Jet injector
First Claim
1. An injector for delivering a fluid medicament to a patient which comprises:
- a base member having a surface;
a skirt having a rim, said skirt extending outwardly from said surface to position said rim thereof at a distance from said surface, said skirt and said surface of said base member defining a compartment therebetween;
an injection tube having a tip extending outwardly from said surface and through said compartment for injecting the fluid medicament into the patient;
an abutment projecting from said surface of said base member and into said compartment between said skirt and said injection tube; and
a suction means in fluid communication with said compartment through said surface of said base member for creating a partial vacuum in said compartment when said rim of said skirt is held against the patient, said suction means drawing skin into contact with said abutment to urge said tip of said injection tube against the skin of the patient to establish an interface seal therebetween, and to stabilize skin adjacent said tip, against said tip, to minimize movement of skin relative to said tip during an injection of fluid medicament.
3 Assignments
0 Petitions
Accused Products
Abstract
An injector for the intra-muscular, subcutaneous, or intra-dermal delivery of a fluid medicament to a patient includes a cylindrical member which has a closed end and an open end, and which is formed with a compartment between these two ends. An injection tube extends from the closed end through the cylindrical member and into the compartment. A suction pump is connected in fluid communication with the compartment to create a partial vacuum in the compartment when the open end of the cylindrical member is held against the skin of the patient. Due to this vacuum, skin of the patient is drawn into the compartment to position the tip of the injection tube against the skin. Also, skin that is adjacent the tip is drawn by the vacuum into the compartment. This stabilizes the skin around the injection tube tip and thereby minimizes any movement of skin relative to the tip during an injection of fluid medicament into the patient.
176 Citations
18 Claims
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1. An injector for delivering a fluid medicament to a patient which comprises:
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a base member having a surface;
a skirt having a rim, said skirt extending outwardly from said surface to position said rim thereof at a distance from said surface, said skirt and said surface of said base member defining a compartment therebetween;
an injection tube having a tip extending outwardly from said surface and through said compartment for injecting the fluid medicament into the patient;
an abutment projecting from said surface of said base member and into said compartment between said skirt and said injection tube; and
a suction means in fluid communication with said compartment through said surface of said base member for creating a partial vacuum in said compartment when said rim of said skirt is held against the patient, said suction means drawing skin into contact with said abutment to urge said tip of said injection tube against the skin of the patient to establish an interface seal therebetween, and to stabilize skin adjacent said tip, against said tip, to minimize movement of skin relative to said tip during an injection of fluid medicament. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15)
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12. An injector for delivering a fluid medicament to a patient which comprises:
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a hollow substantially cylindrical member defining a central axis and having a closed end and an open end and formed with a compartment between said closed end and said open end;
an injection tube having a tip extending along said central axis from said closed end;
suction means in fluid communication with said compartment for creating a partial vacuum therein when said open end of said cylindrical member is held against the patient, said vacuum drawing the skin of the patient into said compartment to position said tip of said injection tube against the skin and to stabilize skin adjacent said tip against movement of skin relative to said tip during injection of fluid medicament through said tube;
an abutment extending from said closed end into said compartment between said cylindrical member and said injection tube to limit the drawing of skin into said compartment; and
a drive means connected to said injection tube for expelling fluid medicament through said injection tube during an injection of fluid medicament. - View Dependent Claims (16)
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17. A method for delivering a medical medicament to a patient which includes the steps of:
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positioning an injector against the skin of the patient, said injector including a hollow substantially cylindrical member having a closed end and an open end and formed with a compartment therebetween, an injection tube having a tip extending from said closed end, a suction means in fluid communication with said compartment, an abutment extending from said closed end into said compartment between said cylindrical member and said injection tube, and a drive means connected with said injection tube for injecting fluid medicament therethrough;
holding said open end of said cylindrical member against the patient;
activating said suction means to create a partial vacuum in said compartment, said vacuum drawing the skin of the patient into the compartment and against said abutment to position said tip of said injection tube against the skin and to stabilize skin against movement thereof relative to said tip during injection of fluid medicament through said tube; and
activating said drive means to expel fluid medicament through said injection tube for subcutaneous delivery of fluid medicament to the patient. - View Dependent Claims (18)
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Specification