Interchangeable flush/selective catheter

1. A convertible catheter comprising:

an outer catheter comprising a distal end, a proximal end, and at least one side therebetween, wherein the outer catheter comprises at least one flush hole on the at least one side closer to the distal end than the proximal end;

an inner catheter comprising an open distal end, a proximal end, and at least one side therebetween, wherein the inner catheter is slidably within the outer catheter, wherein the inner catheter comprises at least one flush hole on the at least one side closer to the distal end than the proximal end;

a closure device configured to close the inner catheter, wherein the closure device is located closer to the distal end of the inner catheter than the at least one flush hole of the inner catheter;

an adapter coupled to the outer catheter and the inner catheter, wherein the adapter comprises a first connector connected to the outer catheter and a second connector connected to the inner catheter, wherein the second connector is rotatable with respect to the first connector to slidably rotate and move the inner catheter within the outer catheter;

wherein the convertible catheter is configurable as a flush catheter when the inner catheter is slidably rotated and moved to align the at least one flush hole of the inner catheter with the at least one flush hole of the outer catheter and the closure device closes the distal end of the inner catheter; and

wherein the convertible catheter is configurable as a selective catheter when the inner catheter is slidably rotated and moved to misalign the at least one flush hole of the inner catheter with respect to the at least one flush hole of the outer catheter and the closure device opens the distal end of the inner catheter.

2. The convertible catheter of claim 1 , wherein the closure device comprises an occluding tip, wherein the occluding tip is connected to a tip wire to enable opening and closing of the inner catheter.

3. The convertible catheter of claim 1 , wherein the inner catheter is a reverse curve catheter.

4. The convertible catheter of claim 1 , wherein the inner catheter is a guide catheter.

5. The convertible catheter of claim 1 , wherein the inner catheter comprises at least one flush hole and an occluding tip as the closure device.

6. The convertible catheter of claim 5 , wherein the convertible catheter is configured to be used as a flush catheter when the at least one flush hole in the outer catheter is aligned with the at least one flush hole in the inner catheter and an occluding tip closes the open tip of the inner catheter.

7. The convertible catheter of claim 1 , wherein the closure device comprises an iris.

8. A method of converting the convertible converter of claim 1 as a flush catheter, the method comprising:

slideably rotating and moving the inner catheter to align the at least one flush hole of the inner catheter and the at least one flush hole of the outer catheter; and

closing the distal end of the inner catheter using the closure device.

9. A method of converting the convertible converter of claim 1 as a selective catheter, the method comprising:

slideably rotating and moving the inner catheter to misalign the at least one flush hole of the inner catheter with the at least one flush hole of the outer catheter; and

opening the distal end of the inner catheter.

10. A convertible catheter, configurable as a selective catheter or a flush catheter, the convertible catheter comprising:

an outer catheter comprising a distal end, a proximal end, and at least one side therebetween, wherein the outer catheter comprises at least one flush hole on the at least one side closer to the distal end than the proximal end;

the outer catheter further comprising a closure device, near the distal end, distal to the at least one flush hole;

an inner catheter comprising an open distal end, a proximal end, and at least one side therebetween, wherein the inner catheter slideably fits within the outer catheter;

the closure device configured to open when the inner catheter is pushed through the closure device, exposing the open distal end of the inner catheter;

an adapter coupled to the outer catheter and the inner catheter, wherein the adapter comprises a first connector connected to the outer catheter and a second connector connected to the inner catheter, wherein the second connector is movable relative to the first connector to slideably move the inner catheter within the outer catheter;

wherein the convertible catheter is configurable as a flush catheter when the inner catheter is slideably moved to expose the at least one flush hole of the outer catheter and the closure device closes the distal end of the inner catheter; and

wherein the convertible catheter is configurable as a selective catheter when the inner catheter is slideably moved to push through and open the closure device with the at least one flush hole of the outer catheter closed by the at least one side of the inner catheter.

11. The convertible catheter of claim 10 , wherein the closure device is an iris.

12. The convertible catheter of claim 11 , wherein the open distal end of the inner catheter is proximal to the at least one flush hole on the at least one side of the outer catheter when the convertible catheter is configured as a flush catheter.

13. The convertible catheter of claim 11 , wherein the open distal end of the inner catheter is pushed up through the closure device when the convertible catheter is configured as a selective catheter.

14. A method of converting the convertible converter of claim 10 as a flush catheter, the method comprising:

slideably moving the inner catheter expose the at least one flush hole; and

closing the distal end of the other catheter using the closure device.

15. A method of converting the convertible converter of claim 10 as a selective catheter, the method comprising:

slideably moving the inner catheter to close the at least one flush hole.

16. The method of claim 15 , further comprising:

pushing the inner catheter to open the closure device.