Medical delivery device and drug delivery system

A medical delivery device, comprising:

• a housing comprising a first housing member and a second housing member, the first housing member defining a first storage chamber for storing a liquid dispersion medium therein, the second housing member disposed over the first housing member, the second housing member defining a second storage chamber for storing a dispersed substance therein, the second storage chamber having a delivery port for communicating with an external mechanism;
• and
• a push mechanism connected to the first housing member,
• wherein the medical delivery device has a first operational configuration, a second operational configuration and a third operational configuration, wherein
• in the first operational configuration of the medical delivery device, the first storage chamber is not in communication with the second storage chamber;
• in the second operational configuration of the medical delivery device, the first storage chamber is in communication with the second storage chamber, allowing the liquid dispersion medium to enter the second storage chamber to be mixed with the dispersed substance to produce a dispersion system;
• and
• in the third operational configuration of the medical delivery device, the push mechanism drives the first housing member to move relative to the second housing member, causing the dispersion system in the second storage chamber to flow through the delivery port into the external mechanism;
• wherein the push mechanism comprises a handle, a plunger and a pushrod, the handle connected to the first housing member and protruding out of the second housing member, the plunger disposed in the first housing member, the pushrod passed through the handle and connected to the plunger, wherein the first storage chamber is positioned between the plunger and the second storage chamber;
• the pushrod is configured to be selectively locked to the handle;
• when the pushrod is unlocked from the handle, and when the first storage chamber is brought into communication with the second storage chamber, the pushrod drives the plunger to move, causing the liquid dispersion medium to enter the second storage chamber and be mixed with the dispersed substance to produce the dispersion system;
• and
• when the pushrod is locked to the handle, the pushrod and the handle together drive the first housing member to move, causing the dispersion system in the second storage chamber to flow through the delivery port into the external mechanism;
• a locking mechanism for selectively locking the pushrod to the handle;
• wherein the locking mechanism comprises a locking projection and a locking recess, one of which is provided on the pushrod, and the other is provided on the handle.