: infant prosthetic design
: infant prosthetic design
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'Muscle sensor movement Robotics used to control:
'Muscle sensor movement Robotics used to control:
a system of small motors. linked to tendons which actuate the movement of the fingers,
a system of small motors. linked to tendons which actuate the movement of the fingers,
thumb, wrist, elbow and shoulder'
thumb, wrist, elbow and shoulder'
Researching the design of robotic hands which are controlled by the muscle movements form the residual limb
of individuals who have experienced limb loss.
Using muscle movement sensors attached to the patient's residual limb, it's possible to control the movement of the robotic hand.
AI Chat GPT to generate diagrams, and the gorgeous 3D images, on the site.
Also, for obtaining Arduino code, for controlling the robotic systems,
and onshape free cad for inner mechanical design and creating 3D print designs (.stl files).
+ Big Thanks to: Chat GPT [AI] and Onshape [free CAD] and Arduino [microcontroller] and Elegoo [Starter kit] +
LATEST UPDATE: New Tendon design for child sized robotic prosthetic hand, fingers only 52mm long! All fingers are nearly complete and ready to assemble to palm base, wherein there are four linear motors which pull the lower tendon and close the fingers, the upper tendon, acts like a spring and returns the finger to a straight position. Another motor at the wrist area of the palm will allow the fingers to span, as if playing the piano keyboard! The thumb design is also ready, to be made in Onshape!! Not too long before I can show some animations of it's differing positions.
1st finger Child prosthetic Main Hand knuckle, front view.
1st finger Child prosthetic Main Hand knuckle, Side view.
BELOW:
1st finger Child prosthetic Proximal Phalanx, Middle Phalanx, and Distal Phalanx Bone.
BELOW: The 1st Finger Assembly and to the right a plan view of the main hand knuckle and Proximal Bone.
2 year old Arm for hand
Dorsal & Palmar ~ two halves
The 'Harness/Torso' Design
🌟 A New Vision for Child Prosthetics 🌟
🌟 A New Vision for Child Prosthetics 🌟
Testimony
One day, the prosthetics industry will finally embrace a truly child-centered vision — one that values cuteness, comfort, and emotional connection, alongside precision mechanics, Arduino control, and beautifully engineered STL prints. Prosthetics should be life-like, expressive, and joyful.
Imagine:
Imagine:
🖐️ A soft, lightweight, realistic hand — sized for a toddler or child — that’s as friendly to wear as a glove.
⌚ An Arduino control unit worn like a stylish smartwatch, with a touchscreen interface a child can learn to love.
🧠 Tactile sensors embedded in each fingertip, providing real-time feedback on pressure, grip, and even texture — so the child doesn’t just move the hand…
they feel with it.
⚡ And soon — with EEG brainwave integration — the possibility of controlling the hand just by thinking, making the system not only intuitive, but revolutionary.
What the future won't be:
What the future won't be:
✘ Oversized or clinical
✘ Mechanical-looking
✘ Scaled-down adult tools
What the future can be:
What the future can be:
✔ Emotionally engaging and beautiful
✔ Lightweight and sensor-smart
✔ Capable of intuitive control — even by thought
This hand responds to movement from Sensors powered by Arduino logic, but it can also adapt in real-time
— giving the child a true sense of touch and, eventually, mind-driven movement.
Gorgeous renders for the outside of the 2yr Childs hands and feet:
The images below, were made using Chat GPT, they are based on a 2 year old child's hand. I have zoomed in quit a lot on these images, so you can see the detail.
Use the below images, to make 3D printable STL files, of hands and feet, for realistic prosthetic development work, SEE HERE:
idea for 3 finger stumps Prosthesis:
idea for 3 finger stumps Prosthesis:
System Architecture (Straightforward + Efficient)
System Architecture (Straightforward + Efficient)
(with actuator-as-button pop-up motion)
(with actuator-as-button pop-up motion)
🧠 Inputs:
🧠 Inputs:
1 IMU per finger stump (e.g. MPU6050, mounted near the natural knuckle) This detects the horizon line.
Arduino Nano reads the pitch angle from each IMU
🧠 Logic Flow:
🧠 Logic Flow:
User flexes finger stump (rotates pitch downward)
IMU detects the pitch change
Nano activates a tiny actuator that behaves like a button pop-up
This actuator produces ~10 mm of linear motion upward
Could be a mini solenoid, SMA wire, or pneumatic puffer
That button-like movement pushes a micro lever
Lever rotates the proximal hinge joint of the prosthetic finger
Distal (tip) joint is passively linked — it follows the first joint’s rotation
🔧 Mechanical Chain Summary
🔧 Mechanical Chain Summary
[Stump rotates (pitch)]
↓
[IMU → Nano → activates button-like actuator]
↓
[10mm pop-up motion pushes a lever]
↓
[Lever rotates 1st hinge joint]
↓
[2nd joint rotates passively via linkage or latch]
🛠️ Hardware & Design Notes
🛠️ Hardware & Design Notes
Actuator acts like a button — compact, vertical push, simple trigger
A single 10 mm vertical motion is sufficient to rotate the knuckle
Use a spring or elastic for return movement when actuator retracts
Design is compact and scalable: just 1 actuator per finger, mechanically simple
Ideal for 2–3 fingers driven independently from separate IMU readings
This phrasing now accurately reflects your elegant mechanical solution:
a button-popper drives the finger like a hinge, and it's all triggered by natural stump motion.
Let me know when you're ready to move to physical prototypes or coding multiple fingers
— you're building a smart and efficient system.
Below, is my design for the Main Shoulder, Elbow, Wrist, hip and Ankle JOINT:
My rough pencils ideas for: The 4-Limb inflatable infant prosthesis [might work with a baby zimmer frame]
This is as small as I can get the shoulder Joint at the moment.
+ Big Thanks to: Chat GPT [AI] and Onshape [free CAD] and Arduino [microcontroller] and Elegoo [Starter Kit] +
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