CN100551453C - Indwelling Infusion Device - Google Patents

Abstract

The invention discloses an indwelling transfusion device, which comprises a first dredging tube, a needle-free joint with an inflow end and an outflow end, a second dredging tube, and the second dredging tube is detachably combined with the outflow of the needle-free joint. end and make the second dredging tube communicate with the outflow end of the needleless connector, it is characterized in that the indwelling infusion device further includes an inflow end that detachably connects the first dredging tube and the needleless connector and connects the first dredging tube with the needleless connector Adapter for internal communication of the inflow side of the needleless connector.

Description

Indwelling Infusion Device

technical field

The invention relates to a medical transfusion device, in particular to an indwelling transfusion device which can be used multiple times for one puncture.

Background technique

In the process of disease treatment, it is often necessary to intermittently inject various drugs for several days or even tens of days for critically ill patients. Bitter, and multiple punctures also brought trouble to the work of nurses.

Therefore, in practice, medical staff began to try to indwell the needle end in the patient's blood vessel, while the other end was blocked to prevent blood backflow and bacterial invasion. For example, a medical intravenous injection needle disclosed in Chinese Patent Application No. CN92242107.2 is suitable for patients who need multiple intravenous injections. It consists of a metal lead-in needle, a hose and a connector. The metal lead-in needle is inserted into the hose, and its plastic part is connected to the head of the connector. There is a rubber at the end of the connector. However, there are huge disadvantages in this indwelling infusion method: firstly, blood reflux generally occurs in this method, and the needle will be blocked after blood coagulation, so expensive anticoagulant-heparin sodium must be added; at the same time, the needle wears When passing rubber, rubber debris is often produced, and these debris will flow into the blood of the human body, which will bring unexpected consequences; moreover, the sealing effect of this method is not ideal, which often leads to the invasion of germs, thus causing serious harm to patients. more damage.

With the continuous improvement of medical equipment, a heparin cap appeared. The heparin cap is a needle connector, which is called a needle connector because it requires an injection needle to pierce the sealing silica gel on the heparin cap during infusion to infuse. For example, Chinese patent application No. CN03220931.2 discloses a heparin cap equipped with a rotatable internal thread collar. Connecting hole, the rear part of the Luer outer cone body is provided with a convex ring with a diameter slightly larger than the connecting hole, and the rear part of the convex ring forms a connecting groove; when the internal thread collar is rotated to connect the heparin cap with other medical devices, the Luer outer cone body There is no back rotation, thereby avoiding the phenomenon that the puncture device inserted into the Luer outer cone body falls off and the phenomenon of kinking of the catheter connected to the puncture device can be avoided. Although the connection of the heparin cap is simple and the closure is reliable, the heparin cap has the following disadvantages: 1. It cannot be used for all patients. Some patients cannot use heparin sodium due to their own blood coagulation mechanism, so these patients cannot use heparin caps; 2. Because the needle pierces the sealing silica gel, microorganisms and particles have the opportunity to enter the infusion channel and cause harm to the patient; 3. 1. Increase the cost of infusion, because after each infusion, a syringe needs to be used to inject heparin sodium to seal the tube, which increases unnecessary costs; 4. It will cause harm to medical staff. Stab wounds, especially diseases that may cause cross-infection of blood, will cause more serious injuries to medical staff.

