Multi-Cavity Lead Pin Fixation Tool for Precise Torque Control
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Solution Overview
Problem
Existing fixation tools face difficulties in applying a precise amount of torque to rotate lead terminal pins of varying diameters, leading to potential misinsertion and breakage during the anchoring of medical implantable cardiac leads.
Innovation Solution
A fixation tool with a cavity system in its jaws that accommodates lead terminal pins of different diameters, featuring multiple cavities with varying widths to securely clamp and rotate pins, including ergonomic design elements for intuitive handling and torque application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixation tool is designed with a single cavity for clamping lead terminal pins, then the device structure is simple, but it cannot accommodate lead terminal pins of different diameters
Solution Approach 1:
The single cavity is segmented into multiple cavities (first cavity, second cavity, third cavity) with different widths along the longitudinal axis. Each cavity is configured to receive and clamp lead terminal pins of specific diameter ranges, enabling the fixation tool to accommodate multiple pin sizes without requiring multiple separate tools.
Solution Approach 2:
Instead of creating multiple separate cavities at the same location, the invention extends the cavity system along the longitudinal dimension of the jaw. The cavities are arranged sequentially from distal to proximal, transforming a potential multi-dimensional complexity into a linear one-dimensional solution that maintains structural simplicity while achieving multi-size compatibility.
2Adaptability or versatility
If the jaw opening is made wide to accommodate larger pins, then larger pins can be inserted, but smaller pins cannot be properly centered and clamped
Solution Approach 1:
Different regions of the jaw (different cavities) have different local geometries optimized for specific pin sizes. The first cavity has a wider opening suitable for larger pins, while the second and third cavities have progressively narrower openings for smaller pins. Each cavity's local geometry provides appropriate centering and clamping surfaces for its designated pin size range.
3Ease of manufacture
If a smooth cylindrical pin surface is used, then manufacturing is simple, but torque application and grip are difficult
Solution Approach 1:
The cavity system acts as an intermediary between the fixation tool's gripping mechanism and the smooth cylindrical pin surface. The cavities provide intermediate contact surfaces with appropriate friction characteristics that enable effective torque transmission from the fixation tool to the pin, overcoming the slipperiness of smooth surfaces while maintaining manufacturing simplicity.
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
Facilitates secure and efficient rotation of lead terminal pins of varying diameters, reducing the risk of misinsertion and breakage, and enhancing user comfort through ergonomic design.
Implementation Method 1
a connecting hinge portion arranged between the jaw portion and the handle portion, wherein a pressure exerted on the first and second arms causes an opening of the pair of jaws by means of a pivotal movement of the first arm and the second arm about the connecting hinge portion
Data Source
Figure 1A~1B
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Figure 5~7
AI summary
The present invention relates to a fixation tool for clamping and rotating a lead terminal pin of a medical implantable cardiac lead. The fixation tool comprises a handle portion and a jaw portion, wherein opposing inner surfaces of a pair of jaws of the jaw portion are shaped to form a cavity system between the pair of jaws, the cavity system comprising a first cavity located proximal to an opening at the distal end of the jaw portion and having a first width between the opposing inner surfaces and being shaped to clamp a first lead terminal pin of a first diameter, and a second cavity located proximal to the first cavity and having a second width between the opposing inner surfaces, smaller than the first width and adapted to clamp, together with the first cavity, a second lead terminal pin of a second diameter larger than the first diameter.