Injection device with secondary reservoir
First Claim
1. An injection mechanism for injecting fluid into a targeted tissue layer comprising:
- a primary reservoir for storing fluid prior to injection and filling a secondary reservoir with a dosage amount of fluid to be injected;
a secondary reservoir for receiving and holding the dosage amount of fluid to be injected from the first reservoir, wherein the secondary reservoir is in series with the primary reservoir and has a smaller cross-sectional area than the cross-sectional area of the primary reservoir; and
a needle connecting portion comprising a sliding seal, a needle assembly, and a needle stop, wherein the sliding seal comprises a needle septum disposed at least partially within the secondary reservoir and having a cross-sectional area smaller than the cross-sectional area of the primary reservoir; and
a patient needle disposed at least partially within the needle septum of the sliding seal, and for penetrating the skin of the patient to inject the dosage amount of fluid of the secondary reservoir in the targeted tissue layer during injection, wherein said patient needle has an exposed length of between approximately 0.5 mm and approximately 5 mm.
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Accused Products
Abstract
A method and apparatus for injecting fluid into areas having high density tissue that creates a high backpressure resistance on the injection device is disclosed. The high backpressure resistance is overcome through a mechanical advantage achieved by using a secondary reservoir having a cross-sectional area smaller than the cross-sectional area of a primary reservoir. Exemplary injection device reservoir housings may comprise a primary reservoir, a secondary reservoir, a check valve, a septum penetrating cannula, travel limits, a pen needle connecting portion, sliding seal guide ribs, a sliding seal, a pen needle assembly, a needle stop, and a patient needle.
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Citations
20 Claims
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1. An injection mechanism for injecting fluid into a targeted tissue layer comprising:
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a primary reservoir for storing fluid prior to injection and filling a secondary reservoir with a dosage amount of fluid to be injected; a secondary reservoir for receiving and holding the dosage amount of fluid to be injected from the first reservoir, wherein the secondary reservoir is in series with the primary reservoir and has a smaller cross-sectional area than the cross-sectional area of the primary reservoir; and a needle connecting portion comprising a sliding seal, a needle assembly, and a needle stop, wherein the sliding seal comprises a needle septum disposed at least partially within the secondary reservoir and having a cross-sectional area smaller than the cross-sectional area of the primary reservoir; and a patient needle disposed at least partially within the needle septum of the sliding seal, and for penetrating the skin of the patient to inject the dosage amount of fluid of the secondary reservoir in the targeted tissue layer during injection, wherein said patient needle has an exposed length of between approximately 0.5 mm and approximately 5 mm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An injection mechanism for injecting fluid into a targeted tissue layer comprising:
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a primary reservoir for storing fluid prior to injection and filling a secondary reservoir with a dosage amount of fluid to be injected; a secondary reservoir for receiving and holding the dosage amount of fluid to be injected from the first reservoir, wherein the secondary reservoir is in series with the primary reservoir and has a smaller cross-sectional area than the cross-sectional area of the primary reservoir; a needle connecting portion comprising a sliding seal, a needle assembly, and a needle stop, wherein the sliding seal comprises a needle septum disposed at least partially within the secondary reservoir and having a cross-sectional area smaller than the cross-sectional area of the primary reservoir; and a patient needle disposed at least partially within the needle septum of the sliding seal, and for penetrating the skin of the patient to inject the dosage amount of fluid of the secondary reservoir in the targeted tissue layer during injection; and a check valve located between the primary and secondary reservoirs for preventing fluid from leaking from the secondary reservoir back into the primary reservoir or medicament cartridge. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification