MXPA97009242A - Med connector - Google Patents

Abstract

The present invention relates to a method for introducing and removing fluids from a patient, characterized in that it comprises the steps of: inserting a luer to a first position in a secondary conduit of a medical connector, the medical connector has a primary conduit with a fluid primary fluid flowing through this, a secondary conduit and an elastic, hollow valve, such that the primary fluid flows through the valve when the valve is in an uncompressed state, and wherein the primary fluid is prevented from flowing through the valve. valve when the valve is in a compressed state, forcing a second fluid contained in the luer to the secondary conduit, thereby deforming the valve slightly, such that the primary and secondary fluids can travel through the medical connector to a patient , simultaneously, the insertion of the luer to a second position in the secondary conduit, such that the primary fluid can not pass through said valve, while the fluid communication between the luer and the patient is established, the withdrawal of the fluid from the patient through the primary and secondary ducts and towards the luer, and the removal of the luer, thereby restoring the flow of the primary fluid from the source thereof through the medical connector to the patient

Description

MEDICAL CONNECTOR BACKGROUND OF THE INVENTION FIELD OF THE INVENTION This invention relates to the field of medical devices that use a valve to transfer intravenous medication from one location to another. More specifically, this invention is directed to an improvement in medical valves to ensure that the patient receives the full dose of medication, while also providing a means to draw blood from the patient.

DISCUSSION OF THE BACKGROUND The manipulation of fluids for parenteral administration in hospital and medical facilities, involves routinely the use of connectors to facilitate the movement of fluids between two points. It is often desirable for the patient to receive medication from a number of different sources using the same IV. Such a system can be achieved, for example, by using a Y-connector, a coiled connector, a T-connector or a manifold. Such devices have at least one secondary product REF: 26207 connected with the primary conduit to add one or more secondary fluids, such as drugs, for example, the primary fluid that is being infused to a patient through the primary conduit. Many connectors or valves, especially those that employ various mechanical components, have a relatively high volume of fluid space within them. A serious problem in the medical field has been the existence of this "dead space" at the intersection between the arm and the main orifice in the medical connectors that prevent the patient from receiving the total dose of medication, since some of the medicine remains in the dead space of the connector. For example, in a number of multiples of the prior art, the operator inserts a syringe into the secondary product to introduce a secondary fluid into the primary fluid stream. However, due to the dead space between the end of the syringe and the primary conduit passage, some of the secondary fluid will remain at the junction between the secondary conduit and the primary conduit. Prior valve devices have focused on the elimination of unwanted dead space in such devices. A one-way valve apparatus formed in such a way that the creation of an unwanted volumetric dead space is substantially avoided, is shown in U.S. Patent No. 4,666,429 to Stone and in U.S. Patent No. 3,416,567 to Von Dardel et al. to the. In the various embodiments described, a movable member is positioned adjacent the inner wall of the primary conduit at the junction between the secondary and primary conduits so that the movable member forms a one-way valve. The design of the secondary conduit allows the tip of the nozzle of a syringe to be substantially adjacent to the movable element. The movable movement is partially displaced due to the fluid pressure of the secondary fluid flow through the secondary conduit to the primary conduit, thus allowing the secondary fluid to pass through the movable member and enter the primary conduit stream. Once the secondary fluid passes through the joint, the movable element returns to its original position, blocking the junction between the primary and secondary conduits. In the intravenous environment, it is often desirable to use a device that has the ability to either introduce fluid medication or draw blood from a patient. However, the movable element of the '429 and' 567 patents provide for single-way fluid flow only, since the movable element does not move due to fluid flow in the primary passage, and therefore, fluid from The patient can not be removed to the secondary duct. In two-way valves, it is advantageous to draw the patient's blood to determine if the IV system is properly inserted in the patient's vein to provide the medication. further, two-way valves have the additional advantage of having the ability to draw blood samples from the patient. An example of a two-way valve is shown in U.S. Patent No. 5,269,771 to Thomas, et al. A hollow plunger means extends through the valve means into a housing to provide free fluid communication between the inlet and outlet of the device through the middle passage of the plunger means. A syringe coupled to the inlet may then introduce fluid to the patient or, alternatively, withdraw fluid from the patient. A serious disadvantage of this prior art device is the large amount of volumetric dead space that exists not only within the central passage of the plunger means, but also within the passages of the housing. Thus, a large amount of the medication to be transferred to the patient remains in the dead space, thus avoiding the provision of an exact amount of medication. The provision of an exact amount of medication can be critical in some situations, where chemotherapeutic agents are being administered or small children are being treated. A cheap medical connector to transfer medication from a number of different sources using the same IV, where the dead space is minimized and the fluid in the secondary conduit is bidirectional, would be of great benefit to the medical community.

