A connector with adjustable opening pressure in the forward direction and anti-backflow in the reverse direction.

Abstract

This utility model discloses a connector with adjustable opening pressure in the forward direction and anti-backflow in the reverse direction, comprising: an upper shell of the connector with an upper channel, the upper end of which is used to connect an infusion tube, and the lower end of which is an opening; a lower shell of the connector with an internal cavity and an open upper end, the upper shell of the connector being fixedly installed at the open end; an upwardly extending guide post installed at the bottom of the lower shell of the connector, the guide post having a guide cavity; a connecting channel on the guide post connecting the cavity and the guide cavity; a lower channel at the lower end of the lower shell of the connector, the upper end of which is connected to the guide cavity, and the lower end of which is used to connect an infusion tube; a guide rod including a lower rod body and an upper connector, the rod body being installed in the guide cavity and slidingly engaging with it in the vertical direction; a spring sleeved on the guide post; and a sealing body installed on the connector of the guide rod, the shape of which matches the opening at the lower end of the upper channel to achieve closure or opening. This utility model has a simple structure, is easy to assemble, and has high consistency in opening pressure.

Description

Technical Field

[0001] This utility model relates to an electric infusion pump, specifically to a connector with adjustable opening pressure in the forward direction and anti-backflow in the reverse direction. Background Technology

[0002] Clinical infusion includes various methods, such as traditional gravity infusion and electric infusion pumps.

[0003] An electric infusion pump is a medical device that allows medical personnel to set an appropriate infusion dose based on the patient's actual condition, enabling long-term micro-infusion and reducing or relieving patient pain. The medication is infused using pressure by converting electrical energy into mechanical energy through the electric infusion pump, and the operating speed of the pump controls the infusion rate / flow rate.

[0004] However, improper use of electric infusion pumps in clinical practice can cause medication to flow out due to gravity. For example, in clinical settings, electric infusion pumps may be moved while being held high or hung on an infusion stand. In such cases, when the reservoir and drive unit are detached, and the pump is positioned higher than the patient's infusion position, the medication may flow out due to gravity. When the medication flows out naturally due to gravity, the flow rate is not controlled by the pump head, posing a very high medical safety risk.

[0005] To avoid the aforementioned risks, a connector is needed for electric infusion pumps to prevent medication from flowing out due to gravity. This connector should remain closed when there is a height difference between the storage device and the infusion site. Furthermore, when the electric infusion pump converts electrical energy into mechanical energy for pressurized infusion, the valve should open smoothly under a certain pressure. Simultaneously, backflow should be prevented under a certain pressure.

[0006] This connector is used as an accessory in the infusion pump's delivery process, requiring a certain opening pressure that cannot fluctuate too much. Currently, products on the market, due to various reasons, exhibit large fluctuations in opening pressure, affecting the infusion pump's delivery accuracy.

[0007] Currently, the structure can be implemented in the following ways:

[0008] 1. Using elastomers as the opening valve, such as CN202020935741.X and CN202022898183.7. The compression of the elastomer is difficult to control, and the elastomer requires high hardness and thickness, resulting in highly unstable opening pressure. This cannot meet current usage conditions.

[0009] 2. The spring + steel ball combination has the disadvantage of insufficient sealing, which makes it prone to leakage and cannot meet the current usage conditions.

[0010] 3. A spring + push rod is used, such as CN202222747850.0. Although a sealing ring is designed in conjunction with it, the following problems still exist: the structural design is complex and there are many parts; the structural design has defects, making it difficult to determine the spring force during component assembly and failing to guarantee consistency; the sealing ring and the inlet are in a linear fit, posing a risk of leakage; the flow guide path is not designed reasonably, and the path is relatively tortuous, resulting in poor flow. Utility Model Content

[0011] In order to solve the problems in the prior art, this utility model provides a connector with adjustable opening pressure in the forward direction and anti-backflow in the reverse direction.

[0012] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0013] A connector with adjustable opening pressure in the forward direction and anti-backflow in the reverse direction, comprising:

[0014] The connector has an upper housing with an upper channel. The upper end of the upper channel is used to connect to the infusion tube and serves as the input end when infusion is in progress. The lower end of the upper channel is an opening.

[0015] The connector has a lower shell with an internal cavity and an opening at the top. The upper shell is fixedly installed at the opening. An upward-extending guide post is installed at the bottom of the lower shell, and the guide post has a guide cavity. A connecting channel is provided on the guide post, which connects the cavity and the guide cavity. The lower end of the lower shell has a lower channel, the upper end of which connects to the guide cavity, and the lower end of which is used to connect to the infusion tube, serving as the output end when infusion is in progress.

[0016] The guide rod includes a lower rod body and an upper connector. The rod body is installed in the guide cavity and slides with it in the vertical direction.

[0017] The elastic element is installed between the guide rod and the guide post to provide resistance for the guide post to move downward and to provide a restoring force for the guide post to move upward.

[0018] The sealing body is installed on the connector of the guide rod, and its shape matches the opening at the lower end of the upper channel to achieve closure or opening.

[0019] Furthermore, the opening at the lower end of the upper channel is a flared type, smaller at the top and larger at the bottom, and the shape of the sealing body matches it.

[0020] Furthermore, the opening at the lower end of the upper channel is V-shaped or trumpet-shaped.

[0021] Furthermore, the sidewall of the guide post has one or more slits distributed circumferentially, which serve as connection channels.

[0022] Furthermore, the gap is the same length as the guide post in the vertical direction.

[0023] Furthermore, the connector includes a fixed seat that is fixedly connected to the upper end of the guide rod, and a retaining seat fixed to the upper side of the fixed seat;

[0024] The diameter of the fixed seat is larger than that of the guide rod, and the upper end of the spring contacts and engages with the fixed seat;

[0025] A groove is formed between the card holder and the fixed seat, and the sealing body can be detachably installed on the card holder and limited by the groove.

[0026] Furthermore, the top of the guide post is a plane, and the bottom of the fixing seat is a plane.

[0027] Furthermore, the elastic element is a spring, which is sleeved on the guide post. The upper end of the spring is connected to the connector, and the lower end is connected to the bottom of the lower shell of the connector.

[0028] Furthermore, the upper end of the lower shell of the connector is provided with an annular stepped groove, and the lower end of the upper shell of the connector is fixedly embedded in the stepped groove.

[0029] Furthermore, the guide post, guide cavity, and guide rod are all cylindrical.

[0030] Furthermore, the lower channel is connected to the infusion tubing via a Luer connector.

[0031] Furthermore, the upper channel, guide cavity, and lower channel are coaxially arranged.

[0032] The beneficial effects of this utility model are:

[0033] 1. The connector of this utility model is mainly used in the infusion line of an electric infusion pump, and its position is behind the infusion pump and in front of the patient end. It remains closed when there is a certain height difference (static water pressure) between the reservoir and the infusion site; and when the electric infusion pump converts electrical energy into mechanical energy for pressure infusion, the connector can open smoothly under a certain pressure. Simultaneously, it can prevent backflow under a certain pressure.

[0034] 2. The structure of this utility model is simpler, with a total of five parts, making assembly convenient, cost-effective, and ensuring high consistency in key dimensions.

[0035] 3. The guide post, spring, guide rod and silicone sleeve of this utility model are all concentrated in the lower shell of the connector. This ensures that the key height matching dimensions are all concentrated in the lower shell of the connector. After the adjustment is in place, the upper shell of the connector can be directly installed to complete the debugging and assembly. It is easy to form, measurable, highly consistent and convenient for key control.

[0036] 4. This utility model allows for the replacement of different springs to achieve different opening pressures, making the opening pressure customizable, detectable, and highly consistent.

[0037] Meanwhile, the spring of this invention has a guide during its movement, resulting in good stability. After compression, it has a limit switch to control the stroke and prevents failure.

[0038] 5. This utility model uses a sealing body and guide rod assembly, which is simple and firm to install. The opening at the lower end of the upper channel is V-shaped or trumpet-shaped, and the shape of the sealing body matches it. It has an automatic guiding and correction function, better pressure resistance and fit, less leakage, and good anti-backflow effect.

[0039] Furthermore, the sealing body is molded using a silicone sleeve, which has lower precision and is made of a softer material, while the upper shell of the connector is made of a harder material. The sealing body, combined with a spring, uses a combination of soft and hard materials, allowing for a certain degree of dimensional tolerance, making production easier and resulting in a higher yield.

[0040] 6. The upper channel, guide cavity and lower channel of this utility model are arranged coaxially, so that the internal flow guiding structure is smooth, the liquid can be output quickly and the valve opening pressure is highly consistent. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the overall design of this utility model;

[0042] Figure 2 This is an exploded view of the present invention;

[0043] Figure 3 This is a top view of the lower shell of the connector in this utility model;

[0044] Figure 4 for Figure 3 AA section view in the middle;

[0045] Figure 5 This is a schematic diagram of the present invention in a closed state;

[0046] Figure 6 This is a schematic diagram of the present invention in the open state.

[0047] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. Detailed Implementation

[0048] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0049] like Figures 1 to 6As shown, this embodiment provides a connector with adjustable opening pressure in the forward direction and anti-backflow in the reverse direction, including an upper connector shell 1, a lower connector shell 2, a spring 3, a guide rod 4, and a silicone sleeve 5, a total of five components. The structure is simpler, the assembly is easier, the cost is lower, and the key dimensions are highly consistent.

[0050] The following provides a detailed explanation of the specific structure of each part.

[0051] The upper shell 1 of the connector has an upwardly extending upper channel 11 in the middle. The upper end of the upper channel 11 is used to connect the infusion tube and is the input end when infusion is in progress. The lower end of the upper channel 11 is a V-shaped opening. In the closed state, the silicone sleeve 5 is press-fitted with the V-shaped opening under the action of the spring 3 and the guide rod 4, which plays a sealing role.

[0052] The lower shell 2 of the connector has an internal cavity with an opening at the top. The upper shell 1 of the connector is fixedly installed at the opening. During installation, an annular stepped groove 24 can be provided at the upper end of the lower shell 2 of the connector. The lower end of the upper shell 1 of the connector is fixedly embedded in the stepped groove 24 to achieve circumferential positioning and fixation. In this way, the upper shell 1 and the lower shell 2 of the connector cooperate to form a closed cavity.

[0053] The bottom center of the lower shell 2 of the connector is equipped with an upwardly extending guide post 21, which has a guide cavity inside; the guide post 21 is also provided with a connecting channel 22, which connects the cavity and the guide cavity.

[0054] In this embodiment, the guide post 21 is composed of two semi-cylinders. A gap of the same length as the guide post 21 is formed at the opposite position of the two semi-cylinders. The gap serves as a connecting channel 22 to facilitate the outflow of liquid entering the cavity.

[0055] The lower end of the connector housing 2 has a downwardly extending lower channel 23 at its center. The upper end of the lower channel 23 communicates with the guide cavity, and the lower end of the lower channel 23 is used to connect the infusion tube, serving as the output end during infusion. In this embodiment, the lower channel 23 adopts a Luer connector design.

[0056] To ensure effective flow, the upper channel 11, the guide cavity, and the lower channel 23 are coaxially arranged, resulting in a smooth internal flow path, rapid liquid output, and high consistency in valve opening pressure.

[0057] The guide rod 4 includes a lower rod body and an upper connector. The rod body is cylindrical and is installed in the guide cavity and slides with it in the vertical direction to form a guide.

[0058] In this embodiment, the connector includes a fixed base 41 fixedly connected to the upper end of the guide rod, and a retaining seat 42 fixed on the upper side of the fixed base 41. The diameter of the fixed base 41 is larger than that of the guide rod 4. The diameter of the retaining seat 42 is smaller than that of the fixed base, and a retaining groove is formed between the retaining seat 42 and the fixed base 41. The silicone sleeve 5 is detachably installed on the retaining seat 41 and is limited by the retaining groove.

[0059] Spring 3 is sleeved on guide post 21. The upper end of spring 3 is in contact with fixed seat 41, and the lower end of spring 3 is in contact with the bottom of connector lower shell 2.

[0060] During operation, spring 3 is fitted around the outer circumference of guide post 21, guiding its movement. Guide rod 4 engages with the inner wall of guide post 21, guiding its movement. Simultaneously, the top of guide post 21 and the bottom of fixed base 41 are designed as flat surfaces, providing support and limiting for the compressed spring. This ensures guidance for spring 3 and guide rod 4 during movement, resulting in good stability. The limiting function after compression controls the stroke and prevents failure.

[0061] The silicone sleeve 5 is installed on the connector of the guide rod, and its shape matches the opening at the lower end of the upper channel. Under the movement of the spring 3 and the guide rod 4, it can achieve sealing or opening. Since both the opening at the lower end of the upper channel and the silicone sleeve 5 are V-shaped, they have an automatic guiding and correction function, better pressure resistance and fit, are less prone to leakage, and have a good anti-backflow effect.

[0062] Because the silicone sleeve 5 is made of silicone, it has low precision and is relatively soft, while the connector shell 1 is made of hard material. The silicone sleeve 5, in conjunction with the spring 3, combines soft and hard materials, allowing for a certain degree of dimensional tolerance, making production easier and resulting in a high yield.

[0063] As can be seen from the above structure, the spring 3, guide rod 4, and silicone sleeve 5 of this utility model are all concentrated in the lower shell 2 of the connector. This ensures that the key height matching dimensions are all concentrated in the lower shell of the connector. After adjustment, the upper shell 1 of the connector can be directly installed to complete the debugging and assembly. Its features are: easy to mold, measurable, high consistency, and convenient control of key molding dimensions.

[0064] This invention allows for the replacement of different springs 3 to achieve different opening pressures, making the opening pressure customizable, detectable, and highly consistent.

