Adjustable Laparoscopic Handle Pivot Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing laparoscopic surgical instruments often force surgeons into non-ergonomic positions, limiting comfort and increasing the risk of physical harm due to handle designs that are dependent on the end effector's position and orientation.
Innovation Solution
A surgical instrument with a handle section that includes a first and second pivot, allowing the handle to pivot independently of the working shaft section, with a ratcheting mechanism and locking system to maintain ergonomic positions and prevent excessive movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the handle position and orientation are tied to the end effector position and orientation, then the instrument structure is simplified, but the surgeon is forced into non-ergonomic positions
Solution Approach 1:
The instrument is divided into independent segments: the handle section can pivot independently from the working shaft section via the first pivot, and the first handle can pivot independently from the second handle via the second pivot. This segmentation allows each section to be positioned ergonomically without being constrained by the position of other sections, resolving the contradiction between ergonomic operation and structural simplicity.
Solution Approach 2:
The instrument incorporates dynamic pivot joints that allow the handle section and handles to be adjusted to different positions and orientations during the procedure. The ratcheting mechanism provides dynamic locking at selected positions, enabling the surgeon to optimize ergonomics while maintaining structural control.
2Ease of operation
If the handle section is made pivotable independent of the working shaft, then ergonomic positions are achieved, but the device complexity increases
Solution Approach 1:
The ratcheting mechanism is designed to be self-latching, automatically maintaining the selected handle position without requiring continuous active control or additional power sources. The surgeon simply releases and repositions the handle, and the mechanism self-locks, reducing the need for complex active control systems.
3Adaptability or versatility
If multiple pivot points are added to the handle, then ergonomic flexibility is improved, but the structural complexity and potential failure points increase
Solution Approach 1:
Instead of using continuous active locking mechanisms that could fail, the design inverts the approach by using passive ratcheting mechanisms that inherently maintain position. The ratchets engage to prevent unwanted movement while allowing controlled repositioning, improving reliability by eliminating the need for continuous active control at multiple pivot points.
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 surgeons to maintain ergonomic positions during procedures, reducing physical strain and improving comfort by allowing independent adjustment of the handle orientation relative to the working shaft, while maintaining the end effector's functional state.
Implementation Method 1
the latch release cavity comprises a spring detent to bias the translational movement of the second handle pivot pin
Implementation Method 2
the ratcheting mechanism includes a release member pivotably connected to a ratchet body and the ratchet body includes a first ramp
Implementation Method 3
a wedge member is disposed between the first ramp and the second ramp and the release member to interact with the first ramp and the second ramp, the wedge member being biased in a distal direction
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Instrument handles are adjustable relative to an end effector of the instrument. The handles may be releasably locked in selected positions and/or orientations relative to the end effector. When the lock is released, the handles may be moved to a different position and/or orientation relative to the end effector, and locked in place. The handles may pivot relative to the end effector around one or more joints. The handles may pivot about an axis of a hinge joint or a point of a ball and socket joint. The axis of the hinge joint may be aligned parallel or perpendicular to a center longitudinal axis of the end effector, or of a shaft between the handles and the end effector.