Coolable Abrasive Drill With Internal Spiral Cooling Passage
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Solution Overview
Problem
Existing grinders for minimally invasive spinal surgeries require large amounts of coolant and fail to effectively cool the grinding rod, leading to thermal damage and complicating the surgical field of vision due to external cooling systems.
Innovation Solution
A grinding drill with a built-in cooling system using a spiral cooling passage and a coaxial multi-tube structure, where cooling water is introduced through an inlet pipe and flows through the grinding rod assembly to cool the inner grinding rod and grinder, reducing thermal damage and optimizing surgical space utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional non-cooled abrasive drills are used, then the drill structure is simple, but the drill bit overheats and loses precision during prolonged use
Solution Approach 1:
The drill bit is nested within a cooling cavity structure, where the cooling fluid passage is integrated into the drill body. The coolant flows through channels within the drill bit itself, creating a nested configuration where cooling infrastructure is embedded within the drilling component, allowing temperature control without adding external complexity
Solution Approach 2:
A cooling fluid acts as an intermediary substance between the drill bit and the surrounding environment. The coolant absorbs heat from the drill bit through thermal conduction and carries it away, serving as a thermal mediator that prevents overheating without requiring direct contact between cooling mechanisms and the drill bit
2Manufacturing precision
If conventional drills without cooling are used, then the device is simple, but bone debris accumulates and affects drilling precision
Solution Approach 1:
The cooling fluid flow is maintained continuously throughout the drilling operation, providing ongoing thermal management and debris evacuation. The coolant continuously circulates through the drill bit channels, ensuring persistent cooling and clearing of bone debris from the cutting edge, maintaining precision throughout the procedure
Solution Approach 2:
The system utilizes fluid dynamics principles where pressurized cooling fluid flows through channels in the drill bit. The hydraulic flow of coolant removes heat and bone debris through pressure-driven flow, utilizing fluid mechanics to achieve both cooling and debris removal functions
3Productivity
If high-speed drilling is performed without cooling, then productivity is high, but heat generation causes loss of precision and bone damage
Solution Approach 1:
The heat generated by high-speed drilling, which is normally a harmful effect, is converted into a beneficial cooling effect. The cooling fluid absorbs the heat at the source (drill bit), transforming the harmful thermal energy into useful cooling action that prevents bone damage while maintaining high drilling speeds
Solution Approach 2:
The system changes the thermal parameters of the drilling environment by introducing cooled fluid. The coolant alters the temperature field around the drill bit, maintaining lower temperatures despite high-speed operation. This parameter change enables high productivity while preventing thermal damage to the bone tissue
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 built-in cooling system effectively reduces thermal damage to tissues and improves surgical efficiency by minimizing coolant usage and enhancing space utilization in complex surgical environments.
Implementation Method 1
cooling fluid to be supplied to the drill bit... to cool the drill bit
Implementation Method 2
high-velocity water jet... to remove bone debris from the site at which the drill bit is drilling
Data Source
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AI summary
The utility model provides a grinding drill with a cooling function for a minimally invasive spinal surgery, including a grinder fixture, a grinding rod assembly, and a grinder. The grinder fixture includes a housing assembly and a sleeve that is detachably connected inside the housing assembly. One end of the grinding rod assembly extends into the housing assembly and is connected to the sleeve through a connecting shaft. An inner grinding rod is rotatably provided in the grinding rod assembly. The grinder runs through the other end of the grinding rod assembly and is connected to the inner grinding rod. An end of the inner grinding rod away from the grinder extends into the sleeve and is rotatably connected to the sleeve through a transmission element. A spiral cooling passage communicated with a water injection hole of the sleeve is provided between an inner wall of the housing assembly and an outer wall of the sleeve. A water inlet of the grinding rod assembly is communicated with the cooling passage through a chamber inside the housing assembly. In the utility model, a coaxial multi-tube structure of the grinding rod assembly reduces the use amount of cooling water and undertakes the delivery of the cooling water in the grinder fixture, replacing a traditional external cooling pipe. The utility model realizes cooling of the high-speed grinding drill, and accelerates the surgical process.