Medical pump
First Claim
Patent Images
1. A medical pump, comprising:
- a reservoir having a fluid enclosing portion;
a tubular element, the inside of which is arrangeable in fluid communication with the fluid enclosing portion for allowing fluid to pass into the tubular element;
an inner seal movable inside the tubular element between an advanced and a retracted position, wherein the inner seal is retractable from the advanced position to enable the fluid to be transferred from the fluid enclosing portion into an internal space defined by the tubular element and the retracted inner seal, and wherein the inner seal is advanceable from the retracted position for delivering out of the pump fluid present in said internal space;
wherein said fluid enclosing portion contains a volume of fluid sealed from communication with air and the fluid enclosing portion is adapted to reduce in volume essentially to the same extent as any volume of fluid transferred into said internal space of the tubular element;
wherein said fluid enclosing portion comprises a outer seal which is movable inside the reservoir and which defines a delimitation of the fluid contained in the fluid enclosing portion, the outer seal being arranged to move relative to the tubular element when the inner seal is retracted from said advanced position;
wherein the tubular element is located inside the reservoir, wherein the outer seal extends from an inner surface of the reservoir to an outer surface of the tubular element;
wherein the tubular element is movable between an advanced administering position and a retracted filling position, wherein the outer seal is adapted to move relative to the tubular element when the tubular element is retracted from said administering position;
wherein mutually contacting surfaces of the tubular element and the outer seal provide a frictional force F2 against advancing movement of the tubular element towards its administering position, and wherein mutually contacting surfaces of the outer seal and the reservoir provide a frictional force F3 which is smaller than the frictional force F2, wherein the outer seal is advanced together with the tubular element during advancement of the tubular element towards its administering position; and
wherein the reservoir has an outlet covered by an abutment surface that obstructs a fluid flow from the outlet and into the reservoir.
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Accused Products
Abstract
A medical pump, comprising a reservoir having a fluid enclosing portion and a tubular element, the inside of which is arrangeable in fluid communication with the fluid enclosing portion for allowing fluid to pass into the tubular element. The fluid enclosing portion contains a volume of fluid sealed from communication with air and the fluid enclosing portion is adapted to reduce in volume essentially to the same extent as any volume of fluid transferred into the inside of the tubular element. The invention also relates to a method of delivering a medical fluid.
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Citations
22 Claims
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1. A medical pump, comprising:
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a reservoir having a fluid enclosing portion; a tubular element, the inside of which is arrangeable in fluid communication with the fluid enclosing portion for allowing fluid to pass into the tubular element; an inner seal movable inside the tubular element between an advanced and a retracted position, wherein the inner seal is retractable from the advanced position to enable the fluid to be transferred from the fluid enclosing portion into an internal space defined by the tubular element and the retracted inner seal, and wherein the inner seal is advanceable from the retracted position for delivering out of the pump fluid present in said internal space; wherein said fluid enclosing portion contains a volume of fluid sealed from communication with air and the fluid enclosing portion is adapted to reduce in volume essentially to the same extent as any volume of fluid transferred into said internal space of the tubular element; wherein said fluid enclosing portion comprises a outer seal which is movable inside the reservoir and which defines a delimitation of the fluid contained in the fluid enclosing portion, the outer seal being arranged to move relative to the tubular element when the inner seal is retracted from said advanced position; wherein the tubular element is located inside the reservoir, wherein the outer seal extends from an inner surface of the reservoir to an outer surface of the tubular element; wherein the tubular element is movable between an advanced administering position and a retracted filling position, wherein the outer seal is adapted to move relative to the tubular element when the tubular element is retracted from said administering position; wherein mutually contacting surfaces of the tubular element and the outer seal provide a frictional force F2 against advancing movement of the tubular element towards its administering position, and wherein mutually contacting surfaces of the outer seal and the reservoir provide a frictional force F3 which is smaller than the frictional force F2, wherein the outer seal is advanced together with the tubular element during advancement of the tubular element towards its administering position; and wherein the reservoir has an outlet covered by an abutment surface that obstructs a fluid flow from the outlet and into the reservoir. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of delivering a medical fluid, comprising:
