Syringe system for enteral nutrition

Description

FIELD

[0001] The present disclosure generally relates to an enteral feeding syringe assembly.BACKGROUND

[0002] In a medical environment, many devices have tubing or other fluid conduits adapted for manual connection in order to provide a fluid connection between devices or between a device and a patient including enteral feeding pumps and enteral feeding lines. For example, enteral feeding or delivery of medicines to the gastrointestinal tract may be accomplished by connecting an enteral feeding connector to an oral syringe. Some patients, including particularly neo-natal patients, are best served by a high degree of accuracy in the volume of fluid delivered to the patient. Each of these devices includes one or more connectors that a user or practitioner may connect together.

[0003] Figure 1 shows a conventional enteral feeding connector assembly including a male enteral feeding connector 1 and a female enteral feeding connector 3 configured to be connected to one another for use in connecting enteral fluid lines in healthcare applications. The female enteral feeding connector 3 receives a male connector portion 1A of the male enteral feeding connector 1 within an interior space 5. An exterior surface of the male connector portion 1A engages and seals with an interior surface of the female enteral feeding connector 3 to achieve a fluid-tight connection. The enteral feeding connectors 1, 3 may then deliver fluid in the fluid lines through a fluid passage 7 extending through the connectors. Fluid is typically delivered from the female connector 3 to the male connector 1. A dead space 9 is located adjacent an inlet of the male enteral feeding connector 1. The dead space 9 defines an area of the interior space 5 in the female enteral feeding connector 3 that is not occupied by the portion of the male enteral feeding connector 1 received therein. A problem with having this dead space is that fluid intended for delivery can pool within the dead space causing an under dose of fluid to be delivered to the patient. Conversely, the pooled fluid may not be accounted for in the fluid measurement resulting in an overdose of fluid to the patient. Although errors may be small, they can be important for certain patients, such as neo-natal infants.

[0004] D1 WO 91 / 05581 pertains to a coupling system usable to transfer materials from one flow conduit to another, more particularly, to two-part coupling members with a first part including a pre-slit septum and a second part including a blunt cannula. The pre-slit septum slidably receives the blunt cannula to effect the coupling.

[0005] D2 WO 2007 / 131086 pertains to a medical device and more particularly to a syringe, either traditional or pre-filled, having a recessed nose section adapted to prevent contamination from human contact when connecting a frontal attachment such as a CLAVE(R) connector for introducing medication into a closed IV system or a luer lock needle attachment.

[0006] D3 EP 0 520 618 pertains to a dual chamber prefillable syringe in which predetermined quantities of first and second medicines are liquid-tightly partitioned in a syringe outer cylinder in a sterilized state for injecting both the medicines in mixture in one chamber as parenteral solution in the case of injecting.

[0007] D4 US2012 / 0022457 A1 shows an Enteral feeding connector assembly, particularly to a syringe with male a connector having a tip surrounded by a shroud with internal threads and a female connector for connection to the syringe. The female connector has an female tip and a shroud with an external thread for mating with the syringe.

[0008] D5 US2007 / 0129705 A1 shows a medical connectors, particularly adaptation of a typical male and female luer connectors. The adaptation suggests use of a threaded shroud surrounding a luer tip also for a female luer connector, resulting into a double threaded connection by the female luer and by the threaded shroud.SUMMARY

[0009] In one aspect, an enteral feeding syringe assembly generally comprises a syringe including an engagement surface. A projecting connector portion extending from the engagement surface. An interior chamber is disposed within the syringe. The projecting connector portion includes an exterior circumferential wall and a fluid passage extending through the projecting connector portion. The fluid passage is in fluid communication with the interior chamber of the syringe. A connector is configured for attachment to the syringe to connect the syringe to a fluid conduit or reservoir. The connector comprises a male connector portion including a rim and a passage extending through the male connector portion. The projecting connector portion of the syringe is sized and shaped to be received in the male connector portion of the connector when the connector is attached to the syringe such that the exterior wall of the projecting connector portion sealingly engages the male connector portion within the passage of the male connector portion and the rim of the male connector portion engages the engagement surface of the syringe sealing the male connector portion around the projecting connector portion.

[0010] In another aspect, an enteral feeding syringe generally comprises a barrel and a projecting connector portion extending from the barrel. A shroud extends around the projecting connector portion. An interior chamber is disposed within the barrel. The projecting connector portion includes an exterior circumferential wall and a fluid passage extending through the projecting connector portion. The fluid passage is in fluid communication with the interior chamber of the barrel. The shroud defines an opening that exposes the projecting connector portion.BRIEF DESCRIPTION OF THE DRAWINGS

[0011] FIG. 1 is a longitudinal section of a prior art enter feeding FIG. 2 is an exploded view of an enteral feeding syringe assembly; FIG. 3 is a perspective of the enteral feeding syringe assembly showing a cap attached to a syringe of the assembly; FIG. 4 is a longitudinal section of the assembly of Fig. 2; FIG. 5 is a perspective of the enteral feeding syringe assembly showing an enteral feeding connector attached to the syringe of the assembly; FIG. 6 is a longitudinal section of the assembly of Fig. 4; FIG. 7 is an enlarged fragmentary perspective of the syringe; FIG. 8 is an enlarged fragmentary elevation of a portion of Fig. 3; FIG. 9 is an enlarged fragmentary elevation of a portion of Fig. 5; FIG. 10 is a perspective of the enteral feeding connector; and FIG. 11 is a perspective of the cap.

[0012] Corresponding reference characters indicate corresponding parts throughout the drawings.DETAILED DESCRIPTION OF THE DRAWINGS

[0013] Referring to Figs. 2-6, an enteral feeding syringe assembly is generally indicated at 10. The syringe assembly is configured to fluidly connect to a fluid conduit (e.g., a feeding tube) or a reservoir (e.g., medical tubing, bottle, nutrient bag, etc.) for retrieving fluid from the fluid reservoir or delivering fluid to a subject through the fluid conduit. The syringe assembly 10 comprises a syringe 12 including a female fitting 14 on a distal end of the syringe for connecting to a complementary male connector. The assembly 10 may further comprise a cap 16 including a male connector portion 18 (Fig. 4) for providing a sealed connection with the female fitting 14 of the syringe 12 when the cap is secured (e.g., threaded) onto the syringe. Alternatively, an enteral feeding connector 20 may include a male connector portion 22 (Fig. 6) for providing a sealed connection with the female fitting 14 on the syringe 12 when the enteral feeding connector is secured (e.g., threaded) onto the female fitting of the syringe. When the enteral feeding connector 20 is properly secured to the syringe 12, a tube connector portion 24 of the enteral feeding connector can be connected to a fluid conduit or reservoir to fluidly connect the syringe to the fluid conduit or reservoir. A plunger 13 can be received in a barrel of the syringe 12 and used to discharge fluid from the syringe and to draw fluid into the syringe. In the illustrated embodiment, the female fitting 14 is formed integrally with a remainder of the syringe 12. However, the female fitting 14 could be formed separately from the syringe 12 and suitably attached to the syringe.

[0014] Referring to Fig. 8, the female fitting 14 of the syringe 12 may comprise a projecting connector portion 30 extending from a floor 32 (broadly, "engagement surface") surrounding the projecting connector portion. The floor 32 may extend circumferentially around the entirety of the projecting connector portion 30 and faces axially outward from the syringe. A fluid passage 34 may extend through the projecting connector portion 30 from an open distal end of the projecting connector portion to an interior chamber 36 of the syringe 12. A connector shroud 38 may extend around the projecting connector portion 30. The shroud 38 of the female fitting 14 may include openings 62 (Fig. 7), which help to prevent intake of air into the interior chamber 36 of the syringe. Air inside the shroud 38 that is displaced by the female fitting 14 when it enters the shroud to make a fluid connection can exit the shroud through the openings 62, rather than being forced into the syringe 12. Keeping air out of the syringe 12 is desirable. The projecting connector portion 30 of the female fitting prior to connecting the cap 16 or enteral feeding connector 20 to the syringe 12 is visible through the opening. Similarly, the connection of the projecting connector portion 30 to the male connector portion 22 of the enteral feeding connector 20, or to the male connector portion 18 of the cap 16 are visible from the side of the female fitting 14 through the openings 62. Each opening 62 may extend generally from a location adjacent the floor 32 of the female fitting 14 past a distal tip of the projecting connector portion 30 exposing an entire length of the projecting connector portion through the opening. In the illustrated embodiment, there are two openings 62. However, other numbers of openings 62 are within the scope of the present disclosure. Further, it is envisioned that the openings 62 could be omitted without departing from the scope of the present disclosure.

