Multi-focus Ultrasound Probe with Lead Screw Actuation

The patent implements a dynamic focus adjustment mechanism that allows the transducer to move between multiple fixed positions (first position and second position) along the acoustic axis. This positioning mechanism enables the focal point to be dynamically changed between different depths within the target, transforming a static focus system into a dynamic one that can adapt to different imaging and treatment requirements.

The patent divides the focus adjustment into discrete segmented positions rather than continuous adjustment. The transducer is positioned at specific predetermined locations (first position for first focal depth, second position for second focal depth), which simplifies the mechanism while providing adequate adaptability for different tissue depths. This segmentation approach balances complexity reduction with functional versatility.

The patent introduces fluid as an intermediary substance between the transducer and the target. This fluid maintains acoustic coupling during transducer movement, allowing the transducer to shift between different positions while the fluid continuously fills the space to ensure uninterrupted sound wave transmission. The fluid acts as a mediator that preserves acoustic contact despite mechanical displacement.

The system employs a self-adjusting fluid filling mechanism that automatically maintains acoustic coupling. As the transducer moves to different positions, the fluid self-adjusts to fill the changing space between the transducer and target, ensuring continuous acoustic contact without requiring external intervention or complex mechanical coupling mechanisms.

The patent implements a single ultrasound probe that performs multiple functions by incorporating a positioning mechanism enabling the transducer to operate at multiple focal depths. This universal probe design eliminates the need for separate specialized probes for different depth requirements, consolidating multiple functions into one device while reducing overall system complexity and cost.

The patent merges the functionality of multiple fixed-focus probes into a single variable-focus probe. By combining the transducer with a positioning mechanism and fluid coupling system, the invention integrates what would otherwise require separate devices into one unified system that provides both shallow and deep focus capabilities through mechanical position adjustment.