Pre-slit injection site and tapered cannula
First Claim
1. A cannula insertion member for being inserted into a pre-slit resealable injection site, said insertion member comprising:
- a tube having a central bore that extends throughout said tube for an entire length of said tube and terminates at an aperture that has substantially the same cross-sectional circumference as at least portions of the central bore, the central bore defining a fluid flow path therein, said tube having a distal end region for penetrating said resealable injection site;
said distal end region defining the aperture in the distal end of said distal end region through which fluid can flow to or from said fluid flow path;
said distal end region including a tapered exterior surface to facilitate insertion, said distal end being so constructed and arranged to allow multiple insertions into said resealable injection site and allowing the injection site to reseal after each such insertion; and
locking means for removably locking said cannula insertion member to said resealable injection site.
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Accused Products
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.
408 Citations
31 Claims
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1. A cannula insertion member for being inserted into a pre-slit resealable injection site, said insertion member comprising:
a tube having a central bore that extends throughout said tube for an entire length of said tube and terminates at an aperture that has substantially the same cross-sectional circumference as at least portions of the central bore, the central bore defining a fluid flow path therein, said tube having a distal end region for penetrating said resealable injection site; said distal end region defining the aperture in the distal end of said distal end region through which fluid can flow to or from said fluid flow path; said distal end region including a tapered exterior surface to facilitate insertion, said distal end being so constructed and arranged to allow multiple insertions into said resealable injection site and allowing the injection site to reseal after each such insertion; and locking means for removably locking said cannula insertion member to said resealable injection site.
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2. A cannula and injection site in combination comprising:
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a resealable injection site having a housing defining a fluid flow path therein and having a pre-slit sealing means for sealing said housing; a blunt cannula having a tube with a central bore that extends throughout said tube and terminates at an aperture, the central bore 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 with a tapered surface and a blunt radiused tip that circumscribes the aperture; locking means for removably locking said blunt cannula to said resealable injection site; and said sealing means sealing the injection site upon removal of the cannula from the sealing means. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10)
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11. A cannula insertion member for being inserted into a pre-slit resealable injection site, said insertion member comprising:
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a tube having a central bore throughout said tube, defining a fluid flow path therein, said tube having a distal end region for penetrating said injection site; said distal end region defining at least one aperture in the distal end of said distal end region through which fluid can flow to or from said fluid flow path; said distal end region including a tapered exterior surface to facilitate insertion; said distal end further including a radiused tip adjacent said tapered surface, said radiused tip defining, at least in part, the at least one aperture, the radiused tip reducing the insertion force into the slit of said injection site; and locking means for removably locking said cannula insertion member to said pre-slit resealable injection site.
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12. A cannula insertion member for being inserted into a pre-slit resealable injection site, said insertion member comprising:
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a tube having a central bore throughout said tube defining a fluid flow path therein, said tube having a distal end region terminating in an aperture and including a blunt radiused tip for penetrating said injection site; locking means for removably locking said cannula insertion member to said pre-slit resealable injection site; and said tube including a tapered surface and cooperating with the resealable injection site to maintain a seal after removal of the cannula from the site.
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13. 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 pre-slit resealable sealing means for sealing said housing; a blunt cannula having a tube with a central bore throughout said tube, defining a fluid flow path therein, said tube extending through said sealing means to establish a sealed fluid flow connection with 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, said distal region defining, at an extreme distal end thereof, an aperture; said tube having a generally cylindrical region merging with said tapered distal end region, said cylindrical region being received within said sealing means; and locking means for removably locking said cannula to said injection site. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. A cannula and injection site comprising:
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a cannula including a tube having a fluid flow path therethrough terminating in an aperture that is defined by a blunt end that prevents inadvertent penetration of a person'"'"'s skin during use; an injection site including a resealable septum having a slit for receiving a portion of the blunt end of the cannula and establishing fluid communication between the tube and an interior portion of the injection site, the septum sealing the injection site after removal of the blunt end of the cannula from the slit of the septum; and locking means for removably locking said cannula to said injection site.
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23. A cannula and injection site comprising:
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a cannula including a tube having a fluid flow path therethrough terminating in an aperture that is defined by a blunt end; an injection site including a resealable septum having a slit for receiving a portion of the blunt end of the cannula and establishing fluid communication between the tube and an interior portion of the injection site, the septum sealing the injection site after removal of the blunt end of the cannula from the slit of the septum; and locking means for removably locking said cannula to said injection site. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31)
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Specification