TWM469074U - Needle-free connector module - Google Patents

Description

Needleless connector module (2)

The invention belongs to an injection connector, in particular to a needleless connector module (2) without positive and negative pressure, which has good airtight effect, can avoid air residue and counterflow of medicament.

Conventionally, a syringe is used to inject a drug solution into a syringe or a drip bottle so that the drug can flow into the patient through the catheter or an infusion tube of the drip bottle. However, the conventional syringe is provided with a needle which must be discarded after being used once to avoid problems such as bacterial or bacterial infection, thus causing waste of the needle. Therefore, different types of needle-free connectors have been developed to eliminate the risk of needle discarding and infection, and to eliminate the cost of manufacturing and purchasing needles, which is quite in line with the concept of environmental protection. In addition, many of the needle-free connectors on the market are complicated in structure and expensive, while others have poor airtight and leakproof effects. Furthermore, the syringe is used to inject the drug into the human body through the needle-free connector. If the injection is too fast, the patient may be uncomfortable, and when the needle-free connector is pulled out, the back pressure may also be generated, causing pain. sense.

The reason is that the creator feels that the above-mentioned deficiency can be improved, carefully observed and studied, and in conjunction with the application of the theory, proposes a creation that is reasonable in design and effective in improving the above-mentioned deficiency.

The purpose of the present invention is to provide a needle-free connector module (2), which has the advantages of simple structure, low cost, good airtightness and leakage prevention effect, and at the same time Avoid air residue and countercurrent flow of drugs or blood.

In order to achieve the above purpose, the present invention provides a needle-free connector module (2) for connecting an injection syringe and a guiding tube. The needle-free connector module (2) comprises: a needle-free screw The cap includes a partition plate and a coaming plate connecting the periphery of the partition plate, a surface of the baffle plate is formed with a chemical liquid inflow pipe connecting the pipe; an elastic valve is disposed on the needle-free nut, The elastic valve is internally formed with a cavity, the elastic valve is provided with a backflow prevention valve body, the top of the elastic valve has a slit above the corresponding anti-backflow valve body; and a filling cap is disposed outside the elastic valve And aligning with the needle-free nut, the medicating cap has an opening for inserting the syringe and a hollow cavity communicating with the opening; wherein the injection syringe is inserted into the opening and compresses the elasticity In the valve, the top of the elastic valve is flexibly deformed in the hollow cavity, the injection needle abuts against and spreads the slit, and the liquid in the injection cylinder passes through the anti-backflow valve body to enter the Said inside the guide tube.

The creation has the following effects: the creation of the needle-free connector module (2) has only three components of a needle-free nut, an elastic valve, and a medicated cap, so the structure is simple and the cost is reduced; moreover, all three components are It can be molded and easily assembled, thus greatly reducing manufacturing and assembly man-hours. In addition, the creation of the anti-backflow valve body has excellent closing elasticity, so that the medicament or blood can pass through the anti-backflow valve body through gravity without backflow, so as to achieve excellent airtightness and leakage prevention effect.

In order to further understand the features and technical contents of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings are only for reference and explanation, and are not intended to limit the creation.

The detailed description and technical content of the present invention will be described below with reference to the drawings, however, the drawings are for illustrative purposes only, and the following examples refer to the number or the like, unless otherwise stated. The scope of application should not be limited by its number or the like.

[First Embodiment]

Referring to FIG. 1 to FIG. 5, the present invention provides a needle-free connector module (2) 1 for connecting an injection syringe S and a guiding tube (not shown). The needle-free connector module (2) 1 includes: a needle-free nut 10, an elastic valve 20, and a medicated cap 30. As shown in FIG. 1 and FIG. 5, the needle-free nut 10 and the medicated cap 30 are assembled with each other, and the elastic valve 20 is received between the needle-free nut 10 and the medicated cap 30; 10 includes a partition plate 101 and a surrounding plate 102 connecting the periphery of the partition plate 101. A surface of the partition plate 101 is formed with a chemical liquid inflow pipe 103 connecting the guide tubes.

