| 摘要 |
The present invention relates to a method for making a device assembly and tissue ablation transducer having a plurality of helical elements that can be operated out of phase to orient the acoustical energy beam forward or backward in the longitudinal direction, In one embodiment of the invention the method for making a piezoelectric transducer comprises first providing a ceramic material blank and machining the blank into a tubular configuration. The ceramic tube is coated with a metallic layer. The metal coated ceramic tube is then machined to form an inner electrode and a series of helically intertwined outer electrodes, each outer electrode being associated with a transducer segment. The ceramic material is transformed into a piezoelectric crystal, thus forming a transducer with a series of intertwined individual helical transducer segments. Figure 2A FIG. 1A FIG. lB FIG.IC FIG.ID |
