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Wonderful 4F21-34
Wonderful 4F21-34
Wonderful 4F21-34
Wonderful 4F21-34
Wonderful Orthopaedic, Trauma & Prosthetics

Wonderful 4F21-34

Product Code: OTAP-PLAC-3035

A 34 mm bore, for builds specified on the larger pylon.

Modular limbs are built on one of two pylon diameters, and the larger is chosen where loads are higher. A clamp is bored for one or the other, and the bore has to match the tube the build uses. Listed on Medigear.uk for UK business buyers.

Sections
Prosthetic Components & Adaptors
Categories
Orthopaedic, Trauma & Prosthetics
Condition
New
Origin
China
Seller Type
Certified Professional Seller
CE & ISO Certified
Global Shipping
Supplier: Medigear
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Modular prosthetics settled on two pylon diameters, and the choice between them is a structural one rather than a matter of preference.

The smaller diameter suits the majority of builds and keeps mass down. The larger is specified where loads are higher, and the reason is geometric: for a tube of given wall thickness, resistance to bending rises sharply with diameter, because the material sits further from the neutral axis. A wider tube therefore carries more load without a proportionate increase in weight, which is why heavier users and higher activity levels are commonly built on the larger pylon.

That decision then propagates through the build. The pylon, the clamp that grips it, and any tube adapters above must all be specified to the same diameter. A clamp bored at one size cannot take a tube of the other, and there is no adjustment or adaptor that reconciles them in the way a thread or a pyramid connection can be adapted. Diameter is settled at specification and everything follows from it.

Within that constraint the clamp does what any tube clamp does. A slot through the body closes as the screws are tightened, reducing the bore slightly and gripping the pylon by friction across the contact area. How far the tube enters sets the limb length; how it is turned before tightening sets toe-out or toe-in. Both are established at the bench and can be revisited as a user's alignment needs change during rehabilitation.

Two figures govern whether that joint is sound, and both are published by manufacturers rather than being matters of judgement. Clamp screw torque determines the grip: too little and the pylon can rotate or migrate under load, too much and the clamp or tube can be damaged. Minimum insertion depth determines how much of the tube is held: a pylon short of that depth is gripped over less area than the design intends, on a joint carrying the user's full weight at every step.

Material and finish should be established for this reference, since no material suffix appears in the code and the choice affects both the weight rating and how the fitting behaves in wet or dirty conditions. Build height should be established alongside them, as the clamp occupies space between the components above and below it.

This is a component supplied for fitting within a prosthesis by a qualified prosthetist, who cuts the pylon, sets length and rotation, and tightens the clamp to the specified torque. The manufacturer, bore, material, build height, rating, screw specification, torque and insertion depth are provided by the seller at quotation, with UKCA or CE marking documentation, the declaration of conformity, instructions for use and warranty terms issued by the manufacturer or held by the seller.

Higher load transtibial builds are commonly specified on the larger pylon diameter, which this clamp is bored for.

Heavier users are served by the structural capacity a wider tube provides for a given wall thickness.

Higher activity levels place greater cyclic load on the pylon, which bears on diameter selection at specification.

Limb length is established at this fitting through pylon insertion depth.

Toe-out and toe-in are set by rotating the pylon within the bore before the screws are tightened.

Alignment revisited during rehabilitation depends on a clamped joint that can be loosened and reset.

Clinics holding stock need clamps in both bore diameters, since the two are not interchangeable.

Bored for the Larger Pylon

A 34 mm bore matches builds specified on the wider tube, which is where higher loads are carried.

Structural Capacity From Diameter

A wider tube resists bending considerably better for a given wall thickness, because material sits further from the neutral axis.

Diameter Settled at Specification

Pylon, clamp and tube adapters are specified to one diameter, and establishing it early avoids an unassemblable build.

Length Set at the Bench

How far the pylon enters the bore determines the distance between socket and foot, adjustable afterwards.

Rotation Set Before Tightening

Turning the pylon within the clamp sets toe-out or toe-in, affecting how the foot meets the ground.

Grip Across the Contact Area

Closing the slot reduces the bore and grips the tube by friction over its full contact length.

Adjustment That Can Be Revisited

Alignment changes during rehabilitation are accommodated by loosening, resetting and retightening to torque.

