Handle assembly for tissue resection device

1 . A handle assembly for a tissue resection device, comprising:

a handle including:

an elongate tubular body defining a central longitudinal axis, and

a palm grip having a first end coupled to the elongate tubular body, the palm grip extending from the elongate tubular body to a second end spaced apart from the elongate tubular body, the palm grip being configured to be engaged by a palm of a user;

a trigger member having a first end coupled to the elongate tubular body, the trigger member extending from the elongate tubular body to a second end spaced apart from the elongate tubular body, the trigger member being configured to be engaged by one or more fingers of the user; and

a drive mechanism disposed within the elongate tubular body, the drive mechanism being configured to move a tissue resection element extending distally from the elongate tubular body;

wherein the trigger member is engaged with the drive mechanism such that translation of the trigger member relative to the handle actuates the drive mechanism;

wherein the first end and the second end of the trigger member are configured to translate in a first direction parallel to the central longitudinal axis between a first position that is a distalmost position and a second position that is a proximal most position;

wherein in the first position the first end and the second end of the trigger member are disposed distal of the palm grip;

further comprising a return spring disposed within the elongate tubular body, wherein the return spring biases the trigger member toward the first position; and

further comprising a resilient member extending from the palm grip to the trigger member outside of the elongate tubular body.

2 . The handle assembly of claim 1 , wherein the resilient member is configured to bias the trigger member toward the first position.

3 . The handle assembly of claim 1 , wherein the trigger member is nonpivoting relative to the elongate tubular body.

4 . The handle assembly of claim 1 , wherein the trigger member is nonpivoting relative to the palm grip.

5 . The handle assembly of claim 1 , wherein the palm grip extends radially from the central longitudinal axis a first distance, and no other structure of the handle assembly extends radially from the central longitudinal axis more than the first distance.

6 . The handle assembly of claim 1 , wherein the drive mechanism is configured to rotate the tissue resection element.

7 . The handle assembly of claim 1 , wherein the drive mechanism is configured to axially translate the tissue resection element.

8 . The handle assembly of claim 1 , wherein the drive mechanism is configured to reciprocate the tissue resection element.

9 . A tissue resection device, comprising:

a handle assembly, comprising:

a handle including:

an elongate tubular body defining a central longitudinal axis, and

a palm grip extending from the elongate tubular body, the palm grip being configured to be engaged by a palm of a user;

a trigger member extending from the elongate tubular body, the trigger member being configured to be engaged by one or more fingers of the user;

a drive mechanism disposed within the elongate tubular body;

a return spring disposed within the elongate tubular body, wherein the return spring biases a first end of the trigger member in a distal direction toward a first position of the trigger member; and

a resilient member extending from the palm grip to the trigger member outside of the elongate tubular body, wherein the resilient member biases a second end of the trigger member in the distal direction toward the first position of the trigger member; and

a tissue resection element extending distally from the elongate tubular body;

wherein the drive mechanism is configured to move the tissue resection element relative to the handle;

wherein the trigger member is engaged with the drive mechanism such that translation of the trigger member relative to the handle actuates the drive mechanism, wherein the trigger member is non-pivotably coupled to the handle.

10 . The tissue resection device of claim 9 , wherein the trigger member is configured to translate parallel to the central longitudinal axis between the first position and a second position.

11 . The tissue resection device of claim 9 , wherein the return spring exerts a first force in the distal direction against the trigger member;

wherein the resilient member exerts a second force in the distal direction against the trigger member;

wherein the first force is within 5% of the second force.

12 . The tissue resection device of claim 11 , wherein the first force is substantially equal to the second force.

13 . A handle assembly for a tissue resection device, comprising:

a handle including:

an elongate tubular body defining a central longitudinal axis, and

a palm grip extending from the elongate tubular body, the palm grip being configured to be engaged by a palm of a user;

a trigger member non-pivotably coupled to the handle, the trigger member being configured to be engaged by one or more fingers of the user;

a drive mechanism disposed within the elongate tubular body, the drive mechanism being configured to move a tissue resection element extending distally from the elongate tubular body;

a resilient member disposed outside of the elongate tubular body and coupled to the palm grip and the trigger member, wherein the resilient member biases the trigger member away from the palm grip; and

a return spring disposed within the elongate tubular body, wherein the return spring biases the trigger member away from the palm grip;

wherein the trigger member is engaged with the drive mechanism such that translation of the trigger member along the central longitudinal axis actuates the drive mechanism;

wherein the resilient member comprises a first end fixedly attached to the palm grip, a second end fixedly attached to the trigger member, and a body portion configured to move radially relative to the central longitudinal axis as the trigger member is translated along the central longitudinal axis.

14 . The handle assembly of claim 13 , wherein the trigger member is configured to translate in a direction parallel to the central longitudinal axis.

15 . The handle assembly of claim 13 , wherein the resilient member is configured to balance force exerted on the trigger member by the return spring.

16 . The handle assembly of claim 13 , wherein the drive mechanism is configured to reciprocate a tissue resection element extending distally from the elongate tubular body.

17 . The handle assembly of claim 13 , wherein the trigger member extends at an oblique angle to the central longitudinal axis and the oblique angle remains generally constant when the trigger member is translated along the central longitudinal axis.