Rotablator Cooling Pump for Thermal Damage Control
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Solution Overview
Problem
Existing rotational atherectomy devices fail to timely and effectively adjust the flow rate of the cooling solution during the atherectomy process, leading to thermal damage to blood vessel tissues and potential complications like slow blood flow/no reflow.
Innovation Solution
A rotational atherectomy device with a drive shaft connected to a rotary grinding assembly, a liquid feeding pipe, and a pumping liquid member that is driven by the drive shaft to deliver cooling solution at varying flow rates based on the rotation speed, using a coaxial or transmission mechanism to ensure precise control over the infusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a pressure bag or infusion pump is used to deliver cooling solution, then the cooling solution can be delivered to the distal end of the catheter, but the flow rate cannot be timely and effectively adjusted according to the actual rotational atherectomy situation
Solution Approach 1:
The patent combines the cooling solution delivery function with the rotational atherectomy device itself by integrating a pumping liquid member (such as a gear pump or piston pump) directly into the device structure. This merging eliminates the need for separate external infusion pumps or pressure bags, enabling direct flow rate control at the distal end while reducing overall system complexity.
Solution Approach 2:
The rotational atherectomy device performs its own cooling solution delivery through the integrated pumping liquid member, which is driven by the same drive shaft that rotates the grinding head. This self-service mechanism allows the device to autonomously adjust and deliver cooling solution according to the actual atherectomy conditions without requiring external control systems.
2Object-affected harmful factors
If cooling solution is infused during rotational atherectomy, then thermal damage to blood vessel tissues is reduced, but the flow rate cannot be effectively controlled to match the grinding process
Solution Approach 1:
The integrated pumping liquid member responds to the rotational speed of the grinding head (which reflects the actual atherectomy intensity) by automatically adjusting the cooling solution flow rate. This feedback mechanism ensures that the cooling solution delivery is dynamically matched to the heat generation from the grinding process, effectively preventing thermal damage while maintaining ease of operation.
Solution Approach 2:
The cooling solution flow rate is made dynamic rather than static, allowing it to vary in real-time according to the rotational speed of the grinding head. This dynamic adjustment ensures optimal cooling during high-speed grinding while reducing flow during lower-speed operations, improving both thermal protection and operational ease.
3Productivity
If high-speed rotation of the grinding head is used to ablate lesions, then calcified or fibrotic atherosclerotic plaques are effectively removed, but thermal damage to surrounding tissues increases
Solution Approach 1:
The patent converts the harmful thermal effect of high-speed grinding into a beneficial controlled process by using the rotational energy itself to drive the pumping liquid member. The same rotation that generates heat also powers the cooling solution delivery, creating a self-regulating system where the cooling flow is directly proportional to the heat generation, thus preventing thermal damage while maintaining high ablation efficiency.
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 solution effectively adjusts the flow rate of the cooling solution to manage thermal damage, preventing complications such as slow blood flow/no reflow by ensuring timely and adequate flushing of debris and heat dissipation.
Implementation Method 1
a pumping liquid member in transmission connection with the drive shaft, and the pumping liquid member being capable of delivering liquid toward a distal end of the liquid feeding pipe through the liquid feeding cavity when driven by the drive shaft
Implementation Method 2
Since heat will be generated during the process of grinding up lesions, in order to reduce the thermal damage to blood vessel tissues and blood, during the rotary grinding process a cooling solution (such as saline) needs to be infused to cool and flush the debris and microparticles that are ground off
Data Source
AI summary
A rotablator apparatus (10), comprising a rotablator assembly (11), a drive shaft (12), a liquid passing pipe (14), and a liquid pumping part (15). A distal end of the drive shaft (12) is connected to the rotablator assembly (11) and is used for driving the rotablator assembly (11) to rotate. The liquid passing pipe (14) is sleeved on the drive shaft (12), and the liquid passing pipe (14) is provided with a liquid passing cavity (141). The liquid pumping member (15) is in transmission connection with the drive shaft (12), and driven by the drive shaft (12), can convey liquid to the far end of the liquid passing pipe (14) by means of the liquid passing cavity (141).