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Orthopaedic, Trauma & Prosthetics
Wonderful 3FH-3R78

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Wonderful Orthopaedic, Trauma & Prosthetics

Wonderful 3FH-3R78

Product Code: OTAP-PLAC-4159

A titanium knee with hydraulic control behind every swing.

Fit a titanium knee whose swing is paced by oil, then keep it on its maker's own spares. The 3FH-3R78 prints a 150 kg load weight and a 135° bend, and its code resembles numbering seen elsewhere, so every seal kit and cylinder is matched by exact code.

Sections

Prosthetic Feet & Knees

Categories

Orthopaedic, Trauma & Prosthetics

Condition

New

Origin

China

Seller Type

Certified Professional Seller

CE & ISO Certified

Global Shipping

Supplier: Medigear

Titanium and hydraulic swing control come together in Wonderful's 3FH-3R78, a prosthetic knee joint for transfemoral and knee-disarticulation limbs. Its Chinese name, 液压膝关节, reads as hydraulic knee joint, so neither name describes the axis arrangement. Three figures are printed: a load weight of 150 kg, a knee flexion range of 135° and titanium as the material. A fluid cylinder resists the shin as it swings. The instructions for use set out whether it also acts in stance, which resistances can be adjusted and whether a lock or extension assist is fitted. The knee has no electrical parts.

Safety on this knee starts with its code. 3FH-3R78 resembles part numbering used elsewhere in the prosthetics industry, yet matching digits imply nothing about shared bore sizes, seal profiles, oil grade or cylinder stroke. A seal kit or cylinder bought against a similar number might fit poorly, or fit and then change the damping, so the swing tuned at fitting would drift from the wearer's walking pace. Stance behaviour could alter too. Spares, adapters and servicing therefore follow Wonderful's own parts list and instructions, and goods-in checks that the box label and delivery note both read 3FH-3R78 in full.

The photograph shows a grey, titanium-coloured upper body capped with a red part, slim links running down both sides and a black lower housing bearing a small label, with a grey tube below it. A tag hangs at one side. Standard supply is the knee as the quotation itemises it, with any connector, tool or seal kit named by part number.

Build height, overall length and both end connections are drawn on the manufacturer's dimension sheet, which the enquiry team shares. It is available to buyers in more than 80 countries through Medigear.uk, and the enquiry team sets out stock and lead time.

The 3FH-3R78 is for transfemoral and knee-disarticulation limbs where a prosthetist wants fluid-controlled swing in a titanium knee. Its place in a service depends as much on the spares routine around it as on the joint itself, because a hydraulic knee keeps its tuned swing only while its seals, oil and cylinder stay as the manufacturer specified.

Swing control is the clinical point. As the wearer walks faster, the shin has to swing through quickly yet stop softly at full extension, and a fluid cylinder resists that motion more as the speed rises. Category evidence shows the value of swing control that adapts to cadence. In a crossover trial of 17 adults in Cambodia, a cadence-responsive friction controller produced 0.99 m/s walking speed at normal pace against 0.86 m/s for a constant-friction knee, with cadence of 101 and 92 steps per minute. Neither knee in that trial was hydraulic, and the findings describe knee types, never this model.

That same swing depends on parts matching. Prosthetic workshops often hold spares from many makers, and codes that look alike invite substitution. A safe routine stores the 3FH-3R78's spares under its exact code, sends any unverified item to quarantine at goods-in and records batch details against the wearer's limb file. Servicing follows Wonderful's instructions, with every cylinder or seal change entered in that file.

Limb-fitting centres, rehabilitation hospitals, independent prosthetic clinics and export programmes with controlled stores suit it well. NHS services in England buy through the mandated prosthetics framework, and public purchasers abroad run comparable tenders. The conformity documentation those procurement routes require is issued by the manufacturer and shared by the enquiry team.

Swing paced by fluid

A hydraulic cylinder is there to slow the shin through swing and soften the end of extension. Wearers gain a steadier step, set by the prosthetist to their usual pace.

Titanium in the structure

Titanium keeps the frame light for its strength and stands up to sweat and wet weather. The alloy grade and the parts it forms are named on the material certificate.

A 150 kg load weight

The printed figure reaches heavier wearers and those who carry loads at work. It becomes the limb's rating only when every other structural part matches it.

Room to sit at 135°

A 135° flexion range lets the shin fold well beyond a right angle, so chairs, car seats and kneeling stay within reach.

A spares rule that is easy to audit

One exact code on every label, carton and delivery note gives goods-in a single test to apply. Whatever fails it goes to quarantine and nowhere near a wearer.

Servicing to one set of instructions

Seal changes, oil and cylinder work all follow the manufacturer's own procedure. Technicians across a team then service the knee identically.

Traceable from order to limb file

Code, batch and delivery reference recorded at goods-in follow each part into the wearer's record. An incident report or recall can then reach the right limb quickly.

Nothing to charge or test electrically

With no battery or electronics, the knee needs no charger and no electrical safety testing. ISO 10328 structural evidence anchors its technical file.

Hydraulic knee joint

The sheet names it in English and as 液压膝关节. Whether the cylinder acts in swing alone or in stance as well is set out in the instructions for use.

Swing resistance settings

Any adjustment for flexion or extension resistance sits on the cylinder. Its location and range appear in the manufacturer's fitting instructions.

150 kg load weight

Printed as "Load Weight:150Kg". The manufacturer's ISO 10328 test report gives the loading level and cycle count behind it.

