University of Alicante

The device of the invention is based on a modular system (see Figure 1) that enables its multifunctionality through the interchange of its various modules, thereby facilitating its adaptation to the specific requirements of each task or activity.

Figure 1: Modules of the multifunctional prosthesis

The modules that make up the system are as follows:

a) “Socket” (Fig. 1-a): This is the part of the prosthesis that attaches to the user. It is designed using a scan of the patient’s limb to customise it and adapt it to their anatomy. Additionally, there is the option to use a harness around the top of the socket to increase stability and facilitate correct posture for the user.

b) Telescopic system (Fig. 1-b): This is the body of the device, consisting of a variable-length extension system using an outer and inner tubular component that allows the user to adjust the length of the prosthesis to up to four different positions. This system comprises a coupling mechanism (hammer-type or similar) with the socket and a coupling (distal or similar) to the interchangeable gadget.

c) Gadget (Fig.1-c): This is the module that provides the prosthesis with its multifunctionality. It can be easily swapped out, and different gadgets are designed according to the functionality required by the user.

It is worth noting that, thanks to their minimalist and functional design, the connections between the different modules of the prosthesis eliminate the need for any external fasteners, simplifying assembly, reducing points of failure, improving the cleanliness and hygiene of the device, and facilitating its adaptation to different users without the need for additional tools.

MAIN ADVANTAGES OF THE TECHNOLOGY

It is worth highlighting the numerous advantages of the device:

• The alternative devices mentioned above operate using cables or electromechanical mechanisms, which increases the cost of the product. However, the prosthesis described in this invention features a design with simple mechanical joints that are manufactured directly using 3D printing. Consequently, the assembly and replacement of modules is straightforward for the user, directly leading to increased self-sufficiency during various activities.

• The socket is easily customisable and adaptable to the user’s anatomy, even allowing for the manufacture of different standardised models and/or models of varying dimensions to ensure a better fit and greater comfort for users. Furthermore, the material used is lightweight, biocompatible, flexible, adaptable and comfortable. Moreover, its simple fit allows the patient to fit the prosthesis themselves in most cases. Additionally, it incorporates a further adjustment at the shoulder to improve posture during prolonged use or for certain functions requiring greater strength.

• The telescopic shaft allows the total length of the prosthesis to be adjusted to suit different scenarios, ensuring the ergonomics and usability of the prosthesis.

• Thanks to the modular design of the device and the ability to easily swap heads depending on the activity, it offers clear advantages over other commercial models, providing different functionalities with a single device. These heads or gadgets can be standard for all users and can be adapted to various everyday tasks (eating, grasping objects, etc.), unlike commercial models, which feature either a very specific hook for a particular task or an aesthetically realistic silicone hand, but with little practical use.

INNOVATIVE ASPECTS

The manufacturing process utilises 3D printing technology, which facilitates rapid customisation and adaptation to different users, without the need for moulds and at low cost. The cup (Fig. 1-a) is manufactured using a flexible, washable, biocompatible material that is comfortable for direct contact with the user, ensuring an ergonomic and comfortable fit during prolonged use. The body of the device (Fig. 1-b and Fig. 1-c) is manufactured using a flexible, impact-resistant material with high heat tolerance. The heat tolerance of this material facilitates cleaning and ensures that its use maintains adequate hygienic standards, for example, when handling food.

A prototype of the prosthesis has been developed and has already been validated by its end users.

Essentially, it is aimed at the assistive and rehabilitation products sector, that is, the range of companies, services and professionals that develop and provide tools to improve mobility, recovery and quality of life for people with injuries, illnesses or physical limitations.

We are seeking manufacturers of assistive and rehabilitation products who are interested in validating and commercialising this product (through licensing agreements) or in designing new devices.

This technology is protected by patent application:

• Patent title: “Prótesis adaptable a una extremidad de un usuario”.

• Application number: P202531260

• Application date: 29/12/2025