Neck protective basket

Abstract

For neck protection technique to prevent migration or protrusion of GDCs, non detachable balloons or microcatheters/wires are used. Non detachable balloon has good protective effect with great effect to the flow in the parent artery which is risky for safe procedure. Microcatheter has little effect to the parent flow and poor protective effect.We have developed retrievable microbasket for neck protective technique which can be delivered and retrieved through standard 18 catheters. These baskets have good protective effect in aneurysm model.

Figure 1

A) Tolerance test in normal saline bath. Basket was placed in normal saline bath freely and platinum electrode touched the basket filament. B) Tolerance test in the glass model of aneurysm. Basket was place in the parent artery of the model. “+” grabber was connected with the delivery wire of IDC and “-” grabber was connected with electrode in normal saline. Basket and delivery wire had no direct connection with the circuit.

Figure 2

Stainless steel baskets were almost invisible. At the same time, platinum baskets were visible but very unclear.

Figure 3

The basket could pass the sharp angled model vessel and standard 18 catheter, The black circle is 1 cm in diameter.

Figure 4

A) With neck protective basket protrusion of coil was controllable. The basket deformed by protrusion, however, the basket pushed back the coil. After retrieve of the basket, IDC was placed in the aneurysm stably. [From 1 to 4] B) Without protective system, IDC protruded into the parent artery. C) Tʼne basket could not control the protrusion in parallel with its arms, completely. This loop in the parent artery was finally replaced in the aneurysm by continuing to push delivery wire, only. D) Schematic drawing of cross section of figure (C).

Figure 5

After 30 minutes electric current (1 mA, 3 V), SEM disclosed erosive change on the surface of arms (A). Macroscopically, the erosion was not noticed. After coating (Teflon) erosive change was not observed (B).