Torque-Transmitting Insertion Device With Vacuum-Stiffening Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Prior art insertion devices fail to reliably connect and disconnect from instruments like endoscopes while transmitting torque and varying in flexibility, making them difficult to use effectively in medical procedures.
Innovation Solution
A torque-transmitting, variably-flexible locking insertion device with a hollow body, handle, and vacuum-activated mechanism that transitions between flexible and stiff conditions, using a corrugated tube and tendons to maintain stiffness without tension or compression, and a clamping plate for secure locking and unlocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the insertion device is lightly engaged to the colonoscope and rotates independently, then the device can follow the lumen easily, but the device cannot transmit torque reliably to the instrument
Solution Approach 1:
The insertion device employs a dynamic coupling mechanism that transitions between locked and unlocked states. The locking mechanism includes movable locking elements that engage with corresponding features on the instrument when torque is applied, creating a rigid connection for reliable torque transmission while allowing independent rotation when unlocked to follow the lumen easily.
Solution Approach 2:
The device changes its mechanical coupling parameters between two states: a flexible state where the device can rotate independently to navigate the lumen, and a rigid state where locking elements engage to transmit torque reliably. This parameter change is achieved through spring-loaded locking mechanisms that respond to applied forces.
2Device complexity
If the insertion device has fixed and predetermined flexibility, then the structure is simple, but the device cannot be both torque-transmitting and easily releasable
Solution Approach 1:
The insertion device incorporates a dynamic flexibility control mechanism that allows the operator to switch between flexible and rigid states. This is achieved through a locking system with movable elements that can engage or disengage based on operational needs, providing adaptability without significantly complicating the overall structure.
Solution Approach 2:
The device is segmented into functional zones with different flexibility characteristics. The distal end maintains greater flexibility for navigation, while the proximal end provides structural support. The locking mechanism segments the torque transmission path, engaging only when needed, thus maintaining relative structural simplicity while providing variable flexibility.
3Reliability
If the device uses a fixed locking mechanism, then torque transmission is reliable, but the device cannot be easily released from the instrument
Solution Approach 1:
The locking mechanism is designed as a dynamic system with movable locking elements that can be easily actuated. When torque is applied during insertion, the locking elements automatically engage to provide reliable torque transmission. For release, an actuator or simple mechanical action disengages the locking elements, allowing easy separation from the instrument.
Solution Approach 2:
The locking mechanism incorporates self-locking features where the act of inserting and torquing the device automatically engages the locking elements without requiring separate actions. The spring-loaded design allows the locking elements to engage passively when force is applied, while release can be achieved through a simple actuator that overcomes the spring force.
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
Enables reliable locking and unlocking of instruments while allowing for variable stiffness and torque transmission, enhancing the operator's ability to manipulate and advance instruments during medical procedures.
Implementation Method 1
a device for transitioning the hollow body between a relatively flexible condition and a relatively stiff condition, and tendons disposed within the hollow body for maintaining the hollow body in the relatively flexible and relatively stiff conditions
Implementation Method 2
the transitioning device applies suction between the outer jacket and the corrugated tube to frictionally locking the tendons in place
Data Source
AI summary
A variably-flexible, locking insertion device includes a hollow body having a proximal end with an entrance for receiving an instrument, a distal end with a tip for protrusion of the instrument, and a handle to be gripped by an operator. A device transitions the hollow body between a relatively flexible condition and a relatively stiff condition. Tendons are disposed within the hollow body for maintaining the hollow body in the relatively flexible and relatively stiff conditions, the tendons being neither in tension nor compression when the hollow body is in the relatively stiff condition.