A luer receiving medical valve for the sterile transfer of fluid from a luer-tapered male end having a surrounding female luer lock threaded end. The luer receiver includes a housing having an inlet and an outlet and a lumen extending from the inlet to the outlet. An elastomeric sealing member occludes the inlet and has a slit extending through it. In a preferred embodiment, a support is provided adjacent the housing inlet and adjacent the sealing member. The support includes opposing posts separated by slots, the slots permitting expansion of the sealing member when the male luer is inserted into the slit.
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1. A medical luer receiver for the sterile transfer of fluid from a luer-tapered male end having a surrounding female luer lock threaded end, comprising:
a. a housing having an inlet and an outlet and a lumen extending from said inlet to said outlet; b. an elastomeric sealing member defining a longitudinal axis and having a central portion and occluding said inlet, said sealing member having an outerface; c. a slit extending through said sealing member, said slit defining a long transverse axis transverse to said longitudinal axis, and further having a length along said long transverse axis sufficient to receive said male end into said slit; d. a support portion defining a longitudinal axis, said support portion being positioned adjacent said inlet and adjacent said sealing member; e. said support portion including opposing posts and slots defined therebetween, said slots functioning to allow expansion of said sealing member when said male end is inserted into said slit.
25. A medical connection system comprising:
a. a first terminal including a luer lock connector, said connector having a cylindrical female end and a blunt cannula centrally disposed within said end, b. a second terminal including a housing having an inlet and an outlet and defining a housing portion adjacent said inlet, said portion including at least one cutout, said housing portion being sized to be received into said female end of said first terminal, c. an elastomeric sealing member disposed within said inlet of said second terminal, said member having an outer face and being mounted with said second terminal such that said outer face is adjacent said inlet, said sealing member having a perforation extending from said outer face through said sealing member for receiving said cannula, said sealing member, and said cutout being configured such that said sealing member can expand into said cutout when said cannula is inserted into said perforation, said housing portion with said sealing member being sized so as to be received into said female end when said cannula is received into said perforation and said sealing member has expanded into said cutout.
12. A medical connection terminal for secure connection of a luer lock connector having a female threaded end, said connector having a cannula centrally disposed within said female end, the terminal comprising:
a. a rigid housing defining an axis and having a proximal portion and a distal portion, said housing having an inlet adjacent said proximal portion and an outlet adjacent said distal portion, said proximal portion having at least one cutout adjacent said inlet, b. an elastomeric sealing member mounted within said inlet, said member having an outer face and a sealed perforation extending through said member from adjacent said outer face toward said outlet, said perforation being sized to receive said cannula, said member expanding adjacent said outer face to define an expanded sealing member when said cannula is received within said perforation, at least a portion of said expanded member expanding into said cutout, said expanded member and said proximal portion of said housing being sized to be threadably received within said female end so that when said cannula is inserted into said perforation, said female end can be threadably locked over said proximal portion of said housing.
26. A connection system for connecting a first tubing system with a second tubing system, said system including:
a. a female terminal comprising a cylindrical female luer lock connector defining interior threaded walls and having a cannula centrally disposed within said connector, b. a male terminal comprising a rigid housing defining an axis and having a proximal portion including an inlet and a distal portion including an outlet, said proximal portion having opposing cantilevered bars and further having opposing slots intermediate said bars, said bars including at least one flange, said bars being sized to be received within said female luer lock connector such that said flange can engage said interior threaded walls, c. an elastomeric sealing member mounted within said inlet and having a closed central perforation through said member, said perforation being sized to receive said cannula, at least a portion of said sealing member deflecting upon receipt of said cannula into said perforation to define at least one deflected sealing member portion, said sealing member, said bars, and said cutouts being sized and configured so that said bars and said sealing member can be received into said female luer lock connector when said cannula is advanced into said perforation so that said female luer lock connector may be threadably locked about said proximal portion when said centrally positioned cannula is received within said perforation.
4. A medical connection system for the sterile transfer of fluid, comprising:
a. a luer-lock connector including an open female cylindrical end, said end defining an interior threaded wall, said connector further including a cannula centrally positioned within said cylindrical female end, said wall and said cannula defining a partially enclosed narrow tubular space intermediate said cannula and said wall, b. a connection terminal including a housing having an inlet and an outlet, said housing adjacent said inlet being sized to be received within said tubular space, c. an elastomeric sealing member mounted within said inlet, said member defining a longitudinal axis, said member further defining a proximal end portion adjacent said inlet, said proximal end portion including an outer face, d. a perforation extending through said sealing member, at least a portion of said perforation being capable of receiving at least a portion of said cannula by penetration of said cannula into said perforation, said cannula upon said penetration displacing at least a portion of said sealing member transverse to said axis to define a displaced member, e. said housing having at least one cutout adjacent said inlet, said cutout functioning to receive at least a portion of said displaced member into said tubular space when said cannula is received into said perforation so that said housing adjacent said inlet and at least said proximal end portion of said sealing member can be received into said female cylindrical end when said cannula is received into said perforation.
20. A medical luer lock connection system comprising:
a. a male connection terminal defining a rigid housing having a longitudinal axis, an inlet, an outlet, and a lumen extending along said axis, and an elastomeric sealing member mounted within said inlet, said elastomeric sealing member comprising an elastomeric upper portion and a vertically extending elastomeric lower portion integral with said upper portion, said elastomeric lower portion projection downwardly from said elastomeric upper portion along said longitudinal axis of said housing, said lumen providing an open flow path from said elastomeric lower portion through said housing to said outlet, b. a cylindrical female connection terminal including cylindrical interior walls, said interior walls including a locking member for locking onto said rigid housing, said female terminal having a centrally disposed blunt cannula projecting therein, said female terminal defining a narrow tubular open space intermediate said central cannula and said interior walls, said female terminal being sized to be received over said housing adjacent said inlet, c. a sealed perforation through said elastomeric sealing member for receiving said cannula, said perforation comprising a slit, said slit having a first length, transverse to said longitudinal axis, that is sufficient to receive said central cannula into said slit, said slit having a second length generally along said longitudinal axis through said upper portion, and through said vertically extending lower portion, to substantially divide said lower portion into opposing lateral elastomeric wall portions, said wall portions contacting each other to seal said slit, d. said housing including a proximal portion adjacent said inlet, said proximal portion including oppositely disposed slots, said proximal portion of said housing further being sized to be received within said tubular open space of said female connection terminal, said opposing lateral elastomeric wall portions being positioned adjacent said oppositely disposed slots such that said opposing lateral elastomeric wall portions define inner peripheries of said slots, e. said blunt cannula displacing at least a portion of said elastomeric sealing member into said slots when said cannula is received into said perforation to define a displaced member, said slots thus functioning to receive at least a portion of said displaced member, f. said proximal portion of said housing, and at least a portion of said displaced member within said slots being received into said narrow space when said cannula is received into said perforation and said female connection terminal is locked onto said housing of said male connection terminal.
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This is a continuation-in-part of application Ser. No. #08/248,646, filed May 25, 1994 (the disclosure of which is hereby incorporated by reference as if completely disclosed herein). This invention relates to the safe and sterile transfer of medical fluid, in particular intravenous fluid and to the sampling of blood as from indwelling arterial and venous catheters and the like. The invention particularly relates to the administration of intravenous fluid or pharmaceuticals to a patient. The background and: problems associated with fluid and drug administration and with blood sampling are extensively discussed in my U.S. Pat. No. 4,838,855, Blood Aspiration Assembly and Method, issued Jun. 13, 1990; U.S. Pat. No. 5,178,607, Blood Aspiration Assembly Septum and Blunt Needle Aspirator, issued Jan. 12, 1993; U.S. Pat. No. 5,137,524, Universal Intravenous Connector with Dual Catches, issued Aug. 11, 1992; U.S. Pat. No. 4,946,445, Intravenous Line Coupling Device, issued Aug. 7, 1990; U.S. Pat. No. 5,215,537, Septum for a Blunt Cannula, issued Jun. 1, 1993; and U.S. Pat. No. 5,167,643, Needle Protection Station, issued Dec. 1, 1992 (the disclosure of each of these patents is hereby incorporated by reference as if completely disclosed herein). These patents provide additional background for the present invention.