Due to the above-mentioned shortcomings of the heparin cap, the industry has developed a needleless connector. Its working principle is: 1. In the original state, the infusion channel is closed, and the closed position is the entire tapered channel in the upper end of the connector; 2. When the infusion is infused, the syringe is inserted, and the stem is pressed down to let out the infusion channel, and the liquid medicine flows into the infusion pipeline through the channel; 3. After the infusion is completed, the syringe is pulled out, and the stem moves up under the action of the elastic element. Firstly, the tapered channel is closed, and as the stem continues to move upward, the excess medicinal liquid in the connector is continuously pressed to the infusion tube until it returns to the state before the infusion; 4. With the end of the infusion, the pressure in the infusion tube gradually decreases , eventually equilibrates with the venous pressure and forms a droplet at the indwelling needle. As disclosed in Chinese Patent Application No. CN96101068.1, a needle-free multi-dose safety injection device has a main body, an extension side arm and an elastic valve, the extension side arm is connected to one side of the main body, and the valve body is arranged on the main body and against the extension side arm to seal the tubular injection hole at one end of it. When injecting liquid medicine to the patient, the needleless syringe is inserted into the tapered hole of the extension body, and its valve tube is assembled into the liquid channel of the syringe. The pressure of the protruding end of the syringe on the valve body puts the elastic valve body in a compressed position, allowing the liquid medicine to enter the delivery tube of the main body. When there is no pressure, the elastic valve body is in a static position to close the injection channel, so that no air will enter the delivery tube and cause embolism of the patient's blood vessels. The needle-free connector has the following advantages: 1. It is not necessary to inject heparin sodium to seal the tube, so it can be adapted to all patients. 2. Due to the non-destructive sealing, there is no possibility of microbial and particle contamination. 3. It is convenient for disinfection, just wipe the upper end of the joint with disinfectant before each infusion. 4. Because there is no need to inject expensive heparin sodium, the cost of transfusion is reduced. 5. Medical staff do not need needle puncture, which avoids injury to medical staff. 6. The upper end of the joint is equipped with a standard external thread to make the infusion connection more reliable.

Although the needleless connector has many advantages worthy of popularization and application, the structure of the current domestic standard infusion set and the structure of the needleless connector cannot be stably and reliably connected. Those who need indwelling infusion are generally critically ill patients. Once the patient unconsciously tears this unstable connection, the life of the patient will be seriously endangered. That is to say, the needleless connector cannot be directly applied to the occasion of indwelling infusion in a stable and reliable manner.

Therefore, providing a stable and reliable device for indwelling infusion has become a problem to be solved in the industry.

Contents of the invention

The technical problem to be solved by the present invention is to provide an indwelling transfusion device that can stably and reliably use a needleless joint.

A technical solution of the present invention is to provide an adapter for an indwelling infusion set, which is used to detachably connect the first drainage tube of the infusion set to the needle-free connector and connect the first drainage tube to the needle-free connector. The outflow end of the connector is connected, the first drainage tube includes a first positioning part, the needleless connector includes a second positioning part, and the adapter is provided with a first positioning part and a second positioning part respectively fixedly connected to each other. A holding part and a second holding part.

Wherein, after the second positioning part is fixedly connected with the second holding part, the vertical distance from the first holding part to the critical opening position plane of the valve core of the needleless joint is less than or equal to the distance from the first positioning part to the end of the first dredging tube. After the end of the first dredging pipe overcomes the elastic force of the valve core of the needle-free joint and is inserted into the inflow end of the needle-free joint and reaches the critical opening position of the valve core, the first positioning part moves to the lower end of the first holding part, and the first holding part The resistance applied to the first positioning portion is greater than the elastic recovery force of the valve core.

The connection between the first positioning part and the first holding part adopts snap fit, screw fit or interference fit, and the connection between the second positioning part and the second holding part adopts snap fit, screw fit Type fit or interference fit, between the first positioning part and the first holding part, between the second positioning part and the second holding part can adopt the same matching method or different matching methods. Among them, the stop fit includes the stop between the convex rib and the end face, the stop between the step and the end face, the stop between the bump and the end face, etc.; the snap fit can include the fit between the protrusion and the groove, the fit between the hook and the hole, The fit of the buckle and the positioning surface, etc.; the interference fit can include the interference fit of the optical axis and the optical hole, the interference fit with a friction-enhancing structure, and the like.

