Manual Plunger Negative Pressure Wound Therapy Device

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Solution Overview

Problem

Existing negative pressure wound therapy devices are bulky, require a power supply, and need healthcare professionals for operation, limiting user mobility and convenience.

Innovation Solution

A portable negative pressure medical device comprising a suction component with a cylinder body and plunger rod, and a care component that creates a negative pressure environment around a wound area without a power supply, allowing users to independently control the therapy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a powered suction pump is used to generate negative pressure, then the negative pressure can be maintained effectively, but the device becomes bulky and requires electricity, limiting user mobility

Engineering Contradiction:

Improvenegative pressure maintenanceVSAvoiddevice portability

Core Design Contradiction:

ReliabilityVSWeight of moving object

Solution Approach 1:

The patent replaces the electric powered suction pump with a manual plunger rod mechanism. The plunger rod is moved manually within the cylinder body to displace fluid and create negative pressure, eliminating the need for electric motors, power supplies, and bulky mechanical pump assemblies while maintaining the core function of generating negative pressure.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent extracts and removes the electric powered suction pump from the system, retaining only the essential components needed to generate negative pressure manually. By taking out the complex powered system and keeping only the cylinder body, plunger rod, and airtight components, the device becomes portable and easy to use without sacrificing the negative pressure generation capability.

Inventive Principle:

Principle #2Taking out (Extraction)

2Reliability

If a powered suction pump is used, then negative pressure can be generated, but healthcare professionals must operate it, reducing user independence

Engineering Contradiction:

Improvenegative pressure generationVSAvoiduser independence

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent enables the patient to perform negative pressure wound therapy independently by providing a simple manual operation interface. The patient can manually move the plunger rod within the cylinder body to generate negative pressure, monitor it through a pressure indicator, and control the therapy process without requiring healthcare professionals, thereby achieving self-service and user independence.

Inventive Principle:

Principle #25Self-service

3Ease of operation

If a manual plunger rod mechanism is used, then the device becomes portable and easy to operate, but the negative pressure must be generated without a power supply

Engineering Contradiction:

Improvedevice portabilityVSAvoidpower supply requirement

Core Design Contradiction:

Ease of operationVSUse of energy by moving object

Solution Approach 1:

The patent substitutes the electric powered system with a purely mechanical manual operation system. The plunger rod is moved manually by the user, and this mechanical displacement of fluid within the sealed cylinder body generates negative pressure without requiring any power supply, batteries, or electrical components, thereby achieving portability and energy independence.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 users to perform negative pressure wound therapy independently, improving mobility and quality of life by eliminating the need for a bulky power-dependent device and reducing healthcare professional workload.

Implementation Method 1

A plunger rod is disposed in the chamber, such that the plunger rod is movable in a direction along the suction port and the insertion port. The plunger rod abuts an inner peripheral wall of the cylinder body by an airtight component.

Methodology Applied

Scientific EffectNegative pressure: Pressure Gradient

Implementation Method 2

The plunger rod abuts an inner peripheral wall of the cylinder body by an airtight component.

Methodology Applied

Scientific EffectAirtight seal: Physical Containment

Implementation Method 3

The care component is connected to the suction port of the suction component, such that gas of the negative pressure environment flows unidirectionally to the suction component.

Methodology Applied

Scientific EffectUnidirectional flow: Pressure Gradient

Data Source

PatentUS20250186678A1Negative Pressure Medical Device

Publication Date: 2025.06.12 METAL INDS RES & DEV CENT

AI summary

A negative pressure medical device includes a suction component and a care component. The suction component includes a cylinder body having a chamber. One end of the cylinder body has a suction port connected to the chamber. The other end of the cylinder body opposite the suction port has an insertion port. A plunger rod is disposed in the chamber, such that the plunger rod is movable in a direction along the suction port and the insertion port. The plunger rod abuts an inner peripheral wall of the cylinder body by an airtight component. The care component is configured to cover skin around a wound area of a user to maintain a negative pressure environment between the care component and the wound area. The care component is connected to the suction port of the suction component, such that gas of the negative pressure environment flows unidirectionally to the suction component.