Ultrasonic Bladder Catheter With Cavitation-Focused Drug Delivery
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Solution Overview
Problem
The tight barrier formed by urothelium and glycosaminoglycans in the bladder restricts effective penetration of therapeutic agents during intravesical treatments, limiting the delivery of therapeutic molecules.
Innovation Solution
A catheter with expandable portions and ultrasound transducers is used to increase tissue permeability by forming cavitation bubbles, utilizing a transducer sleeve to protect the transducer and direct therapeutic fluid to the treatment area while preventing cavitation near the transducer surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ultrasound transducers are used to increase tissue permeability through cavitation, then therapeutic agent delivery is improved, but cavitation bubbles may form near the transducer surface causing harmful effects
Solution Approach 1:
An acoustic lens is introduced as an intermediary component between the ultrasound transducer and the bladder wall. The lens focuses the ultrasound waves at a distance from the transducer surface, enabling cavitation to occur in the therapeutic fluid near the bladder wall rather than on the transducer surface itself. This spatial separation allows the harmful cavitation effect to be directed away from the transducer while maintaining therapeutic efficacy.
2Reliability
If the transducer is placed close to the bladder wall for effective treatment, then therapeutic agent penetration is improved, but the transducer may overheat and damage sensitive bladder regions
Solution Approach 1:
The acoustic lens serves as a mediator that enables the transducer to be positioned closer to the bladder wall for effective treatment while preventing direct contact. The lens focuses ultrasound energy at a specific focal point away from the transducer surface, allowing high-intensity ultrasound delivery to the bladder wall without the transducer itself needing to be in direct contact or risking overheating of sensitive regions.
Solution Approach 2:
The acoustic lens changes the spatial dimension of ultrasound energy delivery by focusing waves at a distant focal point rather than immediately adjacent to the transducer surface. This dimensional shift in energy concentration allows the transducer to be positioned close to the bladder wall while the actual therapeutic effect occurs at a controlled distance, preventing direct thermal damage.
3Stability of the object's composition
If expandable portions are used to hold the catheter in position, then treatment stability is improved, but the device complexity increases
Solution Approach 1:
Expandable balloons are used as flexible anchoring elements that can be inflated to hold the catheter in position within the bladder. These thin-film structures provide stable positioning without requiring complex mechanical fixation systems, as the inflated balloons naturally conform to the bladder wall and secure the catheter through pneumatic anchoring.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances the delivery of therapeutic agents by increasing tissue permeability and protecting sensitive bladder regions from excessive energy exposure, ensuring uniform treatment and preventing overheating.
Implementation Method 1
Ultrasound cavitation is a mechanism by which acoustic waves can increase tissue permeability. Cavitation bubbles collapse on the tissues with high energy and open up pores in the tissues, which result in the increased permeability of the tissues to therapeutic agents.
Implementation Method 2
one or more ultrasound transducers mounted on the tube between the two or more expandable portions
Data Source
AI summary
A catheter for ultrasonic-driven bladder therapeutic agent delivery, including: a tube having a proximal expandable portion and a distal end, and at least one transducer sleeve accommodating at least one ultrasound transducer mounted on the tube between the proximal expandable portion and the distal end.