Self-injection device
First Claim
1. A medicament delivery device, comprising:
- a body having a reservoir disposed therein for containing a medicament, the reservoir including a flexible reservoir wall;
a plunger movable within the body for causing the medicament to be expelled from the reservoir, the plunger having a contact surface that is not affixed to said flexible reservoir wall;
a spring biasing the plunger in a pre-activated position toward the reservoir; and
means for selectively maintaining the plunger in the pre-activated position with respect to the reservoir and, upon releasing the plunger from the pre-activated position, for guiding the plunger to move under a force of the spring such that the contact surface of the plunger contacts the flexible reservoir wall to pressurize the reservoir for delivery of the medicament to a patient;
wherein the means for selectively maintaining the plunger in the pre-activated position with respect to the reservoir and, upon releasing the plunger from the pre-activated position, for guiding the plunger, comprises;
a retention plate disposed within the body, wherein the spring is disposed between the retention plate and the plunger;
first guide means provided on one of the retention plate and the plunger, the first guide means having a portion with a predetermined size and shape; and
second guide means provided on the other one of the retention plate and the plunger and having a size and shape complementary to the size and shape of the portion of the first guide means, the first guide means and the second guide means maintaining the plunger in a first position with respect to the reservoir;
wherein upon activation of the device, one of the retention plate and the plunger rotates with respect to a non-rotating one of the retention plate and the plunger such that the first guide means aligns with the second guide means causing the plunger to be released from the first position and allowing the plunger to move under the force of the spring to pressurize the reservoir for delivery of the medicament to a patient.
1 Assignment
0 Petitions
Accused Products
Abstract
A drug delivery device, including a body having a reservoir disposed therein for containing a medicament, the reservoir including a flexible wall; a plunger movable within the body for causing the medicament to be expelled from the reservoir, the plunger having a contact surface that is not affixed to said flexible reservoir wall; a spring biasing the plunger toward the reservoir; and means for selectively maintaining the plunger in a pre-activated position with respect to the reservoir and, upon releasing the plunger from the pre-activated position, for guiding the plunger to move under the force of the spring such that the contact surface of the plunger contacts the flexible reservoir wall to pressurize the reservoir for delivery of the medicament to a patient.
161 Citations
21 Claims
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1. A medicament delivery device, comprising:
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a body having a reservoir disposed therein for containing a medicament, the reservoir including a flexible reservoir wall; a plunger movable within the body for causing the medicament to be expelled from the reservoir, the plunger having a contact surface that is not affixed to said flexible reservoir wall; a spring biasing the plunger in a pre-activated position toward the reservoir; and means for selectively maintaining the plunger in the pre-activated position with respect to the reservoir and, upon releasing the plunger from the pre-activated position, for guiding the plunger to move under a force of the spring such that the contact surface of the plunger contacts the flexible reservoir wall to pressurize the reservoir for delivery of the medicament to a patient; wherein the means for selectively maintaining the plunger in the pre-activated position with respect to the reservoir and, upon releasing the plunger from the pre-activated position, for guiding the plunger, comprises; a retention plate disposed within the body, wherein the spring is disposed between the retention plate and the plunger; first guide means provided on one of the retention plate and the plunger, the first guide means having a portion with a predetermined size and shape; and second guide means provided on the other one of the retention plate and the plunger and having a size and shape complementary to the size and shape of the portion of the first guide means, the first guide means and the second guide means maintaining the plunger in a first position with respect to the reservoir; wherein upon activation of the device, one of the retention plate and the plunger rotates with respect to a non-rotating one of the retention plate and the plunger such that the first guide means aligns with the second guide means causing the plunger to be released from the first position and allowing the plunger to move under the force of the spring to pressurize the reservoir for delivery of the medicament to a patient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A wearable medicament delivery device, comprising:
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a body having a reservoir disposed therein for containing a medicament, the reservoir including a flexible reservoir wall; a plunger movable within the body for causing the medicament to be expelled from the reservoir, the plunger having a contact surface that is not affixed to said flexible reservoir wall; a spring biasing the plunger in a pre-activated position toward the reservoir; and means for selectively maintaining the plunger in the pre-activated position with respect to the reservoir and, upon releasing the plunger from the pre-activated position, for guiding the plunger to move under a force of the spring such that the contact surface of the plunger contacts the flexible reservoir wall to pressurize the reservoir for delivery of the medicament to a patient; and an adhesive disposed on a surface of the infusion device, the adhesive being adapted to attach the device to a skin surface of a patient, enabling the patient to wear the device during medicament delivery over an extended period of time; wherein the means for selectively maintaining the plunger in the pre-activated position with respect to the reservoir and, upon releasing the plunger from the pre-activated position, for guiding the plunger, comprises a housing disposed within the body, the plunger and spring being disposed within the housing; wherein the plunger includes at least one tab extending from an outer edge thereof and moving axially therewith; and wherein the housing includes at least one opening with a tab engaging portion for selectively engaging the plunger tab and at least one recessed channel for guiding the at least one plunger tab during plunger movement under the force of the spring to pressurize the reservoir. - View Dependent Claims (16, 17, 18)
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19. A medicament delivery device, comprising:
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a body having a reservoir disposed therein for containing a medicament, the reservoir including a flexible reservoir wall; a plunger movable within the body for causing the medicament to be expelled from the reservoir, the plunger having a contact surface that is not affixed to said flexible reservoir wall; a spring biasing the plunger in a pre-activated position toward the reservoir; means for selectively maintaining the plunger in the pre-activated position with respect to the reservoir and, upon releasing the plunger from the pre-activated position, for guiding the plunger to move under a force of the spring such that the contact surface of the plunger contacts the flexible reservoir wall to pressurize the reservoir for delivery of the medicament to a patient; and a rotor rotatably disposed about the housing and being rotatable between a pre-activated position and an activated position; wherein the means for selectively maintaining the plunger in the pre-activated position with respect to the reservoir and, upon releasing the plunger from the pre-activated position, for guiding the plunger, comprises a housing disposed within the body, the plunger and spring being disposed within the housing; wherein the plunger includes at least one tab extending from an outer edge thereof; wherein the housing includes at least one opening with a tab engaging portion for selectively engaging the plunger tab and at least one recessed channel for guiding the at least one plunger tab during plunger movement under the force of the spring to pressurize the reservoir; and wherein during rotation from the pre-activated position to the activated position, a tab engaging surface of the rotor rotates the plunger tab from engagement with the tab engaging portion of the housing to alignment with the recessed channel, thereby permitting the plunger to move under the force of the spring to pressurize the reservoir for delivery of the medicament to a patient.
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20. A medicament delivery device, comprising:
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a body having a reservoir disposed therein for containing a medicament; a plunger movable within the body for causing the medicament to be expelled from the reservoir; a spring biasing the plunger in a pre-activated position toward the reservoir; a retention plate disposed within the body, wherein the spring is disposed between the retention plate and the plunger; a first guide unit provided on one of the retention plate and the plunger, the first guide unit having a portion with a predetermined size and shape; and a second guide unit provided on the other one of the retention plate and the plunger and having a size and shape complementary to the size and shape of the first guide unit, the first guide unit and the second guide unit maintaining the plunger in a first position with respect to the reservoir; wherein upon activation of the device, one of the retention plate and the plunger rotates with respect to a non-rotating one of the retention plate and the plunger such that the first guide unit aligns with the second guide unit causing the plunger to be released from the first position and allowing the plunger to move under the force of the spring to pressurize the reservoir for delivery of the medicament to a patient.
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21. A medicament delivery device, comprising:
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a body having a reservoir disposed therein for containing a medicament, the reservoir including a flexible wall; a plunger movable within the body for causing the medicament to be expelled from the reservoir, the plunger having at least one tab extending from an outer edge thereof and moving axially therewith, and a contact surface that is not affixed to said flexible reservoir wall; a spring biasing the plunger in a pre-activated position toward the reservoir; a valve connecting the reservoir with a patient needle; and a housing disposed within the body, the plunger and spring being disposed within the housing; wherein the housing includes at least one opening with a tab engaging portion for selectively engaging the plunger tab for maintaining the plunger in a pre-activated position, the housing also including at least one recessed channel for guiding the at least one plunger tab upon releasing the plunger from the pre-activated position, to move under the force of the spring such that the contact surface of the plunger contacts the flexible reservoir wall to pressurize the reservoir for delivery of the medicament to a patient; wherein the valve is disposed outside the housing.
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Specification