Simple respirator

The utility model discloses a medical instrument, and particularly relates to a simple respirator. The simple respirator adopts the technical scheme that a face mask is connected with the front end of a cylinder body, an oxygen bag is connected with the rear end of the cylinder body, a rodless piston is arranged inside the cylinder body, a non-return valve is arranged on the rodless piston, the rodless piston is made of stainless steel, a magnet sleeve is arranged on the outer wall of the cylinder body, and the rodless piston can be driven to traverse through the sliding of the magnet sleeve to finish the operation of oxygen feeding. The simple respirator provided by the utility model has the advantages that the tidal volume and the oxygen feeding tempo are easy to control, and the operation is simple, so as to bring convenience to medical work.