Medico-surgical apparatus
Apparatus ( 20 ) for fitting to the machine end of a tracheostomy tube ( 10 ) includes both an HME and a speaking valve ( 30 ). The HME includes two exchange elements ( 28, 29 ) at opposite ends of a housing ( 23 ) extending laterally of a coupling ( 25 ) for fitting on the tube. The speaking valve has a cylindrical sleeve ( 31 ) extending across the housing midway along its length and in line with the tube. The sleeve is rotatable about its axis and has two openings ( 36 ) on opposite sides that can be aligned with the exchange elements of the HME to allow gas to flow from the tube through the exchange elements, bypassing the speaking valve. When the patient wishes to speak, he twists and rotates the speaking valve to block flow to the exchange elements and instead to allow air to be inhaled via the valve.
1 . Medico-surgical apparatus adapted for fitting with a machine end of a tracheostomy tube, characterised in that the apparatus includes a housing having both a one-way speaking valve and at least one HME element, that the apparatus is arranged such that in one state flow through the at least one HME element is enabled preferentially to flow through the speaking valve and in another state inhalation flow through the speaking valve is enabled preferentially to flow through the at least one HME element, that the speaking valve has a portion arranged to block a passage through the HME element in the other state, that the portion of the speaking valve is a cylindrical sleeve angularly displaceable within the housing, and that the sleeve has an opening that aligns with the at least one HME element in the one state.
2 . The medico-surgical apparatus according to claim 1 , characterised in that the speaking valve is fitted with the housing in a manner that enables the speaking valve to be displaced out of the housing by an excessive expiratory force.
3 . The medico-surgical apparatus according to claim 1 , characterised in that the apparatus has a coupling adapted for fitting with the machine end of the tracheostomy tube, a body portion extending transversely of the coupling, the at least one HME element and an other HME element at opposite ends of the body portion and a cavity aligned with the coupling in which the speaking valve is angularly displaceably received for displacement between the one and other states.
4 . The medico-surgical apparatus according to claim 1 , characterised in that the apparatus includes occlusion means operable separately of the speaking valve to prevent or enable flow through the or each HME element.
5 . The medico-surgical apparatus according to claim 4 , characterised in that the occlusion means is pneumatically operable, and that the apparatus includes a pneumatic actuator.
6 . The medico-surgical apparatus according to claim 4 , characterised in that the occlusion means includes a bellows expansible to block flow through the or each HME element.
7 . The medico-surgical apparatus according to claim 5 , characterised in that the occlusion means includes a bellows expansible to block flow through the or each HME element.
8 . An assembly of a tracheostomy tube and medico-surgical apparatus according to claim 1 , wherein the medico-surgical apparatus is fitted with the machine end of the tracheostomy tube.