135° knee flexion range

Written on the sheet as 135°. Any flexion stop that limits the bend in a finished limb is shown on the drawing.

Titanium material

"Material: TI" is the only material line, read here as titanium. Which components are titanium is listed on the material certificate.

Mass via the quotation

The quotation states the knee's mass. That figure belongs in the limb's weight budget alongside socket, tube and foot.

Exact model code

Every label and document should carry 3FH-3R78 in full. A missing suffix or changed digit is a reason to stop and query the delivery.

Manufacturer's own spares

Seal kits, cylinders and adapters are matched to this code through Wonderful's parts list. Similar numbering on another part proves nothing about fit.

Grey upper body

In the photograph the upper body is grey with a titanium tone. A red part sits on top of it.

Side links

Slim links run down both sides of the knee in the image. The manufacturer's drawing shows how they connect and where the pivots sit.

Black lower housing

A black housing carrying a small label forms the lower section in the photograph. The label's printing is too small to read in the image.

Lower tube

A grey tube extends below the housing. Its diameter and the type of distal connection come from the drawing.

Hanging tag

A tag hangs at one side of the knee. Treat it as packaging until the quotation lists it as anything else.

Unpowered construction

There is no battery, sensor or charger. Electrical safety testing therefore does not apply to the knee.

Manufacturer's quality statements

Wonderful's website describes an ISO 13485 quality system and CE certification. The model-level declaration for the 3FH-3R78 is issued by the manufacturer and shared by the enquiry team.

Choose the 3FH-3R78 when a service wants fluid swing control in a titanium knee and can run a controlled spares routine around it. It fits workshops that already quarantine unverified stock, record batch details and service each knee to the manufacturer's instructions. It suits wearers who walk at varying speeds and whose finished limb is rated for their weight and load. Look elsewhere if spares will be sourced by resemblance, if the wearer needs a lock or microprocessor stance control, or if any structural component falls below the wearer's needs.

Medigear.uk lists the 3FH-3R78 for business buyers worldwide and can arrange delivery, installation, commissioning, familiarisation and service cover. Ask the enquiry team for the instructions for use, the spare parts list, the ISO 10328 test report, the drawing, the mass and the declaration of conformity before ordering.

FAQ

Frequently Asked Questions

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

In a hydraulic knee, oil forced through small valves inside the cylinder resists the shin as it swings, slowing the bend and cushioning the end of extension. That steadies foot timing, so the toe clears the ground at a consistent point in each step. Which valves a prosthetist can reach, and whether the cylinder also resists bending under load, are described in the manufacturer's instructions for use.

Treat it as unproven until the manufacturer's parts list names it for this exact code. Numbers that resemble one another across the industry carry no promise of matching dimensions, seal materials or oil. The enquiry team shares Wonderful's spare part numbers for the 3FH-3R78 on request.

A seal that does not seat fully can weep oil, and a weakened cylinder lets the shin swing further and faster than the prosthetist set it. A cylinder with a different stroke or valve layout can stiffen the knee instead, or change how it behaves when loaded. Either change alters foot clearance and the timing of each step, which raises the chance of a trip.

Compare the code on the product label, the outer carton and the delivery note, and accept the item only when all three read 3FH-3R78 or the exact spare number Wonderful assigns. Anything that differs by a digit or suffix goes to a quarantine shelf, with a note on the delivery record. The enquiry team can then share the manufacturer's documents for the item that was ordered.

Record the code, any serial or batch number and the delivery reference for each knee and spare. Ask for the manufacturer's declaration of conformity and, where available, a batch certificate, both issued by the manufacturer and shared by the enquiry team. In the UK, a suspected counterfeit or non-compliant medical device can be reported to the MHRA through its published reporting route.

A 2026 cross-sectional study in the Turkish Journal of Physical Medicine and Rehabilitation compared 17 men using microprocessor knees with 17 using non-microprocessor knees, four of which were hydraulic. The microprocessor group walked faster on the amputated side (p = 0.007) and used less energy (p = 0.005). The study describes knee types in general and says nothing about the 3FH-3R78.

It applies to the knee alone. A limb is rated at its lowest-rated structural part, and many tube adapters, pyramids and feet carry 125 kg, which would cap this limb at 125 kg. The ISO 10328 loading level behind the 150 kg figure appears in the manufacturer's test report, which the enquiry team shares.

Its mass is given in the quotation from the enquiry team. Add it to the socket, tube and foot when planning the limb's weight budget, and weigh the finished limb at fitting.

It suits no service that cannot hold the manufacturer's own spares or follow its service instructions, because uncontrolled substitution undermines the swing setting. It is also wrong for anyone whose body weight plus carried load exceeds the finished limb's rating. Wearers who need a manual lock or a microprocessor-controlled stance need a knee specified with those functions.

The 3FH-3R78 is typically Class I under UK MDR 2002, or higher depending on use, as stated on the manufacturer's declaration of conformity, which the enquiry team shares. ISO 10328 governs structural testing of lower-limb prostheses. A limb assembled around it for one named wearer is a custom-made device, and the workshop that builds it carries the manufacturer duties.

In England they order through the Prosthetic Components and Associated Products framework from NHS Supply Chain, the route NHS England mandates for prosthetic products. The framework holds a single Artificial Limbs lot and runs from 24 November 2025 until 23 November 2027. NHS procurement routes require that framework for knees and spares, and equivalent public procurement elsewhere asks the same of its suppliers.