Catheter Locking Cap Prevents Vent Plug Loss

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Solution Overview

Problem

The vent plug in catheter assemblies often falls off during shipping or transport, leading to contamination risks and product rejection due to loss of sterile integrity.

Innovation Solution

A catheter system with a locking cap mechanism that includes a female luer adapter and a cap with protrusions and slots, allowing secure locking and unlocking to prevent accidental removal, ensuring the vent plug remains in place and maintains sterility.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a vent plug is used to protect the luer adapter and maintain sterile environment, then product sterility is improved, but the vent plug falls off during shipping or transport causing loss of product integrity

Engineering Contradiction:
Improvesterile environment maintenanceVSAvoidvent plug retention
Core Design Contradiction:
ReliabilityVSStability of the object's composition

Solution Approach 1:

The cap is divided into multiple functional components: a cap body with a male luer, arms extending from the cap body, slots formed in the arms, and protrusions on the female luer adapter. This segmentation allows each component to perform its specific function while working together to secure the vent plug during transport.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The cap with male luer is inserted into the female luer adapter, creating a nested structure. The protrusions on the female luer adapter extend into the slots in the cap arms, forming an interlocking nested arrangement that prevents the cap from detaching during shipping while maintaining sterile integrity.

Inventive Principle:
Principle #7Nested doll (Nesting)

2Stability of the object's composition

If a locking mechanism with protrusions and slots is implemented, then the cap retention is improved, but the device complexity increases

Engineering Contradiction:
Improvecap retentionVSAvoidlocking mechanism structure
Core Design Contradiction:
Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The cap serves multiple functions: it protects the female luer adapter, provides a locking mechanism through its arms and slots, and maintains sterile environment. The female luer adapter also serves dual purposes as both a connector and a locking component with its protrusions. This multi-functionality reduces the need for separate dedicated locking components.

Inventive Principle:
Principle #6Universality (Multi-functionality)

Solution Approach 2:

The locking mechanism is passive and self-contained. The protrusions on the female luer adapter automatically engage with the slots in the cap arms when the cap is installed, providing automatic locking without requiring additional actuators, springs, or complex mechanisms. The structure locks itself through its geometric configuration.

Inventive Principle:
Principle #25Self-service

Data Source

PatentUS20230233830A1Catheter system having a locking cap
Publication Date: 2023.07.27 BECTON DICKINSON & CO
  • US20230233830A1 patent drawing
  • US20230233830A1 patent drawing
  • US20230233830A1 patent drawing

AI summary

A catheter system may include a cap, which may include a top. The cap may include a male luer extending distally from the top and inserted into a proximal end of a female luer adapter of the catheter system. The cap may include a first arm and a second arm extending distally from the top. The first arm may include a first slot, and the second arm may include a second slot. The first protrusion may be disposed within the first slot and the second protrusion may be disposed within the second slot. The cap may include a collar extending distally from the top. An inner surface of the collar may include a first undercut and a second undercut. The first protrusion may be disposed within the first undercut and the second protrusion may be disposed within the second undercut.