FR3100457A1 - syringe for injecting additional liquid into a multi-way stopcock - Google Patents

Abstract

The invention relates to a syringe formed by a tubular body and a piston, the tubular body (30) having at its distal end a connector (31) which can be connected to a multi-way valve. Said body (30) also has a frustoconical cavity (36) Figure 2

Description

syringe for injecting additional liquid into a multiway valve

Field of invention

The present invention relates to the field of infusion lines for the administration of medical treatment liquids, such as chemotherapy products, to a patient, and more particularly a syringe intended to inject an additional liquid into a multiway valve fitted to such a line. infusion.

An infusion line for the administration of medical treatment liquids to a patient, such as anesthetic or chemotherapy products, comprises in known manner:

- a valve comprising a fluid inlet channel comprising means for connection to a syringe, and a fluid outlet channel, and

- an extension piece, one of the ends of which, called the proximal end, is mounted on the fluid outlet channel and the other end of which, called the distal end, is equipped with means for connection to a catheter.

The use of such an infusion line includes the following steps:

• Connect a first flush syringe containing a flush product, such as saline or glucose, to the faucet fluid inlet port,
• Purge the valve and the extension by injecting into them a sufficient quantity of the rinsing product contained in the rinsing syringe,
• Disconnect the rinsing syringe,
• Connect an administration syringe containing a medical treatment liquid to the valve's fluid inlet port,
• Inject the medical treatment liquid to the catheter using the administration syringe,
• Disconnect the extension line from the catheter.

During these manipulations, it is necessary to unclog one of the channels before connecting the syringe, then to temporarily put the plug on to allow manipulation of the syringe to inject an additional fluid, then to disconnect the syringe and close the channel with cap.

During these manipulations, it is of course essential not to put the cork in contact with a pathogenic surface, and not to drop or misplace the cork.

State of the art

Known in the state of the art is an example of a medical valve and a kit comprising such a valve described in patent EP3283162. This medical faucet comprises a body provided with at least two female connectors and one male connector, a movable plug mounted in the body, provided with a rotation lever and comprising a fluid circulation channel, and a reinforcing collar integral with at least two of the connectors. This patent also relates to a kit for preparing a product to be injected, preferably a mixture or an emulsion, comprising such a medical tap and a syringe formed by a tubular body.

Disadvantages of the prior art

Prior art solutions present a high risk of contamination of the removed three-way valve cap during syringe attachment.

Solution provided by the invention

In order to remedy these drawbacks, the present invention relates, in its most general sense, to a syringe formed by a tubular body and a piston, the tubular body having at its distal end a connector which can be connected to a multiway valve, characterized in that said body also has a tapered cavity.

Preferably, the inner surface of at least the rear section of said tapered cavity is grooved.

According to a variant, said cavity has in its front section a coating that is elastically deformable in the radial direction.

Advantageously, said cavity has a taper of between 5 and 15°.

The invention also relates to an infusion kit comprising a multiway valve having a plurality of connectors that can be closed off by plugs and a syringe formed by a tubular body and a piston, the tubular body having at its distal end a complementary end piece of said connectors, characterized in that said body further has a frustoconical cavity having a front section greater than the front section of said cap, and a rear section lower than said front section of said cap.

Detailed description of a non-limiting example of the invention

The present invention will be better understood on reading the detailed description of a non-limiting example of the invention which follows, with reference to the appended drawings where:

Figure 1 shows a perspective view of a known multiport valve.

FIG. 2 represents a view in section along a median longitudinal plane of a body of a syringe according to the invention.

FIG. 1 represents an example of a three-way valve, constituted in known manner by a body (1) of transparent plastic material extended by three end pieces (2 to 4). A tap (5) directs the flow of fluids between the three end pieces (2 to 4). End caps are generally standardized. An example of a widely used mouthpiece is known by the trade name "LUER LOCK" whose specifications are standardized by the following standards:

• ISO594-1:1986 “6% conical (Luer) assemblies for syringes and needles and certain other devices for medical use – Part 1: General specifications”
• ISO594-2:1998 “6% cone (Luer) assemblies for syringes and needles and certain other devices for medical use – Part 2: Locking assemblies”.

In the example described, the valve has two inlets (3, 4) with a female LUER LOCK connector (2) and one outlet with a male LUER LOCK connector.

These end pieces (2 to 4) are temporarily blocked by blanking plugs (12 to 14). They have a notched crown (22 to 24) of cylindrical shape.

The body (30) of the syringe illustrated in FIG. 2 is made in a known manner of siliconed transparent polypropylene to receive a polypropylene piston with an annular seal of thermoplastic elastomer, with a complex composed of polyethylene/polypropylene/styrene (latex-free) and a silicone surface.

The body has a tip (31) with a male LUER LOCK connector which extends the front end (32) of the body (30) of the syringe, with an off-centering and a longitudinal axis inclined with respect to the longitudinal axis of the cylindrical body (30).

The front end (32) of the body (30) of the syringe and extended axially by a cylindrical body (35) defining a conical cavity (36) whose bottom (33) has a section smaller than the outer section of the toothed crown (22 to 24) of the closing plugs (12 to 14), with a conicity of approximately 10°, the section of the entrance to the conical cavity (36) being greater than the external section of the toothed crown (22 to 24 ) blanking plugs (12 to 14).

The inner surface of the conical cavity (36) is grooved, at least in the rear section (33). The front section (34) can optionally be covered by an elastic tubular sleeve having an internal channel corresponding to the section of the toothed crown (22 to 24) of the stopper plugs (12 to 14).

Use

The syringe can be used for both:

• Loosen and remove the blanking plug (23) from the fitting (3) of a valve
• Maintain the blanking plug (23) without risk of contamination
• Inject fluid into the three-way valve
• Replace the blanking plug (23) on the end piece (3) of the valve.

These operations can be carried out intuitively and effortlessly by the operator, avoiding manipulation of the stopper and the risk of contamination.

Claims (5)

Syringe formed by a tubular body and a piston, the tubular body (30) having at its distal end an end piece (31) which can be connected to a multiway valve, characterized in that the said body (30) furthermore has a tapered cavity (36) . Syringe according to claim 1, characterized in that the inner surface of the tapered cavity (36) is fluted, at least in its rear section (33). Syringe according to Claim 1, characterized in that the said cavity (36) has in its front section a coating (34) which is elastically deformable in the radial direction. Syringe according to Claim 1, characterized in that the said cavity has a taper of between 5 and 15°. Infusion kit comprising a multiway valve having a plurality of connectors that can be closed off by plugs and a syringe formed by a tubular body (30) and a piston, the tubular body (30) having at its distal end a tip (31) complementary to said connectors , characterized in that said body further has a tapered cavity (36) having a front section greater than the front section of said cap, and a rear section lower than said front section of said cap.