The invention belongs to the technical field of
medical instruments, and provides a double-cavity
knee joint injection device and method, the double-cavity
knee joint injection device comprises a needle cylinder body, the needle cylinder body is provided with a main
piston cylinder and at least one auxiliary
piston cylinder, the inner cavity of the main
piston cylinder and the inner cavity of the auxiliary
piston cylinder communicate with each other, and the main
piston cylinder and the auxiliary
piston cylinder are movably connected with plungers; the needle cylinder body is further provided with a needle head end, an injection needle head is arranged at the needle head end, the main piston cylinder is in one-way communication with the injection needle head through a one-way valve, the one-way valve is in one-way communication towards the direction of the injection needle head, and the communication pressure of the one-way valve is adjustable. When an injection needle is inserted into non-target injection tissue, such as
muscle, of a patient, the injection resistance of the
muscle tissue is large, a one-way valve cannot be conducted in the injection process, so that injection liquid flows into an auxiliary piston cylinder, and a
plunger retreats. Therefore,
medical staff can conveniently judge whether the injection needle is inserted into a target position or not. And the injection is prevented from being mistakenly injected into other tissues to be wasted.