CN103800962A - Improved disposable safety infusion set - Google Patents

Abstract

The invention relates to an improved disposable safety infusion set, which comprises a bottle inserting needle, a drip funnel, a hose, a liquid medicine filter and an intravenous infusion needle which are sequentially arranged through, wherein a device for controlling the flow rate is placed outside the hose The flow regulator, which also includes a relief valve mechanism. The safety valve mechanism includes a housing, a main part of the floating body arranged in the housing, a sealing part is connected to the lower end surface of the main part of the floating body, an infusion channel opening is located at the lower end of the housing, and the infusion channel opening is located below the sealing part. It includes a joint part, there is a gap between the joint part and the main part of the floating body, and there is a hole at the joint between the lower edge of the main part of the floating body and the sealing part, the above-mentioned gap communicates with the hole, and realizes the communication between the inner cavity of the floating body and the inner cavity of the shell, The size of the above-mentioned gaps and pores ensures that the liquid medicine cannot enter the inner cavity of the floating body due to surface tension under normal infusion conditions. The sealing part of the invention does not deform and fall off, has good sealing performance, and is convenient for mechanized assembly of the main part of the floating body and the sealing part.

Description

Improved disposable safety infusion set

technical field

The present invention relates to an improved disposable safety transfusion device, more specifically, relates to an improved disposable safe transfusion device which can automatically seal the infusion line during intravenous infusion to prevent air from entering the patient's body. It belongs to the field of medical and health technology. the

Background technique

When carrying out intravenous infusion to patient at present, widely use disposable infusion set, have played positive effect to preventing cross-infection between patients like this. However, because it does not have an automatic sealing function when the liquid medicine is infused, there is a possibility that air may enter the patient's veins and return blood, which brings extremely unsafe hidden dangers to the patient, and also increases the working pressure of the medical staff. the

For this reason, a lot of disposable safety infusion devices that can automatically seal the pipeline function when the liquid medicine is transfused are invented. A safety valve mechanism with mechanical flow control function is arranged between the pipes. The safety valve mechanism includes a housing (drip funnel body) and a floating body arranged in the housing (drip funnel). A concave part is arranged under the floating body. (space), there is a seal connected to the bottom of the floating body, the seal is a dense elastic part, and the common one is a circular cylindrical liner around it, and a diaphragm in the middle of the top. Therefore, behind the diaphragm, the concave portion (space) in the floating body is a closed space isolated from the outside. The lower end of the housing (drip funnel body) has an infusion channel opening, and the infusion channel opening is located below the sealing member. During use, with the help of the comprehensive mechanics principle of gravity and buoyancy, the automatic opening and closing of the infusion channel is realized by blocking or leaving the opening of the infusion channel by the seal. When the liquid medicine is about to be infused, the floating body descends with the level of the liquid medicine until the infusion line is closed, thereby preventing the possibility of air entering the patient's veins and returning blood. the

The deficiencies of existing technology are:

1. Poor sealing performance. Some similar technologies use conical or curved surface sealing, but the sealing performance is not good because it is necessary to ensure that all parts of the conical or curved surface are in good contact with the base at the same time. the

2. The connection is not strong enough. Disposable safety infusion sets are sterile medical devices and need to go through a strict sterilization process. The sterilization method generally adopts ethylene oxide sterilization. When sterilizing, the infusion set placed in the sterilizing cabinet needs to be vacuum-treated first. In the process of forming a vacuum, the air in the inner space (concave part) of the floating body expands, and the seal, especially the diaphragm part, deforms first, and the amount of deformation increases with the volume of the space (concave part). It is very easy to disengage or even fall off from the main part of the floating body due to deformation and tearing. When the vacuum treatment ends and returns to the normal pressure state, the seal will recover due to the change of internal and external air pressure, but whether it can be well restored to its original shape at this time depends on the stress state brought by the hardness and structural form of the seal. In addition, according to clinical needs, the product should be able to meet the requirements of multi-dose bottle change. When the floating body is separated from the channel opening, it must overcome the negative pressure suction under the seal to float again. This process has a great impact on the connection firmness of the main part of the floating body and the seal Another test. Without a reliable connection method, the seal is easy to disengage or even fall off from the main part of the floating body. the

