Infusion connector capable of preventing blood return

Abstract

A blood return prevention infusion connector comprises a connector upper cover and a connector base, a blocking elastic piece is arranged in a flow channel between the connector upper cover and the connector base, a first water blocking sleeve is fixed to the connector base or the connector upper cover, the top of the first water blocking sleeve is a protrusion, and a plurality of first gaps are distributed in the wall of the first water blocking sleeve. The inside and outside of the first water-blocking sleeve are communicated through the first gap; a positioning ring is fixed on the connector base or the connector upper cover, a blocking ring is fixed on the lower surface of the positioning ring, a blocking elastic piece is located between the blocking ring and the protrusion, and the lower surface of the blocking elastic piece makes contact with the protrusion. The blood return preventing device has the advantages that compared with the prior art, the blood return preventing component comprises the blocking ring and the blocking elastic piece, the blocking channel is annular, the blocking channel is one component, the pressure difference between opening and closing can be large, and the manufacturing difficulty is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical devices, and particularly relates to an anti-blood backflow infusion connector. Background Art

[0002] Currently, the infusion sets used for intravenous infusion in domestic medical institutions are typically disposable infusion sets. These are sterile medical consumables that establish a passage between the vein and the medication solution. Conventional infusion sets typically consist of a needle (such as a disposable IV needle or an IV catheter), a protective cap, an infusion hose, a medication filter, a flow regulator, a Murphy's dropper, a bottle stopper puncture device, and an air filter connected to the inlet pipe. These sets are primarily used for clinical gravity-fed infusions and play a positive role in preventing cross-infection during the infusion process.

[0003] In order to prevent blood backflow, a new type of anti-blood backflow infusion connector has been developed, such as the Chinese patent document with publication number CN207768824U.

[0004] The blood backflow prevention component in this patent document is an elastic barrier sheet 30, which utilizes the opening and closing of the "liquid passage" provided thereon to achieve the circulation of the liquid medicine and the prevention of blood backflow.

[0005] The pressure required to control the opening and closing of the liquid port needs to be very "precise" (that is, the pressure difference between opening and closing is very small), and the "precision" is related to the material of the elastic barrier 30. If the material elasticity is too large, the liquid may not open the "liquid port" during infusion and infusion may not be possible; if the material elasticity is too small, the "liquid port" may not close when no infusion is taking place and "blood backflow prevention" may not be achieved. Utility Model Content

[0006] The technical problem to be solved by the utility model is: how to design an anti-blood backflow infusion connector and reduce the manufacturing difficulty.

[0007] The specific plan is as follows:

[0008] A blood backflow prevention infusion connector, comprising a connector cover and a connector base, a blocking elastic sheet is provided in a flow channel between the connector cover and the connector base, a first water-blocking sleeve is fixed to the connector base or the connector cover, the top of the first water-blocking sleeve is a protrusion, and a plurality of first slits are distributed on its cylinder wall, the first slits communicating the inside and outside of the first water-blocking sleeve; a positioning ring is fixed to the connector base or the connector cover, a blocking ring is fixed to the lower surface of the positioning ring, the blocking elastic sheet is located between the blocking ring and the protrusion, and its lower surface contacts the protrusion. When there is no external force, its upper surface is in sealing contact with the blocking ring, and the contact position of the blocking elastic sheet with the protrusion is closer to the center of the blocking elastic sheet than the contact position with the blocking ring.

[0009] The outer edge of the blocking elastic piece is further outward than the position where the blocking elastic piece contacts the blocking ring.

[0010] The contact position between the blocking elastic piece and the protrusion is centrally arranged or eccentrically arranged.

[0011] The first gap is an exhaust channel.

[0012] A liquid storage cavity is formed between the joint upper cover and the positioning ring.

[0013] The contact position between the blocking elastic piece and the protrusion bulges upward, so that the blocking elastic piece is arched.

[0014] The second water-blocking sleeve is fixed on the upper surface of the positioning ring, and a plurality of second slits are distributed on the wall of the sleeve. The second slits connect the inside and outside of the second water-blocking sleeve, and the second slits serve as exhaust channels.

[0015] An exhaust port is provided on the upper surface of the joint upper cover, and a circle of exhaust grooves is provided on the inner end surface of the exhaust port and a water-blocking exhaust film is fixed thereon.

[0016] The outer end of the water-blocking and exhaust membrane can be connected to an exhaust plug.

[0017] Beneficial effect: Compared with the prior art, the anti-blood backflow component of the utility model is composed of two components, a blocking ring and a blocking elastic sheet, and the blocking channel is also annular. Now that the blocking channel is one component, the pressure difference between opening and closing can be relatively large, reducing the manufacturing difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the present utility model.

