Laryngoscope insertion section structure
Disclosed is a laryngoscope insertion section having a curved superior surface and a curved inferior surface, and a channel extending from the proximal end the channel having an inferior internal surface with a greater curvature than the curvature of the inferior surface. The insertion section is compatible with laryngoscope hardware optimised for indirect viewing, yet enables direct viewing. Additionally, the distance between the inferior and superior surfaces is at a maximum within the intermediate portion, and enables the dimensions of the proximal and distal portions to be minimized. Thus, the intermediate portion, which is located in the patient's oral cavity in use, is provided with greatest depth and therefore strength where the greatest forces are received, whereas the distal and proximal portions are of reduced dimensions to as to minimize trauma to the patient's airway and mouth areas, respectively, in use. Further structural features providing the insertion section with improved strength, with a minimum of material and size, are also disclosed.
1. A laryngoscope blade, comprising:
a curved superior surface;
a curved inferior surface configured to face a patient's tongue when the laryngoscope blade is inserted in a patient for use;
a channel extending through at least part of a length of the laryngoscope blade and terminating in a closed end face, wherein the channel comprises an inferior internal surface, and wherein a thickness of a channel wall adjacent the curved superior surface is less than a distance between the inferior internal surface of the channel and an outer edge of the curved inferior surface along at least a portion of the channel; and
an aperture positioned between the inferior internal surface of the channel and the outer edge of the curved inferior surface in a region of the laryngoscope blade along the curved inferior surface forming a buttress, wherein the aperture extends completely through the region forming the buttress.
2. The laryngoscope blade of claim 1 , wherein the curved superior surface and the curved inferior surface each have a substantially constant curvature at an intermediate portion of the blade, and wherein a radius of curvature of the curved superior surface is less than a radius of curvature of the curved inferior surface.
3. The laryngoscope blade of claim 2 , wherein the radius of curvature of the curved superior surface is the same in the intermediate portion and a proximal portion of the laryngoscope blade, such that the curved superior surface of the proximal and intermediate portions form an arc of a circle.
4. The laryngoscope blade of claim 2 , wherein the radius of curvature of the curved inferior surface is between 40 mm and 220 mm at the intermediate portion.
5. The laryngoscope blade of claim 1 , wherein a center of curvature of the curved inferior surface is closer to a center line of the laryngoscope blade than a center of curvature of the curved superior surface.
6. The laryngoscope blade of claim 1 , wherein a distance between the laryngoscope blade and a center of curvature of the curved inferior surface is greater than a distance between the laryngoscope blade and a center of curvature of the curved superior surface.
7. The laryngoscope blade of claim 1 , wherein a center of curvature of the curved superior surface and a center of curvature of the curved inferior surface are at least 15 mm apart.
8. The laryngoscope blade of claim 1 , wherein the channel is curved to follow the curved superior surface.
9. The laryngoscope blade of claim 1 , wherein the channel has a constant cross section along at least a part of its length.
10. The laryngoscope blade of claim 1 , wherein the closed end face is proximal to a distal end of the laryngoscope blade.
11. The laryngoscope blade of claim 1 , wherein the distance is at least 2 mm along at least a portion of the channel.
12. The laryngoscope blade of claim 1 , wherein the region forming the buttress extends laterally from the channel.