Repositionable Catheter Dressing Sheath for Skin-Safe Access

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Solution Overview

Problem

Existing catheter dressings fail to effectively protect the protruding portion of a catheter, leading to infections and discomfort, while also causing skin irritation and difficulty in accessing the catheter for treatment due to strong adhesives that can detach painfully and damage the skin.

Innovation Solution

A sanitary dressing with a proximal zone using a polyurethane-compatible adhesive that allows repositioning, a detachable joint for easy access to the catheter, and a sheath to enclose the protruding portion, ensuring easy detachment without damaging the primary dressing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a strong adhesive is used to ensure proper fixation of the dressing, then the reliability of fixation is improved, but the patient skin is damaged and discomfort is caused upon removal

Engineering Contradiction:

Improvefixation reliabilityVSAvoidskin damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The adhesive is segmented into two distinct types: a first adhesive on the primary dressing that provides strong fixation to the skin, and a second adhesive on the sanitary dressing that provides gentle repositionable adhesion to the primary dressing. This segmentation allows each adhesive to be optimized for its specific function, resolving the contradiction between strong fixation and gentle removal.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The primary dressing acts as an intermediary layer between the patient's skin and the sanitary dressing. The first adhesive attaches the primary dressing to the skin, while the second adhesive attaches the sanitary dressing to the primary dressing. This intermediary structure allows the strong adhesive to be isolated from direct contact with the skin, preventing skin damage while maintaining reliable fixation.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the adhesive is made strong to prevent detachment, then the reliability of fixation is improved, but the adhesive causes separation of different layers of the sanitary dressing upon removal

Engineering Contradiction:

Improvefixation reliabilityVSAvoiddressing layer integrity

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The adhesive system is segmented into two distinct adhesives with different strengths and functions. The first adhesive provides strong anchoring to the skin, while the second adhesive provides gentle, non-damaging adhesion to the primary dressing. This segmentation prevents the strong adhesive from directly interacting with the sanitary dressing layers, eliminating the risk of layer separation.

Inventive Principle:

Principle #1Segmentation

3Reliability

If the adhesive is made strong to ensure fixation, then the reliability is improved, but the patient skin cannot breathe causing excessive transpiration and irritation

Engineering Contradiction:

Improvefixation reliabilityVSAvoidskin irritation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The adhesive system is segmented so that only the first adhesive on the primary dressing contacts the patient's skin. This primary dressing is designed with breathable properties, allowing skin respiration while maintaining reliable fixation. The second adhesive on the sanitary dressing does not contact the skin, eliminating its potential to cause breathing restrictions or irritation.

Inventive Principle:

Principle #1Segmentation

4Reliability

If a sterile gauze is used to wrap the protruding portion of the catheter, then protection against infections is improved, but access to the catheter for treatment becomes difficult and time-consuming

Engineering Contradiction:

Improveinfection protectionVSAvoidcatheter access

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The sanitary dressing is designed with a dynamic, flexible structure that can be easily opened and closed. The adhesive system allows the dressing to be repositioned and adjusted without complete removal, enabling quick access to the catheter when needed while maintaining protection when not in use. This dynamic design resolves the contradiction between continuous protection and easy access.

Inventive Principle:

Principle #15Dynamics

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 solution provides effective protection against infections, reduces patient discomfort, and facilitates easy access to the catheter without causing skin damage, while maintaining the primary dressing in place for extended periods.

Implementation Method 1

The proximal zone comprises an adhesive compatible with polyurethane, or with a polyurethane film dressing, for enabling repositioning of the sanitary dressing on the primary dressing

Methodology Applied

Scientific EffectAdhesive bonding: Adhesive

Data Source

PatentUS12521528B2Sanitary dressing

Publication Date: 2026.01.13 IBERHOSPITEX SA

AI summary

A sanitary dressing for protecting a portion of a catheter protruding from a patient body through a skin entry site is provided. The sanitary dressing comprises a proximal zone to be arranged on a primary dressing which is in contact with patient skin, a distal zone and an intermediate zone between the proximal and distal zones, thereby forming a sheath for receiving the portion of the catheter. The proximal zone comprises an adhesive compatible with polyurethane for enabling repositioning of the sanitary dressing on the primary dressing.