3. The disposable safety infusion set is a drug delivery device for the human blood system. It has high requirements on the biological properties of the material, drug compatibility and foreign body shedding prevention. The main floating body and seals inside the device directly contact the drug solution. , if glue is used for bonding to ensure or strengthen the firmness of the connection, the above requirements cannot be met. The possibility that Chinese patent CN201564867U discloses that the floating body main part and the sealing part of the infusion set are bonded with glue is ruled out in practice. the

4. Inconvenient processing. The infusion sets disclosed in Chinese patents CN101022845 and CN201668789U adopt the "inverted horn" type connection structure to deal with the problem of anti-falling off, which is relatively good, but the main part of the floating body has a large inner cavity with a small opening, and it must be rigidly demoulded during injection molding, which is difficult , the yield rate is not high. At the same time, during the assembly process of the above-mentioned seal and the main part of the floating body, the lining body of the soft sealing part needs to be radially squeezed before it can be loaded into the main part of the floating body. Due to the increase in the air pressure in the cavity, it is difficult to squeeze in place and easy to fall off. It is very difficult to realize mechanized assembly. There are more or less defects in the technical aspects of these infusion sets mentioned above, and need to be improved. the

Contents of the invention

The present invention aims to provide an improved disposable safety infusion set with no deformation and falling off of the sealing part, good sealing performance, and convenient mechanized assembly of the main part of the floating body and the sealing part. the

Technical scheme of the present invention is as follows:

An improved disposable safety infusion set, including bottle insertion needles, drip funnels, hoses, liquid medicine filters and intravenous infusion needles set through sequentially, wherein a flow regulator for controlling flow is arranged outside the hose, which It also includes a safety valve mechanism with a mechanical flow control effect arranged in the dripping funnel or between the hose and the hose. The safety valve mechanism includes a casing and a floating body with a cavity inside the casing. The main part, the lower end surface of the main part of the floating body is connected with a sealing part, and the lower end of the shell has an infusion channel opening, and the infusion channel opening is located below the sealing part, and it is characterized in that it also includes a There is a gap between the joint part and the main part of the floating body, and there is a hole at the joint between the lower edge of the main part of the floating body and the sealing part. The gap communicates with the hole and realizes the communication between the inner cavity of the floating body and the inner cavity of the shell Even, the size of the above-mentioned gaps and pores ensures that the medicinal solution cannot enter the inner cavity of the floating body under normal infusion conditions. the

The above-mentioned safety valve mechanism with mechanical flow control meets the following conditions: during the infusion process, when the liquid level of the medicinal liquid in the shell is at a normal height, the floating body is in a suspended state, and the medicinal liquid cannot enter the inner cavity of the floating body due to the effect of surface tension. the

The advantages of the above-mentioned technical solution are: 1. Due to the existence of the above-mentioned gaps and pores, the inner cavity of the floating body is connected with the inner cavity of the shell. The seal will not be deformed, and will not dislodge or even fall off from the main part of the floating body; 2. It is not necessary to use a connection structure between the main part of the floating body and the sealing part that is not easy to process in order to solve the problem of preventing dislocation and falling off. The product is easy to process and the yield rate is high. 3. The seal does not have the aforementioned problem of bad recovery, which ensures the sealing performance; 4. The joint form of the seal and the main part of the floating body can meet the requirements of connection firmness and mechanized assembly; 5. Compared with the main part of the floating body Holes are directly opened on the top to realize the communication between the cavity of the floating body and the outside. The advantage is that it is easy to process and does not need to be reprocessed on the main part of the floating body. the

A further technical solution is that the working surface of the sealing member is a plane. This avoids the disadvantages of poor sealing performance when using a conical surface seal or a curved surface seal, and that the floating body is not easy to float again when multiple doses are changed. the