BRIEF DESCRIPTION OF THE INVENTION The medical connector of this invention has several characteristics, none of which is solely responsible for its desirable attributes. Without limiting the scope of this invention as expressed by the claims that follow, its most prominent features will now be briefly described. After considering this discussion, and particularly after reading the section entitled "Detailed Description of the Drawings", one will understand how the features of this invention provide advantages that include safety, reliable and repeatable performance, simplicity of use and manufacture, eradication of space dead, and capacity for fluid flow in one way or two ways. The present invention relates to a valve placed at the intersection of a primary conduit and a secondary conduit of a medical connector. The valve of the present invention is a hollow, elastic tube oriented along the longitudinal axis of the primary conduit. The tube, in its resting state, blocks the path of the fluid to and from the secondary conduit. The primary conduit has an inlet at its upstream end and an outlet at its downstream end. The primary conduit has an upstream portion defined by the portion between the upstream end and the junction with the secondary conduit, as well as a downstream portion defined by the portion between the downstream end and the junction. The fluid that passes through the primary conduit will pass through the hollow valve, but will not be able to enter the secondary conduit of the connector. Extending from the wall on the exterior side of the valve and into the cavity of the secondary conduit, is a tongue which is positioned off-center within the cavity of the secondary conduit. The external diameter of the valve is slightly larger than the internal diameter of the primary conduit of the connector to ensure a tight fluid fit. The secondary conduit can be formed frustoconically to receive a standard tapered male hermetic connection. A hermetic connection inserted in the secondary conduit can be located in one of two positions. In a first position, the tip of the male seal connects and rests on an annular ring or other protrusion which is integral or attached to the inner wall of the secondary conduit a short distance above the valve tongue. The annular ring or protrusion may be made of the same plastic or other medically inert material from which the medical connector is manufactured. Alternatively, a tongue may be provided within the secondary conduit to provide the same fusion as the annular ring. To inject fluid from the secondary conduit to the patient, the hermetic connection is inserted into the first position and the fluid from a syringe or other medical device in fluid communication with the hermetic connection is introduced into the secondary conduit, so that the fluid pressure The resultant partially displaces the elastic valve, allowing fluid from the syringe to pass through the hermetic connection and past the tube into the primary conductor. Once the fluid in the syringe has passed into the primary conduit, the elastic valve returns to its original shape, stopping fluid communication between the primary and secondary conduits. Due to the distance between the tip of the hermetic connection in the first position with respect to the valve is so small, any dead space in the junction between the secondary conduit and the primary conduit is minimized. In the first position, the medical connector and valve of the present invention acts as a one-way valve activated by fluid pressure. Further, while the hermetic connection is in the first position, the primary fluid continues to flow through the primary conduit from the upstream end thereof to the downstream end thereof. To withdraw fluid from the patient to the secondary canal, the tip of the hermetic connection is pushed further down and mounted on the annular ring or other protrusion, making an audible "click" sound. The clicking sound informs the operator that the hermetic connection is located in the second position inside the secondary conduit. In the second position, the tip end of the hermetic connection engages the valve tongue and forces the tongue downward. As the tongue is pushed down into the primary conduit, the valve walls are deviated downward accordingly and the valve collapses to close the primary fluid flow through the primary conduit upstream of the intersection of the primary and secondary conduits . With the male hermetic connection in the second position, the valve is held in its collapsed position, providing an open passage for withdrawing fluid from the patient to the secondary conduit while effectively maintaining a flow of fluid except for seal through the portion upstream of the primary conduit. Since the primary fluid flow is sealed by the collapsed valve, no clamp is required in the primary conduit to seal the conduit and prevent the primary fluid from flowing during withdrawal of the patient fluid. In addition, the portion of the valve upstream of the joint maintains a tight fluid seal against the inner walls of the primary conduit. Such a configuration ensures that no primary fluid mixes with the patient's blood as the blood is drawn into the secondary conduit. Thus, the present invention provides a pressure activated valve for injecting fluid into a patient, as well as a valve activated by sealing connection to withdraw fluid from the patient. Due to the novel features of the present invention, the present invention overcomes a key problem in the prior art, since it provides a one-way, two-way valve with minimal dead space, while also being inexpensive to manufacture. In an alternative embodiment, instead of using a tab attached to the valve to compress the valve, a movable tongue can be attached to the internal wall of the secondary conduit. In this embodiment the tip of the male hermetic connection is brought into contact with and deflects the movable tongue downwards. In turn, the movable tab forces the elastic valve downward in a position where the valve collapses and seals the primary primary fluid flow passage while preventing communication of open fluid flow between the secondary conduit and the patient.

BRIEF DESCRIPTION OF THE DRAWINGS The preferred embodiments of this invention, which illustrate its characteristics, will now be discussed in detail. These embodiments describe the novel and non-obvious medical connector of this invention, shown in the accompanying drawings, which are for illustrative purposes only. These drawings include the following figures, with similar numbers indicating similar parts: Figure 1 is a partial cross-sectional view of the valve of the present invention in a closed position within a medical connector. Figure 2 is a partial cross-sectional view of the valve of the present invention in an open position within a medical connector for injecting fluid to a patient. Figure 3 is a partial cross-sectional view of the valve of the present invention in an open position within a medical connector for withdrawing fluid from a patient. Figure 4 is a partial cross-sectional view of an alternative embodiment of the medical connector of the present invention wherein the valve is in a closed position. Figure 5 is a partial cross-sectional view of an alternative embodiment of the present invention shown in Figure 4, wherein the valve is in an open position for withdrawing fluid from a patient. Figure 6a is a perspective view of an alternative embodiment of the valve of the present invention showing the valve in a closed position. Figure 6b is a partial perspective cross-sectional view of the valve shown in Figure 6a. Figures 7a and 7b are cross-sectional views of the alternative embodiment of the valve of the present invention, shown in Figures 6a and 6b, wherein the valve is shown in a closed position and in an open position, respectively. Figures 8a and 8b are cross-sectional views of an alternative embodiment of the present invention showing the valve in a closed position and in an open position, respectively.

Figures 9a and 9b are cross-sectional views of an alternative embodiment of the present invention showing the valve in a closed position and in an open position, respectively. Figures 10a and 10b are cross-sectional views of an alternative embodiment of the present invention showing the valve in a closed position and in an open position, respectively. FIGS. 11 and 11b are cross-sectional views of an alternative embodiment of the present invention showing the valve in a closed position and in an open position, respectively. Figures 12a and 12b are cross-sectional views of an alternative embodiment of the present invention showing the valve in a closed position and in an open position, respectively. Figures 13a and 13b are cross-sectional views of an alternative embodiment of the present invention showing the valve in a closed position and in an open position, respectively. Figures 14a and 14b are cross-sectional views of an alternative embodiment of the present invention showing the valve in a closed position and in an open position, respectively.

