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 having a first axis;
a secondary reservoir for holding the amount of fluid to be injected having a second axis, wherein the secondary reservoir is located co-axially and 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 forming one side of the secondary reservoir and through which the fluid to be injected passes from the collapsing secondary reservoir during the injection; and
a patient needle for intersecting the needle septum of the sliding seal, and for penetrating the skin of the patient to inject the fluid in the targeted tissue layer.
5 Assignments
0 Petitions
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.
-
Citations
23 Claims
-
1. An injection mechanism for injecting fluid into a targeted tissue layer comprising:
-
a primary reservoir for storing fluid prior to injection having a first axis; a secondary reservoir for holding the amount of fluid to be injected having a second axis, wherein the secondary reservoir is located co-axially and 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 forming one side of the secondary reservoir and through which the fluid to be injected passes from the collapsing secondary reservoir during the injection; and a patient needle for intersecting the needle septum of the sliding seal, and for penetrating the skin of the patient to inject the fluid in the targeted tissue layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A method for injecting fluid into an intradermal tissue layer of a patient comprising the steps of:
-
transferring fluid from a primary reservoir with a first cross-sectional area into a secondary reservoir having a second cross-sectional area less than that of said first cross- sectional area; preventing said fluid from flowing from the secondary reservoir back into the primary reservoir; and pressurizing the fluid in said secondary reservoir to force it into said intradermal tissue layer of a patient. - View Dependent Claims (11, 12, 13, 14, 15)
-
-
16. An apparatus for delivery of compounds to the intradermal tissue of a patient'"'"'s skin, the apparatus comprising:
-
a reservoir housing having a distal end and a proximal end, and defining a primary reservoir, and a secondary reservoir in fluid communication; a pen needle assembly mounted to the distal end of the reservoir housing; a needle securely mounted to the pen needle assembly in fluid communication with the secondary reservoir and extending distally from the pen needle assembly; and a needle stop having a skin-engaging surface disposed in a preselected position with respect to the pen needle assembly such that a preselected portion of the needle extends distally from the skin-engaging surface; wherein the reservoir housing further comprises a lower sleeve slidingly engaged to an upper sleeve, and movable from a first position to a second position during injection; and wherein, when the lower sleeve is in the first position, the secondary reservoir has a first volume and when the lower sleeve is in the second position, the secondary reservoir has a second volume, and wherein the second volume is less than the first volume. - View Dependent Claims (17, 18, 19)
-
-
20. An apparatus for delivery of compounds to the intradermal tissue of a patient'"'"'s skin, the apparatus comprising:
-
a reservoir housing having a distal end and a proximal end, and defining a primary reservoir, and a secondary reservoir in fluid communication; a pen needle assembly mounted to the distal end of the reservoir housing; a needle securely mounted to the pen needle assembly in fluid communication with the secondary reservoir and extending distally from the pen needle assembly; and a needle stop having a skin-engaging surface disposed in a preselected position with respect to the pen needle assembly such that a preselected portion of the needle extends distally from the skin-engaging surface; wherein the reservoir housing further comprises a lower sleeve slidingly engaged to an upper sleeve, and movable from a first position to a second position; and a sliding seal operably engaged to the lower housing and disposed, at least in part, within the secondary reservoir for sliding movement. - View Dependent Claims (21, 22, 23)
-
Specification