A further technical solution is that the engaging part is a clasp, and the clasp is an integral part composed of a barrel-shaped side wall and a circular ring connected to the bottom of the side wall, and the diameter of the inner circle of the bottom is larger than the outer circle of the infusion channel opening diameter, which is smaller than the outer diameter of the seal. the

A further technical proposal is that there are small axial grooves on the outer wall of the lower part of the main part of the floating body, and communicate with the holes along the lower edge of the main part of the floating body. the

A further preferred technical solution is that the sealing member is a disc-shaped diaphragm made of elastic material whose outer diameter is slightly smaller than the inner diameter of the side wall of the snap ring. the

The clasp and diaphragm of the above structure are used to facilitate the mechanized press-fit assembly of the floating body. the

In order to facilitate mechanized press-fit assembly, the thickness of the periphery of the above-mentioned sealing member may be slightly greater than the thickness of the middle part. the

Another preferred technical solution is that it also includes a guiding device, the main part of the floating body and the casing are movably connected through the guiding device, and the guiding device ensures that the floating body can only move freely in the axial direction of the casing. the

The above-mentioned guide device can adopt the following technical scheme: the main part of the floating body is connected with a guide rod, and there is a guide member connected with it in the housing, and the above-mentioned guide rod cooperates with the guide member and can move freely along the guide member in the direction of the central axis of the housing . the

The above-mentioned guiding device can also adopt the following technical solution: through the clearance fit between the outer wall of the main part of the floating body and the inner wall of the shell, the movement guidance of the floating body can be realized, so as to ensure that the floating body will not deviate from the central axis of the shell. the

The above-mentioned guiding device can also adopt the following technical solution: the outer wall of the main part of the floating body cooperates with the guiding piece connected to the shell to ensure the movement of the floating body along the central axis of the shell. the

A more preferred technical solution is that the safety valve mechanism is arranged in the dripping funnel, and the housing is the dripping funnel body. the

The present invention conveniently realizes the object of the invention due to the adoption of the above-mentioned technical scheme. the

Description of drawings

The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. the

Fig. 1 is a structural schematic diagram of the first embodiment of the present invention. the

Fig. 2 is a partially enlarged view of the first embodiment of the present invention. the

Fig. 3 is a schematic structural diagram of a second embodiment of the present invention. the

Fig. 4 is a partially enlarged view of the second embodiment of the present invention. the

Fig. 5 is a schematic structural diagram of a third embodiment of the present invention. the

Fig. 6 is a partially enlarged view of the third embodiment of the present invention. the

Fig. 7 is a schematic structural diagram of a fourth embodiment of the present invention. the

Fig. 8 is a partially enlarged view of the fourth embodiment of the present invention. the

Fig. 9 is an axonometric view of the composition of the floating body in the second and fourth embodiments of the present invention. the

The serial numbers in the figure are: 1, bottle insertion needle; 2, air filter; 3A, exhaust valve; 3B, liquid medicine tee; 4A, hard shell; 4B, upper soft shell; 5A, hard shell Bottom cover; 5B, the lower hard shell; 6, the middle channel of the liquid medicine; 7A, the limit piece; 7B, the guide piece; 8, the main part of the floating body; Infusion channel opening; 13, hose; 14, flow regulator; 15, liquid medicine filter; 16, intravenous infusion needle; 17, guide rod; 18, hard shell upper cover; 19, small groove. the

