Device for subcutaneous accessibility
First Claim
1. In an access device for subcutaneous access for transfer of fluid into and/or out of a human or animal body and defining an internal passage therein and having a device entrance for access at one end by a cannula passing through the skin and at the other end by an implanted conduit such as a catheter, the improvement therein comprising:
- (a) locking structure within the device adjacent the internal passage and any cannula therein and restrained within the device,(b) means defining a shell structure surrounding the locking structure and having an internal surface adjacent to the locking structure,(c) means defining at least one essentially rigid blade within the shell spanning the gap between the surface of a cannula inserted in the passage and said internal shell surface, and(d) said internal shell surface being tapered toward the device entrance so that the beginning of inadvertent cannula withdrawal motion produces an increase in locking force against the at least one blade that in turn restrains cannula axial movement,the foregoing structure being constructed and arranged so that twisting the cannula pushes each blade from its locking alignment to an unlocking alignment to allow easy cannula withdrawal.
4 Assignments
0 Petitions
Accused Products
Abstract
Hemodialysis access and lock device (10) and system, the device comprising an improved lock (32) formed of a resilient plug (34) surrounding an inserted needle cannula (NC) and having radial blades (40) with a tapered outer edge (42) locking to a corresponding tapered surface (44) of a surrounding shell (12) and an internal passage sealed by a duck-bill valve and a strain relief at a catheter and the system comprising one or more of such devices and corresponding hub structures (100) connectable to external fluid conduits and providing control of the needle cannula and an internal obturator (OB) associated with it.
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Citations
26 Claims
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1. In an access device for subcutaneous access for transfer of fluid into and/or out of a human or animal body and defining an internal passage therein and having a device entrance for access at one end by a cannula passing through the skin and at the other end by an implanted conduit such as a catheter, the improvement therein comprising:
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(a) locking structure within the device adjacent the internal passage and any cannula therein and restrained within the device, (b) means defining a shell structure surrounding the locking structure and having an internal surface adjacent to the locking structure, (c) means defining at least one essentially rigid blade within the shell spanning the gap between the surface of a cannula inserted in the passage and said internal shell surface, and (d) said internal shell surface being tapered toward the device entrance so that the beginning of inadvertent cannula withdrawal motion produces an increase in locking force against the at least one blade that in turn restrains cannula axial movement, the foregoing structure being constructed and arranged so that twisting the cannula pushes each blade from its locking alignment to an unlocking alignment to allow easy cannula withdrawal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. Device in accordance with 6, or 7 wherein cantilever wire springs are provided to urge the flaps into closing position.
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11. An access system for transfer of fluid into and/or out of a human or animal body, comprising:
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(a) at least one subcutaneously implantable access and lock device with an internal passage, the device being constructed and arranged with an internal body fluid conduit at one end of its internal passage and means to receive a cannula passing through the skin of said body at its other internal passage end and relatively lock the cannula therein or unlock it, (b) means defining needle assembly with a thin wall sheath or cannula and an internal obturator movable axially therein, (c) means defining a hub structure for use outside the body for establishing a fluid flow moving between an external conduit and said cannula for providing a passage for controlled positioning of said obturator, (d) the cannula and obturator being insertable into the access and lock device together and removable separately, whereby the assembled cannula and obturator can be passed through the skin from outside the body to reach the internal passage of the lock device and lock the cannula therein, and wherein the obturator can then be removed, and means for unlocking and removal of the cannula. - View Dependent Claims (12, 13, 14, 15, 16)
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17. In an access device for subcutaneous access for transfer of fluid into and/or out of a human or animal body and defining an internal passage therein for access at one end by a cannula passing through the skin and at the other end by an implanted conduit such as a catheter, the improvement therein comprising:
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(a) a sealing structure within the device adjacent the internal passage and any cannula therein with a movable portion of the sealing structure in a retracted position when a cannula is in the passage; (b) the movable portion being constructed and arranged to automatically block the passage as the cannula is withdrawn from the passage wherein the movable portion of the seal structure is flexible and in the form of flexible multiple flaps, said multiple flaps having two flaps to form a duckbill seal, and a small pocket is provided for each flap when pushed aside by the cannula, said pockets being the only regions of the seal for fluid collection when the flaps block the internal passage; (c) the sealing structure providing substantially no volume unswept by flow through said access device internal passage other than a storage volume for the retracted movable portion that is filled by said portion upon retraction to thereby expel fluid, collected therein during sealing, back into the flow passage as the cannula is reinserted. - View Dependent Claims (18)
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- 19. In an access device for subcutaneous access for transfer of fluid into and/or out of a human or animal body and defining an internal passage therein for access at one end by a cannula passing through the skin and at the other end by a proximal end of an implanted conduit such as a catheter, and wherein strain relief is provided, said strain relief comprising a web enclosure that is capable of surrounding the access device and the proximal end of the catheter to avoid catheter distortion while allowing the access device to pivot under the skin.
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23. In an access device for an assembly to leave a streamlined flow passage from an external flow passage through a structure, a cannula having a distal end, an access device passage and a catheter subcutaneous access for transfer of fluid into and/or out of a human or animal body and defining an internal passage therein for access at one end by a cannula passing through the skin and at the other end by an implanted conduit such as a catheter, the improvement therein and further comprising:
a needle assembly comprising a thin walled cannula shell and an internal obturator rod, the rod having a distal end that protrudes out of the cannula distal end so that the assembly can penetrate the skin, guide an access end of the device and pass through the passage without scoring or otherwise marring passage defining walls, wherein said protruding end is of generally conical form, has a distal endmost section and next-to-endmost section (collar), the latter blending smoothly into a needle and the former providing the principal skin cutting portion in a way that penetrates skin without making long tears therein, wherein the protruding end is faceted with a first series of facets at said distal end and a second series of facets at the collar of greater number than the first series. - View Dependent Claims (24, 25, 26)
Specification