High pressure pumping cartridges for medical and surgical pumping and infusion applications
First Claim
1. A pumping cartridge comprising:
- a cylinder; and
a piston rod constructed and arranged for reciprocating motion with respect to the cylinder, the pumping cartridge including therein a sealing component shaped to include a circumferential, flared sealing flange portion extending away from a portion to which it is attached, of a sealing component support element, such that a first surface of the flared sealing flange portion adjacent to and facing a surface with which it is in sliding contact forms a first angle with respect to the longitudinal axis of the cylinder and a second surface of the flared sealing flange portion facing away from the surface with which it is in sliding contact forms a second angle with respect to the longitudinal axis of the cylinder, where the first angle exceeds 0 degrees, the second angle does not exceed 90 degrees, the second angle exceeds the first angle, andthe sealing flange portion of the sealing component is constructed of a non-elastomeric material, the flared sealing portion is essentially irreversibly deformed during sliding motion of the piston rod relative to the cylinder.
3 Assignments
0 Petitions
Accused Products
Abstract
Pumping cartridges useful for medical and surgical pumping and infusion procedures. In one aspect, a series of pumping cartridges include cylinders and pistons which have a sealing component including a circumferential, flared sealing flange and can be configured to enable the pumping cartridge to generate high liquid pumping pressures. Many of the pumping cartridges can be configured to be detachable from a pump drive unit and disposable after a single use. Some pistons include or at least partially form a valve and/or are relatively movable with respect to a connected piston rod. Valves include a valve seat and a movable sealing element able to create a seal capable of withstanding differences in fluid pressures thereacross of at least about 1,000 psi. The movable sealing element is concave in shape, and may be curved for improved sealing performance. Methods for pumping or infusing a liquid for delivery to the body of a patient or a surgical or medical instrument.
279 Citations
23 Claims
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1. A pumping cartridge comprising:
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a cylinder; and
a piston rod constructed and arranged for reciprocating motion with respect to the cylinder, the pumping cartridge including therein a sealing component shaped to include a circumferential, flared sealing flange portion extending away from a portion to which it is attached, of a sealing component support element, such that a first surface of the flared sealing flange portion adjacent to and facing a surface with which it is in sliding contact forms a first angle with respect to the longitudinal axis of the cylinder and a second surface of the flared sealing flange portion facing away from the surface with which it is in sliding contact forms a second angle with respect to the longitudinal axis of the cylinder, where the first angle exceeds 0 degrees, the second angle does not exceed 90 degrees, the second angle exceeds the first angle, andthe sealing flange portion of the sealing component is constructed of a non-elastomeric material, the flared sealing portion is essentially irreversibly deformed during sliding motion of the piston rod relative to the cylinder. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification