CN210159009U - Positive pressure needle-free infusion joint - Google Patents

Abstract

The utility model belongs to the field of infusion apparatus, in particular to a positive-pressure needle-free infusion joint, which comprises a joint shell and an elastic sealing element, wherein the periphery of the lower end of the lower base part of the elastic sealing element is provided with an annular base, a liquid medicine circulation interval is reserved between the periphery of the whole lower base part and the inner wall of the joint shell, a pressing ring made of hard material is arranged above the annular base, the pressing ring is sleeved on the lower base part, pressing teeth are uniformly distributed on the periphery of the pressing ring, limiting steps are arranged on the inner wall of the joint shell corresponding to the pressing teeth, the limiting steps limit the pressing ring from the upper part, and a circulation port formed between the pressing teeth is not sealed by the limiting; the pressing ring and the lower base clamp and fix the annular base. Connect the long and thin runner that supplies the liquid medicine circulation of design on connecting shells inner wall with traditional infusion and compare, the utility model discloses in the use, the liquid medicine can be more smooth and easy flow through down the cavity between basal portion and the joint casing, to a great extent has reduced the production of bubble, helps the discharge of bubble simultaneously.

Description

Positive pressure needle-free infusion joint

Technical Field

The utility model relates to a malleation needleless infusion connects belongs to the infusion apparatus field.

Background

At present, the needleless infusion joint can avoid repeated puncture by using a needle, so the needleless infusion joint has the advantages of reducing the pain of a patient and avoiding the puncture of medical staff by the needle, and is widely applied to the intravenous infusion process.

Chinese patent application No. CN201811003243.5 discloses a positive pressure needleless infusion connector, in which the volume of the inner cavity of the lower base is controlled by an elastic sealing body and an inner supporting body, and during the infusion process, the volume of the inner cavity of the lower base gradually decreases until constant, so that the flow rate of the input liquid medicine is kept stable, after the infusion is finished, the volume of the inner cavity of the lower base gradually increases until the original position is restored, and the infusion connector keeps positive pressure or micro positive pressure, thereby effectively preventing blood backflow and ensuring the safety of use. However, in the practical application process, the liquid medicine flows into the liquid medicine flow channel in the lower base through the long and thin side wall flow channel of the upper shell in the joint shell and then enters the liquid conveying pipe, so that air bubbles in the liquid medicine are easily retained in the side wall flow channel of the upper shell, exhaust is incomplete, and potential safety hazards exist in the use process.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: overcomes the defects in the prior art, provides a positive pressure needleless infusion joint with smooth liquid medicine circulation, less bubble generation and easy discharge, can maintain positive pressure or micro positive pressure in the using process, and can effectively prevent blood from flowing back.

The positive-pressure needleless infusion joint comprises a joint shell and an elastic sealing element, wherein the joint shell is formed by connecting an upper shell and a lower base, a liquid medicine flow passage and a gas passage which are communicated with the outside are arranged in the lower base, the elastic sealing element is positioned in the joint shell, is a hollow cylinder and consists of an upper neck part and a lower base part, the top of the upper neck part is provided with a gap which can be opened and closed, and the side surface of the upper neck part is provided with a side passage; a sealing step is arranged on the inner wall of the joint shell corresponding to the transition position of the upper neck and the lower base; an upper opening body is fixed in the lower inner cavity of the upper neck part and completely separates the upper neck part from the inner cavity of the lower base part; in an initial state, the gap is in a closed state, the transition position abuts against the sealing step tightly, when external force acts on the elastic sealing element from the upper side, the gap is opened, the transition position is separated from the sealing step, the periphery of the lower end of the lower base is provided with an annular base, a liquid medicine circulation interval is reserved between the periphery of the whole lower base (including the annular base of the lower base and the part above the annular base) and the inner wall of the joint shell, a pressing ring is mounted above the annular base and made of hard materials, the pressing ring is sleeved on the lower base, pressing teeth are uniformly distributed on the periphery of the pressing ring, limiting steps are arranged on the inner wall of the joint shell corresponding to the pressing teeth, and the limiting steps limit the pressing ring from the upper side and do not seal a circulation port formed between the pressing; the pressing ring and the lower base clamp and fix the annular base.

The utility model discloses a lower basal portion periphery among the infusion connects and connect and leave liquid medicine circulation interval (leave the cavity promptly) between the shells inner wall, the circulation of liquid medicine is realized through the circulation mouth between clamping ring periphery pressure tooth space simultaneously, consequently need not to set up the long and thin runner of indent at the inner wall that connects the casing, be about to connect shells inner wall design for smooth inner wall can, connect the long and thin runner that supplies the liquid medicine circulation to compare on connecting shells inner wall with traditional infusion, the liquid medicine can be more smooth and easy flow through the cavity between basal portion and the joint casing, to a great extent has reduced the production of bubble, help the discharge of bubble simultaneously.

The utility model discloses a theory of operation process as follows:

when in clinical transfusion, a syringe or other external conical joint is inserted into the positive-pressure needleless transfusion joint from the upper part of the upper shell. At the beginning, the upper end position of the upper neck in the elastic sealing element moves downwards, the inner part of the upper neck is bent outwards under the limiting action of the inner upper opening body, a gap at the top of the upper neck is opened, and the liquid medicine enters the inner cavity of the upper neck through the gap and enters a cavity between the upper neck and the upper shell through a side channel of the upper neck; then, with the insertion of the injector or other external cone joint, the lower base part of the elastic sealing element deforms, the gas in the inner cavity of the lower base part is discharged along the gas channel of the lower base, meanwhile, the transition position of the upper neck part and the lower base part is gradually separated from the sealing step to form a liquid medicine circulation channel, and the liquid medicine enters the cavity between the outer wall of the lower base part and the joint shell through the liquid medicine circulation channel and enters the infusion tube through the circulation port between the pressing teeth on the periphery of the pressing ring and the liquid medicine flow channel in the lower base.

After the infusion is finished, the syringe or other external conical joint is separated from the infusion joint, at the moment, the external force acting on the elastic sealing element from the upper part is eliminated, the upper neck part of the elastic sealing element rises under the action of the self elasticity, and the inner cavity of the lower base part is enlarged until the original position is recovered. In the process, the infusion connector is always kept at positive pressure, so that blood backflow can be prevented, and the use safety is ensured.

When the positive-pressure needle-free infusion joint is designed, the volume of the inner cavity of the lower base part can be further reduced by reducing the outer diameter of the lower base part of the elastic sealing piece, so that the volume of a cavity between the periphery of the lower base part and the inner wall of the joint shell is increased, the volume change of the inner cavity of the lower base part can be reduced, the flow speed of input liquid medicine is basically kept stable, and after infusion is finished, micro positive pressure can be kept in the infusion joint in the resetting process of the lower base part, so that blood backflow is effectively prevented, and the use safety is ensured.

In actual production, the upper shell and the pressing ring can be welded or bonded into a whole.

Preferably, the side channel on the side surface of the upper neck is a normally open channel, and through the structural form, the liquid medicine can smoothly enter the cavity between the upper neck and the upper shell through the inner cavity of the upper neck and the side channel of the upper neck, so that the generation of bubbles is further reduced.

Preferably, the upper neck portion is composed of a small neck portion, a diameter changing portion and a large neck portion from top to bottom, the outer diameter of the large neck portion is larger than that of the small neck portion, the side channel is located on the side face of the large neck portion, and a step is arranged on the inner wall of the upper shell of the diameter changing portion to serve as a sealing limiting piece.

Preferably, the periphery of the upper neck part is provided with a convex ring, the position of the convex ring is higher than the side channel of the upper neck part, and a step corresponding to the convex ring is arranged on the inner wall of the upper shell to be used as a sealing limiting part.

Preferably, the lower part of the upper opening body is provided with a sealing seat, the upper surface of the sealing seat is contacted with the inner top of the lower base part, and the lower base part is provided with a downward convex annular sealing element at a corresponding contact position to realize sealing, so that the inner cavity of the upper neck part and the inner cavity of the lower base part are completely isolated, and the sterilization is more thorough. It is further preferred that the annular seal is integrally formed with the lower base. In practical application, the sealing between the sealing seat and the contact surface of the lower base part can be realized by adopting other modes, for example, an outer convex ring is designed on the upper surface of the sealing seat and is arranged on the lower base part to the sealing groove corresponding to the outer convex ring, the outer convex ring is just clamped in the sealing groove during assembly, the sealing effect can also be achieved, and finally the upper neck part is completely isolated from the inner cavity of the lower base part.

