Sale on Manual & Electric Hospital Beds - Starting from 25 September!

Home
Shop
Orthopaedic, Trauma & Prosthetics
Wonderful 3F25P-1

✓ Certified Professional Seller

Wonderful Orthopaedic, Trauma & Prosthetics

Wonderful 3F25P-1

Product Code: OTAP-PLAC-3848

A four-bar knee with an air cylinder that smooths every swing.

Give a transfemoral limb four-bar stance geometry and air-damped swing from one aluminium knee. It weighs 850 g on the sheet and bends to 135°, and its -1 suffix belongs on every order, tender line and build record it touches.

Sections

Prosthetic Feet & Knees

Categories

Orthopaedic, Trauma & Prosthetics

Condition

New

Origin

China

Seller Type

Certified Professional Seller

CE & ISO Certified

Global Shipping

Supplier: Medigear

The "-1" at the end of Wonderful's 3F25P-1 marks a variant of an aluminium four-bar pneumatic knee joint for transfemoral prostheses. The sheet lists a mass of 850 g, a load weight of 125 kg and a knee flexion range of 135°. Its Chinese name, 四连杆气压膝关节, reads as four-link air-pressure knee joint. An air cylinder governs swing, the manufacturer's listing describes it as an unlocked knee, and it carries no electrical parts.

Traceability is where this code asks the most of a buyer. The printed figures alone do not single the knee out, so the full code must travel intact. It runs from the purchase order or tender line through goods-in to the build record and the statement a workshop writes for a custom-made limb. Spares are matched to it, and any field safety notice would name it. Ask the manufacturer, through the enquiry team, what the "-1" changes, whether finish, cylinder or connection, and file the written answer with the build.

The photograph shows a four-bar head with silver side links, a male pyramid on a polished dome at the top and a black lower body narrowing towards a squared fitting at its base. The cylinder itself is out of sight, and the instructions for use show where its swing resistance is adjusted. Wonderful's listing for this code gives 100 kg and 0.8 kg, so the rating runs from 100 to 125 kg across sources and limbs are planned at 100 kg until the ISO 10328 report settles it.

Build height, distal connection and overall dimensions come from the manufacturer's drawing, 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 3F25P-1 belongs in transfemoral limbs for users at a medium activity level who walk at more than one pace and want a knee that stays unlocked. The four-bar head gives stance security through geometry, and the air cylinder shapes swing, which together suit community walking within the 100 kg planning figure.

Its place in a service depends as much on paperwork as on gait. A limb built for a named patient is a custom-made device, and the workshop that builds it signs the statement identifying the device and its components. With a suffixed code, that statement, the build record and the original tender line must all carry "-1". Should Wonderful ever issue a field safety notice, the service that recorded the exact variant can trace every affected wearer from its own records.

Category evidence on pneumatic swing control is modest and mixed. A randomised crossover trial of 28 adults with unilateral transfemoral amputation compared a knee with pneumatic swing control and one with mechanical swing control. Fast walking speed and gait symmetry improved with the pneumatic knee, while comfortable walking speed showed no significant difference. A 2021 study of five experienced users found that raising swing resistance improved swing-time symmetry but reduced toe clearance, so the setting itself carries a trade-off. Neither study tested this model.

Limb centres, independent prosthetic practices and export programmes are the usual buyers. NHS limb services in England order through a mandated framework, and equivalent public procurement elsewhere asks for the same line-by-line code matching. The conformity documentation those procurement routes require is issued by the manufacturer and shared by the enquiry team.

One code that follows the limb

Carried in full from tender to build record, the 3F25P-1 code lets a service tie each fitted knee to its documents, its spares and any future safety notice.

Swing resistance that tracks pace

Air resists the bend more as steps quicken. A user who speeds up to cross a road gets firmer swing control, within the range set at fitting.

Stance security from geometry

The four-bar head places the centre of rotation where body weight tends to hold the knee straight in early stance, with nothing for the wearer to operate.

Toe clearance in mid-swing

The linkage shortens the shin as the knee bends, which gives the foot extra room over kerbs and uneven paving.

Room to sit and kneel

A 135° flexion range covers chairs, car seats and most kneeling tasks, so the knee rarely limits how a user settles.

Aluminium at 850 g as printed

A light alloy body keeps the limb's swing mass down, with the weighed figure recorded from the quotation.

No release before sitting

Being unlocked, the knee bends whenever the wearer lets it, so sitting down needs no lever or cord.

A written inspection routine

The listing's six-monthly checklist gives a service a ready schedule for review appointments and a clear entry for each visit in the build file.

Nothing electrical to manage

There is no battery, charger or electrical safety test to plan for, which keeps outreach and export fittings simple.

Suffixed order code

The "-1" sits on the sheet as part of the model code. The manufacturer's written description of the variant should be filed with it.

Four-link air-pressure name

四连杆气压膝关节 names the two working principles plainly: a four-link frame and air pressure.

Four-bar linkage

Four pivots join the upper and lower bodies. Their positions, set out on the drawing, decide how the knee behaves at heel strike.