[0019] Figure 2 yes Figure 1 An enlarged schematic diagram of the blocking elastic sheet.

[0020] Figure 3 It is a schematic diagram of the present utility model.

[0021] Figure 4 yes Figure 1 Schematic cross-section of the water-blocking sleeve. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the present invention.

[0023] like Figure 1-2A blood-backflow prevention infusion connector includes a connector cover 1 and a connector base 5. A blocking elastic sheet 4 is provided in the flow channel between the connector cover 1 and the connector base 5. A first water-blocking sleeve 5-1 is fixed on the connector base 5 or the connector cover 1. The top of the first water-blocking sleeve 5-1 is a protrusion 5-2. A plurality of first slits 5-3 are distributed on the wall of the sleeve. The first slits 5-3 connect the inside and outside of the first water-blocking sleeve 5-1 (see Figure 4 ).

[0024] A positioning ring 3 is fixed on the connector base 5 or the connector upper cover 1, and a blocking ring 3-2 is fixed on the lower surface of the positioning ring 3. The blocking elastic sheet 4 is located between the blocking ring 3-2 and the protrusion 5-2, and its lower surface is in contact with the protrusion 5-2. When there is no external force, its upper surface is in sealed contact with the blocking ring 3-2. Relative to the contact position with the blocking ring 3-2, the contact position of the blocking elastic sheet 4 and the protrusion 5-2 is closer to the center of the blocking elastic sheet 4, and the outer edge of the blocking elastic sheet 4 is further outward than the position where it contacts the blocking ring 3-2.

[0025] The contact position between the blocking elastic piece 4 and the protrusion 5-2 can be set in the center (such as Figure 2 ), or an eccentric setting (not shown). A centered setting makes production easier, while an eccentric setting makes it easier for the liquid to pass through.

[0026] As shown Figure 1 and Figure 3 A liquid storage cavity 6 is formed between the joint cover 1 and the positioning ring 3 for slowly storing the liquid medicine and removing air.

[0027] To facilitate exhaust, the first gap 5-3 serves as an exhaust channel. The exhaust channel is narrow enough that, when the external liquid pressure of the first water-blocking sleeve 5-1 is low, the tension cannot be overcome, and liquid cannot pass through, but only gas can pass through. When the external liquid pressure of the first water-blocking sleeve 5-1 is high, both liquid and gas can pass through.

[0028] In order to facilitate sealing, the contact position between the blocking elastic piece 4 and the protrusion 5 - 2 is raised upward, so that the blocking elastic piece 4 is arched.

[0029] like Figure 3 The second water-blocking sleeve 3-1 is fixed on the upper surface of the positioning ring 3, and a plurality of second slits are distributed on the wall of the sleeve. The second slits make the inside and outside of the second water-blocking sleeve 3-1 communicate (see Figure 4 ), the second gap is the exhaust channel mentioned above.

[0030] An exhaust port 1 - 1 is provided on the upper surface of the joint upper cover 1 , and an exhaust groove may be provided on the inner end surface of the exhaust port 1 - 1 and a fixed water-blocking exhaust membrane 2 may be fixed thereto.

[0031] The outer end of the water-blocking and exhaust membrane 2 can be connected to an exhaust plug (not shown in the figure).

[0032] During clinical infusion, pressurization is sometimes required. To prevent leakage of the drug solution due to excessive pressurization, the vent plug must be tightly closed to protect the safety of the drug solution.

[0033] The specific working process of the anti-blood backflow infusion connector is:

[0034] S10, when hydraulic pressure is high:

[0035] S11, the liquid medicine flows downward from the joint cover 1 and first enters the interior of the second water-blocking sleeve 3-1. At this time, the liquid medicine pressure is insufficient and cannot pass through the second slit of the second water-blocking sleeve 3-1, and forms a liquid column in the second water-blocking sleeve 3-1.

[0036] S12: As the liquid medicine continues to enter, the height of the liquid column in the second water-blocking sleeve 3-1 gradually increases. The liquid medicine finally passes through the second slit of the second water-blocking sleeve 3-1 and the outside of the second water-blocking sleeve 3-1. At this time, the liquid medicine flows downward along the outer wall of the second water-blocking sleeve 3-1, gradually expelling the air in the annular space between the second water-blocking sleeve 3-1 and the joint cover 1 through the exhaust. In this way, the air is basically completely exhausted, and it is unlikely that bubbles will remain in the space in the joint cover 1.

[0037] S13, as the height of the liquid column in the second water-blocking sleeve 3-1 gradually increases, the pressure of the liquid on the elastic plate 4 gradually increases until the sealing contact between the elastic plate 4 and the blocking ring 3-2 is broken, and the liquid flows to the outside of the first water-blocking sleeve 5-1, see Figure 2 red arrow.

