Devices, systems, and methods for a catheter accessory

1. An instrument accessory device, comprising:

a body having a proximal end, a distal end, a longitudinal axis, and a wall defining an instrument lumen extending between the proximal end and the distal end along the longitudinal axis of the body, the instrument lumen having an inlet and an outlet at the respective proximal end and distal end of the body, the instrument lumen configured to slidingly receive a length of an instrument extendible through the instrument lumen;

an expandable member disposed about the wall at the distal end of the body, the expandable member extending between a proximal end and a distal end along a longitudinal axis of the expandable member;

an elongate delivery member having a proximal end and a distal end that is attached to the body, the body positioned at the distal end of the elongate delivery member, the elongate delivery member comprising an inflation lumen extending between the proximal end of the elongate delivery member and the distal end of the elongate delivery member and in fluid communication with the expandable member at the distal end of the elongate delivery member;

a handle at the proximal end of the elongate delivery member, wherein the inflation lumen is continuous with a handle lumen extending along the handle; and

a stylet removably receivable within the inflation lumen, the stylet having a cap at a proximal end of the stylet, the cap reversibly coupleable to the handle;

wherein the elongate delivery member is configured to slide the instrument lumen of the body and the expandable member along the length of the instrument when extended therethrough.

2. The device of claim 1 , wherein the expandable member is adhered to the wall at the proximal and distal ends of the expandable member.

3. The device of claim 1 , wherein the distal end of the elongate delivery member is disposed between the proximal end of the expandable member and the distal end of the expandable member.

4. The device of claim 1 , wherein the instrument is a guidewire, a catheter, or the catheter combined with the guidewire.

5. The device of claim 1 , wherein the expandable member is pneumatically, electrically, or mechanically expandable.

6. The device of claim 1 , wherein the expandable member comprises a self-expanding or shape memory material.

7. The device of claim 1 , wherein the inflation lumen is configured to communicate a fluid between the proximal end of the elongate delivery member and the expandable member.

8. The device of claim 1 , wherein the distal end of the elongate delivery member and the proximal end of the expandable member are adhered to the wall at the proximal end of the body.

9. The device of claim 1 , wherein the expandable member comprises a compliant balloon or semi-compliant balloon.

10. A catheter system, comprising:

an instrument; and

a catheter accessory slidably disposable about the instrument, comprising:

a body having a proximal end, a distal end, a longitudinal axis, and a wall defining an instrument lumen extending between the proximal end and the distal end along the longitudinal axis of the body, the instrument lumen having an inlet and an outlet at the respective proximal end and distal end of the body, the instrument lumen configured to slidingly receive a length of the instrument extendible through the instrument lumen;

an expandable balloon coupled to the body;

an elongate delivery member attached at a distal end of the elongate delivery member to the body and having an inflation lumen extending therethrough in fluid communication with the expandable balloon, the body positioned at the distal end of the elongate delivery member;

a handle at a proximal end of the elongate delivery member, wherein the inflation lumen is continuous with a handle lumen extending along the handle; and

a stylet removably receivable within the inflation lumen, the stylet having a cap at a proximal end of the stylet, the cap reversibly coupled to the handle;

wherein the elongate delivery member is configured to slide the instrument lumen of the body and the expandable member along the length of the instrument when extended therethrough.

11. The system of claim 10 , wherein the instrument comprises a guidewire, a catheter, or the catheter combined with the guidewire.

12. The system of claim 10 , wherein the instrument comprises a guidewire, a catheter, or the catheter disposable about the guidewire.

13. The system of claim 10 , wherein the expandable balloon comprises a compliant balloon or semi-compliant balloon.

14. A method of delivering a treatment fluid within a patient using the catheter system of claim 10 , the method comprising:

inserting the instrument through the instrument lumen of the catheter accessory, wherein the instrument is a guidewire;

advancing the guidewire through a body lumen to a first treatment site within the patient;

inserting a catheter into the instrument lumen about the guidewire;

advancing the catheter to the first treatment site;

advancing the catheter accessory along the catheter to a position proximal to the first treatment site;

expanding the expandable balloon about the catheter accessory to occlude the body lumen at the proximal position; and

supplying a treatment fluid through the catheter to the first treatment site.

15. The method of claim 14 , wherein expanding comprises supplying a fluid through the inflation lumen to inflate the expandable balloon.

16. The method of claim 14 , further comprising:

deflating the expandable balloon;

moving the catheter to a second treatment site;

moving the catheter accessory to a position proximal to the second treatment site;

re-inflating the expandable balloon; and

supplying the treatment fluid through the catheter to the second treatment site.