Port cannula arrangement for connection to a port

Claim 2

Port cannula arrangement (10) for puncturing the septum of an internally located port with minimal material damage with a metal cannula (12) which is surface-ground at the distal end (20), and which proceeds into a connecting piece (14) at its proximal end (36), characterized as follows: a valve (46) which closes off access to the metal cannula (12) which is never exposed to blood under full vascular pressure in a germ proof manner is located within the connecting piece (14); the geometry of this valve is designed to allow the valve to be opened when the connecting piece is entered by a section of a complementary connecting piece for the purpose of establishing a connection to a syringe or similar device.

Claim 3

Port cannula arrangement as in claim 1, further characterized as follows: the valve is a valve disk (46) with a slot (48), which extends transversely across the connecting piece (14), said valve (46) being held in a ring-shaped groove (44).

Claim 4

Port cannula arrangement as in claim 1, further characterized as follows: a tubular operating element (60) is located between the insertion opening (54) and the valve disk (46); this operating element is guided in a longitudinally displaceable manner, such that in its retracted position, its end facing the valve disk (46) lies adjacent to the disk (46); in its advanced position, the operating element at least partially penetrates this disk for the purpose of opening the slot (48).

Claim 5

Port cannula arrangement as in claim 2, further characterized as follows: a tubular operating element (60) is located between the insertion opening (54) and the valve disk (46); this operating element is guided in a longitudinally displaceable manner, such that in its retracted position, its end facing the valve disk (46) lies adjacent to the disk (46); in its advanced position, the operating element at least partially penetrates this disk for the purpose of opening the slot (48).

Claim 6

Port cannula arrangement as in claim 2, further characterized in that the valve disk (46) is of elastomeric material.

Claim 7

Port cannula arrangement as in claim 3, further characterized in that the valve disk (46) is of elastomeric material.

Claim 8

Port cannula arrangement as in claim 4, further characterized in that the valve disk (46) is of elastomeric material.

Claim 9

Apparatus (10) for connection to a container having an extension providing a duct for introducing fluid from said container into a body or, selectively, for passing fluid from said body through said duct into said container, said apparatus comprising: (a) a cannula (12) having a first end (24) and a second end (36), (b) an opening (30) in the first end (24) of said cannula (12) to be placed in communication with the interior of said body, (c) a connecting piece (14) having a first end (42) and a second end (38), the first end (42) of said connecting piece (14) being secured to the second end (36) of said cannula (12), (d) a hollow portion within said connecting piece (14), said hollow portion having a first chamber (50) and a second chamber (52), (e) said second chamber (52) communicating with the interior (18) of said cannula (12), (f) a resilient valve disc (46) mounted within said hollow portion of said connecting piece (14) between said first chamber (50) and said second chamber (52), said resilient valve disc (46) having a first face facing said first chamber (50) and a second face opposite said first face and facing said second chamber (52), (g) a slot (48) formed in said resilient valve disc (46) and extending from said first face to said second face thereof, said slot (48) being closed when said apparatus (10) is disconnected from said container thereby to seal said second chamber (52) from said first chamber (50), (h) a tubular element (60) slidably mounted within said first chamber (50) for movement toward and away from the first face of said resilient valve disc (46), said tubular element (60) having a first end (64) and a second end opposite said first end (64), (i) a central opening (54) extending through the second end (38) of said connecting piece (14) and providing access to the second end of said tubular element (60) and through said tubular element (60) to the first face of said resilient valve disc (46), (j) said cannula (12) and said second chamber (52) never being exposed to blood under full vascular pressure, (k) whereby, upon connecting said apparatus (10) to said container by inserting said extension of said container into said central opening (54), said extension will engage and depress the second end of said tubular element (60) and force the first end (64) thereof against the first face of said resilient valve disc (46) thereby to deform said resilient valve disc (46) and force open said slot (48), thus placing the first chamber (50) into communication with said second chamber (52) through said open slot (48) and permitting the passage of fluid between said first chamber (50) and said second chamber (52) through said open slot (48), (l) whereby, upon disconnection of said apparatus (10) from said container and removal of said extension from said central opening (54), said resilient valve disc (46) will revert to its undeformed state closing said slot (48) and preventing bacterial contamination from said first chamber (50) reaching said second chamber (52) and said body.