The preferred method is: the adapter is a hollow shell, including upper and lower parts, the inner diameter of the upper half is slightly equal to the outer diameter of the first positioning part, and the inner diameter of the lower half is slightly equal to the diameter of the inflow end of the needleless connector. Outer diameter, the first holding part is the stop rib provided on the inner wall of the upper half of the shell, the second holding part is the internal thread provided on the inner wall of the lower half of the shell, the upper part of the first positioning part of the first dredging pipe The end surface can be stopped by the lower end surface of the blocking rib, and the second positioning part of the needleless connector is an external thread arranged on the periphery of the inflow end of the needleless connector and can be mated with the internal thread. An injection catheter is provided at the end of the first dredging pipe, and the needleless connector also includes a valve core that closes its inflow end and outflow end. The inflow end is connected to the outflow end. When the external force is removed, the upper end surface of the drug filter is stopped by the lower end surface of the stop rib, and the elastic restoring force of the valve core cannot overcome the stop force, so that the injection of the first dredging tube The inflow end and the outflow end of the catheter and the needleless connector are maintained in mutual communication.

Wherein, at least one longitudinal notch is provided in the upper part of the adapter, which is convenient for disinfection, connection and disassembly. A preferred method is to cut off two sides substantially symmetrically on both sides of the upper half of the adapter.

Another technical solution of the present invention is to provide an indwelling transfusion device, which includes a first drainage tube, a needle-free joint with an inflow end and an outflow end, a second drainage tube, and the second drainage tube is detachable. Combined with the outflow end of the needleless connector and make the second dredging tube communicate with the outflow end of the needleless connector, it is characterized in that the indwelling infusion device further includes an inflow end detachably connecting the first dredging tube and the needleless connector And an adapter piece that communicates with the inflow end of the first dredging tube and the needleless connector.

Wherein, the first dredging tube includes a first positioning part, the needleless joint includes a second positioning part, and the adapter part includes a first holding part and a first positioning part respectively fixedly connected with the first positioning part and the second positioning part. Two holding parts, the connection between the first positioning part and the first holding part adopts snap fit, screw fit or interference fit, and the connection between the second positioning part and the second holding part adopts buckle fit, screw fit or interference fit.

Preferably, the adapter is a hollow shell, including upper and lower parts, the inner diameter of the upper part is slightly equal to the outer diameter of the drug filter, and the inner diameter of the lower part is slightly equal to the outer diameter of the inflow end of the needleless connector. The first positioning part is the medicine filter arranged on the first dredging pipe, the second positioning part is the external thread arranged on the outer circumference of the inflow end of the needleless connector, and the first holding part is the stop protrusion provided on the inner wall of the adapter housing The second holding part is an internal thread provided on the inner wall of the adapter housing. The upper end surface of the medicine filter of the first dredging pipe can be stopped by the lower end surface of the stopper rib, and the external thread of the needleless connector can be connected with the rotating The internal threads of the connectors are connected to each other.

After the external thread and the internal thread are screwed together, the adapter and the needleless joint are connected and fixed together. When the injection catheter presses the valve core and is inserted into the inflow end under the action of external force, the drug filter gradually contacts with the inner wall of the first holding part. Elastic deformation occurs between the ribs, causing the first holding part to expand to the periphery until the upper end surface of the drug filter moves below the blocking rib on the inner wall of the first holding part of the adapter, and the inflow end of the injection catheter and the needleless connector At this time, the elastic recovery of the first holding part moves closer to the center, so that the upper end surface of the drug filter is stopped by the lower end surface of the stop rib on the inner wall of the first holding part. After the external force is stopped, the elastic force of the valve core cannot overcome The resistance of the stop rib makes the drug filter pass over the stop rib, so that the injection catheter is kept in a state of communicating with the inflow end and the outflow end of the needleless connector.

When an external force is applied to pull out the injection catheter, the external force can overcome the resistance of the blocking ridge and make the drug filter pass over the blocking ridge, so that the injection catheter gradually withdraws from the inflow end of the needleless joint, and the valve core will return to the inflow end. In the state of being blocked with the outflow end, the needleless connector is closed from the outside world.

However, the first positioning part may also be other special structures other than the medicine filter. For example, a positioning block arranged on the first dredging pipe, and the positioning block can be circular, polygonal, wedge-shaped, spherical, and other irregular shapes, so that the inner cavity of the upper half of the adapter is also correspondingly arranged to shape.

The connection between the first dredging tube and the inflow end of the needle-free joint, and the connection between the second dredging tube and the out-flow end of the needle-free joint are all sealed connections.