DETAILED DESCRIPTION OF THE DRAWINGS Figure 1 illustrates a preferred embodiment of the medical connector 10 of the present invention, wherein the valve 20 is in a closed position. The medical connector 10 comprises a primary conduit 11 in fluid communication with a secondary conduit 12, at junction 16. The primary conduit 11 has an inlet 13 at its upstream end and an outlet 14 at its downstream end. The primary conduit 11 has an upstream portion 26 defined by the portion between the upstream end (inlet 13) and the junction 16 with the secondary conduit 12, as well as a downstream portion 27 defined by the portion between the downstream end ( outlet 14) and junction 16. The valve 20 is preferably located at the junction 16. The longitudinal axis of the valve 20 is in alignment with the longitudinal axis of the primary conduit 11. Positioned at the junction 16 of the medical connector 10, the valve 20 in an uncompressed state prevents any fluid flow between the secondary conduit 12 and the primary conduit 11. The valve 20 comprises a hollow, elastic tube 24 and a tongue 21, wherein the tube 24 is further defined by the upstream wall section 23 and downstream wall section 22. The tab 21 of the valve 20 extends from the side wall of the valve 20 to the secondary conduit 12. The wall section downstream of the valve 22 extends a short distance downstream in the primary conduit 11 beyond the junction 16, and the wall section upstream of the valve 23 can comparatively extend a greater distance upstream past the junction 16. Along the internal walls of the conduit secondary 12, is an annular ring 15, placed slightly above the tongue 21 of the valve 20. Preferably, the cavity of the secondary conduit 12 tapers to inside so the secondary conduit 12 can be adapted to fit tightly with a standard end of a medical implement ANSI (American National Standards Institute, Washington, D.C.). Typically, the implement is a syringe, a hermetic connection, or any of a wide variety of conduits used in medical applications. A watertight connection is defined as any tube for fluid communication and can also be commonly used with a medical implement. The hermetic connections may vary in shape and may be conical, cylindrical, or in any other way known to those skilled in the art. The secondary conduit 12 is defined by a proximal end 18 and a distal end which is in the junction 16. Advantageously, the proximal end 18 of the secondary conduit 12 can be equipped with a clamping mechanism to facilitate clamping the secondary conduit 12. to a variety of medical devices or connecting devices. For example, with reference to Figure 1, the fastening lugs 17 near the proximal opening 18 of the secondary conduit 12 are preferably provided, so that the secondary conduit 12 can be attached to any compatible sealing connection fastening device. known to those with skill in the art. As configured, during operation, the fluid from a primary fluid source (not shown) enters the inlet 13 of the primary conduit 11 and flows through the tube 24 of the valve 20 and exits through the outlet 14 of the primary conduit 11 for transmission to a patient. The external diameter of the tube 24 is preferably slightly larger than the inner diameter of the primary conduit 11. Therefore, a tight fluid fit between the valve 20 and the inner wall 29 of the primary conduit 11 is ensured to prevent any flow of the primary fluid between the walls of the tube 24 and the primary conduit 11 and into the secondary conduit 12. With the valve 20 in this configuration, no fluid is allowed to flow between the secondary conduit 12 and the primary conduit 11. With the injection of fluid from a medical implement 30 to the secondary conduit 12, a one-way valve is provided for the flow of fluid from the medical implement 30 to the primary conduit 11 and to the patient. To inject fluid from the secondary conduit 12 to the patient, the medical implement 30 is inserted into a first position in the secondary conduit 12 and the fluid of the medical implement 30 is inserted into the secondary conduit 12. As shown in Figure 2, the The proximal end 31 of the medical implement 30 is inserted into the secondary conduit 12 until the proximal end 31 comes into contact with the annular ring 15. Since the annular ring 15 is placed at a very short distance from the junction 16, the space dead between the proximal end 31 of the medical implement 30 and the joint 16 is minimized. With the edges of the proximal end 31 resting on the annular ring 15, the