A cavity 201 is formed in the interior of the elastic valve 20, and the elastic valve 20 is provided with a backflow prevention valve body 202. Since the top of the elastic valve 20 has a longitudinal slit SL above the corresponding anti-backflow valve body 202, and the slit SL has a closed state and a distracted state, the elastic valve 20 maintains the preset shape without being subjected to an external force. The slit SL can be in a hermetically sealed state, and the anti-backflow valve body 202 is also maintained in a closed state, so the two-layer sealing protection of the elastic valve 20 can effectively block the entry of the external air or medicament into the needle-free connector module (2) 1 to maintain the sterility of the elastomeric valve 20. As shown in FIG. 2, when the injection syringe S presses the elastic valve 20, the elastic valve 20 is flexibly deformed in the hollow cavity 302 and the injection syringe S abuts against the slit SL, so that the injection syringe S can be made. Corresponding to the anti-backflow valve body 202, when the liquid in the injection syringe S is applied, the liquid in the injection syringe S passes through the gravity of the liquid to automatically pass the liquid through the anti-backflow valve body 202, thereby entering the guiding tube. Inside; where, when the liquid passes through the reversal After the flow valve body 202, since the backflow prevention valve body 202 itself has the closing tension of the anti-backflow valve body pushing downward, the backflow prevention valve body 202 is automatically closed, so that the elastic valve 20 can be effectively pressed to achieve the needle-free period. Zero negative pressure effect.

The medicine cap 30 is placed outside the elastic valve 20 and is assembled with the needle-free nut 10. The medicine cap 30 has an opening 301 for inserting the injection syringe S and a hollow cavity 302 communicating with the opening 301. Since the elastic valve 20 is sleeved in the hollow cavity 302, when the injection syringe S presses the elastic valve 20 to flex the elastic valve 20 in the hollow cavity 302, it comes from the inner wall of the elastic valve 20 and the medicating cap 30. The relative pressure and the elastic restoring force of the elastic valve 20 itself can also enhance the forward pressure of the elastic valve 20 and enhance the effect of zero needle-free negative pressure.

In summary, the present needle-free connector module (2) 1 has only three components of the needle-free nut 10, the elastic valve 20, and the medicating cap 30, and the above components can be molded and easily assembled. With the combination, it not only can greatly shorten the manufacturing and assembly man-hours, but also has a simple structure, can reduce the production cost, and has economic benefits to improve market competitiveness. The first embodiment of the present creation will be described in detail below.

Please refer to FIG. 1 and FIG. 2 . FIG. 1 is an exploded perspective view of the first embodiment of the needle-free connector module ( 2 ), and FIG. 2 is the first implementation of the creative needle-free connector module ( 2 ). An exploded perspective view of another example; the needle-free nut 10 of the present invention is a rigid plastic molding type, and a surface of one of the partitions 101 is formed with a chemical liquid inflow pipe 103. As can be seen from Fig. 1, the partition plate 101 is circular, and the partition plate 102 is also circular. The chemical liquid inflow pipe 103 is formed on the lower surface of the partition plate 101 and extends downward; the outer diameter of the chemical liquid inflow pipe 103 Corresponding to the inner diameter of the guiding tube, the guiding tube can be tightly placed at the mouth of the liquid chemical inflow tube 103.

The elastic valve 20 can be made of soft plastic, silicone or rubber material, but not In this embodiment, the elastic valve 20 is disposed on the needle-free nut 10, and the combination of the anti-backflow valve body 202 and the cavity 201 of the elastic valve 20 may be integrally formed or combined. In this embodiment, The backflow prevention valve body 202 is integrally formed in the middle of the cavity 201 to form a first content cavity 201a and a second content cavity 201b in the separation cavity 201, so that the slit SL is radially connected to the first content cavity 201a and The second content chamber 201b, in other words, the first content chamber 201a and the second content chamber 201b are perpendicular to each other, so that the cavity 201 is vertically connected from top to bottom.

It should be noted that the anti-backflow valve body 202 of the elastic valve 20 for separating the first content cavity 201a and the second content cavity 201b may have one end of the planar structure and the arc-shaped structure. The end portion of the counter-flow valve body 202 may have at least one notch, so that the anti-backflow valve body 202 is a one-way valve (not shown) having a dot or mesh-like notch, or the end of the anti-backflow valve body 202 is cut. A backing 202a is provided, so that the backflow prevention valve body 202 is a one-way valve having at least one valve; in the specific embodiment, as shown in FIG. 1 and FIG. 2, the end of the backflow prevention valve body 202 is a medicine. The liquid inflow pipe 103 has an arc-shaped structure, and a cross-shaped slit notch 202a is cut in the end portion, so that the backflow prevention valve body 202 is a four-valve one-way valve, but actually by a double valve, The three-valve or five-valve one-way valve can also produce anti-backflow effect, so the one-way valve changes that are familiar to those skilled in the relevant art should belong to the scope of application of this creation. The slit notch 202a of the anti-backflow valve body 202 is equal in cutting depth to form four straight-closed flaps, and the slits 202a between the four flaps are in a normal state, and have anti-backflow. The closing tension of the valve body 202 itself is pushed downward, which forms a very good closing elasticity and achieves a very good airtight effect. When the liquid (such as a medicament) in the syringe S flows through the first In a content chamber 201a, the liquid can smoothly enter the second content chamber 201b through the anti-backflow valve body 202 due to gravity, but the liquid cannot flow back to the first content chamber 201a from the end of the anti-backflow valve body 202 to maintain the second content. The cavity 201b is cleaned, and when the compressed elastic valve 20 rebounds due to the elastic restoring force, the air return pressure can be prevented from being increased too quickly by the rebound, and the pain of the patient can be alleviated.

Referring to FIG. 1 and FIG. 2, a ring-shaped inclined surface 104 which is tapered from the outside and the inside is formed at the intersection of the needle-free nut 10 and the chemical liquid inflow pipe 103, and the maximum outer diameter of the ring slope 104 is equal to the inside of the cavity 201. In the present embodiment, the maximum outer diameter of the ring slope 104 is equal to the inner diameter of the second content chamber 201b, so that the cavity 201 of the elastic valve 20 can be completely and seamlessly sleeved over the liquid chemical inflow pipe 103. Therefore, when the liquid in the syringe S enters the second content chamber 201b through the backflow prevention valve body 202, it can smoothly slide into the chemical liquid inflow pipe 103 along the ring slope 104 without leaking. In addition, the top of the elastic valve 20 is substantially cylindrical and has a slit SL formed above the corresponding anti-backflow valve body 202; the outer surface of the elastic valve 20 is formed with a vertical section 203, a tapered section 204 connecting the vertical section 203, An abutting section 205 connecting the tapered section 204 and the abutting section 205 are connected. The bottom edge contour of the abutment section 205 is substantially equal to the contour of the partition 101, whereby the resilient valve 20 can be stably seated on the partition 101 without causing the lower end of the elastic valve 20 to slip.

Please refer to FIG. 1 and FIG. 4 together. FIG. 4 is a cross-sectional view of the first embodiment of the needle-free connector module (2). The medicated cap 30 is molded of a hard plastic material, which can be clearly seen from FIG. The contour of the upper half of the inner wall of the applicator cap 30 corresponds to the contour of the tapered section 204 of the elastic valve 20 and the abutment section 205, thereby increasing the airtightness and leakage prevention effect. In addition, due to the arrival of the elastic valve 20 The post 205 is a trapezoidal structure that provides a space for elastic deformation when the abutment section 205 is pushed and elastically deformed. On the other hand, since the outer diameter of the abutment section 205 abuts against the inner wall of the applicator cap 30, the design of the trapezoidal structure contributes to the small amount existing between the outer wall of the abutment section 205 and the inner wall of the applicator cap 30. The gas has a space for squeezing movement.

Please refer to FIG. 5. FIG. 5 is a schematic diagram of the use of the first embodiment of the needle-free connector module (2). The operation principle of the needle-free connector module (2) 1 of the present invention will be described below. When the present invention is used, when the syringe S of the needleless seat is pressed down the elastic valve 20, the elastic valve 20 is forced to compress downward, and the needle will abut against the slit SL. After the medical staff pushes the push rod of the injection syringe S to pass the first content chamber 201a, the anti-backflow valve body 202 is opened by the gravity of the fluid itself, thereby causing the fluid to flow into the second The content chamber 201b is further passed through the drug solution inflow tube 103 into the guide tube and then into the patient.

[Second embodiment]

Please refer to FIG. 6A and FIG. 6D , FIG. 6A is an exploded perspective view of the second embodiment of the creation of the needle-free connector module (2), and FIG. 6B is a second embodiment of the creation of the needle-free connector module (2). An exploded perspective view of another variation, FIG. 6C is an exploded perspective view of a second embodiment of the creation of the needle-free connector module (2), and FIG. 6D is a needle-free connector. A perspective exploded view of a further variation of the second embodiment of the group (2). The difference between the embodiment of FIG. 6A and FIG. 6D is that the backflow prevention valve body 202 is disposed on the bottom surface of the cavity 201, and the combination of the backflow prevention valve body 202 and the cavity 201 of the elastic valve 20 is The integrally formed one; wherein the backflow prevention valve body 202 can be one of a planar structure (FIG. 6A) and an arc-shaped structure (FIG. 6B to FIG. 6D).

As shown in FIG. 6A, the backflow prevention valve body 202 is a planar structure integrally formed on the bottom surface of the cavity 201; as shown in FIG. 6B, the backflow prevention valve body 202 is a circle formed in the direction of the chemical liquid inflow pipe 103. The arc-shaped structure, as shown in Fig. 6C, is an arc-shaped structure in which the backflow prevention valve body 202 is formed to protrude toward the slit SL. In addition, as shown in FIG. 6D, the anti-backflow valve body 202 may further include two anti-reverse flow valves 202b and a lower anti-backflow valve 202c disposed above and below, and the upper anti-backflow valve 202b and the lower anti-backflow valve 202c each correspond to the radial direction. The slit SL has an arc-shaped structure in which the upper backflow prevention valve 202b is formed to protrude in the direction of the slit SL, and the lower backflow prevention valve 202c has an arc-shaped structure which is formed to protrude toward the chemical liquid inflow pipe 103. The end of the anti-backflow valve body 202 (Figs. 6A to 6C), the end of the upper anti-backflow valve 202b (Fig. 6D) and the end of the lower anti-backflow valve 202c (Fig. 6D) are more tangible. For example, the notch 202a may be a cross-shaped slit notch 202a, and the anti-backflow valve body 202, the upper anti-backflow valve 202b and the lower anti-backflow valve 202c are four-valve one-way valves.

It should be noted that, as shown in FIGS. 6A to 6D, since the counter flow valve body 202 is integrally formed on the bottom surface of the cavity 201, the structure is simple and easy to process, and the advantages of manufacturing man-hour and cost can be saved. In addition, as shown in FIG. 6B, since the backflow prevention valve body 202 is formed to protrude from the cavity 201 of the elastic valve 20 toward the chemical liquid inflow pipe 103, and the outer diameter of the arc-shaped structure of the backflow prevention valve body 202 is equivalent to the medicine. The liquid flows into the inner diameter of the ring slope 104 of the tube 103, so that the elastic valve 20 can be accurately positioned on the needle-free nut 10 through the backflow prevention valve body 202, so that the elastic valve 20 can more stably stand on the partition 101 without The lower end of the elastic valve 20 is caused to slip; likewise, the lower anti-backflow valve 202c in FIG. 6B also flows from the cavity 201 of the elastic valve 20 toward the liquid medicine. The tube 103 is convexly formed, and the outer diameter of the arc-shaped structure of the lower backflow prevention valve 202c corresponds to the inner diameter of the ring slope 104 of the chemical liquid inflow pipe 103, so that the elastic valve 20 can be stably positioned at the needle-free nut. 10.

[Third embodiment]

Please refer to FIG. 7A to FIG. 7D , FIG. 7A is an exploded perspective view of the third embodiment of the creation of the needle-free connector module (2), and FIG. 7B is a third embodiment of the creation of the needle-free connector module (2). FIG. 7C is an exploded perspective view of a third embodiment of the creative needle-free connector module (2), and FIG. 7D is a creative needle-free connector module. (2) An exploded perspective view of a further variation of the third embodiment. The difference between the embodiment of FIG. 7A and FIG. 7C is that the backflow prevention valve body 202 is disposed in combination on the bottom surface of the cavity 201; wherein the backflow prevention valve body 202 includes a positioning body 202d having a specific thickness. And a backflow prevention valve 202e corresponding to the slit SL and disposed on the positioning body 202d, and the backflow prevention valve 202e may be one of a planar structure (FIG. 7A) and an arc-shaped structure (FIGS. 7B to 7C). The difference between the embodiment of FIG. 7D and the second embodiment is that the backflow prevention valve body 202 is disposed in combination on the bottom surface of the cavity 201, and the backflow prevention valve body 202 includes a positioning body 202d having a specific thickness and two The upper anti-backflow valve 202b and the lower anti-backflow valve 202c are disposed above and below, wherein the upper anti-backflow valve 202b and the lower anti-backflow valve 202c each vertically correspond to the slit SL, and the upper anti-backflow valve 202b and the lower anti-backflow valve The 202c may be one of a planar structure (not shown) and an arc-shaped structure (FIG. 7D). For example, the upper backflow prevention valve 202b may be an arc-shaped structure protruding toward the slit SL, and The lower backflow prevention valve 202c may be an arc-shaped structure that is formed to protrude toward the chemical liquid inflow pipe 103.

The end of the above anti-backflow valve 202e (Fig. 7A to Fig. 7C), the upper defense The end of the counterflow valve 202b (Fig. 7D) and the end of the lower anti-backflow valve 202c (Fig. 7D) can be further provided with a notch 202a above the slit. For example, the notch 202a can be a cross type. The notch 202a is slit so that the backflow prevention valve 202e, the upper backflow prevention valve 202b, and the lower backflow prevention valve 202c are four-valve one-way valves.

It should be noted that, as shown in FIG. 7A, since the outer diameter of the positioning body 202d is equal to the inner diameter of the shroud 102 of the needle-free nut 10, and the backflow prevention valve 202e has a thickness, the backflow prevention valve 202e can be stably Mounted on the partition 101, the slit SL of the elastic valve 20 is accurately and vertically communicated perpendicularly to the slit notch 202a and the chemical solution inflow pipe 103. In addition, since the height of the shroud 102 of the needle-free nut 10 is greater than the thickness of the anti-backflow valve 202e, the elastic valve 20 can be firmly abutted against the positioning body 202d and the bottom end of the elastic valve 20 can be accommodated in the needle-free nut 10 It is not easy to shake inside.

Further, as shown in FIG. 7B, since the backflow prevention valve body 202 is formed to protrude from the positioning body 202d toward the chemical liquid inflow pipe 103, the outer diameter of the arc-shaped structure of the backflow prevention valve body 202 corresponds to the chemical liquid inflow pipe 103. The inner diameter of the ring slope 104, so that the elastic valve 20 can be stably positioned in the needle-free nut 10 through the anti-backflow valve body 202 on the one hand, and the elastic valve 20 abuts against the backflow prevention valve body 202 on the other hand. When the outer diameter of the bottom end of the elastic valve 20 and the outer diameter of the positioning body 202d both correspond to the inner diameter of the shroud 102, the slit SL can be accurately corresponding to the anti-backflow valve 202e and communicated with the chemical liquid inflow pipe. 103.

Further, as shown in FIG. 7C, since the backflow prevention valve 202e is formed on the surface of the positioning body 202d in the direction of the slit SL, the cavity 201 of the elastic valve 20 can be accurately sleeved on the backflow prevention valve 202e. The outer periphery of the arc-shaped structure allows the elastic valve 20 to be firmly coupled to the positioning body 202d. In other words, the anti-backflow valve body 202 between the elastic valve 20 and the needle-free nut 10 can not only accurately position the elastic valve 20 to the needle-free nut 10, but also enable the elastic valve 20 to pass through the positioning body 202d more stably. Standing on the partition 101.

Moreover, as shown in FIG. 7D, this embodiment combines the advantages of the above-described embodiments of FIGS. 7B and 7C, and thus will not be described herein.

It is worth mentioning that, in the second and third embodiments (Fig. 6A to Fig. 7D) of the present invention, the backflow prevention valve body 202 is disposed on the bottom surface of the cavity 201 of the elastic valve 20, so that the backflow prevention valve body 202 (Fig. 6A to 6C), the anti-backflow valve 202e (Figs. 7A to 7C) and the lower backflow prevention valve 202c (Fig. 6D and Fig. 7D) are both moved near the junction of the needle-free nut 10 and the chemical liquid inflow pipe 103; As part of the backflow prevention valve body 202 (Figs. 6A and 6B), part of the backflow prevention valve 202e (Figs. 7A and 7B) and the lower backflow prevention valve 202c (Fig. 6D and Fig. 7D) are all offset. It is attached to the ring slope 104, so that when the liquid flows, the opening width of the backflow prevention valve body 202, the backflow prevention valve 202e and the lower backflow prevention valve 202c is reduced, so that excellent closing elasticity can be effectively formed, which is excellent. The airtight effect not only avoids the patient's pain caused by the rebound of the elastic valve 20, but also effectively achieves the best effect of zero needle-free negative pressure.