The risk of needlestick injury and the expense associated with accessory cannulae, whether blunt or sharp, are well known. Conventional intravenous tubing systems utilize tapering luer male cannula connectors, often within an associated surrounding threadable member defining a luer-lock connector commonly used for achieving tight, sustained connections. A bare luer taper cannula without the associated threadable member is commonly called a luer slip connector and is widely utilized for brief prn injections. Both of these luer systems are in wide use throughout conventional hospital systems and it would be preferable to develop a connecting valve system which receives and is activated by conventional luer slip tapers or luer lock tapers so that incorporation into existing hospital systems is rapid and associated with minimal cost. It would be advantageous for such systems to avoid deadspace so that the surface could be easily wiped with antiseptic to avoid the need for capping after each use. Furthermore, the elimination of deadspace allows for the aspiration of blood through such systems without the collection of blood within the deadspace. Another important feature of such systems is the minimization of "kickback"--that is, it is important that the luer slip tip or luer lock systems, when not tightly locked, do not kickback out of the valve, thereby producing the potential for a spurt of blood or fluid into the environment and potential contamination of the operator.
The prior art includes several luer-receiving valves which do not have substantial deadspace. U.S. Pat. No. 5,201,725 shows a valve which utilizes an elastomeric member which opens by force induced by a threadable member over the elastomeric septum piston. Such a system will not work with a conventional luer lock system since the role taper extends centrally adjacent the luer lock threading member and therefore, it would not be possible to compress the septum piston within the luer-lock threads in such a system without inserting the male member itself into the septran piston. The background discussed in the aforementioned patent provides additional background for the present invention.
A device, designated the CLAVE™, for an injection port marketed by McGaw, is included in the Prior Art. This device utilizes a cannula surrounded by a septum piston. The septum piston is compressed by the luer taper, thereby allowing the needle and its associated bore to enter the bore of the luer taper, thereby opening fluid communication. However, such systems would be expected to be associated with substantial kickback when used with a luer slip system since the septum piston must be relatively resilient to prevent leakage associated with higher fluid pressures within the cannula. Further, tile requirement of a spike or cannula within the bore of the valve results in considerable increase in expense associated with complex insert molding of the device. It is, therefore, preferable to develop a more simplified valve system which can receive a luer taper cannula and which eliminates the need for complex insert molding to minimize the potential for kickback and the potential for trapped fluid or blood while still providing a deadspace-free surface which can be easily wiped with antiseptic. Such a device also will not receive a blunt cannulae and, therefore, may be difficult to implement with conventional drug delivery systems.
In general, the present invention comprises a housing including a main conduit having a main bore and further having a branch extending away from the main conduit and including a secondary bore extending through the branch in fluid communication with the main conduit. The secondary bore may be aligned directly with the main conduit or may branch from the main conduit. The main conduit may, for example, comprise a catheter or may be a primary intravenous tubing system or arterial line. The secondary bore defines a longitudinal axis. An elastomeric septum piston is disposed within the secondary bore and at least a portion of the elastomeric septum piston is moveable by either compression or by longitudinal advancement along the secondary bore toward the main bore. In one preferred embodiment, the septum piston is cylindrical and includes a centrally positional slit extending along the longitudinal axis of the cylindrical septum piston. The cylinder includes a proximal end and a distal end. The proximal end preferably extends to a position adjacent the proximal end of the secondary bore so that the surface of the proximal end of the septum piston is easily accessible adjacent the proximal end of the branch and therefore can be easily wiped with antiseptic. This is an important feature since it eliminates the need for capping after blood aspiration or drug injection. The bore of the secondary branch preferably includes two opposing projecting members along a distal portion of the bore which effectively narrow the diameter of the bore along at least a portion of one longitudinal axis. In the preferred embodiment, the central slit through the septum piston defines a longitudinal axis transverse to the longitudinal axis of the septum piston. With this embodiment, the longitudinal plane of the narrowed distal portion of the secondary bore is aligned with the longitudinal axis of the slit through the elastomeric septum piston. Furthermore, the elastomeric septum piston is sized to be transversely compressed by the projecting distal portions of the secondary bore. Since the slit is aligned with the projecting portions, transverse compression of the septum piston occurs along an axis which corresponds with the longitudinal axis of the slit so that when the elastomeric member is pushed from a proximal position into a distal position, the elastomeric member is transversely compressed by the projecting portions along the distal secondary bore, the compression causing the formerly tightly-closed slit to shorten and thereby open, allowing fluid to pass through a nascent flow channel formed by the shortened slit through the elastomeric septum piston. When the septum piston retracts away from the distal portion back into the proximal portion, the slit returns to its tightly closed position, thereby occluding further fluid communication through the septum piston.
In the preferred embodiment, the projecting portions progressively lengthen to define a progressively decreasing distance between the projecting members so that the projecting members are closer to one another adjacent the main bore than adjacent the proximal cylindrical portion of the secondary bore. This effectuates a progressive enlargement of the opening through slit of the elastomeric septum piston when the elastomeric septum piston is fully advanced into the proximal portion of the secondary bore. Furthermore, after removal of the luer, as the elastomeric septum piston retracts away from the distal compressing portion toward the proximal portion, the slit progressively closes from its proximal extent toward its distal extent, thereby expressing fluid toward the main bore rather than toward the proximal opening of the secondary bore. This reduces the chance of blood or fluid refluxing out of the septum piston into the environment or into the secondary bore when luer taper cannula is withdrawn from the secondary bore.
The septum piston can include a proximal extension which can be cylindrical and can be integral with the septum piston and can be formed of like elastomeric material such as silicone or latex rubber. The septum piston and the extension can be formed together as a single integral flexible conduit having an interior sterile enclosed flow path. In one embodiment, the proximal end of the conduit is closed to comprise the septum piston having a sealed perforation, as described above;the distal end of the conduit is opened and engages a seat which can provide a seal. The conduit therefore provides an enclosed flow path from the luer tip through the conduit when the closed end of the conduit is distorted such that the perforation is open. The distal open end of the conduit can be intussuscepted over a tube which can be rigid so as to provide a fixed sealed seat. Alternatively, the seat can be provided by a slot formed within an outer housing. An advantage of the tubular seat is that it provides easy mounting of the tubular flexible conduit during manufacture and further can provide an effective seal against contamination of the interior flow path within the flexible conduit during operation. It is considered potentially advantageous to provide an enclosed sterile central flow path which does not contact the housing to thereby minimize the potential for contact contamination of the flow path.
It can be seen that the flexible conduit in conjunction with the seat can provide both a sealed interior flow path and can further provide an additional elastic spring force when mounted with the rigid seat such that longitudinal force applied by insertion of the luer to the closed end of the conduit results in either longitudinal compression or folding of the tubular conduit which will then rebound to its original position when the longitudinal force applied by the luer tip is removed. Since the flow path need not engage the housing, the housing can be provided as only an incomplete cylinder or can be provided as linear support struts, thereby increasing visibility of the flexible conduit and fluid path and allowing more open access to the tabular seat for more easy molding and mounting of the flexible tubular conduit with the seat during manufacture.
In one embodiment, the proximal face of the septum piston of the tubular conduit is soft such that the face will mold with the distal tip of the luer when the luer tip is advanced against the face, thereby providing enhanced sealing of the luer with the face. The face can also include a circumferential membranous apron extending lateral to the face and over the distal end of the housing of the branch. The apron can then be deflected inwardly by the housing as the septum piston is advanced, thereby providing an additional circumferential seal for the luer tip. The rigid tube can be provided as a wedge or tapered cone member to assist in distorting the septum piston perforation into the open position.
A flow deflector or ramp can be provided when the housing of the branch is mounted to a tubing system to form a secondary branch, as in a T or Y configuration. The flow deflector can ramp flow into deadspace within the flexible conduit or rigid tubular seat so as to minimize the trapping of air bubbles or blood within the seat or flexible conduit when the device is used in blood sampling configurations, such as with arterial lines.
The branch of the main conduit can be aligned directly with or perpendicular to the main conduit or can be at an oblique or acute angle with the main conduit. The main conduit is generally discussed below as integral with the valve, but the main conduit may be a separate piece and sold separately, and may be joined with the branch or the aligned secondary bore by a threadable member as, for example, joining a conventional heparin well or prn adapter to a catheter, stopcock, or IV tubing system.
The branch preferably includes at least one external thread or thread receiver for receiving an internal female threading member to allow a secure threaded connection with a conventional luer-lock type connector of the type commonly used with conventional syringes or intravenous tubing systems.
The use of this luer-activated valve in association with IV piggyback administration generally would require the recapping of the luer taper after use so that the luer taper remains sterile between IV piggyback mediation administrations. My U.S. Pat. No. 5,167,643 (the disclosure of which is hereby incorporated by reference as if completely disclosed herein) describes a Docking Station for receiving a blunt cannula such as a tapered luer end to maintain the sterility of the tapered end. The present invention includes the secondary tubing system having a docking station intended for use with a conventional luer taper cannula of the slip tip or luer lock type. This station utilizes a simple membranous cover since the primary function of the cover is to cover and seal the luer within the station, as discussed in the previous patent. The new protection station may include an annular shield for protecting the fingertips against inadvertent contact of the luer taper since the luer taper has been removed from fluid connection with the patient's blood vessel and, therefore, could be contaminated by potentially infectious material which, by even surface contamination of a nurses fingers, could subsequently enter a fissure in the fingers or otherwise be transferred to a mucous membrane where infection could ensue. The station preferably includes a connecting portion for connecting to a proximal portion of the intravenous piggyback system or supporting pole, as described in my aforementioned patent. The combination of a primary fluid system which incorporates a luer-activated valve and a secondary system which incorporates a luer cannula protection station which protects the tapered blunt cannula of the luer provides reliable intermittent connection to the patient with assurance that the luer taper remains sterile between use and eliminates the need for the utilization of multiple caps, thereby reducing overall cost.
It is the purpose of the present invention to provide an inexpensive medical valve which can be activated by a conventional luer taper cannula and thereby be widely implemented within existing hospital systems.
It is further the purpose of the invention to provide a valve with a central sealed flow path through a flexible conduit, thereby minimizing the potential for contamination of the flow path and allowing for insertion of conventional blunt cannulae.
It is further the purpose of this invention to provide a medical valve which can be easily wiped with antiseptic to eliminate the need for recapping after use. It is further the purpose of this invention to provide a medical valve having substantially no deadspace adjacent its proximal portion to eliminate the pooling of blood or liquid within the valve so that the valve may be repetitively used for the aspiration of blood and reinjection of liquids.
It is further the purpose of this invention to provide a luer-activated opening of a central fluid path which is automatically aligned with the bore of the luer and which will directly communicate with the bore of a luer taper cannula upon the transmission of longitudinal force of the luer taper cannula against the septum piston, thereby providing a mechanism for the opening of a centrally-positioned fluid path at the same time tight sealing occurs adjacent the distal end of the luer taper cannula against the septum piston. It is further the purpose of this invention to provide a valve which progressively closes from its proximal extent to its distal extent, thereby expressing residual fluid from the valve away from the environment. It is further the purpose of this invention to provide a two-piece valve which can be simply manufactured by the insertion of an elastomeric septum piston into a rigid tubular structure, thereby avoiding the need for expensive and complex insert molding.