medical implement 30 is in a first position with which, when injecting the fluid through the medical implement 30, the resultant fluid pressure spatially bends the elastic tube 24 to allow the secondary fluid of the medical implement 30 to pass beyond the the valve 20 and inside the primary conduit 11 and inside the patient. After the secondary fluid of the medical implement 30 has passed through the union 16, the elastic tube 24 is decompressed and returned to its original shape. The ability of the tube 24 of the valve 20 to compress under the pressure of the fluid and to return to its original shape is determined by the elasticity of the material used to manufacture the valve 20. Returning immediately to its original shape with the completion of the pressure of the fluid of the medical implement 30, the valve 20 prevents any return flow of fluid from the outlet 14 to the secondary conduit 12. Further, because the upstream wall section 23 is longer than the downstream wall section 22, the The fluid pressure introduced by the medical implement 30 is not large enough to push the upstream end 28 of the tube 24 to overcome its fluid seal fitted with the walls of the primary conduit 11. Thus, during this procedure, the flow of the primary fluid from the entrance 13 to the secondary conduit 12 is avoided. Alternatively, the valve 20 can be made of a material that does not require the upstream portion 23 of the tube 24 to be longer than the downstream portion 22 of the tube 24, while still achieving the advantages of the present invention. Figure 3 illustrates the two-way valve characteristic of the present invention. As shown in Figure 3, the proximal end 31 of the medical implement 30, deviates the tongue 21 downward, thereby compressing and holding the tube 24 in an open fluid communication position. In order to extract a sample of fluid from the patient, the proximal end 31 of the medical implement 30 is pushed over the annular ring 15, thereby providing an audible "click" sound, as the medical implement 30 is placed in the second position. This "click" sound is an audible signal on which the user can rely to indicate that the medical implement is fixed in the second position within the secondary conduit 12. Alternatively, the user may be able to determine the position of the medical implement 30 in the secondary conduit 12 of the touch and sight, and the audible click would not be necessary. The edge of the proximal end 31 of the medical implement 30 deflects the tongue 21 downwardly in the passageway of the primary conduit 11. The tongue 21 of the valve .20 is specifically designed to be placed off center with the joint 16, to allow the edge from the proximal end 31 comes into contact with the tongue 21 when the medical implement 30 is in the second position. The tongue 21 can be positioned off center towards either side of the secondary conduit 12. However, in certain embodiments, it is desirable to place the tongue 21 closer to the end downstream of the primary conduit 11. In response to the displacement of the tongue 21, the The tube 24 collapses, as shown in Figure 3, to close any primary fluid flow in the primary conduit 11 from the inlet 13. In addition, the upstream wall section 23 also travels in the passageway of a primary conduit 11. , but because the upstream wall section 23 is comparatively longer than the downstream wall section 22, or alternatively, the hardness of the material of the tube 24 does not cause the separation of the upstream wall section 23 from the inner walls 29 of the primary conduit 11 upstream of the junction 16, the force of the medical implement 30 is not large enough to move the current end to 28 of the upstream wall section 23 of its fluid tightness against the inner walls 29 of the primary duct 11. Thus, the primary fluid that flows into the inlet 13 is completely blocked to enter the secondary conduit 12. With an open passage maintained between the outlet 14 and the secondary conduit 12 through the primary conduit 11, an operator can withdraw a fluid sample from the patient within the medical implement 30. Alternatively, the two-way valve feature allows an operator extracts a small amount of fluid from the patient towards the medical implement 30 to determine if the IV system is inserted in the patient's vein so that the medication will be transmitted safely and appropriately to the patient. Advantageously, no clamp is required to seal the flow of the primary fluid in the primary conduit 11 when the fluid is being