Claim 10

Apparatus (10) for connection to a container having an extension providing a duct for introducing fluid from said container into a body or, selectively, for passing fluid from said body through said duct into said container, said apparatus comprising: (a) a cannula (12) having a first end (24) and a second end (36), (b) an opening (30) in the first end (24) of said cannula (12) to be placed in communication with the interior of said body, (c) a connecting piece (14) having a first end (42) and a second end (38), the first end (42) of said connecting piece (14) being secured to the second end (36) of said cannula (12), (d) a hollow portion within said connecting piece (14), said hollow portion having a first chamber (50) and a second chamber (52), (e) said second chamber (52) communicating with the interior (18) of said cannula (12), (f) a resilient valve disc (46) mounted within said hollow portion of said connecting piece (14) between said first chamber (50) and said second chamber (52), said resilient valve disc (46) having a first face facing said first chamber (50) and a second face opposite said first face and facing said second chamber (52), (g) a slot (48) formed in said resilient valve disc (46) and extending from said first face to said second face thereof, said slot (48) being closed when said apparatus (10) is disconnected from said container thereby to seal said second chamber (52) from said first chamber (50), (h) a tubular element (60) slidably mounted within said first chamber (50) for movement toward and away from the first face of said resilient valve disc (46), said tubular element (60) having a first end (64) and a second end opposite said first end (64), (i) a central opening (54) extending through the second end (38) of said connecting piece (14) and providing access to the second end of said tubular element (60) and through said tubular element (60) to the first face of said resilient valve disc (46), (j) said cannula (12) and said second chamber (52) never being exposed to blood under full vascular pressure, (k) whereby, upon connecting said apparatus (10) to said container by inserting said extension of said container into said central opening (54), said extension will engage and depress the second end of said tubular element (60) and force the first end (64) thereof against the first face of said resilient valve disc (46) thereby to deform said resilient valve disc (46) and force open said slot (48), thus placing the first chamber (50) into communication with said second chamber (52) through said open slot (48) and permitting the passage of fluid between said first chamber (50) and said second chamber (52) through said open slot (48), (l) whereby, upon disconnection of said apparatus (10) from said container and removal of said extension from said central opening (54), said resilient valve disc (46) will revert to its undeformed state closing said slot (48) and preventing bacterial contamination from said first chamber (50) reaching said second chamber (52) and said body.

Claim 11

Apparatus as in claim 8, wherein: (1) the external surface of said tubular element (60) is tapered inwardly adjacent the first end (64) thereof.

Claim 12

Apparatus as in claim 8, wherein: (1) the central opening (54) extending through the second end (38) of said connecting piece (14) is the wide end of a female Luer cone.

Claim 13

Apparatus as in claim 8, wherein: (1) said slot (48) extends along a diameter of said resilient valve disc (46) and stops short of both ends of said diameter.

Claim 14

Apparatus as in claim 8, wherein: (1) the first end (64) of said tubular element (60) is adjacent the first face of said resilient valve disc (46) when said apparatus (10) is disconnected from said container.

Claim 15

Apparatus as in claim 8, wherein: (1) said resilient valve disc (46) is made from elastomeric material.

Claim 16

Port cannula apparatus (10) for connection to a container having an extension providing a duct for introducing fluid from said container into a body through a port implanted in said body and having a sealing septum, said port cannula apparatus comprising: (a) a cannula (12) having a first end (24) and a second end (36), said first end (24) being adapted to pierce said septum in said port thereby placing the interior (18) of said cannula (12) in communication with said port and the interior of said body, (b) a connecting piece (14) having a first end (42) and a second end (38), the first end (42) of said connecting piece (14) being secured to the second end (36) of said cannula (12), (c) a hollow portion within said connecting piece (14), said hollow portion having a first chamber (50) and a second chamber (52), (d) said second chamber (52) communicating with the interior (18) of said cannula (12), (e) a resilient valve disc (46) mounted within said hollow portion of said connecting piece (14) between said first chamber (50) and said second chamber (52), said resilient valve disc (46) having a first face facing said first chamber (50) and a second face opposite said first face and facing said second chamber (52), (f) a slot (48) formed in said resilient valve disc (46) and extending from said first face to said second face thereof, said slot (48) being closed when said port cannula apparatus (10) is disconnected from said container thereby to seal said second chamber (52) from said first chamber (50), (g) a tubular element (60) slidably mounted within said first chamber (50) for movement toward and away from the first face of said resilient valve disc (46), said tubular element (60) having a first end (64) and a second end opposite said first end (64), (h) a central opening (54) extending through the second end (38) of said connecting piece (14) and providing access to the second end of said tubular element (60) and through said tubular element to the first face of said resilient valve disc (46), (i) said cannula (12) and said second chamber (52) never being exposed to blood under full vascular pressure, (j) whereby, upon the first end (24) of said cannula (12) piercing the septum of said port, the interior (18) of said cannula (12) is placed in communication with the interior of said port and the interior of said body, (k) whereby, upon connecting said port cannula apparatus (10) to said container by inserting said extension of said container into said central opening (54), said extension will depress the second end of said tubular element (60) and force the first end (24) thereof against the first face of said resilient valve disc (46) thereby to deform said resilient valve disc (46) and force open said slot (48), placing the first chamber (50) into communication with said second chamber (52) through said open slot (48) and permitting the passage of fluid from said first chamber (50) to said second chamber (52) through said open slot (48), (l) whereby, upon disconnection of said port cannula apparatus (10) from said container and removal of said extension from said central opening (54), said resilient valve disc (46) will revert to its undeformed state closing said slot (48), preventing bacterial contamination from said first chamber (50) reaching said second chamber (52), said port and said body.

Claim 17

Port cannula apparatus (10) for connection to a container having an extension providing a duct for introducing fluid from said container into a body through a port implanted in said body and having a sealing septum, said port cannula apparatus comprising: (a) a cannula (12) having a first end (24) and a second end (36), said first end (24) being adapted to pierce said septum in said port thereby placing the interior (18) of said cannula (12) in communication with said port and the interior of said body, (b) a connecting piece (14) having a first end (42) and a second end (38), the first end (42) of said connecting piece (14) being secured to the second end (36) of said cannula (12), (c) a hollow portion within said connecting piece (14), said hollow portion having a first chamber (50) and a second chamber (52), (d) said second chamber (52) communicating with the interior (18) of said cannula (12), (e) a resilient valve disc (46) mounted within said hollow portion of said connecting piece (14) between said first chamber (50) and said second chamber (52), said resilient valve disc (46) having a first face facing said first chamber (50) and a second face opposite said first face and facing said second chamber (52), (f) a slot (48) formed in said resilient valve disc (46) and extending from said first face to said second face thereof, said slot (48) being closed when said port cannula apparatus (10) is disconnected from said container thereby to seal said second chamber (52) from said first chamber (50), (g) a tubular element (60) slidably mounted within said first chamber (50) for movement toward and away from the first face of said resilient valve disc (46), said tubular element (60) having a first end (64) and a second end opposite said first end (64), (h) a central opening (54) extending through the second end (38) of said connecting piece (14) and providing access to the second end of said tubular element (60) and through said tubular element to the first face of said resilient valve disc (46), (i) said cannula (12) and said second chamber (52) never being exposed to blood under full vascular pressure, (j) whereby, upon the first end (24) of said cannula (12) piercing the septum of said port, the interior (18) of said cannula (12) is placed in communication with the interior of said port and the interior of said body, (k) whereby, upon connecting said port cannula apparatus (10) to said container by inserting said extension of said container into said central opening (54), said extension will depress the second end of said tubular element (60) and force the first end (24) thereof against the first face of said resilient valve disc (46) thereby to deform said resilient valve disc (46) and force open said slot (48), placing the first chamber (50) into communication with said second chamber (52) through said open slot (48) and permitting the passage of fluid from said first chamber (50) to said second chamber (52) through said open slot (48), (l) whereby, upon disconnection of said port cannula apparatus (10) from said container and removal of said extension from said central opening (54), said resilient valve disc (46) will revert to its undeformed state closing said slot (48), preventing bacterial contamination from said first chamber (50) reaching said second chamber (52), said port and said body.

