Cuffed medical tubes
A cuffed silicone tracheostomy tube has two tapered recesses ( 17 ) and ( 18 ) on its outer surface in which opposite ends ( 7 ) and ( 8 ) of a resilient cuff 6 are bonded using an adhesive or solvent. Two shallow ribs ( 22 ) and ( 23 ) extend around the tube on the inner edge of each recess ( 17 ) and ( 18 ), projecting outwardly to prevent the adhesive or solvent spreading onto the inflatable portion ( 10 ) of the cuff ( 6 ). The cuff ( 6 ) has several shallow ribs ( 9 ) extending around the cuff and spaced along its inflatable portion ( 10 ) to promote even inflation.
1. A cuffed medical tube having a tubular shaft and an inflatable sealing cuff extending coaxially along a part of the shaft, the opposite ends of the cuff being attached with the shaft by an adhesive or solvent in respective annular attachment regions of the shaft, the shaft having a constant outer diameter except at the attachment regions, characterized in that each attachment region has a raised annular rib projecting above the surface of the shaft at inner ends of the respective regions to restrict flow of adhesive or solvent beyond the attachment regions and onto the inflatable portion of the cuff, wherein the raised rib has a diameter larger than the outer diameter of the shaft.
2. A cuffed medical tube according to claim 1 , wherein at least the attachment region towards a patient end of the shaft includes a recess in which an end of the cuff is attached.
3. A cuffed medical tube according to claim 2 , characterized in that both attachment regions include a recess in which a respective end of the cuff is attached.
4. A cuffed medical tube according to claim 2 , characterized in that the or each recess slopes to provide a frusto-conical surface that is deeper towards the or each end of the cuff.
5. A cuffed medical tube according to claim 3 , characterized in that both recesses slope to provide frusto-conical surfaces, and that the recesses incline in opposite senses.
6. A cuffed medical tube according to claim 2 , characterized in that the depth of the or each recess at one end is substantially the same as the thickness of the cuff such that there is a substantially stepless transition between the surface of the shaft and the surface of the cuff.
7. A cuffed medical tube according to claim 1 , characterized in that the cuff is of a resilient material and is arranged so that its inflatable portion closely embraces the shaft when deflated.
8. A cuffed medical tube according to claim 1 , characterized in that the cuff and shaft are of a silicone material.
9. A cuffed medical tube according to claim 1 , characterized in that the cuff has a plurality shallow annular ribs on its inner surface spaced from one another along the inflatable portion.
10. A method of manufacture of a cuffed medical tube including the steps of providing a tubular shaft having two annular attachment regions spaced from one another along the shaft and bounded by respective annular ribs projecting above the surface of the shaft at the ends of the regions closer to one another, providing an inflatable sealing cuff that is a close fit on the shaft at least at opposite ends of the cuff, applying an adhesive or solvent to the attachment regions, and applying the cuff to the shaft such that opposite ends of the cuff locate on the attachment regions and are bonded thereto by the adhesive or solvent to leave an inflatable region of the cuff between the bonded ends, wherein the shaft has a constant outer diameter except at the attachment regions and the respective ribs each have a diameter that is larger than the outer diameter of the shaft.