Preferably, the external shape of the transition position of the upper neck part and the lower base part is conical, and the sealing step on the inner wall of the upper shell is chamfered corresponding to the transition position, so that surface contact sealing is realized between the transition position of the upper neck part and the lower base part and the sealing step, and the sealing effect is enhanced.

Preferably, the inner cavity of the lower base is provided with an inner support body, and the height of the inner support body is smaller than the height of the inner cavity of the lower base. The lower base of the elastic sealing element is compressed and deformed under the internal supporting and limiting effect of the internal supporting body, and the lower base is compressed to a certain degree and blocked by the internal supporting body, so that the volume change of the inner cavity of the lower base is effectively controlled, after infusion is finished, micro-positive pressure can be kept in an infusion joint when the lower base is reset, and the use safety is ensured. In practical application, the inner support body can be fixedly connected with the upper opening and closing body, after the inner support body is fixed, an adjusting gap is formed between the inner support body and the lower base, and when external force acts on the elastic sealing element from the upper side, the inner support body moves downwards to support and limit the lower base of the elastic sealing element from the inside, so that the deformation of the lower base is reduced, and a liquid regular channel is formed. The inner supporting body can also be fixedly connected with the lower base, an adjusting gap is formed between the inner supporting body and the inner top of the lower base, when external force acts on the elastic sealing element from the upper side, the inner supporting body still supports and limits the lower base of the elastic sealing element from the inside, and deformation of the lower base is reduced.

Preferably, when the external force acting on the elastic sealing member from above is eliminated, the effective volume change of the inner cavity of the lower diameter-changing part of the elastic sealing member is 0 to 15 μ L, namely, positive pressure or slight positive pressure is maintained in the needleless infusion joint, thereby effectively preventing the blood from flowing back.

Compared with the prior art, the utility model beneficial effect who has is:

1. the utility model discloses a lower basal portion periphery and connect and leave liquid medicine circulation interval between the shells inner wall, realize the circulation of liquid medicine through the circulation mouth between clamping ring periphery pressure tooth simultaneously, connect the long and thin runner that supplies the liquid medicine circulation with traditional infusion and design on connecting shells inner wall, the liquid medicine can be more smooth and easy flow through down the basal portion and connect the cavity between the casing, to a great extent has reduced the production of bubble, helps the discharge of bubble simultaneously.

2. The lower base of the elastic sealing element is compressed and deformed under the internal supporting and limiting effect of the internal supporting body, and the lower base is compressed to a certain degree and blocked by the internal supporting body, so that the volume change of the inner cavity of the lower base is effectively controlled, after infusion is finished, micro-positive pressure can be kept in an infusion joint when the lower base is reset, and the use safety is ensured.

Drawings

FIG. 1 is a schematic structural diagram of an initial state of an embodiment;

FIG. 2 is a schematic view of the first embodiment in an intravenous infusion state;

FIG. 3 is a cross-sectional view of FIG. 1 rotated 90;

FIG. 4 is a schematic diagram of the elastomeric seal of one embodiment;

FIG. 5 is a schematic structural diagram of a lower base in accordance with an embodiment;

FIG. 6 is a cross-sectional view of FIG. 5 rotated 90;

FIG. 7 is a schematic view of the construction of the clamping ring;

FIG. 8 is a schematic view of an elastomeric seal of another construction;

FIG. 9 is a schematic structural diagram of the second embodiment in an initial state.

In the figure: 1. a lower base; 2. a gas channel; 3. an annular base; 4. pressing a ring; 5. an inner support body; 6. a lower base; 7. a sealing seat; 8. an upper opening body; 9. an upper neck portion; 10. an upper housing; 11. a gap; 12. a side channel; 13. fixing the assembly table; 14. an annular seal; 15. a transition location; 16. an outer cone joint; 17. a liquid medicine flow passage; 18. pressing teeth; 19. a convex ring;

9.1, small neck; 9.2, a variable diameter part; 9.3, large neck.