In summary, this creation has the following beneficial effects:

1. The needle-free connector module (2) of the present invention has only three components of a needle-free nut, an elastic valve and a medicated cap, so the structure is simple and the cost is reduced; and the above components can be molded. And easy to assemble, so the manufacturing and assembly man-hours are greatly shortened.

Second, the creation of the needle-free connector module (2), which is anti-backflow valve body The end of the end is cut with a cross-shaped slit, each of which has the same depth of cut to form four straight-closed flaps, and has a closed-back valve body self-propelled downwardly closed Tension, achieving very good air tightness.

Third, the creation of the needle-free connector module (2), the creation of the needle-free connector module (2), because the outer contour of the tapered section and the abutment section of the elastic valve is equal to the contour of the inner wall of the filling cap Therefore, when the injection syringe is inserted into the opening of the medicated cap and the elastic valve is squeezed, the tapered section and the abutting section still have a good sealing and abutting effect on the inner wall of the medicated cap, so the airtight leakage prevention effect is equivalent. Excellent.

The above description is only a preferred and feasible embodiment of the present invention, and thus does not limit the scope of the patent of the present invention. Therefore, the equivalent structural changes that are made by using the present specification and the content of the schema are all included in the creation. Within the scope, it is combined with Chen Ming.

1‧‧‧ Needle-free connector module (2)

10‧‧‧ Needle-free nut

101‧‧‧Baffle

102‧‧‧

103‧‧‧Drug flow into the tube

104‧‧‧ring bevel

20‧‧‧Elastic valve

201‧‧‧容容

201a‧‧‧The first content cavity

201b‧‧‧Second content cavity

202‧‧‧Anti-backflow valve body

202a‧‧‧ gap

202b‧‧‧Anti-backflow valve

202c‧‧‧Anti-backflow valve

202d‧‧‧Position body

202e‧‧‧Anti-backflow valve

203‧‧‧ vertical section

204‧‧‧Cone section

205‧‧‧Reward

30‧‧‧Adding Cap

301‧‧‧ openings

302‧‧‧ hollow cavity

S‧‧‧injection syringe

SL‧‧‧Slit

1 is an exploded perspective view of a first embodiment of a needle-free connector module (2); FIG. 2 is an exploded perspective view of another embodiment of a first embodiment of a needle-free connector module (2); 3 is a three-dimensional combination diagram of the first embodiment of the creation of the needle-free connector module (2); FIG. 4 is a cross-sectional view of the first embodiment of the creation of the needle-free connector module (2); FIG. 6A is a perspective exploded view of a second embodiment of a needle-free connector module (2) according to the first embodiment of the present invention; 6B is an exploded perspective view showing another variation of the second embodiment of the creation of the needle-free connector module (2); FIG. 6C is a second embodiment of the creation of the needle-free connector module (2). Figure 3D is a perspective exploded view of a second embodiment of the creation of the needle-free connector module (2); Figure 7A is a third embodiment of the needle-free connector module (2) FIG. 7B is an exploded perspective view showing another variation of the third embodiment of the creation of the needle-free connector module (2); FIG. 7C is a third embodiment of the needle-free connector module (2) 3 is an exploded perspective view of a further variation of the third embodiment; and FIG. 7D is an exploded perspective view of a third embodiment of the creation of the needle-free connector module (2).

