Medical Device Discharge Port Guide Surface
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Solution Overview
Problem
Existing medical devices face challenges in effectively aspirating and discharging debris from body lumens, particularly when treating stenosed sites hardened by calcification or located at blood vessel branchings, as debris tends to be retained within the device due to its spread around the rotating drive shaft.
Innovation Solution
A medical device with a rotatable drive shaft featuring a proximal opening portion that extends circumferentially to expose a discharge opening, combined with a discharge port including a discharge hole and a guide surface that protrudes to direct the cut object into the hole, preventing retention and ensuring effective discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the drive shaft rotates to cut the object, then the cutting efficiency is improved, but the debris spreads around the outer periphery and blocks the opening portion, causing retention in the housing
Solution Approach 1:
The discharge port is segmented into multiple discharge holes positioned at different locations, allowing debris to be discharged through multiple pathways rather than a single opening, preventing blockage and improving discharge reliability
Solution Approach 2:
A suction force is introduced as an intermediary force to actively draw debris through the discharge holes, mediating between the rotating cutter and the debris removal process to ensure continuous discharge despite rotation-induced spreading
2Device complexity
If the discharge port is positioned above the proximal portion of the drive shaft, then the structure is simplified, but the cut object may be retained in the housing and not discharged effectively
Solution Approach 1:
The discharge holes are positioned at specific locations on the housing that face the rotational path of the drive shaft, creating localized discharge zones optimized for capturing debris while maintaining overall structural simplicity
Solution Approach 2:
The discharge holes are arranged in multiple directions and positions on the housing, utilizing three-dimensional space to capture debris from different angles generated by the rotating drive shaft, improving discharge efficiency without complicating the basic housing structure
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
The device effectively guides debris from the proximal opening portion to the discharge hole, preventing blockage and ensuring efficient aspiration and discharge, thereby overcoming the retention issues encountered in existing technologies.
Implementation Method 1
an aspiration force is applied, at a handle thereof. The debris formed by cutting is aspirated into a lumen
Data Source
AI summary
A medical device is capable of aspirating an object in a body lumen, while preventing the retention of the object therein, and effectively discharging the object. The medical device includes: a rotatable drive shaft having a lumen; a cutting portion fixed to a distal portion of the drive shaft to cut the object; and a housing that contains a proximal portion of the drive shaft and has a discharge port through which the cut object is discharged. The drive shaft has a proximal opening portion that extends around a portion of a circumference of the drive shaft to expose a discharge opening. The discharge port includes a discharge hole through which the cut object discharged through the discharge opening of the proximal opening portion is discharged from the housing, and a guide surface that protrudes toward the proximal opening portion to guide the cut object into the discharge hole.