| 摘要 |
The present invention relates to a delivery tube array which is used to connect a patient to a lung ventilator. A problem arising in the use of such ventilators is that exhaled air cannot be exhausted directly to the atmosphere since a normal outlet valve would also serve to exhaust air delivered on the compression stroke of the ventilator. The invention overcomes this problem by the introduction into a delivery tube array of a relief valve 14, a non-return valve 12 and a bleed-pipe 17 which connects the relief valve to a point up-stream of the non-return valve. Such an arrangement ensures that the relief valve opens only when the pressure within the patient's lungs is greater than the pressure upstream of the non-return valve. <IMAGE> |