1‧‧‧ Needle-free connector module (2)

10‧‧‧ Needle-free nut

101‧‧‧Baffle

102‧‧‧

103‧‧‧Drug flow into the tube

104‧‧‧ring bevel

20‧‧‧Elastic valve

201‧‧‧容容

201a‧‧‧The first content cavity

201b‧‧‧Second content cavity

202‧‧‧Anti-backflow valve body

202a‧‧‧ gap

203‧‧‧ vertical section

204‧‧‧Cone section

205‧‧‧Reward

30‧‧‧Adding Cap

301‧‧‧ openings

SL‧‧‧Slit

Claims (14)

A needle-free connector module (2) is connected to a syringe barrel and a guiding tube, comprising: a needle-free nut, comprising a partition plate and a surrounding plate connecting the periphery of the partition plate, the partition One surface of the plate is formed with a chemical liquid inflow pipe connected to the guiding tube; an elastic valve is disposed on the needle-free nut, and a cavity is formed inside the elastic valve, and the elastic valve is provided with a backflow prevention valve The top of the elastic valve has a slit above the corresponding anti-backflow valve body; and a medicating cap sleeved outside the elastic valve and assembled with the needle-free nut, the medicating cap An opening for inserting the injection syringe and a hollow cavity communicating with the opening; wherein when the injection syringe is inserted into the opening and the elastic valve is pressed, the top of the elastic valve is flexed in the hollow cavity The curvature is deformed, the injection needle abuts against and spreads the slit, and the liquid in the injection cylinder passes through the anti-backflow valve body into the guide tube through gravity. The needle-free connector module (2) of claim 1, wherein the anti-backflow valve system is disposed at a middle portion of the cavity to partition the cavity to form a first content cavity and a second a content cavity, the slit is radially connected to the first content cavity and the second content cavity, and the anti-backflow valve body is one of a planar structure and an arc-shaped structure, and the end head of the anti-backflow valve body has at least one gap. The needle-free connector module (2) of claim 1, wherein the anti-backflow valve system is disposed on a bottom surface of the cavity, the slit is radially connected to the cavity and the liquid chemical inflow pipe The anti-backflow valve body is a planar knot And one of the arc-shaped structures, the end portion of the anti-backflow valve body has at least one notch. The needle-free connector module (2) according to claim 2 or 3, wherein the anti-backflow valve body further comprises two oppositely disposed anti-backflow valves and a lower anti-backflow valve, the upper anti-backflow valve and The lower backflow prevention valve is one of a planar structure and an arc-shaped structure, and the upper backflow prevention valve and the end head of the lower backflow prevention valve have at least one notch. The needle-free connector module (2) according to claim 2 or 3, wherein the anti-backflow valve body and the cavity are combined in a unitary or combined manner. The needle-free connector module (2) according to claim 5, wherein the notch is a notch above a slit. The needle-free connector module (2) of claim 1, wherein the anti-backflow valve system is combined on a bottom surface of the elastic valve, the anti-backflow valve body comprises a positioning body and a pair of slits and a backflow prevention valve disposed on the positioning body, the outer diameter of the positioning body is equal to the inner diameter of the shroud of the needle-free nut, and the anti-backflow valve is one of a planar structure and an arc-shaped structure, and the anti-backflow valve The end head has at least one gap. The needle-free connector module (2) of claim 1, wherein the anti-backflow valve system is combined on a bottom surface of the elastic valve, the anti-backflow valve body comprises a positioning body and two oppositely disposed on the positioning The upper anti-backflow valve and the lower anti-backflow valve, the upper anti-backflow valve and the lower anti-backflow valve respectively correspond to the slit, and the upper anti-backflow valve and the lower anti-backflow valve are both a planar structure and an arc-shaped structure In one of the cases, the upper anti-backflow valve and the end portion of the lower anti-backflow valve have at least one notch. The needle-free connector module (2) according to claim 7 or 8, wherein the notch is a notch above a slit. The needle-free connector module (2) according to claim 1, wherein the needle-free nut and the chemical liquid inflow pipe form a ring-shaped inclined surface which is tapered from the outside to the inside. The needle-free connector module (2) according to claim 10, wherein the maximum outer diameter of the ring slope is equal to the inner diameter of the cavity. The needle-free connector module (2) of claim 11, wherein the outer surface of the elastic valve is formed with a vertical section, a tapered section connecting the vertical section, and an abutment connecting the tapered section. Post. The needle-free connector module (2) of claim 12, wherein the partial contour of the inner wall of the medicating cap corresponds to the tapered section and the abutting section, and the abutting section has A gradient, the outer diameter of the abutting section is smaller than the inner diameter of the medicating cap, so that the abutting section is flexibly deformed in the hollow cavity. The needle-free connector module (2) according to claim 13, wherein the bottom edge contour of the abutment section is equal to the contour of the partition so that the elastic valve stands on the partition.