Detailed Description

Embodiments of the present invention are further described below with reference to the accompanying drawings:

the first embodiment is as follows:

as shown in fig. 1 to 7, the positive-pressure needleless infusion connector of the present embodiment includes a connector housing and an elastic sealing member, the connector housing is formed by connecting an upper housing 10 and a lower base 1, a liquid medicine flow passage 17 and an air passage 2 communicating with the outside are formed in the lower base 1, the elastic sealing member is made of an elastic material and is located in the connector housing, the elastic sealing member is a hollow cylinder made of a silica gel material, and is integrally connected by an upper neck 9 and a lower base 6, an openable gap 11 is formed at the top of the upper neck 9, a side passage 12 is formed on a side surface of the upper neck 9, an outer diameter of the lower base 6 is larger than that of the upper neck 9, and a lower end of; a sealing step is arranged on the inner wall of the upper shell 10 corresponding to the transition position 15 of the upper neck part 9 and the lower base part 6 (in an initial state, the transition position 15 of the upper neck part 9 and the lower base part 6 of the elastic sealing element tightly supports against the sealing step, and when external force acts on the elastic sealing element from the upper part, the elastic sealing element is gradually separated from the sealing step to form a liquid medicine circulation channel); an upper opening and closing body 8 is fixed in the lower inner cavity of the upper neck portion 9, the upper neck portion 9 is completely isolated from the inner cavity of the lower base portion 6 through the upper opening and closing body 8, in the embodiment, a fixing assembly table 13 is arranged on the inner wall of the upper neck portion 9, a concave snap ring is arranged on the outer wall of the upper opening and closing body 8 corresponding to the fixing assembly table 13, and the upper opening and closing body 8 is fixedly connected with the upper neck portion 9 in a clamping mode; an inner support body 5 is arranged in the inner cavity of the lower base 6, and the height of the inner support body 5 is smaller than that of the inner cavity of the lower base 6; the periphery of the lower end of the lower base part 6 is provided with an annular base 3, a liquid medicine circulation interval is reserved between the periphery of the whole lower base part and the inner wall of the joint shell, a pressing ring 4 is arranged above the annular base 3, the pressing ring 4 is made of hard materials and is sleeved on the lower base part 1, pressing teeth 18 are uniformly distributed on the periphery of the pressing ring 4, limiting steps are arranged on the inner wall of the joint shell corresponding to the pressing teeth 18, the limiting steps limit the pressing ring 4 from the upper side and do not seal circulation ports formed between the pressing teeth; the pressing ring 4 and the lower base 1 clamp and fix the annular base 3. In the initial state, the slit 11 at the top of the upper neck 9 is in a closed state, and when an external force is applied to the elastic sealing member from above, the slit 11 is opened.

In this embodiment, because the liquid medicine circulation interval (leaving the cavity promptly) is left between the lower basal portion 6 periphery of elastic sealing element and the joint shells inner wall, the circulation of liquid medicine is realized through the circulation mouth between 4 periphery pressure teeth 18 of clamping ring simultaneously, consequently need not to set up the elongated flow path of indent at the inner wall that connects the casing, be about to connect shells inner wall design to smooth inner wall can, connect the elongated flow path that supplies the liquid medicine circulation to compare with traditional infusion on connecting shells inner wall, the liquid medicine can be more smooth and easy the cavity between lower basal portion and the joint shells of flowing through, to a great extent has reduced the production of bubble, help the discharge of bubble simultaneously.

The upper neck part 9 is composed of a small neck part 9.1, a diameter changing part 9.2 and a large neck part 9.3 from top to bottom, the outer diameter of the large neck part 9.3 is larger than that of the small neck part 9.1, the side channel 12 is positioned on the side surface of the large neck part 9.3, the diameter changing part 9.2 corresponds to, a step is arranged on the inner wall of the upper shell 10 and serves as a sealing limiting part, and the step is matched with the diameter changing part 9.2 to realize sealing.

The side channel 12 on the side surface of the upper neck part 9 is a normally open channel, and through the structure, the liquid medicine can smoothly enter the cavity between the upper neck part 9 and the upper shell 10 through the inner cavity of the upper neck part 9 and the side channel 12 of the upper neck part 9, so that the generation of bubbles is further reduced.