Insertion Depth Established

Minimum pylon engagement is confirmed so the clamp grips over the length the design intends.

Torque Taken From the Instructions

The screw figure comes from this product's documentation rather than from comparable fittings.

Suffix Convention Confirmed

What the reference encodes is established, so the bore ordered is the bore required.

Supply and Documentation Arranged

Medigear.uk can arrange supply, documentation and the provision of consumables.

Tube Clamp Adapter, 34 mm Bore

Joining a pylon to an adapter in a modular lower limb prosthesis.

Item Reference: 4F21-34

To be confirmed against the manufacturer's marking, including the suffix convention.

Relationship to 4F21-AL-3

Confirmed at quotation, establishing whether the two differ by bore, material or both.

Manufacturer

Wonderful Rehabilitation, to be confirmed at quotation.

Bore Diameter: 34 mm

Per the reference suffix, to be confirmed.

Material

Confirmed at quotation, as no material suffix appears in this reference.

Finish

Confirmed at quotation.

Build Height

Confirmed at quotation.

Clamp Slot and Screws

Slot closing onto the tube, with screw size, count and type confirmed at quotation.

Clamp Screw Torque

Confirmed at quotation from the manufacturer's instructions.

Minimum Tube Insertion Depth

Confirmed at quotation.

Proximal Connection

Pyramid, receiver or threaded face, confirmed at quotation.

Maximum Body Weight

Confirmed at quotation.

Product Weight

Confirmed at quotation.

Compatible Pylons and Adapters

Confirmed at quotation, matched to the bore diameter.

UKCA or CE Marking and Declaration of Conformity

Issued by the manufacturer and requested from the seller at quotation.

Instructions for Use

Provided by the seller at quotation, and required before fitting.

Warranty Terms

Set by the seller at quotation.

The 4F21-34 is a tube clamp adapter bored at 34 mm, for modular limbs built on the larger pylon diameter. Modular prosthetics settled on two diameters, and the choice between them is structural: for a tube of given wall thickness, resistance to bending rises sharply with diameter because the material sits further from the neutral axis, so the wider pylon carries more load without a proportionate weight penalty, which is why heavier users and higher activity levels are commonly built on it. That decision then runs through the whole build, since pylon, clamp and any tube adapters must share one diameter and no adaptor reconciles the two. Within that constraint the clamp works as any does, with a slot closing under its screws to grip the tube by friction, insertion depth setting limb length and rotation before tightening setting toe-out or toe-in, both revisable as alignment needs change. Clamp screw torque and minimum insertion depth are the two figures that decide whether the joint is sound, and both come from the manufacturer rather than from judgement. Cutting, setting and tightening are the work of the prescribing prosthetist. Material, build height, rating, torque and insertion depth are provided by the seller at quotation alongside UKCA or CE documentation. Medigear.uk lists the clamp for UK business buyers and can arrange supply, documentation and the provision of consumables. Enquire for a written quotation.

FAQ

Frequently Asked Questions

Everything buyers need to know about sourcing medical equipment through MediGear.

It is a tube clamp adapter with a 34 mm bore, joining a pylon to an adapter in a modular lower limb prosthesis.

Because the larger diameter carries more load for a given wall thickness, since the material sits further from the neutral axis and resistance to bending rises sharply with diameter.

Commonly where loads are higher, covering heavier users and higher activity levels, as a structural decision taken at specification.

No. Bore diameter is not adjustable and there is no adaptor that reconciles the two, so the pylon diameter decides which reference is ordered.

The family suffixes appear to encode material and bore diameter, but the convention should be confirmed from the manufacturer before ordering.

A slot through the body closes as the screws are tightened, reducing the bore and gripping the tube by friction across the contact area.

How far the pylon enters the bore, established at the bench and adjustable afterwards.

How the pylon is turned within the clamp before the screws are tightened, which sets toe-out or toe-in.

Because the clamp grips over a defined length, and a tube short of the specified depth is held over less area than the design intends.

Confirmed at quotation, since no material suffix appears in this reference and the choice affects both rating and behaviour in wet conditions.

A qualified prosthetist, who cuts the pylon, sets length and rotation and tightens to the specified torque.