[0015] A circumferential side wall 40 of the projecting connector portion 30 may be configured for sealing engagement with respective inner surfaces 42, 44 of the male connector portions 18, 22 of the cap 16 and enteral feeding connector 20, respectively (Figs. 8-11). For instance, the circumferential side wall 40 of the projecting connector portion 30 may have a continuous profile such that the projecting connector portion is free of any channels or grooves in the outer surface of the projecting connector portion. The projecting connector portion 30 may taper from the floor 32 of the female fitting 14 to a distal end of the projecting connector portion. An outer surface 48 of the connector shroud 38 includes threads 50 for engaging threads 52 on an inner surface of the cap 16, or threads 54 on an inner surface of the enteral feeding connector 20 for securely engaging the female fitting 14 with either the cap or the enteral feeding connector. The circumferential side wall 40 of the projecting connector portion 30 engages and seals with an interior surface of inner surface 42 of the male connector 18 when the cap 16 is attached, or engages and seals with the inner surface 44 of the male connector portion 22 of the feeding connector 20 depending upon whether the cap or feeding connector is connected to the syringe 12. In addition, a rim 58 of the male connector portion 18 of the cap 16, and a rim 60 of the male connector portion 22 of the enteral feeding connector 20 may engage and seal with the floor 32 of the female fitting 14 of the syringe 12 when either the cap or the enteral feeding connector are attached to the syringe. Connection of the female fitting 14 to the male connector portion 22 of the enteral feeding connector 20 establishes fluid communication between the fluid passage 34 in the syringe 12 and a fluid passage 56 in the enteral feeding connector for placing the interior chamber 36 of the syringe 12 in fluid communication with a fluid conduit or reservoir connected to the tube connector portion 24 of the enteral feeding connector. Moreover, the engagement between the female fitting 14 of the syringe 12 and the male connector portion 22 of enteral feeding connector 20 provides both a sealed connection along the circumferential side wall 40 of the projecting connector portion 30 with the inner surface 44 of the male connector portion 22 and a sealed connection extending around the projecting connector portion along the floor 32 of the female fitting. Thus, a sealed connection is established along two separate surfaces of the female fitting 14. Therefore, a fluid tight connection is ensured when the enteral feeding connector 20 is attached to the syringe 12. It will be appreciated that the sealing reception of the projecting connector portion 30 in the fluid passage 56 effectively reverses the male / female connection of the prior art (Fig. 1). However, the present invention provides additional sealing by sealing engagement of the rim 58 with the floor 32.

[0016] Referring to Figs. 4, 8, and 11, the cap 16 may comprise the male connector portion 18 including a passage 66 extending through the male connector portion, and an annular portion 68 surrounding the male connector portion. The cap 16 may include a grip portion 70 (Figs. 3 and 11) for manipulating the cap. The cap 16 is configured to cover the female fitting 14 of the syringe 12 and block the fluid passage 34 of the projecting connector portion 30 when the enteral feeding syringe assembly 10 is not being used. When it is desired to use the enteral feeding syringe assembly 10, the cap 16 can be removed from the female fitting 14 of the syringe 12 and the enteral feeding connector 20 can be attached to the female fitting.

[0017] In use, the enteral feeding syringe assembly 10 places the syringe 12 in fluid communication with a fluid reservoir for retrieving fluid from the fluid reservoir. Alternatively, the enteral feeding syringe assembly 10 can place the syringe 12 in fluid commination with a fluid conduit to deliver fluid to the fluid conduit. The engagement between the female fitting 14 of the syringe 12 and the male connector portion 22 of enteral feeding connector 20 ensures that a fluid tight connection is produced when the enteral feeding connector is attached to the syringe. No portion of the syringe volume is occupied by a mating connector. Therefore the volume of fluid in the syringe is always constant, even after connection to the enteral feeding connector is made.

[0018] Having described embodiments of the invention in detail, it will be apparent that modifications and variations are possible without departing from the scope of the invention defined in the appended claims.

[0019] When introducing elements of the present invention or the preferred embodiments thereof, the articles "a", "an", "the" and "said" are intended to mean that there are one or more of the elements. The terms "comprising", "including" and "having" are intended to be inclusive and mean that there may be additional elements other than the listed elements.

[0020] The scope of the invention is solely defined by the appended claims.

Claims

1. An enteral feeding syringe (12), comprising an engagement surface (32), a projecting connector portion (30) extending from the engagement surface (32), a shroud (38) extending around the projecting connector portion (30), and an interior chamber (36) disposed within the syringe (12), the projecting connector portion (30) including an exterior circumferential wall (40) and a fluid passage (34) extending through the projecting connector portion (30), the fluid passage (34) being in fluid communication with the interior chamber (36) of the syringe (12), characterized in that the shroud (38) comprises a threaded outer surface for mating with threads (54) on an inner surface of a connector (20) and a beveled inner surface for receiving a male connector portion (22) having a frustoconical outer surface.

2. The syringe (12) of claim 1, wherein the shroud (38) defines an opening (62) extending from a location adjacent the engagement surface (32) past a distal tip of the projecting connector portion (30) exposing the projecting connector portion (30).

3. The syringe (12) of claim 2, wherein the opening (62) has a height and the projecting connector portion (30) has a length, the height of the opening (62) being greater than the length of the projecting connector portion (30) such that an entirety of the length of the projecting connector portion (30) is exposed through the opening (62).

4. An enteral feeding syringe assembly (10) comprising: a syringe (12) according to claim 1; and a connector (20) configured for attachment to the syringe (12) to connect the syringe (12) to a fluid conduit or reservoir, the connector (20) comprising the male connector portion (22) including a rim (60) and a passage (56) extending through the male connector portion (22), the projecting connector portion (30) of the syringe (12) being sized and shaped to be received in the male connector portion (22) of the connector (20) when the connector (20) is attached to the syringe (12) such that the exterior wall (40) of the projecting connector portion (30) sealingly engages the male connector portion (22) within the passage (56) of the male connector portion (22) and the rim (60) of the male connector portion (22) engages the engagement surface (32) of the syringe (12) sealing the male connector portion (22) around the projecting connector portion (30) the threaded outer surface of the shroud (38) is for mating with threads (54) on the inner surface of the connector (20).

5. The assembly (10) of claim 4, wherein the engagement surface (32) extends circumferentially around the projecting connector portion (30).

6. The assembly (10) of claim 4, wherein the engagement surface (32) faces axially outward of the syringe (12).

7. The assembly (10) of claim 4, further comprising an opening (62) in the shroud (38), a height of the opening (62) being greater than a length of the projecting connector portion (30) such that an entirety of the length of the projecting connector portion (30) is exposed through the opening (62).

8. The assembly (10) of claim 4, wherein the connector (20) comprises a tube connector portion (24) integrally formed with the male connector portion (22) and configured for connecting to a medical tube.

9. The assembly (10) of claim 4, further comprising a cap (16) for attachment to the syringe (12) to cover the fluid passage (34) in the projecting connector portion (30) of the syringe (12), the cap (16) comprising a male connector portion (18) including a rim (58), the male connector portion (18) of the cap receiving the projecting connector portion (30) of the syringe (12) when the cap (16) is attached to the syringe (12) such that the rim (58) of the male connector portion (18) of the cap engages the engagement surface (32) of the syringe (12) sealing the male connector portion (18) of the cap (16) around the projecting connector portion (30).