Pre-slit injection site and tapered cannula
First Claim
Patent Images
1. A cannula and injection site in combination comprising:
- an injection site having a housing defining a fluid flow path therein and having a penetrable sealing means for sealing said housing;
a cannula having at least one tube defining a fluid flow path therein, said tube extending through said sealing means to establish a sealed fluid flow connection with said injection site, said tube having a distal end region extending beyond said injection site and having a tapered surface on said distal end region; and
said tube defining in said distal end region a plurality of elongate slots oriented parallel to said fluid flow path, each slot extending from said flow path to the exterior of said tube thereby decreasing the exterior contact surface area of said tube and accommodating a lateral discharge of fluid from said tube.
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Abstract
A pre-slit injection site includes a housing with a flow path therethrough. A first end of the housing carries a pre-slit septum. One form of a blunt cannula, usable with the injection site, carries a locking member. When the pre-slit injection site slidably receives the blunt cannula, the locking member latches to the injection site and creates a mechanically coupled unit. Another form of the cannula includes a tube having a tapered distal end region and having elongate discharge slots for reducing contact surface area and for directing the flow laterally out of the cannula. The cannula may also include a rounded lead post, an annular barb, and axially oriented grooves.
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Citations
28 Claims
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1. A cannula and injection site in combination comprising:
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an injection site having a housing defining a fluid flow path therein and having a penetrable sealing means for sealing said housing; a cannula having at least one tube defining a fluid flow path therein, said tube extending through said sealing means to establish a sealed fluid flow connection with said injection site, said tube having a distal end region extending beyond said injection site and having a tapered surface on said distal end region; and said tube defining in said distal end region a plurality of elongate slots oriented parallel to said fluid flow path, each slot extending from said flow path to the exterior of said tube thereby decreasing the exterior contact surface area of said tube and accommodating a lateral discharge of fluid from said tube.
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2. An injection site adapted for use with a blunt cannula comprising:
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a pre-slit septum axially compressed within a housing and having an easily wipeable outer surface, the septum having a sufficient thickness to seal completely around the blunt cannula upon insertion; the housing having an end circumjacent the septum, the end having a portion that extends radially inward and applies an axial compressive force to the septum; and
,a luer-type fitting carried by the housing at a housing end opposite the septum. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10)
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11. An injection site adapted to be used with a blunt cannula comprising:
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a housing defining a fluid flow channel therethrough, the housing having a first end and a second end; a resilient sealing member, carried by the housing overlying the channel for sealing the first end, the sealing member being formed with a resealable opening therein extending at least partway therethrough and having an exterior peripheral surface, the sealing member having a thickness that is sufficient to seal completely around the blunt cannula upon insertion; the housing having an end circumjacent the exterior peripheral surface, the end having a portion that extends radially inward and applies an axial compressive force to the sealing member which generates resealing radial forces to urge the resealable opening into a closed condition; a slidably engageable connector member at the second end and in fluid communication with the flow channel; and
,a threaded connector carried by the housing at the second end, the threaded connector being spaced radially outward from the slidably engageable connector member. - View Dependent Claims (12)
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13. An injection site adapted for use with a blunt cannula comprising:
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a housing defining a fluid flow path through the housing; and
,a resealable septum contained within the housing and fluidly sealing the fluid flow path, the septum having a resealable opening having an axial length through the septum, wherein the septum is capable of maintaining fluid sealing contact with the blunt cannula along substantially the entire axial length of the resealable opening when the blunt cannula is inserted through the septum. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. An injection site adapted for use with a blunt cannula comprising:
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a housing defining a fluid flow path through the housing; a pre-slit, resealable septum contained within the housing and fluidly sealing the fluid flow path, the septum having an easily wipeable outer surface proximate an axially outermost portion of a housing end; and
,a housing end opposite the septum carrying a fluid coupling. - View Dependent Claims (23, 24, 25, 26)
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27. An injection site for use with a blunt cannula comprising:
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a housing having an annular ridge which defines an annular channel, the annular channel positioned radially outward from and adjacent to the annular ridge, the annular channel and the annular ridge having substantially equal axial heights; and
,a pre-slit septum axially compressed between a housing end and the annular ridge, wherein the septum is moveable from a first position contacting the annular ridge and outside the annular channel prior to compression to a second position contacting the annular ridge and extending into the annular channel after compression. - View Dependent Claims (28)
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Specification