Detailed ways

Referring to accompanying drawings 1 and 2, the improved disposable safety infusion set shown in the first embodiment of the present invention is an improved disposable safety infusion set with a safety valve mechanism arranged in the dropping funnel. Its drop funnel body is the housing of the safety valve mechanism. Considering the convenience of manufacture, the drip funnel is made up of a hard shell loam cake 18, a hard shell 4A and a hard shell bottom cover 5A. The housing upper cover 18 is attached with a bottle insertion needle 1, an air filter 2 and an exhaust valve 3A. The limiting member 7A is integrally formed with the hard shell 4A. The middle channel 6 of the liquid medicine is opened on the 7A. The floating body main part 8 is arranged in the hard shell 4A. The infusion channel port 12 is arranged on 5A. The sealing member 10 is made of latex material, is located under the main part of the floating body 8, and is connected with the main part of the floating body 8 by a joint part 11 . The improved disposable safety infusion set includes a bottle insertion needle 1, a dripping funnel (18, 4A and 5A), a flexible tube 13, a liquid medicine filter 15 and an intravenous infusion needle 16 that are arranged sequentially through, wherein the flexible tube The outer casing is provided with a flow regulator 14 for controlling the flow, and it also includes a safety valve mechanism with a mechanical flow control function arranged in the dropping funnel. The safety valve mechanism includes a hard shell 4A, a stopper 7A, a floating body main part 8, a seal 10, a joint part 11, an infusion channel opening 12, and a hard shell bottom cover 5A. The floating body main part 8 can move along the cylindrical inner wall of the lower part of the hard shell 4A, and can only move freely in the direction of the central axis of the hard shell 4A. The above-mentioned hard shell 4A, hard shell bottom cover 5A, stopper 7A, floating body main part 8 and the seal 10 connected thereto, and joint parts 11 are all made of materials that meet the requirements of biological performance and drug compatibility. become. The above-mentioned safety valve mechanism with mechanical flow control effect meets the following conditions: during the infusion process, when the liquid level in the drip funnel is at a normal height, the floating body is in a suspended state, the infusion is carried out normally, and the liquid enters through the infusion channel port 12 below in the pipeline. the

When the infusion is about to be completed, the liquid level of the liquid medicine drops in the drip funnel, and the floating body descends as the liquid level drops until the seal 10 at its lower end closes the infusion channel opening 12, and the liquid medicine in the pipeline below is still in the pipeline. , the cooperation between the outer wall of the floating body main part 8 and the inner wall of the hard shell 4A ensures that the floating body will not deviate from the central axis of the drip funnel, enhances the reliability of the closure, and prevents air from entering the infusion pipeline at the lower end of the channel opening, thereby preventing The air enters the patient's body, and the medicinal solution in the infusion line below prevents the return of blood. the

Referring to accompanying drawings 3 and 4, the improved disposable safety infusion set shown in the second embodiment of the present invention is different from the first embodiment of the present invention in that in the second embodiment of the present invention, the sealing member 10 It is made of silica gel; the movement guide of the floating body in the safety valve mechanism adopts the cooperation of the guide piece 7B and the guide rod 17 . The guide piece 7B is integrally formed with the hard shell 4A, and the middle channel 6 of the liquid medicine is opened on the guide piece 7B. When the infusion is about to be completed, the liquid level of the liquid medicine drops in the drip funnel, and the floating body descends with the drop of the liquid level until the seal 10 at its lower end closes the infusion channel opening 12, and the liquid medicine in the pipeline below is still in the pipeline , the cooperation of the guide piece 7B and the guide rod 17 ensures that the floating body will not deviate from the central axis of the drip funnel, enhances the reliability of the closure, and prevents air from entering the infusion pipeline at the lower end of the channel opening, thereby preventing air from entering the patient. In the body of the patient, the medicinal solution in the infusion line below prevented the return of blood. the

Referring to accompanying drawings 5 and 6, the improved disposable safety infusion set shown in the third embodiment of the present invention differs from the first embodiment of the present invention in that in the third embodiment of the present invention, the dropping funnel It is composed of the upper soft shell 4B and the lower hard shell 5B; the movement guide of the floating body in the safety valve adopts the cooperation of the outer wall of the main part of the floating body 8 and the inner wall of the lower hard shell 5B; the bottle insertion needle 1 and the air filter 2 are formed separately; The liquid medicine tee 3B is provided, and the exhaust valve 3A is not provided; the stopper 7A is formed separately from the upper soft shell 4B and the lower hard shell 5B. the

Referring to accompanying drawings 7 and 8, the improved disposable safety infusion set shown in the fourth embodiment of the present invention differs from the second embodiment of the present invention in that the dropping funnel consists of an upper soft shell 4B and a lower hard shell body 5B; bottle insertion needle 1 and air filter 2 are formed separately; liquid medicine tee 3B is added, and exhaust valve 3A is not provided; guide 7B is formed separately from upper soft shell 4B and lower hard shell 5B. the

