Wonderful CCMH

Limb-fitting centres and prosthetic and orthotic clinics are the main settings for the CCMH, because its job is to complete a below-elbow arm at whatever residual length the wearer presents with. Wonderful names four levels: wrist disarticulation and short, middle and long forearm residual limbs. A prosthetist building arms across that range can specify one terminal device and one cable action for every case, which keeps fitting, adjustment and wearer instruction on a single pattern.

Rehabilitation and occupational therapy departments use the hand during use training, the stage at which a new wearer learns to open the fingers with a cable pull and let the spring close them on an object. Training tasks follow the uses Wonderful lists: lifting, holding, eating with a spoon, writing with a pen and simple daily activities such as cycling. The resting pinch of thumb, index finger and middle finger gives therapists a ready grip shape for small items from the first session.

Wearers with a wrist disarticulation have a long residual limb and those with a short forearm have much less, yet both sit within the hand's stated range. The passive wrist joint lets each of them turn the hand to the angle a task needs before the grip opens, whether that is a spoon held level at the table or a pen angled to the page. A choice of three or five fingers lets the clinic match the build to the wearer's preference and the grip shape their daily tasks call for.

Services that review wearers over time also benefit from the mechanical design. The cable, spring and finger linkage are the parts to inspect, so upkeep fits into routine prosthetic reviews in clinics, outreach sessions and community limb services.

One terminal device across four forearm levels

Wrist disarticulation and short, middle and long forearm residual limbs all fall inside the designated range. A service that fits several below-elbow levels in one week can build each arm around the same hand.

A single control method to teach

Every wearer learns the same action: pull the cable to open, release it to let the spring close. Therapists repeat one lesson across the whole forearm population, so training material and practice tasks carry from one wearer to the next.

Grip held by the spring

Once the fingers close on an object, the torsion spring keeps them there while the cable is slack. Carrying a pen or a spoon through a task asks little continuous effort from the wearer.

A pinch ready at rest

Thumb, index finger and middle finger meet in a functional position when the hand is idle. Small objects can be presented straight into that pinch, which suits early training sessions.

Wrist set to the task

Passive rotation lets the hand be turned before the grip opens. A wearer with a long limb or a short one can line the fingers up with a page, a plate or a handlebar.

Light aluminium build

The manufacturer gives the mass as 200 g to 260 g, which adds little weight at the far end of the arm.

Finger count to suit the wearer

Three-finger and five-finger builds are both made. The clinic chooses the form that matches each wearer's tasks and preference.

Mechanical upkeep only

The moving parts are the cable, the spring and the finger linkage. Reviews deal with mechanical wear alone, so a routine prosthetic appointment covers the whole hand.

Cable-opened fingers

The traction cable is the hand's single input. A pull on it opens the fingers so an object can be brought between them.

Torsion spring closing

Closing is handled by a torsion spring. As soon as cable tension eases, the spring draws the fingers back together on the object or into the resting pinch.

Functional resting position

Thumb, index finger and middle finger come together at rest. The grip shape is ready for a pen or the handle of a spoon before any cable movement.

Three-finger build

The CCMH can be made with three fingers, concentrating the hand on the thumb, index and middle finger pinch.

Five-finger build

A five-finger version is also made, giving the hand a full set of digits around the same cable and spring action.

Passive wrist rotation

The wrist joint rotates passively. Its position is set by turning the hand, and the grip then works from that angle.

Aluminium frame

The hand frame is aluminium. Wonderful gives its mass as 200 g to 260 g for the terminal device alone.

Champagne finish

The aluminium frame carries a champagne colour, the finish named by the manufacturer for this model.

Wrist disarticulation fit

A wrist disarticulation leaves the longest below-elbow limb, and the CCMH is designated for that level by name.

Long and middle forearm fit

Long and middle forearm residual limbs sit within the designated range, so the same hand serves the central part of the below-elbow population.

Short forearm fit

Short forearm residual limbs are included as well. A wearer with little forearm length still receives the same cable-opened hand.

Simple mechanism

The design keeps the moving parts to the cable, the spring and the finger linkage. With so few parts in motion, the action is easy to explain and straightforward to inspect.

Trained daily uses

After use training, the hand assists with lifting, holding, eating with a spoon, writing with a pen and simple daily activities such as cycling.

The CCMH suits a limb service that fits below-elbow arms at many lengths and wants one hand for all of them. Its designated range runs from wrist disarticulation through long, middle and short forearm residual limbs, and every wearer in that group learns the same cable-to-open, spring-to-close action. That consistency is its strongest case: one terminal device to specify, one control lesson to teach, and one mechanical review routine for the cable, spring and linkage. The choice of three or five fingers and the passive wrist let each build follow the wearer's own tasks. For clinics that want a light, cable-operated hand across the whole forearm population, it is a clear fit, built in aluminium at 200 g to 260 g.