Claim 18

Port cannula apparatus as in claim 14, wherein: (1) the external surface of said tubular element (60) is tapered inwardly adjacent the first end (64) thereof.

Claim 19

Port cannula apparatus as in claim 14, wherein: (1) the central opening (54) extending through the second end (38) of said connecting piece (14) is the wider end of a female Luer cone.

Claim 20

Port cannula apparatus as in claim 14, wherein: (1) said slot (48) extends along a diameter of said resilient valve disc (46) and stops short of both ends of said diameter.

Claim 21

Port cannula apparatus as in claim 14, wherein: (1) the first end (64) of said tubular element (60) is adjacent the first face of said resilient valve disc (46) when said port cannula apparatus (10) is disconnected from said container.

Claim 22

Port cannula apparatus as in claim 14, wherein: (1) said resilient valve disc (46) is elastomeric material.

Claim 23

Port cannula arrangement (10) for punctuating the septum of an internally located port with minimal material damage with a metal cannula (12) which is surface-ground at the distal end (20) and which extends into a connecting piece (14) at its proximal end (36), for the purpose of establishing a fluid connection to a syringe or similar device having a complementary connecting piece adapted to be inserted into the connecting piece (14), characterized as follows: a valve (46) which closes off access to the metal cannula (12) which is never exposed to blood under full vascular pressure in a germ proof manner is located within the connecting piece (14), the geometry of this valve (46) is designed to allow the valve to be opened by the complementary connecting piece on the syringe or similar device when the connecting piece (14) is entered by a section of said complementary connecting piece thereby establishing a fluid connection to said syringe or similar device.

Claim 24

Port cannula arrangement (10) for punctuating the septum of an internally located port with minimal material damage with a metal cannula (12) which is surface-ground at the distal end (20) and which extends into a connecting piece (14) at its proximal end (36), for the purpose of establishing a fluid connection to a syringe or similar device having a complementary connecting piece adapted to be inserted into the connecting piece (14), characterized as follows: a valve (46) which closes off access to the metal cannula (12) which is never exposed to blood under full vascular pressure in a germ proof manner is located within the connecting piece (14), the geometry of this valve (46) is designed to allow the valve to be opened by the complementary connecting piece on the syringe or similar device when the connecting piece (14) is entered by a section of said complementary connecting piece thereby establishing a fluid connection to said syringe or similar device.

Claim 25

Port cannula arrangement (10) for puncturing the septum of an internally located port with minimal material damage with a metal cannula (12) which is surface-ground at the distal end (20), and which proceeds into a connecting piece (14) at its proximal end (36), characterized as follows: a valve (46) which closes off access to the metal cannula (12) which is never exposed to physiological fluids under full pressure of said physiological fluids in a body in a germ proof manner is located within the connecting piece (14); the geometry of this valve is designed to allow the valve to be opened when the connecting piece is entered by a section of a complementary connecting piece for the purpose of establishing a connection to a syringe or similar device.