The beneficial effects of the present invention are: to provide an adapter to effectively establish a stable and reliable connection between the needle-free connector and the standard infusion set, so that the more advanced needle-free connector can be used more widely; at the same time, the above-mentioned adapter The parts effectively avoid the risk of falling off of the needleless connector and the infusion set, and guarantee the life and health of the patient.

The present invention will be further described below in conjunction with the examples, but the present invention is not limited to these examples, and any improvement or substitution on the basic spirit of the present invention still belongs to the scope of protection claimed in the claims of the present invention.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

Fig. 1 is a schematic structural view of the indwelling transfusion device of the present invention.

Fig. 2 is a schematic cross-sectional structural view of the adapter of the present invention.

Fig. 3 is a schematic cross-sectional structure diagram of another direction of the adapter of the present invention.

Fig. 4 is a schematic diagram of the structure of the needleless connector before use.

Fig. 5 is a schematic diagram of the structure of the needleless connector in use.

Fig. 6 is a schematic diagram of the structure of the needleless connector after use.

Detailed ways

Example 1

Please refer to Fig. 1, the indwelling infusion device of the present invention is used in the infusion occasion of one puncture and multiple injections, the indwelling infusion device includes a first dredging tube 10, an adapter 30, a needleless joint 50, and A second dredging pipe 70 .

The first dredging pipe 10 is a section of pipe between the liquid medicine container and the needle-free connector 50 , including some standard infusion set components, such as a dropper, a medicine filter 12 , a hard injection catheter 14 and the like.

The second drainage tube 70 includes a section of catheter from the needleless connector 50 to the blood vessel of the patient, including some standard infusion set components, such as an indwelling catheter 72, a scalp needle 74, and the like.

4 to 6, the needleless joint 50 includes an inflow end 52, an outflow end 54, and a valve core 56 disposed therein, wherein the outer peripheral surface of the inflow end 52 is provided with an external thread 522, and the outflow end 54 is connected to the second dredging tube. The front end of the indwelling catheter 72 of 70 is detachably fixedly connected.

The working principle of the needleless connector 50 is: in the original state (as shown in Figure 4), the infusion channel between the inflow end 52 and the outflow end 54 is closed by the valve core 56; during infusion, the injection catheter 14 is inserted into the inflow end 52, Press the spool 56 to move down to let out the infusion channel, so that the internal liquid of the injection catheter 14, the inflow end 52 and the outflow end 54 are connected (as shown in Figure 5); The action of 58 moves up and down, and when moving up, spool 56 first seals the passage, and along with spool 56 continues to move up, unnecessary liquid medicine in the needleless connector 50 is continued to be pressed toward outflow end 54 (shown in Figure 6).

Please refer to FIG. 2 , the adapter 30 is a stepped cylindrical hollow shell with a large top and a small bottom, including an upper half 32 , a lower half 34 and a partition that opens a through hole 36 for the injection catheter 14 to pass through. , wherein the inner diameter of the upper part 32 is slightly equal to the outer diameter of the medicine filter 12, the inner diameter of the lower part 34 is slightly equal to the outer diameter of the inflow end 52, wherein the inner wall of the upper part 32 is protruded with a stop rib 322, the lower The inner wall of the half part 34 is provided with an internal thread 344 . Wherein, after the medicine filter 12 of the first dredging pipe 10 is inserted into the inner cavity of the upper part 32, the upper end surface of the medicine filter 12 can be stopped by the lower end surface of the stop rib 322; the inflow end 52 of the needleless connector 50 The external thread 522 of the adapter 30 can be screwed with the internal thread 344 of the lower half 34 of the adapter 30 . Moreover, when the external thread 522 and the internal thread 344 are completely screwed together, the vertical distance from the lower end surface of the stop rib 322 to the critical opening position plane of the valve core 56 (at which the inflow end 52 and the outflow end 54 begin to communicate) is less than or equal to The distance from the upper end surface of the drug filter 12 to the end of the injection catheter 14 .

In order to facilitate disinfection and insertion, the upper half 32 of the adapter 30 is provided with at least one notch, and the preferred method is to symmetrically cut a part longitudinally on both sides of the upper half 32 .

