Prosthetic Geometric Lock Pneumatic Knee Joint with Pyramid Adaptor
The Model No. (K15AL) Prosthetic Geometric Lock Pneumatic Knee Joint is a mechanical knee component designed for transfemoral (above-knee) prosthetic systems. The knee joint integrates a polycentric geometric locking mechanism with a pneumatic swing control system to provide stability during the stance phase and smooth motion during the swing phase.
This design improves user safety, gait stability, and walking efficiency, allowing amputees to achieve a more natural walking pattern. The knee joint is commonly used for moderate-activity prosthetic users (K1–K2 mobility levels) in daily walking and rehabilitation.
The knee joint consists of the following main components:
Geometric Lock Mechanism
The knee utilizes a polycentric linkage system (four-bar or five-bar mechanism) that creates a geometric locking effect when the prosthesis is loaded.
During the stance phase, the linkage structure stabilizes the knee and prevents unintended flexion, enhancing safety and balance.
Pneumatic Control System
The internal pneumatic cylinder provides air-based resistance to control knee flexion and extension during the swing phase.
This system regulates the swing speed and allows smoother and more natural leg movement.
Polycentric Linkage System
The multi-axis linkage design simulates the biomechanics of the human knee joint.
It shortens the effective limb length during swing phase, improving toe clearance and reducing the risk of tripping.
Stance Phase
When the prosthetic foot contacts the ground and bears weight, the geometric linkage system automatically creates a locking effect, stabilizing the knee joint and preventing accidental buckling.
Swing Phase
When the prosthetic leg leaves the ground, the locking effect is released.
The pneumatic control system regulates the knee's flexion and extension speed to provide smooth and controlled swing motion.
| Product Number |
Material |
Specification |
Part Weight |
Max. Load |
| K15AL—P |
Aluminum |
Pyramidal |
900g |
100Kg / 220Lbs |
Q: Are you a manufacturer or a trading company?
A: We are the manufacturer, providing OEM & ODM service.
Q: How many years since your company start this business?
A: We began manufacturing prosthetics and orthotics parts since the year 2002.
Q: Did your factory Register for export and import?
A: Yes. We applied full range of documents for exportation and importation.
Q: Did your factory and products approved by any testing or certification?
A: yes. We applied CE and ISO13485 medical certification.
Q: May I apply to be one distributor or sole agent in our country to sell your products?
A: yes. This issue can be have a discussion.
Q: May I apply some free samples for testing before purchasing the full range of production?
A: Yes. sample order is acceptable. Also free sample order totally amount can’t be over USD 50.
Q: How to deal for sample order and regular order?
A:Regaring the sample order only can be arranged by fast express, such as DHL UPS TNT and so on, the charges we can check for u! For the regular order, normally we choose BY AIR or BY SEA, EXW, FOB all are acceptable.
Q: How faster u can ship out the order?
A: For sample order normally within 3 days, regual order need to negotiate before every delivery issue settle down.
Q: Which way are acceptable for the payment?
A: TT/ Paypal / Western Union
Q: Can you provide us the best price?
A: Yes, each Item have differential pricing according to quantity.
Q:What’s your Quality warranty?
A:Regarding the the metal parts all for 2 years, For silicone is 0.5-1 year.
Q: Can we visit your factory?
A: Yes, You are welcome to have a visit, u need to make an appointment with us before your coming.
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