Electrically powered jet injector
First Claim
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1. A jet injector for providing a jet injection by driving a plunger into an ampule, comprising:
- a housing;
an electric motor supported by the housing;
a ball screw driven longitudinally within the housing by the motor;
a controller electrically connected to the motor for controlling the motor speed and direction;
an encoder electrically connected to the controller and positioned to measure rotation of the ball screw, the encoder comprising an encoder wheel rotating in proportion to rotation of the motor;
a detector electrically linked to the controller and positioned to detect when the ball screw contacts the plunger; and
means for attaching the ampule to the housing.
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Abstract
An electrically powered jet injector impacts a plunger driver against a plunger to generate a high initial pressure pulse, for piercing the skin. The plunger driver then continues to generate a lower delivery pressure until the injection is completed. A microprocessor within the injector controls the speed and direction of the electric motor which moves the plunger driver. The injector provides a subcutaneous injection especially useful for injecting insulin to treat diabetes.
143 Citations
22 Claims
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1. A jet injector for providing a jet injection by driving a plunger into an ampule, comprising:
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a housing; an electric motor supported by the housing; a ball screw driven longitudinally within the housing by the motor; a controller electrically connected to the motor for controlling the motor speed and direction; an encoder electrically connected to the controller and positioned to measure rotation of the ball screw, the encoder comprising an encoder wheel rotating in proportion to rotation of the motor; a detector electrically linked to the controller and positioned to detect when the ball screw contacts the plunger; and means for attaching the ampule to the housing. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A jet injector for providing a jet injection by driving a plunger into an ampule, comprising:
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a housing; an electric motor supported by the housing; a ball screw driven longitudinally within the housing by the motor; a controller electrically connected to the motor for controlling the motor speed and direction; an encoder electrically connected to the controller and positioned to measure rotation of the ball screw; a switch electrically linked to the controller and positioned to actuate when the ball screw contacts the plunger; and means for attaching the ampule to the housing. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A jet injector for providing a jet injection by driving a plunger into an ampule, comprising;
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a housing; an electric motor supported by the housing; a ball screw coaxial with the motor and driven longitudinally within the housing by the motor; a controller electrically connected to the motor for controlling the motor speed and direction; an encoder electrically connected to the controller and positioned to measure rotation of the ball screw; a detector electrically linked to the controller and positioned to detect when the ball screw contacts the plunger; and means for attaching the ampule to the housing. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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Specification