withdrawn from the patient, since the valve 20 collapses to effectively seal the conduit 11 when the medical implement is inserted. is in a secondary position in the secondary conduit 12. Thus, when the sealed connection 30 is placed in the first position, the valve 20 acts as a one-way valve activated by pressure to activate the fluid to a patient, and when the Hermetic connection 30 is placed in the second position, valve 20 acts as a two-way valve for introducing or withdrawing fluid from the patient. Due to the limited number of components, the medical connector of the present invention is inexpensive and easy to manufacture. In Figure 4 an alternative embodiment of the two-way valve apparatus with a minimum dead space is illustrated. In the alternative embodiment, the valve 20 is a hollow, elastic tube that resides within a primary conduit 11 at the junction 16. As in the preferred embodiment illustrated in Figures 1-3, the valve 20 comprises a tube 24 having an upstream wall section 23 and a downstream wall section 22. Instead of having a tab connected to the tube 44, a tab 25 is attached to the inner wall of the conduit 12, adjacent to the junction 16 and under the annular ring 15. The tongue 25 performs primarily the same function as the tongue 21 of Figures 1-3 to maintain the downstream wall section 42 of the valve 40 in a deformed position, to provide fluid communication between the secondary conduit 12 and the outlet of the primary conduit 14, when the medical implement 30 is in the second position. Figure 5 illustrates the medical implement 30 in the second position within the secondary conduit 12. With the assembled proximal end 31 of the medical implement 30 on the annular ring 15 and in the second position, the edge of the proximal end 31 deflects the tongue 25 down in the passage of the primary conduit 11, to move the valve 40 from the lock of the joint 16, and to collapse the downstream wall section 42 to close the primary fluid flow upstream of the inlet of the primary conduit 13. Removing the medical implement 30 of the second position of the secondary conduit 12, the tongue 25 returns to its natural position within the secondary conduit 12, allowing the elastic tube 44 of the valve 40 to return to its original shape. Alternatively, the annular ring 15 can be replaced by a tongue, a protuberance, a ramp or any other structure known to those skilled in the art. Preferably, the annular ring 15 is made of the same material as the medical connector 10, being a plastic or any other medically inert material. Figures 6a and 6b show an alternate embodiment of the valve 20 of the present invention, which can be used in the medical connector 10. The valve 20 in Figures 6a and 6b have a tongue 21 and a tube 24 with internal blocks 61 and 62 , which seal the flow of the primary fluid upstream when the tongue 21 is pressed down by the medical implement 30 in the second position. Figures 7a and 7b further illustrate the operation of the alternating mode of the valve 20 shown in Figures 6a and 6b. Figure 7a shows the valve 20 in the closed position, while Figure 7b shows the valve 20 in an open position. Figures 8a and 8b show another alternative embodiment of the valve 20 of the present invention, which can be used in the medical connector 10. The valve 20 in Figures 8a and 8b have a tongue 21 and a tube 24 with internal blocks 81 and 82 , which seal the flow of the primary fluid upstream when the tongue 21 is pressed down by the medical implement 30, when the medical implement 30 is in the second position (Figure 8b). Figures 9a and 9b show another alternate embodiment of the valve 20 of the present invention that can be used in the medical connector 10. The valve 20 in Figures 9a and 9b has a tongue 21 and a tube 24 with internal blocks 81 and 82, which seal the flow of the primary fluid upstream when the tongue 21 is pressed down by the medical implement 30, when the medical implement 30 is in the second position. In addition, the tube 24 also collapses when the tongue 21 is compressed. (Figure 9b). Figures 10a and 10b show another embodiment of the present invention. Two internal blocks 81 and 82 close the flow of the primary fluid when the medical implement 30 is in the second position with the tab 21 compressed as shown in Figure 10b. FIGS. 11 and 11b show another embodiment of the valve 20 of the present invention, which seals the flow of the primary fluid upstream when the tongue 21 is compressed by medical implement 30 as shown in FIG.