In the present invention, the dropping funnel and the safety valve mechanism can also be arranged separately, and the liquid medicine penetration sequence can be adjusted accordingly to form several embodiments, which will not be described here. the

The above drawings and embodiments are only used to illustrate the present invention, and do not constitute any limitation to the protection scope of the present invention. the

Of course, under the inventive concept of the present invention, the present invention has multiple implementation forms and equivalent alternatives, which can be reproduced by those skilled in the art after reading this specification without any creative work, and will not be described in detail here. . Adopting the above-mentioned equivalent alternatives certainly falls within the protection scope of the present invention. the

The present invention constituted by the above-mentioned structure has many advantages for those skilled in the art today, and indeed has technological advancement. the

However, other operative embodiments of the present invention can be modified with basic knowledge within the technical field of the present invention. In the present invention, a patent protection request is made for the substantive technical solution, and its protection scope shall include all variations having the above-mentioned technical characteristics. the

Claims (11)

1. An improved one-time use safety infusion set, including a bottle insertion needle, a drip funnel, a hose, a liquid medicine filter and an intravenous infusion needle set through in sequence, and a flow regulator for controlling the flow is arranged outside the hose , it also includes a mechanical flow control safety valve mechanism arranged in the dripping funnel or between the hose and the hose, the safety valve mechanism includes a housing, and the interior of the housing is a cavity The main part of the floating body, the lower end of the main part of the floating body is connected with a seal, the lower end of the shell has an infusion channel opening, and the infusion channel is located below the seal, and it is characterized in that it also includes a seal for connecting the seal with the The joint part fixedly connected to the main part of the floating body. There is a gap between the joint part and the main part of the floating body. There is a hole at the joint between the lower edge of the main part of the floating body and the sealing part. The cavities are connected, and the size of the above-mentioned gaps and pores ensures that the medicinal solution cannot enter the inner cavity of the floating body under normal infusion conditions. 2. The improved disposable safety infusion set according to claim 1, characterized in that: the engaging part is a clasp, and the clasp is a circular ring formed by a barrel-shaped side wall and connected to the bottom of the side wall The inner circle of the bottom is larger than the outer diameter of the infusion channel opening, but smaller than the outer diameter of the seal. 3. The improved disposable safety infusion set according to claim 2, characterized in that: the inner wall of the snap ring has a small axial groove, and the small axial groove communicates with the hole along the lower edge of the main part of the floating body. 4. The improved disposable safety infusion set according to claim 1, characterized in that: there is an axial small groove on the outer wall of the lower part of the main part of the floating body, and the small axial groove communicates with the hole along the lower edge of the main part of the floating body. 5. The improved disposable safety infusion set according to any one of claims 1-4, characterized in that: the working surface of the sealing member is a plane. 6 . The improved disposable safety infusion set according to claim 5 , wherein the sealing member is a disk-shaped diaphragm made of elastic material whose outer diameter is slightly smaller than the inner diameter of the clasp side wall. 6 . 7. The improved disposable safety infusion set according to claim 6, characterized in that the thickness of the periphery of the sealing member is slightly greater than the thickness of the middle part. 8. The improved disposable safety infusion set according to claim 7, characterized in that it also includes a guiding device, the main part of the floating body and the housing are flexibly connected through the guiding device, and the guiding device ensures that the floating body only Can move freely in the axial direction of the housing. 9 . The improved disposable safety infusion set according to claim 7 , characterized in that: the outer wall of the main part of the floating body and the inner wall of the casing fit in a gap. 10. The improved disposable safety infusion set according to claim 8, characterized in that: the safety valve mechanism is arranged in the dripping funnel, and the housing is a dripping funnel body. 11. The improved disposable safety infusion set according to claim 9, characterized in that: the safety valve mechanism is arranged in the dripping funnel, and the housing is a dripping funnel body.

Images