Pneumatic swing cylinder

An air cylinder resists flexion and returns energy towards extension. Its adjustment points are shown in the instructions for use.

Pyramid at the top

In the photograph, a male pyramid rises from a polished dome above a black plate, ready for a socket adapter with a female receiver.

Silver side links

Polished or silver-finished links run down each side of the head. Whether the "-1" relates to this finish is a question for the manufacturer.

Black lower body

A black body extends below the linkage and narrows towards the distal end, where the cylinder is housed out of view.

Distal fitting

A squared fitting closes the lower end in the photograph. The drawing names the connection and the tube it takes.

135° knee flexion

The sheet gives 135° as the flexion range, enough for sitting and most daily transfers.

125 kg sheet rating

The printed load weight is 125 kg. Wonderful's listing for the same code gives 100 kg, which is the planning figure until the test report settles it.

850 g mass

The sheet prints 850 g and the listing 0.8 kg. The quotation carries the figure to record.

Aluminium construction

Aluminium is the only material on the sheet, with no titanium or steel version listed under this code.

Six-monthly inspection

The listing asks for inspection at least every 6 months, covering alignment, screws, lubricant and adapter damage.

One-year warranty on the listing

Wonderful's listing gives one year from delivery. The warranty in force for an order is set out in the quotation.

Unpowered construction

There are no electrical parts, so no electrical safety testing applies.

Manufacturer's quality system

Wonderful's website describes an ISO 13485 quality management system, and the enquiry team can share the certificate and its scope when asked.

The 3F25P-1 suits services fitting medium-activity transfemoral users up to 100 kg who walk at varying speeds and want an unlocked knee with four-bar stance security. It earns its place where records are kept carefully, because its value depends on the "-1" surviving every document from tender to limb. It is the wrong pick for users above the planning figure, users who need a lock and builds that require stance-phase resistance on slopes and stairs. Settle the load rating and ISO 10328 level, what the suffix changes, and the cylinder's service routine before ordering.

Medigear.uk lists the 3F25P-1 for business buyers worldwide and can arrange delivery, installation, commissioning, familiarisation and service cover. Ask the enquiry team for the ISO 10328 test report, the written description of the -1 variant, the drawing and the instructions for use before ordering.

FAQ

Frequently Asked Questions

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

It marks a variant whose differences are not documented. Wonderful can state in writing whether the suffix changes the finish, the cylinder, a connection or something else, and the enquiry team passes that statement on. Keep it with the purchase records, because it decides which spares fit later.

A recall, a field safety notice or a spares order is matched to the exact code. If "-1" drops off a purchase order or a build record, the knee in the limb can no longer be tied to the documents that cover it. Write the full code on the tender line, the goods-in check, the build record and the custom-made device statement.

As the knee bends after toe-off, a piston compresses air inside a cylinder, and that resistance limits how far the heel rises. The compressed air then pushes back, helping the shin swing forward into extension. Faster steps compress the air faster, so resistance rises with walking speed within the range the prosthetist sets.

Four pivots move the knee's centre of rotation as it bends. Early in stance, that centre sits back from the load line, which helps the knee resist buckling, and in mid-swing the shin effectively shortens, adding toe clearance. The drawing sets out the exact geometry for this model.

The manufacturer's listing describes thigh amputees with a medium activity level who want stable stance, moderate swing control and an unlocked knee. That usually means community walkers who change pace during the day, across pavements, shops and public transport. The prosthetist should match the activity grade in the instructions for use to the user.

Anyone above the 100 kg planning figure sits outside it until the test report supports more. It also suits no user who needs a manual lock for safety, and no build that calls for yielding stance resistance on slopes and stairs, since the air cylinder works in swing. Knee disarticulation limbs should follow the levels the instructions for use name.

The sheet prints 125 kg, while Wonderful's listing for the same code gives body weight up to 100 kg and, in its user notes, mentions users under 125 kg. Plan at 100 kg until the ISO 10328 test report states the rating and its loading level. The limb is also capped by its lowest-rated part, so a 125 kg adapter or foot below the knee sets its own ceiling.

The sheet gives 850 g and the listing gives 0.8 kg. A 50 g difference matters little to the wearer but does matter for the build file, so take the weighed figure from the quotation and record it.

Wonderful's listing calls for inspection, with repair where needed, at least every 6 months. Its checklist covers alignment, screw connections, the user's continued suitability, loss of lubricant and damage to the joint or its adapters. Cylinder seal life and service routines are set out in the instructions for use, which the enquiry team shares.

The 3F25P-1 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. A limb built around it for a named patient is a custom-made device, so the building workshop holds the manufacturer duties, including registration with the MHRA and the written statement for each limb.

NHS England mandates the NHS Supply Chain Prosthetic Components and Associated Products framework, running from 24 November 2025 to 23 November 2027 with one lot, Artificial Limbs, as the compliant route for prosthetic products. NHS trusts should start there. Public buyers in other countries apply their own tender rules, which usually ask for the same exact code on each line.