claim 38 , further comprising:
 retracting at least one of the first longitudinally extending hollow member relative to the first driver and the second longitudinally extending hollow member relative to the second driver.   
     
     
         40 . The method of  claim 38 , further comprising:
 releasing the object of interest.