Figure 11b. Figures 12a and 12b show another embodiment of the valve 20 of the present invention, which seals the flow of the primary fluid upstream when the medical implement 30 compresses the tongue 21 as shown in FIG.

Figure 12b. The valve 20 comprises a tongue 21 and a gate 90, wherein the gate 90 seals the flow of primary fluid upstream in the primary conduit 11, when the medical implement 30 is pushed into the second portion, thereby deflecting the tongue 21. down and forcing gate 90 to close. Figures 13a and 13b show another embodiment of the valve 20 of the present invention, which seals the flow of primary fluid upstream when the medical implement 30 compresses the tongue 21a or the tongue 21b, as shown in Figure 13b. Figures 14a and 14b show another embodiment of the valve 20 of the present invention, which seals the flow of the primary fluid upstream when the medical implement 30 compresses the tongue 21 as shown in FIG.

Figure 14b.

SCOPE OF THE INVENTION The foregoing represents a description of the best mode contemplated for carrying out the present invention, and of the manner and processes for making and using it, in fully accurate, concise, and clear terms to enable any person with skill in the art to which belong, make and use this invention. This invention is, however, susceptible to modifications and alternate constructions of the one discussed above, which are fully equivalent. Consequently, it is not the intention to delimit this invention to the particular embodiments described. On the contrary, the intention is to cover all the alternate modifications and constructions within the spirit and scope of the invention, as expressed generally by the following claims, which particularly indicate and claim in a distinctive manner the subject matter of the invention. It is noted that in relation to this date, the best method known by the applicant to carry out the aforementioned invention, is the conventional one for the manufacture of the objects to which it relates. Having described the invention as above, the content is claimed as property in the following:

Claims (18)

1. A medical connector for use in the transfer of fluids to and from a patient, characterized in that it comprises: a primary conduit, the primary conduit has an upstream branch in fluid communication with a primary source of fluid and a downstream branch in fluid communication with a patient; a secondary conduit in fluid communication with the primary conduit; and a hollow, elastic valve, positioned so that the primary fluid can flow through the valve when the valve is in an uncompressed state, the valve has a tongue extending into the secondary conduit so that a sealed connection inserted into the valve the secondary conduit compresses the tab, thereby preventing the flow of the primary fluid through the connector while allowing both the flow of fluid to the patient from the hermetic connection and the flow of fluid from the patient to the hermetic connection.

2. The medical connector according to claim 1, characterized in that the medical connector further comprises a protrusion placed along the internal wall of the second conduit.

3. The medical connector according to claim 2, characterized in that the protuberance comprises an annular ring.

4. The medical connector according to claim 2, characterized in that the protuberance comprises a pair of tongues placed along the internal wall of the secondary conduit.

5. The medical connector according to claim 1, characterized in that the valve is in fluid-tight engagement with an internal wall of the primary conduit when the valve is in an uncompressed state.

6. The medical connector according to claim 1, characterized in that the hermetic connection can be infested in a first position within the secondary conduit so that the dead space in the secondary conduit is substantially minimized.

7. The medical connector according to claim 6, characterized in that the expulsion of a secondary fluid from the hermetic connection into a secondary conduit deforms the valve, allowing the secondary fluid to enter the first primary conduit and travel to the patient.

8. The medical connector according to claim 7, characterized in that the valve decompresses to its original position after the secondary fluid has passed from the secondary conduit to the primary conduit.

9. The medical connector according to claim 1, characterized in that the hermetic connection can be inserted to a second position inside the secondary conduit, so that the hermetic connection deflects the tongue of the valve, so that the primary fluid is prevented from traveling more beyond the valve, while fluid communication is maintained between the hermetic connection and the patient.

10. The medical connector of claim 2, characterized in that the hermetic connection causes an audible sound when the protrusion is traversed.

11. The medical connector according to claim 1, characterized in that the secondary conduit further comprises a fixing mechanism for fixing the secondary conduit to the hermetic connection.

12. A method for introducing and withdrawing fluids from a patient characterized in that it comprises the steps of: inserting a hermetic connection in a first position in a secondary conduit of a medical connector, the medical connector has a primary conduit, a secondary conduit, and a hollow valve , elastic, so that a source of a primary fluid can flow through the valve when the valve is in an uncompressed state and where the primary source of fluid is prevented from flowing through the valve when the valve is in a state compressed; force a second fluid contained in the hermetic connection into the secondary conduit, so that the valve is slightly deformed so that both the primary and secondary fluids can travel through the medical connector to a patient simultaneouslynd. ; inserting the hermetic connection to a second position in the secondary conduit, so that the primary source of fluid can not pass through the valve while establishing fluid communication between the hermetic connection and the patient; withdraw fluid from a patient through the primary and secondary conduits and within the hermetic connection; and removing the hermetic connection, thereby restoring the flow of the primary fluid from the source thereof through the medical connector to the patient.

13. The method in accordance with the claim 12, characterized in that an audible sound is generated when the hermetic connection is inserted in the second position in the secondary conduit.

14. The method of compliance with the 'claim 12, characterized in that the extraction step is conducted after the step of inserting the hermetic connection to a second position.

15. The method in accordance with the claim 12, characterized in that the insertion of a hermetic connection in a first position is conducted before the step of inserting a hermetic connection to a second position.

16. The method according to claim 12, characterized in that the insertion of a hermetic connection in a second position is conducted before the step of inserting a hermetic connection to a first position.

17. The method according to claim 12, characterized in that the extraction step is conducted before the forced stage.

18. The method according to claim 12, characterized in that the forcing step is conducted before the extraction step.