Dynamic seal for use in a dental handpiece

A dynamic seal for use in a dental handpiece, comprising:

• a seal carrier including a first portion having a pair of first features for each receiving a first compliant member, and a second portion having a pair of second features for each receiving a second compliant member, the seal carrier including an unobstructed passage extending between the first portion and the second portion upon installation of the seal carrier in the dental handpiece;
• and
• a flange disposed between the first feature and the second feature;
• wherein the seal carrier has a low friction high integrity surface free of defects, and is sufficiently compliant to absorb side loads and maintain a seal during rotation such that fluid leakage is prevented;
• wherein in response to assembly of the seal carrier in the dental handpiece, with a first component surface of a first component of the dental handpiece in contact with each first compliant member, and a second component surface of a second component of the dental handpiece in contact with each second compliant member,
• during rotational movement of the first component relative to the second component, at least one first compliant member of a pair of first compliant members rotates relative to a corresponding first feature of the seal carrier, at least one second compliant member of a pair of second compliant members rotates relative to a corresponding second feature of the seal carrier, or both the at least one first compliant member of the pair of first compliant members rotate relative to the corresponding first feature of the seal carrier and the at least one second compliant member of the pair of second compliant members rotates relative to the corresponding second feature of the seal carrier,
• wherein the dynamic seal has a diameter that is ⅓ or less in length in comparison to a diameter of an outer sheath of the dental handpiece.

An assembly comprising:

• a barrel of a dental handpiece;
• and
• a seal carrier connected to a first component of the dental handpiece at a first end of the seal carrier, the seal carrier connected to the barrel of the dental handpiece at a second end of the seal carrier, the seal carrier including a first portion at the first end having a first feature for receiving a first compliant member and a second portion at the second end having a second feature for receiving a second compliant member, and a flange disposed between the first feature and the second feature, the seal carrier including an unobstructed passage extending between the first portion and the second portion upon installation of the seal carrier in the dental handpiece;
• wherein the seal carrier has a low friction high integrity surface free of defects, and is sufficiently compliant to absorb side loads and maintain a seal during rotation such that fluid leakage is prevented;
• wherein upon connection of the seal carrier to the first component and the barrel, with a first surface of the first component in contact with the first compliant member, and a surface of the barrel in contact with the second compliant member, during a rotational movement of the barrel relative to the first component, the first compliant member rotates relative to the first feature of the seal carder, the second compliant member rotates relative to the second feature of the seal carrier, or both the first compliant member rotate relative to the first feature of the seal carrier and the second compliant member rotates relative to the second feature of the seal carrier,
• wherein the dynamic seal has a diameter that is ⅓ or less in length in comparison to a diameter of an outer sheath of the dental handpiece.