Claim 26

Port cannula arrangement (10) for puncturing the septum of an internally located port with minimal material damage with a metal cannula (12) which is surface-ground at the distal end (20), and which proceeds into a connecting piece (14) at its proximal end (36), characterized as follows: a valve (46) which closes off access to the metal cannula (12) which is never exposed to physiological fluids under full pressure of said physiological fluids in a body in a germ proof manner is located within the connecting piece (14); the geometry of this valve is designed to allow the valve to be opened when the connecting piece is entered by a section of a complementary connecting piece for the purpose of establishing a connection to a syringe or similar device.

Claim 27

Apparatus (10) for connection to a container having an extension providing a duct for introducing fluid from said container into a body or, selectively, for passing fluid from said body through said duct into said container, said apparatus comprising: (a) a cannula (12) having a first end (24) and a second end (36), (b) an opening (30) in the first end (24) of said cannula (12) to be placed in communication with the interior of said body, (c) a connecting piece (14) having a first end (42) and a second end (38), the first end (42) of said connecting piece (14) being secured to the second end (36) of said cannula (12), (d) a hollow portion within said connecting piece (14), said hollow portion having a first chamber (50) and a second chamber (52), (e) said second chamber (52) communicating with the interior (18) of said cannula (12), (f) a resilient valve disc (46) mounted within said hollow portion of said connecting piece (14) between said first chamber (50) and said second chamber (52), said resilient valve disc (46) having a first face facing said first chamber (50) and a second face opposite said first face and facing said second chamber (52), (g) a slot (48) formed in said resilient valve disc (46) and extending from said first face to said second face thereof, said slot (48) being closed when said apparatus (10) is disconnected from said container thereby to seal said second chamber (52) from said first chamber (50), (h) a tubular element (60) slidably mounted within said first chamber (50) for movement toward and away from the first face of said resilient valve disc (46), said tubular element (60) having a first end (64) and a second end opposite said first end (64), (i) a central opening (54) extending through the second end (38) of said connecting piece (14) and providing access to the second end of said tubular element (60) and through said tubular element (60) to the first face of said resilient valve disc (46), (j) said cannula (12) and said second chamber (52) never being exposed to physiological fluids under full pressure of said physiological fluids in said body, (k) whereby, upon connecting said apparatus (10) to said container by inserting said extension of said container into said central opening (54), said extension will engage and depress the second end of said tubular element (60) and force the first end (64) thereof against the first face of said resilient valve disc (46) thereby to deform said resilient valve disc (46) and force open said slot (48), thus placing the first chamber (50) into communication with said second chamber (52) through said open slot (48) and permitting the passage of fluid between said first chamber (50) and said second chamber (52) through said open slot (48), (l) whereby, upon disconnection of said apparatus (10) from said container and removal of said extension from said central opening (54), said resilient valve disc (46) will revert to its undeformed state closing said slot (48) and preventing bacterial contamination from said first chamber (50) reaching said second chamber (52) and said body.

Claim 28

Apparatus (10) for connection to a container having an extension providing a duct for introducing fluid from said container into a body or, selectively, for passing fluid from said body through said duct into said container, said apparatus comprising: (a) a cannula (12) having a first end (24) and a second end (36), (b) an opening (30) in the first end (24) of said cannula (12) to be placed in communication with the interior of said body, (c) a connecting piece (14) having a first end (42) and a second end (38), the first end (42) of said connecting piece (14) being secured to the second end (36) of said cannula (12), (d) a hollow portion within said connecting piece (14), said hollow portion having a first chamber (50) and a second chamber (52), (e) said second chamber (52) communicating with the interior (18) of said cannula (12), (f) a resilient valve disc (46) mounted within said hollow portion of said connecting piece (14) between said first chamber (50) and said second chamber (52), said resilient valve disc (46) having a first face facing said first chamber (50) and a second face opposite said first face and facing said second chamber (52), (g) a slot (48) formed in said resilient valve disc (46) and extending from said first face to said second face thereof, said slot (48) being closed when said apparatus (10) is disconnected from said container thereby to seal said second chamber (52) from said first chamber (50), (h) a tubular element (60) slidably mounted within said first chamber (50) for movement toward and away from the first face of said resilient valve disc (46), said tubular element (60) having a first end (64) and a second end opposite said first end (64), (i) a central opening (54) extending through the second end (38) of said connecting piece (14) and providing access to the second end of said tubular element (60) and through said tubular element (60) to the first face of said resilient valve disc (46), (j) said cannula (12) and said second chamber (52) never being exposed to physiological fluids under full pressure of said physiological fluids in said body, (k) whereby, upon connecting said apparatus (10) to said container by inserting said extension of said container into said central opening (54), said extension will engage and depress the second end of said tubular element (60) and force the first end (64) thereof against the first face of said resilient valve disc (46) thereby to deform said resilient valve disc (46) and force open said slot (48), thus placing the first chamber (50) into communication with said second chamber (52) through said open slot (48) and permitting the passage of fluid between said first chamber (50) and said second chamber (52) through said open slot (48), (l) whereby, upon disconnection of said apparatus (10) from said container and removal of said extension from said central opening (54), said resilient valve disc (46) will revert to its undeformed state closing said slot (48) and preventing bacterial contamination from said first chamber (50) reaching said second chamber (52) and said body.

