Balloon Catheter Protrusion Geometry for Calcified Stenosis Incision
Solution Overview
Problem
Conventional balloon catheters face challenges in ease of insertion into body cavities, pushability, and efficiency in incising stenotic lesions, particularly in calcified or ISR lesions.
Innovation Solution
A balloon catheter design with a balloon body featuring a straight tubular part, proximal and distal tapered parts, and protrusion parts that have specific height-to-width ratios, allowing for enhanced pushability and efficient incision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a standard balloon catheter is used, then the structure is simple and easy to insert, but it cannot effectively dilate calcified or ISR lesions
Solution Approach 1:
The balloon catheter incorporates protrusion parts with specific geometric characteristics (height H1, width W1, and ratio W1/H1 ≥ 0.5) localized in the distal tapered part, while other portions maintain standard balloon structure. This local modification enables effective engagement with calcified or ISR lesions without requiring complete structural redesign, thus improving lesion dilating capability while maintaining overall device simplicity
Solution Approach 2:
The protrusion parts are designed with asymmetric geometric parameters where the height H1 and width W1 satisfy W1/H1 ≥ 0.5, creating an optimized contact geometry with the lesion. The asymmetric distribution of protrusions in the distal tapered part provides directional engagement capability that improves effectiveness against hardened lesions without proportionally increasing device complexity
2Productivity
If the balloon is made rigid to incise stenosis effectively, then incision efficiency improves, but pushability and ease of insertion deteriorate
Solution Approach 1:
The balloon catheter is segmented into distinct functional zones: a distal tapered part with protrusion parts for effective stenosis incision, and proximal portions with standard or reduced protrusion characteristics that maintain flexibility. This segmentation allows the distal end to be sufficiently rigid for incising calcified or ISR lesions while keeping the overall catheter pushable and easy to insert through body cavities
Solution Approach 2:
The balloon employs controlled parameter variations in protrusion geometry along its length, with the distal tapered part featuring protrusions where W1/H1 ≥ 0.5 for effective incision, while other portions have reduced or no protrusions. This parameter gradient enables localized stiffness enhancement at the treatment site without compromising the overall flexibility and pushability of the catheter during insertion
Data Source
AI summary
Provided is a balloon for a balloon catheter that is easy to insert in a body cavity, has good pushability, and can easily incise a stenosis. A balloon for a balloon catheter, having a balloon body (20), the balloon body (20) having a protrusion part (60) that projects outwardly in the radial direction y from its outer surface in the straight tubular part (23) and the proximal tapered part (22), wherein a ratio W1/H1 of a height H1 of the protrusion part (60) and a width W1 of the protrusion part (60) in the straight tubular part (23) is greater than a ratio W2/H2 of a height H2 of the protrusion part (60) and a width W2 of the protrusion part (60) in the proximal tapered part (22).