Endoscopic Needle and Knife Limiting Units
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Solution Overview
Problem
Conventional medical devices used with endoscopes for treatments like tissue collection and medicine injection are cumbersome due to complex operation mechanisms, such as rotating stoppers and valves, which increase the time and effort required for procedures.
Innovation Solution
A medical device with fine needle aspiration and incision devices that utilize limiting units with external force-activated and spring-restored mechanisms, allowing for simpler operation by adjusting the protruding lengths of needles and knives, and controlling the connection between needles and syringes with easy-to-use gripping parts and stoppers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rotating valve or bolt mechanism is used to control the cock or stopper, then the device can reliably open or close passages and fix limiting positions, but the operation becomes cumbersome and time-consuming
Solution Approach 1:
The patent replaces the traditional rotating valve mechanism with a sliding cock that moves linearly along the injection needle tube. The cock includes a sliding portion that can be pushed along the tube by the operator, and a blocking portion that blocks the passage when positioned at the end of the tube. This linear sliding motion substitutes for the complex rotating motion, making operation simpler and faster while maintaining reliable passage control.
Solution Approach 2:
The patent extracts the limiting function from a separate rotating stopper mechanism and integrates it directly into the cock structure. The cock itself serves dual purposes: controlling the passage and limiting the protruding length of the needlepoint. By combining these functions into a single component, the patent eliminates the need for a separate stopper operation, reducing the number of manual operations required.
2Reliability
If a rotating valve mechanism is used to control the cock, then the passage can be reliably opened and closed, but the operation time increases
Solution Approach 1:
The patent replaces the rotating valve mechanism with a linear sliding cock that can be quickly pushed along the injection needle tube. The sliding portion moves in a straight line parallel to the tube axis, which is a simpler and faster motion than rotation. The blocking portion quickly engages with the tube end to seal the passage, reducing the time required for operation while maintaining reliable passage control.
3Reliability
If a bolt-type stopper is used to limit needle protrusion, then the limiting position can be securely fixed, but the operation becomes cumbersome and time-consuming
Solution Approach 1:
The patent extracts the limiting function from a separate stopper mechanism and integrates it into the cock structure. The cock serves dual purposes: controlling the passage and limiting the protruding length of the needlepoint. When the cock is pushed to the end of the injection needle tube, its blocking portion simultaneously limits the needlepoint protrusion, eliminating the need for a separate stopper operation.
Solution Approach 2:
The patent merges the passage control function and the limiting function into a single cock component. The cock includes a sliding portion for passage control and a blocking portion for limiting needle protrusion. By combining these functions into one component, the patent reduces the number of manual operations required while maintaining reliable limitation of the needle protruding length.
4Reliability
If a bolt-type stopper is used to limit knife protrusion, then the limiting position can be securely fixed, but the operation becomes cumbersome and time-consuming
Solution Approach 1:
The patent extracts the limiting function from a separate stopper mechanism and integrates it into the cock structure for the incision device. The cock serves dual purposes: controlling the passage and limiting the protruding length of the knife. When the cock is pushed to the end of the knife tube, its blocking portion simultaneously limits the knife protrusion, eliminating the need for a separate stopper operation and reducing operation time.
Solution Approach 2:
The patent merges the passage control function and the limiting function into a single cock component for the incision device. The cock includes a sliding portion for passage control and a blocking portion for limiting knife protrusion. By combining these functions into one component, the patent reduces the number of manual operations required while maintaining reliable limitation of the knife protruding length.
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 enables simpler and safer operations by allowing for quick adjustments of needle and knife protrusions and syringe connections with minimal operator effort, reducing the risk of device shaking and tissue damage.
Implementation Method 1
a spring that applies an elastic force to the core in the second direction
Data Source
AI summary
A medical device is provided that includes a fine needle aspiration device and an incision device, which are inserted into a body with an endoscope. The fine needle aspiration device includes an injection needle and an injection needle tube, which surrounds the injection needle. A first limiting unit limits the length of the needlepoint of the injection needle protruding from the injection needle tube. A syringe is connected to the injection needle for tissue collection and medicine injection. A second limiting unit limits the connection between the injection needle and the syringe. The incision device includes a knife and a knife tube that surrounds the knife. A third limiting unit limits the length of the cutting edge of the knife protruding from the knife tube.