When the injection is started, the external thread 522 is fully screwed with the internal thread 344, so that the adapter 30 and the needleless connector 50 are stably connected and fixed together. When the injection catheter 14 is pressed by an external force, the valve core 56 is inserted into When it flows into the end 52, the medicine filter 12 gradually elastically deforms with the stop rib 322 on the inner wall of the upper half 32 of the adapter 30, and the upper half 32 expands outward until the upper half of the medicine filter 12 The end surface moves to the bottom of the stop rib 322, and at this time the upper part 32 elastically returns to the center, so that the upper end surface of the medicine filter 12 is stopped by the lower end surface of the stop rib 322, and after the external force is stopped, the movement of the valve core 56 The elastic restoring force cannot overcome the resistance of the blocking rib 322 to make the drug filter 12 pass over the blocking rib 322 . And because after the external thread 522 and the internal thread 344 are completely screwed together, the vertical distance from the lower end surface of the stop rib 322 to the critical opening position plane of the valve core 56 is less than or equal to the distance from the upper end surface of the drug filter 12 to the end of the injection catheter 14, Therefore, at this time, the valve core 56 will be pushed down to the open position by the injection catheter 14, so that the injection catheter 14 remains in a state of fluid communication with the inflow end 52 and the outflow end 54 of the needleless connector.

After the injection is finished, apply an external force to pull out the drug filter 12 from the inner cavity of the upper part 32 of the adapter 30. The external force can overcome the resistance of the stop rib 322 and expand the upper part 32 outward, so that the drug filter 12 Going over the stop rib 322, the injection catheter 14 gradually withdraws from the inflow end 52 of the needleless connector 50, and correspondingly, the valve core 56 gradually moves the distance between the inflow end and the outflow end under the action of the elastic restoring force of the elastic element 58. The channel between them is blocked, and finally the needleless joint 50 is closed from the outside world.

Example 2

As yet another embodiment of the present invention, the first drainage tube 10 includes a first positioning portion, the needleless connector 50 includes a second positioning portion, and the adapter 30 includes a first positioning portion and a second positioning portion respectively. The portion corresponds to a first holding portion and a second holding portion that are fixedly connected.

Wherein, the first positioning part may be other special structures other than the medicine filter 12 . Such as a positioning block arranged on the first dredging pipe 10, and the positioning block can be circular, polygonal, wedge-shaped, spherical, and other irregular shapes, thereby, the inner cavity of the upper half 32 of the adapter 30 also corresponds to Set to the corresponding shape. Moreover, the upper half 32 of the adapter 30 may not have a gap.

Wherein, the connection between the first dredging tube 10 and the inflow end 52 of the needle-free connector 50 , and the connection between the second dredging tube 70 and the outflow end 54 of the needle-free connector 50 are all sealed connections.

Example 3

As yet another embodiment of the present invention, the first drainage tube 10 includes a first positioning portion, the needle-free connector 50 includes a second positioning portion, and the adapter 30 includes a first positioning portion and a second positioning portion respectively. The portion corresponds to a first holding portion and a second holding portion that are fixedly connected.

Wherein, the connection between the first positioning part and the first holding part adopts stop fit, snap fit, screw fit or interference fit, and the connection between the second positioning part and the second holding part adopts stop fit. fit, snap fit, screw fit or interference fit. The first positioning part and the first holding part, and the second positioning part and the second holding part may adopt the same matching method or different matching methods.

For example, the adapter 30 and the first dredging tube 10 adopt thread fit, and the adapter 30 and the needleless joint 50 adopt stop fit or snap fit; or the adapter 30 and the first dredging tube 10 and the needleless All joints 50 are threaded.

Wherein, the stop fit includes not only the stop between the convex rib and the end face, but also the stop between the step and the end face, the stop between the convex point and the end face, and so on.

Wherein, the buckle fit may include the fit between the protrusion and the groove, the fit between the hook and the hole, the fit between the buckle hoop and the positioning surface, and the like.