The external shape of the transition position 15 of the upper neck 9 and the lower base 6 is conical, and corresponding to the transition position 15, the sealing step on the inner wall of the upper shell 10 is chamfered, so that surface contact sealing is realized between the transition position 15 of the upper neck 9 and the lower base 6 and the sealing step, and the sealing effect is enhanced.

Go up the lower part of body 8 that opens and shuts and have seal receptacle 7, the upper surface of seal receptacle 7 contacts with the interior top of lower base 6, on the contact position that corresponds, is equipped with downward convex annular seal 14 on the lower base 6, realizes sealedly to keep apart completely last neck 9 and lower base 6 inner chamber, make the disinfection more thorough, in this embodiment, annular seal 14 and lower base 6 adopt integrated into one piece.

The inner support body 5 in this embodiment is fixed at the lower base 1, and the two adopt integrated into one piece, and there is the adjustment clearance between the inner top of inner support body 5 and lower base 6, and when external force acted on the elastic sealing element from the top, inner support body 5 still supported spacingly from inside to the lower base 6 of elastic sealing element, reduced the deformation of lower base 6.

When the external force acting on the elastic sealing piece from the upper part is eliminated, the effective volume change of the inner cavity of the lower base part 6 of the elastic sealing piece is 0-15 mu L, namely, the needle-free infusion joint keeps positive pressure or slight positive pressure, and the blood backflow is effectively prevented.

The working principle and process of the embodiment are as follows:

during clinical transfusion, the external conical joint 16 (or a syringe) is inserted into the positive-pressure needle-free transfusion joint from the upper part of the upper shell 10. At the beginning, the upper end position of an upper neck 9 in the elastic sealing element moves downwards, the middle part of the upper neck 9 is bent outwards under the limiting action of an internal upper opening body 8, a gap 11 at the top of the upper neck is opened, and liquid medicine enters an inner cavity of the upper neck 9 through the gap 11 and enters a cavity between the upper neck 9 and an upper shell 10 through a side channel 12 of the upper neck 9; then, with the insertion of the external cone joint 16 (or syringe), the lower base 6 of the elastic sealing element is compressed and deformed under the internal supporting and limiting effect of the internal support body 5, the gas in the inner cavity of the lower base 6 is discharged along the gas channel 2 of the lower base 1, meanwhile, the transition position 15 of the upper neck 9 and the lower base 6 is gradually separated from the sealing step to form a liquid medicine circulation channel, the liquid medicine flows through the side channel 12 of the upper neck 9, the liquid medicine circulation channel enters the cavity between the outer wall of the lower base 6 and the joint housing, and then enters the infusion tube through the circulation port between the peripheral pressing teeth 18 of the pressing ring 4 and the liquid medicine flow channel 17 in the lower base 1

After the infusion is finished, the external conical joint 16 (or the injector) is separated from the positive-pressure needle-free infusion joint, at the moment, the external force acting on the elastic sealing element from the upper part is eliminated, the upper neck part 9 of the elastic sealing element is lifted under the action of the self elastic force, and simultaneously, the lower base part 6 is reset, so that the inner cavity of the lower base part 6 is enlarged until the original position is recovered. In the process, the infusion connector is always kept at positive pressure, so that blood backflow can be prevented, and the use safety is ensured.

In this embodiment, the upper neck 9 of the elastic sealing element may be designed in another form, specifically, as shown in fig. 8, a convex ring 19 is disposed on the periphery of the upper neck 9, the position of the convex ring 19 is higher than the side channel 12 of the upper neck 9, a step is disposed on the inner wall of the upper housing 10 corresponding to the convex ring 19 to serve as a sealing position-limiting element, and the function of the convex ring 19 is the same as that of the diameter-changing portion 9.2 in this embodiment, and both functions as a sealing function.

Example two:

as shown in fig. 9, the structure of the positive-pressure needleless infusion connector of the present embodiment is substantially the same as that of the first embodiment, except that the inner support body 5 is fixed on the sealing seat 7 of the upper opening body 8, and the inner support body 5 and the upper opening body 8 are integrally formed (i.e. the inner support body 5 and the upper opening body 8 are fixedly connected), after the inner support body 5 and the lower base 1 are fixed, an adjustment gap is formed therebetween, so that when an external force acts on the elastic sealing member from above, the inner support body 5 moves downward, and the lower base 6 of the elastic sealing member is supported and limited from inside, so as to reduce the deformation of the lower base 6.

