Injection device and method
First Claim
1. A fluid dispensing device for selectively dispensing a fluid at a controlled slow rate into a patient comprising:
- container means defining a fluid chamber therein for containing the fluid to be dispensed and defining a fluid outlet therefrom through which the fluid is to be dispensed into the patient;
expelling means operatively associated with the fluid in said container means to expel the liquid from said container means, said expelling means including a piston member slidably mounted in said fluid chamber for positively forcing the fluid from said fluid outlet as said piston member moves toward said fluid outlet, said piston member moved toward said fluid outlet when said expelling means is driven;
electrically operated driving means for selectively driving said expelling means to force said piston member toward said fluid outlet;
an electrical power supply; and
,control means for selectively and successively connecting said electrically operated driving means to said electrical power supply to cause said piston member to successively and incrementally force the fluid from said fluid outlet in said container means into the patient at a selected prescribed average rate over a prolonged period of time, said control means alternatively connecting said driving means to said electrical power supply for a first prescribed short period of time of fixed duration so that said driving means causes said expelling means to force fluid from said fluid outlet in said container means at a first prescribed rate greater than the selected prescribed average rate and said control means alternatively disconnecting said driving means from said electrical power supply for a second prescribed short period of time to stop the fluid flow from said fluid outlet so that the fluid is forced from said fluid outlet in said container at the selected prescribed average rate over the sum of said first and second periods of time, said control means including adjustment means for selectively varying the duration of only said second prescribed short period of time without varying the duration of said first prescribed period of time to selectively vary the selected prescribed average rate at which the fluid is forced from said fluid outlet of said container into the patient.
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Accused Products
Abstract
Method and apparatus for injecting fluids into patients at a controlled rate from an ampule with a tubular side wall closed at one end with a penetrable plug and a sliding piston in the side wall to force the fluid through an opening in the penetrable member using either a long duration injector with an expelling means to move the ampule piston, drive means for operating the expelling means, and control means for incrementally and successively connecting and disconnecting the drive means to the expelling means or a short duration injector with a spring drive or a fluid pressure drive to move the ampule piston and meter the fluid through a metering device.
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Citations
18 Claims
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1. A fluid dispensing device for selectively dispensing a fluid at a controlled slow rate into a patient comprising:
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container means defining a fluid chamber therein for containing the fluid to be dispensed and defining a fluid outlet therefrom through which the fluid is to be dispensed into the patient; expelling means operatively associated with the fluid in said container means to expel the liquid from said container means, said expelling means including a piston member slidably mounted in said fluid chamber for positively forcing the fluid from said fluid outlet as said piston member moves toward said fluid outlet, said piston member moved toward said fluid outlet when said expelling means is driven; electrically operated driving means for selectively driving said expelling means to force said piston member toward said fluid outlet; an electrical power supply; and
,control means for selectively and successively connecting said electrically operated driving means to said electrical power supply to cause said piston member to successively and incrementally force the fluid from said fluid outlet in said container means into the patient at a selected prescribed average rate over a prolonged period of time, said control means alternatively connecting said driving means to said electrical power supply for a first prescribed short period of time of fixed duration so that said driving means causes said expelling means to force fluid from said fluid outlet in said container means at a first prescribed rate greater than the selected prescribed average rate and said control means alternatively disconnecting said driving means from said electrical power supply for a second prescribed short period of time to stop the fluid flow from said fluid outlet so that the fluid is forced from said fluid outlet in said container at the selected prescribed average rate over the sum of said first and second periods of time, said control means including adjustment means for selectively varying the duration of only said second prescribed short period of time without varying the duration of said first prescribed period of time to selectively vary the selected prescribed average rate at which the fluid is forced from said fluid outlet of said container into the patient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A fluid dispensing device for intravenously dispensing fluid to a patient at an average prescribed rate over a prolonged period of time including:
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container means containing the fluid to be dispensed, said container means comprising; an ampule assembly comprising a seamless tubular side wall defining a passage therethrough opening onto opposite ends of said side wall, a penetrable member closing one end of said passage at one end of said side wall, and a piston member slidably received in said passage from that end of said tubular side wall opposite said penetrable member and in sealing engagement with said tubular side wall, said tubular side wall, said piston member and said penetrable member defining a closed fluid chamber filled with the fluid; an ampule holder defining an ampule receiving chamber therein having a diameter larger than the diameter of said seamless tubular side wall of said ampule assembly and an ampule adapter defining an ampule passage therein centered in said ampule adapter and sized to slidably receive said side wall of said ampule therein to maintain said ampule assembly centered in said ampule adapter, said ampule adapter slidably received in said ampule receiving chamber in said ampule holder, and said ampule adapter including locating means for maintaining said ampule holder and said ampule assembly coaxially centered in said ampule receiving chamber in said ampule holder; a piercing assembly including a piercing member defining a fluid outlet therethrough and having a sharpened piercing point thereon for selectively penetrating said penetrable member on said ampule assembly to place said fluid outlet in communication with the fluid in said fluid chamber, and a cover assembly for enhancing the sterility of said piercing member, said cover assembly comprising a penetrable cover member capable of being penetrated by the piercing point on said piercing member, positioning means for selectively positioning said penetrable cover member in alignment with the piercing point of said piercing member so that said penetrable cover member is movable axially of said piercing member from a non-use position in which the piercing point of said piercing member is enclosed by said positioning means and said penetrable cover member to a use position in which the piercing point of said piercing member is exposed by penetrating the penetrable cover member, and urging means for urging said penetrable cover member toward its non-use position; expelling means operatively connected to said piston member for selectively forcing said piston member toward said penetrable member to selectively expel the fluid through said fluid outlet, said expelling means including an electric drive motor for causing the piston to expel fluid from said ampule assembly when said motor is driven; driving means including an electrical power supply for driving said motor when said power supply is connected to said motor; a manifold block defining a delivery chamber having a common outlet and at least one transfer chamber therein, said transfer chamber connected to said delivery chamber and having a inlet thereto selectively connectable to said fluid outlet on said container means, a common delivery tube connected to the common outlet of said delivery chamber and intravenously connectable to the patient, and check valve means operatively associated with the inlet to said transfer chamber to permit fluid to flow into said transfer chamber, through said delivery chamber and than through said common delivery tube into said patient when said fluid outlet on said container means is connected to the inlet of said transfer chamber and to prevent the flow of fluid out of said transfer chamber through the inlet to said transfer chamber when said fluid outlet on said container means is disconnected from the inlet to said transfer chamber; and
,control means for alternatively and successively connecting said motor to and disconnecting said motor from said power supply a plurality of times over the prolonged period of time to incrementally and successively drive said motor, said control means connecting said motor to said power supply for a first prescribed short period of time much less than the prolonged period of time each time said drive motor is connected to said power supply to cause the fluid to be expelled from said container means intravenously into the patient via said manifold block at a first prescribed rate greater than the average prescribed rate; and
disconnecting said drive motor from said power supply for a second prescribed short period of time less than the prolonged period of time each time said drive motor is disconnected from said power supply so that the fluid is injected into the patient at the average prescribed rate over the sum of said first and second short periods of time during the prolonged period of time, said control means further including adjustment means for selectively varying said second prescribed short periods of time during which said drive motor is disconnected from said power supply while maintaining said first prescribed short periods of time during which said drive motor is connected to said power supply substantially constant to selectively change the average prescribed rate of injection of the fluid into the patient. - View Dependent Claims (18)
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Specification