Claim 29

Port cannula apparatus (10) for connection to a container having an extension providing a duct for introducing fluid from said container into a body through a port implanted in said body and having a sealing septum, said port cannula apparatus comprising: (a) a cannula (12) having a first end (24) and a second end (36), said first end (24) being adapted to pierce said septum in said port thereby placing the interior (18) of said cannula (12) in communication with said port and the interior of said body, (b) a connecting piece (14) having a first end (42) and a second end (38), the first end (42) of said connecting piece (14) being secured to the second end (36) of said cannula (12), (c) a hollow portion within said connecting piece (14), said hollow portion having a first chamber (50) and a second chamber (52), (d) said second chamber (52) communicating with the interior (18) of said cannula (12), (e) a resilient valve disc (46) mounted within said hollow portion of said connecting piece (14) between said first chamber (50) and said second chamber (52), said resilient valve disc (46) having a first face facing said first chamber (50) and a second face opposite said first face and facing said second chamber (52), (f) a slot (48) formed in said resilient valve disc (46) and extending from said first face to said second face thereof, said slot (48) being closed when said port cannula apparatus (10) is disconnected from said container thereby to seal said second chamber (52) from said first chamber (50), (g) a tubular element (60) slidably mounted within said first chamber (50) for movement toward and away from the first face of said resilient valve disc (46), said tubular element (60) having a first end (64) and a second end opposite said first end (64), (h) a central opening (54) extending through the second end (38) of said connecting piece (14) and providing access to the second end of said tubular element (60) and through said tubular element to the first face of said resilient valve disc (46), (i) said cannula (12) and said second chamber (52) never being exposed to physiological fluids under full pressure of said physiological fluids in said body, (j) whereby, upon the first end (24) of said cannula (12) piercing the septum of said port, the interior (18) of said cannula (12) is placed in communication with the interior of said port and the interior of said body, (k) whereby, upon connecting said port cannula apparatus (10) to said container by inserting said extension of said container into said central opening (54), said extension will depress the second end of said tubular element (60) and force the first end (24) thereof against the first face of said resilient valve disc (46) thereby to deform said resilient valve disc (46) and force open said slot (48), placing the first chamber (50) into communication with said second chamber (52) through said open slot (48) and permitting the passage of fluid from said first chamber (50) to said second chamber (52) through said open slot (48), (l) whereby, upon disconnection of said port cannula apparatus (10) from said container and removal of said extension from said central opening (54), said resilient valve disc (46) will revert to its undeformed state closing said slot (48), preventing bacterial contamination from said first chamber (50) reaching said second chamber (52), said port and said body.