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providing a medical pump comprising a reservoir having a fluid enclosing portion and a tubular element, the inside of which is arrangeable in fluid communication with the fluid enclosing portion; providing the fluid enclosing portion with an outer seal which is movable inside the reservoir and which defines a delimitation of the fluid contained in the fluid enclosing portion to prevent the fluid from mixing with air; reducing the volume of the fluid enclosing portion and moving the outer seal relative to the tubular element by transferring a portion of said fluid from the fluid enclosing portion into an internal space of the tubular element, wherein the volume of the fluid enclosing portion is reduced with essentially the same volume as the volume of fluid transferred into the internal space of the tubular element; delivering out from the pump the transferred fluid contained in the internal space of the tubular element; moving the outer seal relatively to the tubular element by moving the tubular element from an advanced administering position towards a retracted filling position; retaining the position of the outer seal relatively to the reservoir when the tubular element is moved from the advanced administering position towards the retracted filling position; advancing the outer seal together with the retracted tubular element by moving the retracted tubular element towards the advanced administering position; and covering an outlet of the reservoir with an abutment surface that obstructs a fluid flow from the outlet and into the reservoir. - View Dependent Claims (14, 15, 16, 17)
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18. A medical pump, comprising:
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a reservoir having a fluid enclosing portion; a tubular element, the inside of which is arrangeable in fluid communication with the fluid enclosing portion for allowing fluid to pass into the tubular element; an inner seal movable inside the tubular element between an advanced and a retracted position, wherein the inner seal is retractable from the advanced position to enable the fluid to be transferred from the fluid enclosing portion into an internal space defined by the tubular element and the retracted inner seal, and wherein the inner seal is advanceable from the retracted position for delivering out of the pump fluid present in said internal space; wherein said fluid enclosing portion contains a volume of fluid sealed from communication with air and the fluid enclosing portion is adapted to reduce in volume essentially to the same extent as any volume of fluid transferred into said internal space of the tubular element; wherein said fluid enclosing portion comprises a outer seal which is movable inside the reservoir and which defines a delimitation of the fluid contained in the fluid enclosing portion, the outer seal being arranged to move relative to the tubular element when the inner seal is retracted from said advanced position; wherein the tubular element is located inside the reservoir, wherein the outer seal extends from an inner surface of the reservoir to an outer surface of the tubular element; wherein the tubular element is movable between an advanced administering position and a retracted filling position, wherein the outer seal is adapted to move relative to the tubular element when the tubular element is retracted from said administering position; wherein mutually contacting surfaces of the outer seal and the reservoir provide a frictional force F3, and wherein mutually contacting surfaces of the tubular element and the outer seal provide a frictional force F4 against retracting movement of the tubular element towards its filling position, the frictional force F3 being larger than the frictional force F4; and wherein the reservoir has an outlet covered by an abutment surface that obstructs a fluid flow from the outlet and into the reservoir.
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19. A medical pump, comprising:
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a reservoir having a fluid enclosing portion; a tubular element, the inside of which is arrangeable in fluid communication with the fluid enclosing portion for allowing fluid to pass into the tubular element; an inner seal movable inside the tubular element between an advanced and a retracted position, wherein the inner seal is retractable from the advanced position to enable the fluid to be transferred from the fluid enclosing portion into an internal space defined by the tubular element and the retracted inner seal, and wherein the inner seal is advanceable from the retracted position for delivering out of the pump fluid present in said internal space; wherein said fluid enclosing portion contains a volume of fluid sealed from communication with air and the fluid enclosing portion is adapted to reduce in volume essentially to the same extent as any volume of fluid transferred into said internal space of the tubular element; wherein said fluid enclosing portion comprises a outer seal which is movable inside the reservoir and which defines a delimitation of the fluid contained in the fluid enclosing portion, the outer seal being arranged to move relative to the tubular element when the inner seal is retracted from said advanced position; wherein the tubular element is located inside the reservoir, wherein the outer seal extends from an inner surface of the reservoir to an outer surface of the tubular element; wherein the tubular element is movable between an advanced administering position and a retracted filling position, wherein the outer seal is adapted to move relative to the tubular element when the tubular element is retracted from said administering position; wherein mutually contacting surfaces of the inner seal and the tubular element provide a frictional force F1; wherein mutually contacting surfaces of the tubular element and the outer seal provide a frictional force F2 against advancing movement of the tubular element towards its administering position; wherein mutually contacting surfaces of the outer seal and the reservoir provide a frictional force F3; wherein mutually contacting surfaces of the tubular element and the outer seal provide a frictional force F4 against retracting movement of the tubular element towards its filling position; wherein said frictional forces satisfy the relationship F1>
F2>
F3>
F4; andwherein the reservoir has an outlet covered by an abutment surface that obstructs a fluid flow from the outlet and into the reservoir.