These and other features will become evident from the summary and detailed description described below. Furthermore, these and other objects and advantages of the invention will be further set forth in the description which follows and, in pan, will be learned from the description or may be learned by practice of the invention. The objects and advantages of the invention may be realized by means of the instrumentalities and combinations particularly pointed out in the appended claims.
In one preferred embodiment, the luer tapered cannula receiving valve 5 (
In the preferred embodiment, a silicone lubricant is provided to enhance the sliding piston-like action of the sealingly received septum piston 60 against the side walls 42 and 46 of the cylinder 18. As noted previously, the slit 72 extends completely through the cylindrical septum piston 60. The long transverse axis of the slit 72 (in the transverse plane of the septum piston) is aligned within the same plane as the longitudinal axis through the opposing projecting members 50 of the distal bore portion 38 (
A septum wiper 78 is provided and a bore detent 79 is provided to retain the elastomeric septum piston 60 within the secondary bore by receiving the septum wiper. The wiper 78 is flexible to provide a tight seal. A second wiper (not shown) can be provided adjacent the proximal end 62 to provide additional sealing. The wiper 78 includes a partial recess 79 for receiving the projecting members 50 to allow tight sealing when passing over the members 50. After insertion, during manufacture, the septum wiper 78 engages the detent 80. As shown, the septum wiper 78 is configured so as to allow distal displacement of the septum piston 60 out of its detented position (of FIG. 1), but to prevent proximal bore displacement of the septum piston 60 out of its detented position.
In operation, when a connection, injection, or aspiration is required, a conventional luer taper cannula 35 having a central opening 94 is inserted into the proximal bore portion 34 of the cylinder 18. Advancement of the luer taper cannula 35 causes longitudinal displacement of the septum piston 60 from within the proximal bore portion 34 into the distal bore portion 38 between the projecting portions 50. This causes compression of the septum 60 in an axis which is aligned with the long transverse axis of the longitudinal slit 72 so that the slit 72 is transversely shortened, and thereby opened to define an open fluid flow channel 100. The formerly cylindrical septum piston 60 is narrowed in one transverse axis and bulges and widens in the perpendicular transverse axis, thereby producing an ellipse with a shortened and now opened central slit 72 (FIG. 2 and FIG. 5), although the actual configuration within the cylinder may be limited in situ by the cylinder wall 46. As noted previously, the projecting members 50 progressively enlarge to progressively narrow the width of the distal portion 38 between the projecting members 50. If the elastomer is soft, this will cause the slit 72 to progressively shorten from its proximal extent toward its distal extent and, therefore, the flow channel 100 will be narrower in the proximal extent and wider toward the distal extent. If the elastomer is comprised of a harder elastomer such as high durometer silicone, for example, exceeding 60 durometer-A medical grade, then the slit 72 will be wedged widely open along its entire length.
After the injection or aspiration is complete, the luer taper cannula 35 is withdrawn from the proximal portion 34 of the cylinder 18. Upon removal of the luer taper cannula 35, the septum piston 60 rebounds gently from its formerly advanced position back into its proximal sealing position with the proximal end of the septum piston returning to a position adjacent the proximal end 30 of the cylinder 18. The lubrication of the septum piston 60 and the progressive narrowing of the opposing members 50 causes the resilient septum piston 60 to rebound back from its advanced position. By using a slowly progressive taper, the force of the rebound can be minimized to prevent kickback of the luer 35 from the proximal portion 34 of the cylinder 18. In addition, an umbrella, as will be discussed, could be attached so as to provide less redundancy and, therefore, to provide elastic rebound. As discussed previously, during the return of the septum piston 60 back toward its resting position, the flow channel 100 can progressively close from its proximal extent to its distal extent to effectively express any liquid contained within the flow channel 100 back toward the main bore 10, rather than out toward the cylinder 18.