[0038] During this process, if the contact position of the protrusion 5 - 2 is a biased position, the deformation length of the side farther from the dome of the blocking elastic sheet 4 is greater, and the sealing connection of this difference is more likely to be damaged.

[0039] S14. Referring to the description of S12, the liquid medicine on the outside of the first water-blocking sleeve 5-1 enters the inside through the first slit 5-3. In this way, all the gas between the first water-blocking sleeve 5-1 and the joint base 5 is discharged (from the lower end of the joint base 5).

[0040] S15, the liquid medicine flows out from the lower end of the connector base 5, and the liquid medicine passes through the utility model.

[0041] S20: When the hydraulic pressure is low or the connection of the infusion tube is disconnected:

[0042] When the pressure of the upstream liquid is lost, the sealing contact between the elastic sheet 4 and the blocking ring 3-2 is restored; if blood backflow occurs at this time, a back pressure (pressure from bottom to top) will appear at the sealing contact point, which makes the above-mentioned sealing contact tighter instead of destroying it. In this way, the upward channel is blocked, which can prevent blood backflow; it can also avoid the risk of blood outflow from the patient due to the falling off of the infusion tube connection during the infusion process.

[0043] S25: When air enters the pipe midway:

[0044] When air enters the infusion tube, as long as the hydraulic pressure of the infusion tube is greater than the pressure of the elastic plate 4 and the pressure of the returning blood, the infusion can still be carried out normally until the air in the tube flows into the inner cavity of the connector (inside and outside the liquid storage cavity 6 or the water blocking ring 3-2) and is discharged through the water-blocking exhaust membrane 2, the exhaust groove, and the exhaust window 1-1. This can prevent the air that has entered the infusion tube from entering the blood vessels and avoiding harm to the patient.

[0045] For other details, please refer to the prior art and will not be described in detail.

[0046] The technical means disclosed in the present invention are not limited to those disclosed in the above-mentioned embodiments, but also include technical solutions composed of any combination of the above-mentioned technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. An anti-blood backflow infusion connector, comprising a connector cover (1) and a connector base (5), characterized in that: A blocking elastic sheet (4) is provided in the flow channel between the joint upper cover (1) and the joint base (5); a first water-blocking sleeve (5-1) is fixed on the joint base (5) or the joint upper cover (1); the top of the first water-blocking sleeve (5-1) is a protrusion (5-2); a plurality of first slits (5-3) are distributed on the wall of the sleeve; the first slits (5-3) enable the inside and outside of the first water-blocking sleeve (5-1) to communicate; a positioning ring (3) is fixed on the joint base (5) or the joint upper cover (1); a blocking ring (3-2) is fixed on the lower surface of the positioning ring (3); the blocking elastic sheet (4) is located between the blocking ring (3-2) and the protrusion (5-2), and its lower surface contacts the protrusion (5-2); when there is no external force, its upper surface is in sealing contact with the blocking ring (3-2); and the contact position of the blocking elastic sheet (4) and the protrusion (5-2) is closer to the center of the blocking elastic sheet (4) than the contact position with the blocking ring (3-2).

2. The anti-blood-backflow infusion connector according to claim 1, characterized in that: The outer edge of the blocking elastic sheet (4) is further outward than the position where it contacts the blocking ring (3-2).

3. The anti-blood-back infusion connector according to claim 1, characterized in that: The contact position between the blocking elastic piece (4) and the protrusion (5-2) is centrally arranged or eccentrically arranged.

4. The anti-blood-back infusion connector according to claim 1, characterized in that: The first gap (5-3) is an exhaust channel.

5. The anti-blood-back infusion connector according to claim 1, characterized in that: A liquid storage cavity (6) is formed between the joint upper cover (1) and the positioning ring (3).

6. The anti-blood-backflow infusion connector according to claim 1, characterized in that: The contact position between the blocking elastic piece (4) and the protrusion (5-2) bulges upward, so that the blocking elastic piece (4) is arched.

7. The anti-blood-backflow infusion connector according to claim 1, characterized in that: The second water-blocking sleeve (3-1) is fixed on the upper surface of the positioning ring (3), and a plurality of second slits are distributed on the sleeve wall. The second slits connect the inside and outside of the second water-blocking sleeve (3-1), and the second slits serve as exhaust channels.

8. The anti-blood-back infusion connector according to claim 1, characterized in that: An exhaust port (1-1) is provided on the upper surface of the joint upper cover (1), and an exhaust groove is provided on the inner end surface of the exhaust port (1-1) and a water-blocking exhaust film (2) is fixed thereto.

9. The anti-blood-backflow infusion connector according to claim 8, characterized in that: The outer end of the water-blocking and exhaust membrane (2) can be connected to an exhaust plug.

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