Claim 30

Port cannula apparatus (10) for connection to a container having an extension providing a duct for introducing fluid from said container into a body through a port implanted in said body and having a sealing septum, said port cannula apparatus comprising: (a) a cannula (12) having a first end (24) and a second end (36), said first end (24) being adapted to pierce said septum in said port thereby placing the interior (18) of said cannula (12) in communication with said port and the interior of said body, (b) a connecting piece (14) having a first end (42) and a second end (38), the first end (42) of said connecting piece (14) being secured to the second end (36) of said cannula (12), (c) a hollow portion within said connecting piece (14), said hollow portion having a first chamber (50) and a second chamber (52), (d) said second chamber (52) communicating with the interior (18) of said cannula (12), (e) a resilient valve disc (46) mounted within said hollow portion of said connecting piece (14) between said first chamber (50) and said second chamber (52), said resilient valve disc (46) having a first face facing said first chamber (50) and a second face opposite said first face and facing said second chamber (52), (f) a slot (48) formed in said resilient valve disc (46) and extending from said first face to said second face thereof, said slot (48) being closed when said port cannula apparatus (10) is disconnected from said container thereby to seal said second chamber (52) from said first chamber (50), (g) a tubular element (60) slidably mounted within said first chamber (50) for movement toward and away from the first face of said resilient valve disc (46), said tubular element (60) having a first end (64) and a second end opposite said first end (64), (h) a central opening (54) extending through the second end (38) of said connecting piece (14) and providing access to the second end of said tubular element (60) and through said tubular element to the first face of said resilient valve disc (46), (i) said cannula (12) and said second chamber (52) never being exposed to physiological fluids under full pressure of said physiological fluids in said body, (j) whereby, upon the first end (24) of said cannula (12) piercing the septum of said port, the interior (18) of said cannula (12) is placed in communication with the interior of said port and the interior of said body, (k) whereby, upon connecting said port cannula apparatus (10) to said container by inserting said extension of said container into said central opening (54), said extension will depress the second end of said tubular element (60) and force the first end (24) thereof against the first face of said resilient valve disc (46) thereby to deform said resilient valve disc (46) and force open said slot (48), placing the first chamber (50) into communication with said second chamber (52) through said open slot (48) and permitting the passage of fluid from said first chamber (50) to said second chamber (52) through said open slot (48), (l) whereby, upon disconnection of said port cannula apparatus (10) from said container and removal of said extension from said central opening (54), said resilient valve disc (46) will revert to its undeformed state closing said slot (48), preventing bacterial contamination from said first chamber (50) reaching said second chamber (52), said port and said body.

Claim 31

Port cannula arrangement (10) for punctuating the septum of an internally located port with minimal material damage with a metal cannula (12) which is surface-ground at the distal end (20) and which extends into a connecting piece (14) at its proximal end (36), for the purpose of establishing a fluid connection to a syringe or similar device having a complementary connecting piece adapted to be inserted into the connecting piece (14), characterized as follows: a valve (46) which closes off access to the metal cannula (12) which is never exposed to physiological fluids under full pressure of said physiological fluids in said body in a germ proof manner is located within the connecting piece (14), the geometry of this valve (46) is designed to allow the valve to be opened by the complementary connecting piece on the syringe or similar device when the connecting piece (14) is entered by a section of said complementary connecting piece thereby establishing a fluid connection to said syringe or similar device.

Claim 32

Port cannula arrangement (10) for punctuating the septum of an internally located port with minimal material damage with a metal cannula (12) which is surface-ground at the distal end (20) and which extends into a connecting piece (14) at its proximal end (36), for the purpose of establishing a fluid connection to a syringe or similar device having a complementary connecting piece adapted to be inserted into the connecting piece (14), characterized as follows: a valve (46) which closes off access to the metal cannula (12) which is never exposed to physiological fluids under full pressure of said physiological fluids in said body in a germ proof manner is located within the connecting piece (14), the geometry of this valve (46) is designed to allow the valve to be opened by the complementary connecting piece on the syringe or similar device when the connecting piece (14) is entered by a section of said complementary connecting piece thereby establishing a fluid connection to said syringe or similar device.