Device for preventing suck-back phenomenon in air-driven dental handpiece

A dental apparatus comprising:

• an air-driven dental handpiece, the air-driven dental handpiece comprises a high-pressure inlet port for high-pressure air intake and a low-pressure inlet port for exhaust air intake;
• and
• a device for preventing suck back phenomenon in the air-driven dental handpiece, the device comprises:
• a high-pressure valve configured to be sealably coupled to the high-pressure inlet port;
• a low-pressure valve configured to be sealably coupled to the low-pressure inlet port;
• an actuating member configured to be operably coupled to the high-pressure valve and configured to push the high-pressure valve against a seat coupled to the high-pressure inlet port closing a first path through the high-pressure inlet port, the actuating member is configured to be retracted by a force of high-pressure air resulting in retraction of the high-pressure valve and opening of the first path,
• wherein, the low-pressure valve is coupled to the high-pressure valve or the actuating member through a push rod, wherein the high-pressure valve moves with the low-pressure valve;
• and
• a compression member that interrupts the low-pressure valve and the push rod, the compression member is configured to cause the low-pressure valve to close first while allowing the high-pressure valve to keep moving further to close the first path with a time delay,
• wherein the time delay is a duration between closing of the low-pressure valve and the high-pressure valve.

A device for preventing suck back phenomenon in an air-driven dental handpiece, the air-driven dental handpiece comprises a high-pressure inlet port for high-pressure air intake and an exhaust air outlet for exhaust air outlet, the device comprises:

• a high-pressure valve configured to be sealably coupled to the high-pressure inlet port;
• a low-pressure valve configured to be sealably coupled to the exhaust air outlet;
• an actuating member configured to be operably coupled to the high-pressure valve and configured to push the high-pressure valve against a seat coupled to the high-pressure inlet port closing a first path through the high-pressure inlet port, the actuating member is configured to be retracted by a force of high-pressure air resulting in retraction of the high-pressure valve and opening of the first path,
• wherein, the low-pressure valve is coupled to the high-pressure valve or the actuating member through a push rod, wherein the high-pressure valve moves with the low-pressure valve;
• and
• a compression member that interrupts the low-pressure valve and the push rod, the compression member is configured to cause the low-pressure valve to close first while allowing the high-pressure valve to keep moving further to close the first path with a time delay,
• wherein the time delay is a duration between closing of the low-pressure valve and the high-pressure valve.