
In-house manufacture and adaptation of children's wheelchairs, seating shells and electric wheelchairs for children and adolescents

4ma 3ma Rehatechnik GmbH
Dortmund (HQ) · Cologne · HamburgNew on Amplifa
About 4ma 3ma Rehatechnik
4ma 3ma Rehatechnik GmbH specialises in supplying children and adolescents with wheelchairs. The company operates its own workshop at its headquarters in Dortmund and offers both in-house manufacture of especially lightweight children's wheelchairs as custom builds and the individual adaptation of standard wheelchairs from renowned manufacturers such as Meyra, Otto Bock, Pro Activ, SORG and Sopur. Its in-house production includes made-to-measure active wheelchairs, the Duplikart mini wheelchair made of an aluminium frame with glass-fibre-reinforced Lego Duplo elements (total weight 3 kg), tilt wheelchairs with seat tilting, and electric wheelchairs with an anatomically adapted, growing 4ma3ma seating system. In addition, the company adapts electric drives and residual-strength amplifiers from Alber, AAT and SOPUR to standard wheelchairs and supplies handbikes and adaptive bikes. Besides its Dortmund headquarters, the company maintains branches in Cologne and Hamburg.
- Site
- Dortmund
- Processes
- In-house manufacture of wheelchairs (custom builds/made-to-measure children's wheelchairs), Adaptation of standard wheelchairs (Meyra, Otto Bock, Pro Activ, SORG, Sopur) incl. individual, Manufacture of anatomically adapted seating shells/seating systems (4ma3ma seating system, growing), Conversion/adaptation of electric wheelchairs with seating system, Adaptation of electric drives/residual-strength amplifiers to standard wheelchairs (Alber, AAT,, Supply with handbikes/adaptive bikes (also with electric assistance), Consulting, conception and documentation of wheelchair supply, Rehabilitation custom builds (certified field of activity)
- Materials
- Aluminium (frames), Glass-fibre-reinforced plastic (Lego Duplo plate for back shell), Aluminium, Glass-fibre-reinforced plastic
- Certificates
- DIN EN ISO 9001:2015, Prequalification § 126 para. 1 SGB V (Dortmund), Prequalification § 126 para. 1 SGB V (Cologne), Prequalification § 126 para. 1 SGB V (Hamburg), ISO 9001:2015, PQ § 126 SGB V (GPQG)
- Industries
- Rehabilitation technology, Medical supply store / assistive device supply, Paediatric and adolescent rehabilitation
- 01
Consulting and conception of wheelchair supply
- 02
Construction/in-house manufacture or adaptation of the seating systems
- 03
Assembly and adjustment of the wheelchair
- 04
Adaptation to growth and follow-up care
- 05
Documentation of the supply
Materials and Processes
Aluminium
Frame construction of the in-house wheelchairs and the Duplikart to achieve very low weights.
Glass-fibre-reinforced plastic
Anatomically shaped back shell of the Duplikart, made from a glass-fibre-reinforced Lego Duplo plate.
Locations

Dortmund (Baumstraße)
DEHeadquarters, workshop and consulting
- Lot size
- Single-item production (custom build)
- Materials
- Aluminium, glass-fibre-reinforced plastic
- Own workshop for wheelchair construction
Dortmund (Kirchenstraße)
DEFurther certified location (rehabilitation technology and rehabilitation custom builds)
- Lot size
- Single-item production
- Materials
- Aluminium, glass-fibre-reinforced plastic

Cologne (Holweide)
DEBranch, consulting and supply
- Lot size
- Single-item production
- Materials
- Aluminium, glass-fibre-reinforced plastic

Hamburg (Altona)
DEBranch, consulting and supply
- Lot size
- Single-item production
- Materials
- Aluminium, glass-fibre-reinforced plastic
In-House Builds and Products






Inside the production







Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| In-house manufacture of wheelchairs (custom builds/made-to-measure children's wheelchairs)Assembly | – | – | 3 kg (Duplikart, total weight) | – | Aluminium, glass-fibre-reinforced plastic (Lego Duplo plate) |
| Adaptation of standard wheelchairs (Meyra, Otto Bock, Pro Activ, SORG, Sopur) incl. individualAssembly | – | – | – | – | – |
| Manufacture of anatomically adapted seating shells/seating systems (4ma3ma seating system, growing)Assembly | – | – | – | – | – |
| Conversion/adaptation of electric wheelchairs with seating systemAssembly | – | – | – | – | – |
| Adaptation of electric drives/residual-strength amplifiers to standard wheelchairs (Alber, AAT,Assembly | – | – | – | – | – |
| Supply with handbikes/adaptive bikes (also with electric assistance)Assembly | – | – | – | – | – |
| Consulting, conception and documentation of wheelchair supplyEngineering | – | – | – | – | – |
| Rehabilitation custom builds (certified field of activity)Assembly | – | – | – | – | – |
Additional services
Quality and Certification
The company maintains a quality management system in accordance with DIN EN ISO 9001:2015 (ZDH-ZERT, register no. Q1 0110098) for the field of rehabilitation technology and rehabilitation custom builds at both Dortmund locations. In addition, the Dortmund, Cologne and Hamburg locations are prequalified in accordance with § 126 para. 1 SGB V by the GPQG.
| Evidence | Dortmund |
|---|---|
| ISO 9001:2015 | |
| PQ § 126 SGB V (GPQG) |
History
For over 20 years specialisation in the adaptation and in-house manufacture of children's wheelchairs; the exact year of foundation is not specified.