Wonderful CSDH

Shoulder disarticulation leaves no residual upper arm, so the prosthesis has to rebuild the whole limb from the shoulder outward. The CSDH does that in one aluminium frame, and its main work happens in daily life after the fitting: the arm is there whenever the wearer is dressed and out among other people.

Prosthetic and orthotic workshops fitting upper limb patients are the natural home for it. Prosthetists building a passive arm for a shoulder-level amputation can choose the three or five-finger hand to suit the wearer, then lay out the elbow and wrist positions with them during fitting. Rehabilitation centres working with amputees after shoulder-level surgery or trauma can use it where the person's priority is a restored outline and a natural presence when walking, sitting or standing among others.

The free-swinging upper arm shapes where the CSDH earns its place. Someone walking to a shop, waiting at a bus stop or crossing a room at a family gathering keeps an arm that moves with their stride, and a jacket or coat sleeve hangs from a filled shoulder line. Seated at a dinner table or in a meeting, the elbow can be set to a bend so the forearm rests across the lap, and the wrist turns the hand inward to sit quietly.

Limb fitting services that see adults returning to work or social routines will find the light 0.6 kg weight relevant for a full-length arm worn through the day. Charities and community prosthetic programmes fitting cosmetic arms also benefit from a frame with no electrical parts, because it asks nothing of the wearer between fittings beyond setting the joints by hand.

An arm that keeps pace with the body

The upper arm swings freely at the shoulder, so it follows the wearer's walk, turn and posture. The arm moves in rhythm with the person, which is the quality most noticed by others.

A full shoulder line beneath a coat

With the arm in place, sleeves and outer layers hang from a shoulder that has its outline back. A jacket sits evenly on both sides when the wearer is out in public.

Light enough to wear all day

The complete assembly weighs 0.6 kg. For a limb that runs the full length from shoulder to fingertips, that low mass keeps all-day wear comfortable on outings, at work or at home.

Poses that suit the moment

Elbow, wrist and thumb each set by hand, so the wearer can arrange the arm straight for walking, bent across the lap at a table, or with the palm turned in while standing in conversation.

A choice of hand form

Three-finger and five-finger hands are available on the same frame. Fitters can match the hand to what the wearer wants to see at the end of the sleeve.

Nothing to charge

Every motion is passive or hand-set, so the arm is ready the moment the wearer dresses for an evening out. Upkeep between fittings stays mechanical.

Simple handling for the wearer

Moving the thumb controls the hand, and pressing the elbow handle frees the elbow to flex or extend. The adjustments are few and physical, so they are learned quickly.

One frame through the whole limb

Upper arm, elbow, wrist and hand belong to a single aluminium assembly. The fitter works with one structure from the shoulder downward.

Free-swinging upper arm

At the shoulder, the upper arm hangs on a joint that lets it swing freely. Gait and trunk movement carry it forward and back, and it comes to rest at the side when the wearer stops.

Shoulder disarticulation indication

The CSDH is intended for shoulder disarticulation, where amputation has taken place at the shoulder joint itself. Its length covers the full limb.

Aluminium construction

Aluminium forms the structure from the upper arm to the hand. It gives each joint a rigid mounting while keeping the total mass at 0.6 kg.

Total weight of 0.6 kg

At 600 g for the whole arm, the assembly adds little load at the shoulder. That weight includes the upper arm, elbow, forearm, wrist and hand.

Three-finger hand option

One build carries a three-finger hand. It gives a compact hand form at the end of the forearm.

Five-finger hand option

A five-finger hand is the other build. This version completes the outline of a hand with all digits present.

Thumb-controlled hand action

The hand's action is controlled by moving the thumb. A small movement of the thumb sets the hand in a resting pose or a natural drop at the side.

Passive wrist rotation

Turning the wrist by hand changes the direction the palm faces. Facing it inward suits standing and walking, while turning it down suits resting on a table.

Elbow handle release

Pressing the elbow handle frees the elbow joint. While it is pressed, the forearm can be moved into a new position.

Passive elbow flexion and extension

Once released, the elbow extends and flexes passively. The forearm can hang straight beside the leg or be set at a bend across the body.

Passive mechanics throughout

Swing, elbow, wrist and thumb all work without electrical parts. The arm needs no charging and runs on its mechanics alone.

Full-length arm outline

The assembly reaches from the upper arm through the elbow and forearm to the hand. Under clothing, it fills the sleeve along its whole length.

The CSDH suits people with shoulder disarticulation whose main goal is to look and move like themselves when dressed and out among others. Its strongest quality is the free-swinging upper arm: the limb follows the body through walking and turning, so the arm moves with the wearer and never hangs as a fixed shape. Workshops and rehabilitation teams fitting a passive arm at shoulder level will value the choice of three or five fingers, and wearers gain a frame they can pose by hand at the elbow, wrist and thumb with nothing to charge. The whole arm, from the upper arm to the fingertips, weighs 0.6 kg in aluminium.