Second embodiment the working principle and process of the positive pressure needleless infusion joint are the same as those of the first embodiment.

Claims (10)

1. A positive-pressure needleless infusion joint comprises a joint shell and an elastic sealing element, wherein the joint shell is formed by connecting an upper shell (10) and a lower base (1), a liquid medicine flow passage (17) and an air passage (2) which are communicated with the outside are arranged in the lower base (1), the elastic sealing element is positioned in the joint shell, is a hollow cylinder and consists of an upper neck part (9) and a lower base part (6), the top of the upper neck part (9) is provided with a gap (11) which can be opened and closed, and the side surface of the upper neck part is provided with a side passage (12); a sealing step is arranged on the inner wall of the joint shell corresponding to the transition position (15) of the upper neck part (9) and the lower base part (6); an upper opening body (8) is fixed in the lower inner cavity of the upper neck part (9), and the upper opening body (8) completely separates the upper neck part (9) from the inner cavity of the lower base part (6); under initial condition, gap (11) are in closed condition, and transition position (15) support tightly sealed step, and when external force acted on elastic sealing element from the top, gap (11) were opened, transition position (15) and sealed step separation, its characterized in that: the periphery of the lower end of the lower base part (6) is provided with an annular base (3), a liquid medicine circulation interval is reserved between the periphery of the whole lower base part and the inner wall of the joint shell, a pressing ring (4) is mounted above the annular base (3), the pressing ring (4) is made of hard materials, the pressing ring is sleeved on the lower base part (6), pressing teeth (18) are uniformly distributed on the periphery of the pressing ring (4), limiting steps are arranged on the inner wall of the joint shell corresponding to the pressing teeth (18), the limiting steps limit the pressing ring (4) from the upper side, and the limiting steps do not block a circulation opening formed between the pressing teeth; the pressing ring (4) and the lower base (1) clamp and fix the annular base (3).

2. The positive pressure needle-free infusion connector of claim 1, wherein: the side channel (12) at the side of the upper neck (9) is a normally open channel.

3. The positive pressure needle-free infusion connector of claim 2, wherein: go up neck (9) top-down by little neck (9.1), reducing portion (9.2) and big neck (9.3) and constitute, the external diameter of big neck (9.3) is greater than little neck (9.1), side passageway (12) are located the side of big neck (9.3), to meeting an emergency footpath (9.2), set up the step on last shell (10) inner wall and regard as sealed locating part.

4. The positive pressure needle-free infusion connector of claim 2, wherein: the periphery of the upper neck (9) is provided with a convex ring (19), the position of the convex ring (19) is higher than the side channel (12) of the upper neck (9), and a step corresponding to the convex ring (19) is arranged on the inner wall of the upper shell (10) to be used as a sealing limit piece.

5. The positive pressure needle-free infusion connector of claim 1, wherein: the lower part of the upper opening body (8) is provided with a sealing seat (7), and the upper surface of the sealing seat (7) is contacted with the inner top of the lower base part (6); in the corresponding contact position, the lower base part (6) is provided with a downwardly projecting annular seal (14).

6. The positive pressure needle-free infusion connector of claim 1, wherein: the outer shape of the transition location (15) is conical; the sealing step on the inner wall of the joint housing is chamfered in correspondence of the transition point (15).

7. The positive pressure needle-free infusion connector according to any one of claims 1 to 6, wherein: an inner support body (5) is arranged in the inner cavity of the lower base (6), and the height of the inner support body (5) is smaller than that of the inner cavity of the lower base (6).

8. The positive pressure needle-free infusion connector of claim 7, wherein: the inner support body (5) is fixedly connected with the upper opening body (8), and an adjusting gap is arranged between the inner support body (5) and the lower base (1).

9. The positive pressure needle-free infusion connector of claim 7, wherein: the inner support body (5) is fixedly connected with the lower base (1), and an adjusting gap is formed between the inner support body (5) and the inner top of the lower base (6).

10. The positive pressure needle-free infusion connector according to any one of claims 1 to 6 or 8 to 9, wherein: when the external force acting on the elastic sealing member from the upper part is eliminated, the effective volume change of the inner cavity of the lower base part (6) of the elastic sealing member is 0-15 mu L.

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