Cannula introducers
First Claim
1. A cannular introducer device for providing a cut in a blood vessel wall and inserting a cannula into such cut comprising,a handle,a elongated cutting rod terminating at its distal end in a cutting blade means,said rod extending distally from said handle and being carried thereby for relative proximal and distal movement,a tubular rod housing carried by said handle and telescopically receiving at least the distal portion of said cutting rod,said cutting rod having a cutting position wherein the cutting blade means projects distally from said rod housing and a non-cutting position wherein said cutting blade means is shrouded by the distal end of said rod housing,an elongated hollow cannula,cannula supporting means on said handle for releasably supporting said cannula thereon with said cannula extending distally from said supporting means and said cannula telescopically receiving said rod housing and being supported by at least a portion of said tubular rod housing,trigger means carried by said housing and having a first end graspable by the operator of the device for actuating the same and a second end having operating means thereon,operated means carried by said handle and being connected to the proximal end of said cutting rod,said operated means having a first position wherein it maintains said cutting rod in its non-cutting position and having a second position wherein it maintains said cutting rod in its cutting position,first spring means biasing said operated means towards its first position,said operating means on said trigger means being operatively connected to said operated means,said trigger means having a first position wherein the operating means thereon maintains said operated means in the latter'"'"'s first position,said trigger means being moveable to a second position wherein the operating means thereon moves said operated means to its second position and said trigger means having a third position wherein said operated means is allowed to be returned by said first spring means to its first position,and second spring means biasing said trigger means towards its first position.
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Accused Products
Abstract
A cannula introducer device for providing a cut in a blood vessel wall and inserting a cannula into such cut. The device includes a rod housing carried by a pistol-shaped handle. Telescoped within the rod housing is a blade rod terminating at its distal end in a knife blade and extending from the proximal end of the rod housing to be secured to a reverse hammer-cam follower which is biased in a direction to move the blade rod proximately into the rod housing. Surrounding the rod housing and releasably carried by the handle is a cannula, the distal end being substantially co-extensive with the rod housing. A first trigger in the handle engages the reverse hammer and upon proximal movement of the trigger moves the blade out of the distal end of the rod housing and cannula where the operator can use the blade to cut an opening in the blood vessel. A spring loaded stop engages the trigger at its blade extended position. Further proximal movement of the trigger overcomes the stop and allows the reverse hammer to be biased to move the blade rod proximally into the confines of the rod housing. The entire device is then advanced distally to insert the distal end of the cannula in the cut in the vessel wall, and the cannula is then withdrawn from the handle and supporting blade housing. In a second embodiment, a second trigger is mounted on the handle and is spring loaded so that its upper end moves proximally. A rod pivotally secured to the upper end of the trigger extends distally into a notch at the proximal end of the cannula. Upon activation of the second trigger the rod pushes the cannula in a distal direction relative to the handle.
94 Citations
13 Claims
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1. A cannular introducer device for providing a cut in a blood vessel wall and inserting a cannula into such cut comprising,
a handle, a elongated cutting rod terminating at its distal end in a cutting blade means, said rod extending distally from said handle and being carried thereby for relative proximal and distal movement, a tubular rod housing carried by said handle and telescopically receiving at least the distal portion of said cutting rod, said cutting rod having a cutting position wherein the cutting blade means projects distally from said rod housing and a non-cutting position wherein said cutting blade means is shrouded by the distal end of said rod housing, an elongated hollow cannula, cannula supporting means on said handle for releasably supporting said cannula thereon with said cannula extending distally from said supporting means and said cannula telescopically receiving said rod housing and being supported by at least a portion of said tubular rod housing, trigger means carried by said housing and having a first end graspable by the operator of the device for actuating the same and a second end having operating means thereon, operated means carried by said handle and being connected to the proximal end of said cutting rod, said operated means having a first position wherein it maintains said cutting rod in its non-cutting position and having a second position wherein it maintains said cutting rod in its cutting position, first spring means biasing said operated means towards its first position, said operating means on said trigger means being operatively connected to said operated means, said trigger means having a first position wherein the operating means thereon maintains said operated means in the latter'"'"'s first position, said trigger means being moveable to a second position wherein the operating means thereon moves said operated means to its second position and said trigger means having a third position wherein said operated means is allowed to be returned by said first spring means to its first position, and second spring means biasing said trigger means towards its first position.
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8. A cannula introducer device for providing a cut in a blood vessel wall and inserting a cannula into such cut, comprising,
a handle having a cavity therein, an elongated cutting rod having its proximal end disposed in said cavity and terminating at its distal end in a cutting blade, said rod extending distally from said handle and being carried thereby for relative proximal and distal movement, a tubular rod housing carried by said handle and telescopically receiving the portion of said cutting rod disposed distally of said handle, said cutting rod having a cutting position wherein said cutting blade projects distally from said rod housing and a non-cutting position wherein said cutting blade is shrouded by the distal end of said rod housing, an elongated cannula, cannula supporting means on said handle for releasably supporting said cannula thereon with said cannula extending distally from said supporting means and said cannula telescopically receiving said rod housing and being supported by at least a portion of said tubular rod housing, trigger means carried by said housing and having a first end graspable by the operator of the device contemporaneously with the operator'"'"'s grasping the handle of the device for actuating said trigger means and said trigger means having a second end disposed in the cavity in said handle, said second end of said trigger means having a cam surface thereon, a reverse hammer pivotally mounted to said handle within the cavity therein, said hammer having a first end and second end with said first end being connected to the proximal end of said cutting rod within said cavity and said second end being a cam follower, said reverse hammer having a first position wherein it maintains said cutting rod in a non-cutting position and having a second position wherein it maintains said cutting rod in its cutting position, first spring means biasing said reverse hammer towards its first position, said cam surface of said trigger means being operatively engageable with said cam follower on said reverse hammer, said trigger means having a first position wherein said cam surface maintains said reverse hammer in said latter'"'"'s first position, said trigger means being movable to a second position wherein said cam surface moves said reverse hammer to its second position and said trigger means having a third position wherein said cam surface does not engage said cam follower and said reverse hammer is allowed to be returned by said first spring means to its first position, and second spring means biasing said trigger means towards its first position.
Specification