Pipette Tip Groove Design for Low Mounting Force
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Solution Overview
Problem
Conventional pipette tips require high mounting and ejection forces, leading to user strain and potential cumulative trauma disorders, as well as high power consumption in motorized systems.
Innovation Solution
A pipette tip design featuring an elongated, tubular body with a seat region on the inner circumference and at least one axial groove on the outer circumference, allowing for plastic expansion during mounting to create a secure, interference fit with the attachment, thereby reducing the necessary mounting and ejection forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional thick-walled rigid pipette tips are used, then secure clamping and sealing are achieved, but high mounting and ejection forces are required causing user strain and high power consumption
Solution Approach 1:
The pipette tip features a seat region with different wall thickness characteristics compared to the rest of the body. The groove creates a localized thin-walled section (0.1-0.3 mm) in the seat region while maintaining adequate wall thickness elsewhere, allowing local elastic expansion for low-force mounting while preserving overall structural integrity
Solution Approach 2:
The groove geometry and wall thickness parameters are specifically designed to enable elastic deformation within a safe stress range. The thin-walled seat region (0.1-0.3 mm) versus thicker body walls creates a controlled compliance zone that deforms elastically under mounting force (≤5 N) and returns to its original shape, providing secure clamping without requiring high forces
2Reliability
If conventional thick-walled rigid pipette tips are used, then secure clamping and sealing are achieved, but high ejection forces are required causing user strain and high power consumption
Solution Approach 1:
The groove creates a localized elastic compliance zone in the seat region that allows the thin-walled section to deform during mounting and ejection. This local elasticity reduces the force required for ejection while maintaining secure clamping during use, as the elastic deformation energy is released during ejection
Solution Approach 2:
The seat region transitions from a static rigid structure to a dynamic elastic structure through the groove. The thin-walled section can elastically deform during mounting and ejection operations, providing a mechanical spring effect that reduces the force required for ejection while maintaining clamping security during the pipetting operation
3Force
If thin-walled seat region is used, then low mounting and ejection forces are achieved, but structural integrity may be compromised
Solution Approach 1:
The groove creates a localized thin-walled section (0.1-0.3 mm) specifically in the seat region where elastic deformation is desired, while the rest of the pipette tip body maintains adequate wall thickness for structural integrity. This spatial differentiation allows low-force mounting without compromising overall strength
Solution Approach 2:
The elastic compliance is dynamically activated only during mounting and ejection operations when forces are applied to the seat region. During normal pipetting operations, the structure returns to its rigid state, maintaining structural integrity. The dynamic elastic behavior is temporary and reversible, not a permanent weakening
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 design achieves reduced mounting and ejection forces, limiting them to 5 N or less, which minimizes user strain and power consumption, while ensuring a secure, sealing connection with the pipette tip attachment.
Implementation Method 1
the tubular body is configured so that it is plastically expanded in the circumferential direction within the groove upon mounting the pipette tip with a maximum mounting force of 5 N, preferably of 3.3 N, more preferably 3 N, by the seat region on an attachment
Data Source
AI summary
A pipette tip comprises a tubular body including an inner circumference and an outer circumference. The tubular body comprises a bottom opening defined at a bottom end of the tubular body and a top opening defined at a top end and configured to clamp onto an attachment of a pipetting device. A seat region is positioned proximate the top opening on the inner circumference and configured to engage an attachment of a pipetting device. At least one groove is defined on the outer circumference. The tubular body is configured to plastically expanded in a radial direction within the at least one groove upon mounting the seat region on the attachment. The attachment comprises a larger diameter than at least part of the seat region to form an interference fit between the attachment and the at least part of the seat region when the pipette tip is clamped onto the attachment.