Handle for interchangeable medical device
View Patent ↗A rigid extractor is revealed, a rigid device for use in percutaneous procedures to remove kidney stones directly from the kidneys. The rigid extractor uses a handle fixed to an outer rigid cannula, and an inner cannula to control an extraction device that may be removable from the inner cannula. The extractor is desirably used with a fluoroscope, in which the surgeon maneuvers the extractor with the aid of a view of the operating field provided by the fluoroscope. The surgeon then maneuvers the extractor to grasp the kidney stones and remove from the patient. The extractor may also be used with a nephroscope. The device may be used with a removable extraction device such as a basket, a grasper a pair of jaws, or a pair of scissors.
1. An extractor for removing an object from a location within a body, the extractor comprising:
an inner cannula with a proximal end comprising a restriction member and a distal end, the distal end having a removable extraction device;
an outer cannula;
a handle having a first end and a second end, the first end fixedly attached to the outer cannula and the second end removably receiving the restriction member,
the second end comprising a hollow portion defining a central slot configured to slidably receive the restriction member, two side slots are defined blindly along opposite walls of the second end; and
further comprising a cap with two lip portions that are configured to be slidably received within the two side slots when the cap is disposed upon the second end.
2. The extractor of claim 1 , wherein the second end of the handle includes an open-top cavity in communication with the slot, the slot opening towards the first end of the handle.
3. The extractor of claim 2 , wherein the central slot is sized such that the inner cannula is capable of free movement along the length of the central slot.
4. The extractor of claim 1 , wherein the inner cannula includes a threaded portion at its distal end, and the removable extraction device has a mating threaded portion at its proximal end.
5. The extractor of claim 4 , wherein the threaded portion of the extraction device is disposed about 5 mm to about 10 mm from the most distal portion of the extraction device.
6. The extractor of claim 1 wherein the inner cannula includes a snap-fit portion at its distal end, and the removable extraction device has a mating snap-fit portion at its proximal end.
7. The extractor of claim 1 wherein the inner cannula is a solid rod.
8. The extractor of claim 1 , wherein the removable extraction device includes a Nitinol alloy.
9. The extractor of claim 1 wherein the extraction device is chosen from a group consisting of a three-prong grasper, a two-prong grasper, and a multiple-wire basket.
10. The extractor of claim 1 wherein the extraction device includes at least one superelastic wire loop, and the at least one superelastic loop forms a reversibly collapsible, tipless, atraumatic basket.
11. The extractor of claim 1 , wherein the handle is made from nylon and is from about 0.15 to about 0.30 inches thick and from about 0.125 inches to about 0.75 inches wide.
12. The extractor of claim 1 , wherein the handle is made from plastic and is from about 0.15 to about 0.30 inches thick.
13. The extractor of claim 1 , wherein the handle is made from metal and is from about 0.15 to about 0.30 inches thick.
14. The extractor of claim 1 , wherein each of the two side slots have an arcuate central notch defined therein.
15. The extractor of claim 1 , wherein each of the two side slots have arcuate bottom notches configured to receive the lip portions therein when the cap is disposed upon the second end.
16. The extractor of claim 1 , wherein the cap has slot disposed in registry with the central a slot when the cap is disposed upon the second end.