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20. A method of delivering a medical fluid, comprising:
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providing a medical pump including a reservoir having a fluid enclosing portion, and a tubular element that is moveable relative to the reservoir between an administering position and a filling position; providing the fluid enclosing portion with an outer seal which is movable inside the reservoir and which defines a delimitation of the fluid contained in the fluid enclosing portion to prevent the fluid from mixing with air; providing an inner seal inside the tubular element for movement between an advanced position and a retracted position, wherein the inner seal is retractable from the advanced position to enable the fluid to be transferred from the fluid enclosing portion into an internal space defined by the tubular element and the retracted inner seal; reducing the volume of the fluid enclosing portion and moving the outer seal relative to the tubular element by transferring a portion of said fluid from the fluid enclosing portion into the internal space of the tubular element, wherein the volume of the fluid enclosing portion is reduced with essentially the same volume as the volume of fluid transferred into the internal space of the tubular element; covering an outlet of the reservoir with an abutment surface that obstructs a fluid flow from the outlet and into the reservoir; delivering out from the pump the transferred fluid contained in the internal space of the tubular element; and wherein mutually contacting surfaces of the tubular element and the outer seal provide a frictional force F2 against advancing movement of the tubular element towards its administering position, and wherein mutually contacting surfaces of the outer seal and the reservoir provide a frictional force F3 which is smaller than the frictional force F2, wherein the outer seal is advanced together with the tubular element during advancement of the tubular element towards its administering position.
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21. A method of delivering a medical fluid, comprising:
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providing a medical pump including a reservoir having a fluid enclosing portion, and a tubular element that is moveable relative to the reservoir between an administering position and a filling position; providing the fluid enclosing portion with an outer seal which is movable inside the reservoir and which defines a delimitation of the fluid contained in the fluid enclosing portion to prevent the fluid from mixing with air; providing an inner seal inside the tubular element for movement between an advanced position and a retracted position, wherein the inner seal is retractable from the advanced position to enable the fluid to be transferred from the fluid enclosing portion into an internal space defined by the tubular element and the retracted inner seal; reducing the volume of the fluid enclosing portion and moving the outer seal relative to the tubular element by transferring a portion of said fluid from the fluid enclosing portion into the internal space of the tubular element, wherein the volume of the fluid enclosing portion is reduced with essentially the same volume as the volume of fluid transferred into the internal space of the tubular element; covering an outlet of the reservoir with an abutment surface that obstructs a fluid flow from the outlet and into the reservoir; delivering out from the pump the transferred fluid contained in the internal space of the tubular element; and wherein mutually contacting surfaces of the outer seal and the reservoir provide a frictional force F3, and wherein mutually contacting surfaces of the tubular element and the outer seal provide a frictional force F4 against retracting movement of the tubular element towards its filling position, the frictional force F3 being larger than the frictional force F4.
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22. A method of delivering a medical fluid, comprising:
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providing a medical pump including a reservoir having a fluid enclosing portion, and a tubular element that is moveable relative to the reservoir between an administering position and a filling position; providing the fluid enclosing portion with an outer seal which is movable inside the reservoir and which defines a delimitation of the fluid contained in the fluid enclosing portion to prevent the fluid from mixing with air; providing an inner seal inside the tubular element for movement between an advanced position and a retracted position, wherein the inner seal is retractable from the advanced position to enable the fluid to be transferred from the fluid enclosing portion into an internal space defined by the tubular element and the retracted inner seal; reducing the volume of the fluid enclosing portion and moving the outer seal relative to the tubular element by transferring a portion of said fluid from the fluid enclosing portion into the internal space of the tubular element, wherein the volume of the fluid enclosing portion is reduced with essentially the same volume as the volume of fluid transferred into the internal space of the tubular element; covering an outlet of the reservoir with an abutment surface that obstructs a fluid flow from the outlet and into the reservoir; delivering out from the pump the transferred fluid contained in the internal space of the tubular element; and wherein mutually contacting surfaces of the inner seal and the tubular element provide a frictional force F1; wherein mutually contacting surfaces of the tubular element and the outer seal provide a frictional force F2 against advancing movement of the tubular element towards its administering position; wherein mutually contacting surfaces of the outer seal and the reservoir provide a frictional force F3; wherein mutually contacting surfaces of the tubular element and the outer seal provide a frictional force F4 against retracting movement of the tubular element towards its filling position; and wherein said frictional forces satisfy the relationship F1>
F2>
F3>
F4.
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Specification