It can be seen that, by utilizing the achievement of lateral compression by the application of longitudinal displacing force against the septum piston, the rebound force of the septum piston is minimized. In other words, despite the fact that the valve is engaged by longitudinal force of the luer taper, the valve is actually opened by lateral compressive force of the cylinder wall or projecting members, rather than the directly applied activating longitudinal force. Therefore, it is not necessary to have a high resisting longitudinal rebound force to achieve and maintain a tight seal. For this reason, it is not necessary for this valve to utilize a deadspace filler of the type described in my U.S. Pat. No. 5,178,607, as will be discussed later. However, the implementation of deadspace displacement or filler provides an opportunity for utilization in valve, septum piston, or piston configurations wherein deadspace is present and wherein it is desirous to eliminate this deadspace so that recapping is not necessary.
Another similar septum piston embodiment, as shown in
In one septum piston embodiment (FIGS. 6A and 6C), a projecting main bore occluding member 102' is provided adjacent the distal end of the septum piston 60'. The occluding member 102' includes a circular distal end 104' and is sized to be sealingly received into the main bore 10 when the septum piston 60' is advanced. For operation of this embodiment, the cylinder 18 is preferably positioned at an angle relative to the main housing 10 and the secondary bore 22 intersects the main bore 10 at an angle which may be 30°C-90°C (as in
In another embodiment (FIG. 6C), the septum piston 60" is shorter and a soft deadspace filler 140" is provided. The deadspace filler can be of the type and design for use with very blunt cannulae as discussed in my U.S. Pat. No. 5,178,607 (the disclosure of which is hereby incorporated by reference as if completely disclosed herein). The soft outer filler 140" serves to minimize kickback of the luer taper cannula 35 and functions as a deadspace occluder or displacer. The soft filler 140" can be comprised of foam rubber which can be covered by a medical grade silicone of the type similar to that used in foam cuffs sold by the Bavona Corporation for tracheostomy tubes or can be otherwise constructed to have a similar ease compressibility and relatively low volume in the compressed state and high volume in the resting non-compressed state. The soft portion 140" provides a central perforation 152" for receiving the luer taper cannula 35 through the portion 140" and subsequently into contact with the less easily compressible septum piston 60". Although it is preferred that the two portions be bonded together, they may be separate and the proximal portion may be bonded to the proximal inner walls 42 or the cylinder end 30 or may include an umbrella of the type shown in
Alternative septum and housing configurations are shown in
As shown in FIG. 12 and
In the preferred embodiment, the slit 372 in the resting state has a length which is approximately equal or slightly greater than the diameter of a conventional lure taper 177. As shown in
It should be clear that alternative configurations of the septum piston are possible within the scope of the present invention. These configurations result in enhanced opening of the slit and minimize the volume of the septum so that adequate clearance is provided to allow insertion into septum the within the spatial limitations defined by a conventional female threading member of a luer lock connector. The septum piston could be otherwise distorted, either longitudinally or horizontally, in association with longitudinal displacement to achieve an open fluid path. It is, however, preferable that this open fluid path extend through the septum piston and directly in contact with the bore of the luer taper cannula so as to facilitate flow and to absolutely minimize the trapping of fluid or blood within the valve.
Although an elastic membranous boot is shown, a perforated deadspace filler, of the type previously discussed with a compressed low displacement volume, may be used to fill the bore of the station and to receive and cover the luer taper.
Although the presently preferred embodiments of this invention have been described, it will be obvious to those skilled in the an that various changes and modifications may be made therein without departing from the invention. Therefore, the claims are intended to include all such changes and modifications which may be made therein without departing from the invention. Therefore, the claims are intended to include all such changes and modifications that fall within the true spirit and scope of the invention.
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