Wherein, the interference fit may include an interference fit between the optical axis and the optical hole, an interference fit with a friction-enhancing structure, and the like.

Claims (6)

1, a kind of adaptor that is used for remain-type infusion device, removably connect and make the first outflow end internal communication of dredging the Guan Yuwu needle adapter in order to first of infusion set is dredged the Guan Yuwu needle adapter, described first dredges pipe comprises one first location division, described no needle adapter comprises one second location division, and described adaptor is provided with corresponding with first location division and second location division respectively one first fixedly connected holding parts and one second holding parts; It is characterized in that, described adaptor is a hollow housing, comprise two parts up and down, the interior diameter of the first half slightly equals the overall diameter of first location division, the interior diameter of the latter half slightly equals not have the overall diameter of the inflow end of needle adapter, described first holding parts is the block fin that is provided with on the first half inner walls, second holding parts is the female thread that is provided with on the latter half inner walls, described first upper surface of dredging first location division of pipe can be by the lower surface block of described block fin, and second location division of described no needle adapter is to be arranged on no needle adapter to flow into the external screw thread that can cooperatively interact and be connected with described female thread on the end periphery.

2, adaptor as claimed in claim 1, it is characterized in that, described second location division is with after second holding parts is fixedlyed connected, and described first holding parts is dredged pipe terminal distance smaller or equal to described first location division to described first to the planar vertical dimension in critical enable possition of the spool of described no needle adapter.

3, adaptor as claimed in claim 1, it is characterized in that, after the elastic force that described first end of dredging pipe overcomes the spool of described no needle adapter is inserted the inflow end of described no needle adapter and is arrived the critical enable possition of spool, described first location division moves to the first holding parts lower end, and described first holding parts resistance that first location division is applied is greater than the elastic restoring force of described spool.

4, a kind of remain-type infusion device, comprise that one first dredges pipe, and is provided with and flows into end and dredge pipe with the no needle adapter, one second of outflow end, described second dredges pipe removably is incorporated into the outflow end of no needle adapter and makes the second outflow end internal communication of dredging the Guan Yuwu needle adapter, it is characterized in that described remain-type infusion device comprises that further one removably connects described first and dredges the inflow end of Guan Yuwu needle adapter and make first to dredge the inflow end of Guan Yuwu needle adapter and the adaptor of outflow end internal communication; Described first dredges pipe comprises one first location division, and described no needle adapter comprises one second location division, and described adaptor comprises corresponding with first location division and second location division respectively one first fixedly connected holding parts and one second holding parts; Described adaptor is a hollow housing, comprises up and down two parts, and the interior diameter of the first half slightly equals the overall diameter of first location division, and the interior diameter of the latter half slightly equals not have the overall diameter of the inflow end of needle adapter; Supravasal medicine filter is dredged for being arranged on first in described first location division, described second location division is to be arranged on the external screw thread that described no needle adapter flows into the end periphery, described first holding parts is the block fin that is provided with on the adaptor inner walls, second holding parts is the female thread that is provided with on the adaptor inner walls, described first upper surface of dredging the medicine filter of pipe can be by the lower surface block of described block fin, and the external screw thread of described no needle adapter can interconnect with the female thread of described adaptor.

5, remain-type infusion device as claimed in claim 4 is characterized in that, the first half of described adaptor is offered at least one breach; Described second location division is with after second holding parts is fixedlyed connected, and described first holding parts is dredged pipe terminal distance smaller or equal to described first location division to described first to the planar vertical dimension in critical enable possition of the spool of described no needle adapter.

6, remain-type infusion device as claimed in claim 4, it is characterized in that, described first dredges the pipe end is provided with an injection catheter, described no needle adapter also comprises a sealing, and it flows into the spool of end and outflow end, to oppress described spool after elastic force that described injection catheter overcomes spool under external force inserts described inflow end produces displacement and makes described inflow end and outflow end conducting, when removing external force, the upper surface of described medicine filter is by the lower surface block of described block fin, the elastic restoring force of described spool can not overcome this block power, thereby the inflow end and the outflow end of described first injection catheter of dredging pipe and no needle adapter remain on the state that is interconnected.

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