Volume Reduction Catheter Cutter Head for Smooth Tissue Decomposition
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Solution Overview
Problem
Existing endovascular volume reduction devices for lower extremity arteriosclerosis obliterans suffer from non-smooth transfer processes and low overall work efficiency due to incomplete decomposition of excess tissue during cutting.
Innovation Solution
A medical cutting assembly with a cutter head and limiting member, featuring cutting edges and decomposing portions, which rotate relative to each other to cut and decompose excess tissue effectively, and a volume reduction catheter system with a transfer section for smooth tissue transfer and decomposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional PTA is used to expand stenosis segment, then the procedure is simple and minimally invasive, but excess tissue cannot be removed and barotrauma and dissection easily occur
Solution Approach 1:
The patent combines PTA expansion function with endovascular volume reduction cutting function into a single integrated device. The cutter head with cutting edges is positioned within the balloon catheter, allowing simultaneous or sequential performance of both PTA and plaque removal procedures, thereby maintaining procedural simplicity while improving treatment effectiveness by removing excess tissue that causes rebound and restenosis
Solution Approach 2:
The medical cutting assembly is designed as a multi-functional device that can perform both angioplasty (through the balloon expansion mechanism) and plaque removal (through the rotating cutter head with cutting edges). This universal design allows a single device to address multiple treatment needs, eliminating the requirement for separate procedures and improving overall treatment reliability
2Productivity
If existing endovascular volume reduction device cuts excess tissue, then tissue removal is achieved, but decomposition is not thorough and transfer process is not smooth
Solution Approach 1:
The limiting member is segmented into multiple decomposing portions spaced apart along the axial direction, creating multiple decomposition zones within the device. This segmentation allows progressive decomposition of cut tissue as it passes through each zone, ensuring thorough breakdown into small particles that can be smoothly transferred and discharged, thereby improving overall work efficiency without sacrificing tissue removal productivity
Solution Approach 2:
The device enables continuous cutting and decomposition actions to occur simultaneously during a single rotation cycle. The cutter head continuously cuts tissue while the decomposing portions continuously decompose the cut tissue in real-time, eliminating idle time between cutting and decomposition operations. This continuous useful action maximizes productivity while minimizing time loss, improving overall work efficiency
3Productivity
If cutter head rotates to cut tissue, then cutting function is achieved, but axial movement control is insufficient
Solution Approach 1:
The limiting member acts as an intermediary component between the cutter head and the operator control system. It mechanically translates the rotation of the cutter head into controlled axial movement through the engagement between decomposing portions and the cutter head surface. This intermediary mechanism ensures that high-speed cutting is accompanied by precise axial position control, maintaining both cutting productivity and cutting depth precision
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 system achieves thorough cutting and decomposition of excess tissue, improving the efficiency of tissue transfer and discharge, enhancing the overall work efficiency of the procedure.
Implementation Method 1
the cutter head includes a cutting portion; the cutting portion includes a plurality of cutting edges extending from a proximal end to a distal end
Implementation Method 2
when the cutter head and the limiting member rotate relative to each other, the decomposing portion extends through the delivery portion
Data Source
AI summary
A medical cutting assembly (10) and a volume reduction catheter system are provided. The medical cutting assembly (10) includes a cutter head (101) and a limiting member (102) connected to the cutter head (101), where the cutter head (101) includes a delivery portion (1012); the limiting member (102) includes a decomposing portion (1021); and when the cutter head (101) and the limiting member (102) rotate relative to each other, the decomposing portion (1021) extends through the delivery portion (1012). The volume reduction catheter system includes a cutting section and a transfer section. The delivery portion (1012) can transfer excess tissue cut by the cutter head (101) from a distal end to a proximal end. The limiting member (102) is provided with the decomposing portion (1021). When the cutter head (101) and the limiting member (102) rotate relative to each other, the decomposing portion (1021) extends through the delivery portion (1012), such that the decomposing portion (1021) rotating at a high speed further cuts and decomposes the cut tissue in the delivery portion (1012) into smaller tissues, so as to achieve improved decomposition of the tissue in order to facilitate the subsequent discharge of the excess tissue.