Impression system with length-adjustable membrane for switching between impression modes for prosthetic sockets

Abstract

Impression system for the production of individual prosthetic sockets, comprising: - a vertical support unit for receiving a patient stump, - a closed, elastic membrane, - an air pressure-based compression system for deforming the membrane, - a manual actuator for axial length adjustment of the membrane, wherein the length adjustment results in a change between a hydrostatic and an elogized impression mode.

Description

Technical field

[0001] The invention relates to an impression device for the production of individual prosthetic sockets in cases of lower extremity amputation. It relates in particular to a vertically usable impression system with a length-adjustable membrane that can be switched between different impression modes by simple mechanical adjustment. State of the art

[0002] Current technology includes impression systems for prosthetic sockets that are based either horizontally on air pressure or vertically on water pressure. These systems are often complex, require external energy sources, and can only be adapted to individual requirements to a limited extent. Switching between different impression modes (e.g., hydrostatic pressure vs. targeted compression in pin-liner technology) requires separate devices. Description of the invention Task

[0003] The invention aims to provide a compact and mobile impression system that allows quick and easy switching between two different impression modes (hydrostatic and pin-liner-like) without changing components or requiring external power sources. Solution

[0004] This problem is solved by an impression system with the features of claim 1. In particular, the system comprises: - a vertical support unit, - a closed, elastic membrane for receiving a stump, - an air pressure-based pressure chamber, and - a manual actuator for axial length adjustment of the membrane.

[0005] Changing the length or axial tension of the membrane alters its mechanical behavior: - In the stub long membrane position, the pressure is distributed evenly across the membrane (hydrostatic pressure mode). - In an extended membrane position, the membrane has a stronger circular effect, which allows for elongation (pin-liner mode).

[0006] The changeover is done without tools, solely through mechanical adjustment, thus allowing for quick adaptation to individual patient requirements. Example of implementation

[0007] An embodiment of the invention is shown in the drawing (attached). It shows a telescopically [5] extendable, vertically positioned impression device [1] with an elastic, funnel-shaped membrane [2] which is attached to the upper mounting [4] by means of an adjusting ring [3]. The length of the membrane can be changed by means of the adjusting ring [3]. - In mode 1 (hydrostatic), the diaphragm is adjusted to the stump length. The internal pressure acts evenly on the stump. - In mode 2 (pin liner), the membrane is lengthened. The material tension changes locally, leading to a differentiated pressure distribution, particularly the lengthening of the soft tissues.

[0008] The impression is taken while standing, with natural weight bearing down. The resulting negative impression, made from suitable material, can be used directly to manufacture a stock.

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