[0065] The working principle of this utility model is as follows:

[0066] This invention relates to a connector used in the infusion line of an electric infusion pump. The connector is located behind the pump and in front of the patient. It remains closed when there is a certain height difference (static pressure) between the reservoir and the infusion site. When the electric infusion pump converts electrical energy into mechanical energy for pressurized infusion, the connector opens smoothly under a certain pressure. Simultaneously, it prevents backflow under a certain pressure.

[0067] Example 2:

[0068] The difference between this embodiment and embodiment one is that in this embodiment, the lower end of the upper channel 11 is set as a horn-shaped opening, and the shape of the silicone sleeve 5 is also matched accordingly.

[0069] The above embodiments are only used to illustrate and not limit the technical solutions of this utility model. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the utility model without departing from the spirit and scope of the utility model. Any modifications or partial substitutions should be covered within the scope of the claims of this utility model.

[0070] If the terms "first" or "second" are used in this document to define the components, those skilled in the art should know that the use of "first" or "second" is merely for the convenience of describing this utility model and simplifying the description, and unless otherwise stated, the above terms have no special meaning.

[0071] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0072] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A connector with adjustable opening pressure in the forward direction and anti-backflow in the reverse direction, characterized in that, include: The connector has an upper housing with an upper channel. The upper end of the upper channel is used to connect to the infusion tube and serves as the input end when infusion is in progress. The lower end of the upper channel is an opening. The connector has a lower shell with an internal cavity and an opening at the top. The upper shell is fixedly installed at the opening. An upward-extending guide post is installed at the bottom of the lower shell, and the guide post has a guide cavity. A connecting channel is provided on the guide post, which connects the cavity and the guide cavity. The lower end of the lower shell has a lower channel, the upper end of which connects to the guide cavity, and the lower end of which is used to connect to the infusion tube, serving as the output end when infusion is in progress. The guide rod includes a lower rod body and an upper connector. The rod body is installed in the guide cavity and slides with it in the vertical direction. The elastic element is installed between the guide rod and the guide post to provide resistance for the guide post to move downward and to provide a restoring force for the guide post to move upward. The sealing body is installed on the connector of the guide rod, and its shape matches the opening at the lower end of the upper channel to achieve closure or opening.

2. The connector with adjustable opening pressure in the forward direction and anti-backflow in the reverse direction as described in claim 1, characterized in that, The opening at the lower end of the upper channel is a flared type, smaller at the top and larger at the bottom, and the shape of the sealing body matches it.

3. The connector with adjustable opening pressure in the forward direction and anti-backflow in the reverse direction according to claim 2, characterized in that, The opening at the lower end of the upper channel is V-shaped or trumpet-shaped.

4. The connector with adjustable opening pressure in the forward direction and anti-backflow in the reverse direction according to claim 1, characterized in that, The sidewall of the guide post has one or more slits distributed circumferentially, which serve as connection channels.

5. The connector with adjustable opening pressure in the forward direction and anti-backflow in the reverse direction according to claim 4, characterized in that, The gap is the same length as the guide post in the vertical direction.

6. The connector with adjustable opening pressure in the forward direction and anti-backflow in the reverse direction according to claim 1, characterized in that, The connector includes a fixed seat that is fixedly connected to the upper end of the guide rod, and a retainer fixed to the upper side of the fixed seat; The diameter of the fixed seat is larger than that of the guide rod, and the upper end of the spring contacts and engages with the fixed seat; A groove is formed between the card holder and the fixed seat, and the sealing body can be detachably installed on the card holder and limited by the groove.

7. The connector with adjustable opening pressure in the forward direction and anti-backflow in the reverse direction according to claim 6, characterized in that, The top of the guide post is flat, and the bottom of the fixing seat is flat.

8. The connector with adjustable opening pressure in the forward direction and anti-backflow in the reverse direction according to claim 1, characterized in that, The elastic element is a spring, which is sleeved on the guide post. The upper end of the spring is connected to the connector, and the lower end is connected to the bottom of the lower shell of the connector.

9. The connector with adjustable opening pressure in the forward direction and anti-backflow in the reverse direction according to claim 1, characterized in that, The lower end of the connector shell is provided with an annular stepped groove, and the lower end of the upper connector shell is fixedly embedded in the stepped groove.

10. The connector with adjustable opening pressure in the forward direction and anti-backflow in the reverse direction according to claim 1, characterized in that, The guide post, guide cavity, and guide rod are all cylindrical.

11. The connector with adjustable opening pressure in the forward direction and anti-backflow in the reverse direction according to claim 1, characterized in that, The lower channel is connected to the infusion tube via a Luer connector.

12. The connector with adjustable opening pressure in the forward direction and anti-backflow in the reverse direction according to any one of claims 1-11, characterized in that, The upper channel, guide cavity, and lower channel are coaxially arranged.

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