Precise flow adjusting device for infusion apparatus

Abstract

The precise flow adjusting device comprises a shell (1) and a screw rod (4), an infusion tube (6) penetrates through the shell (1), an elastic piece (8) is arranged at the end, located in the shell (1), of the screw rod (4), the infusion tube (6) is clamped between the elastic piece (8) and the bottom face (2) of the shell (1), and the length of the portion, making contact with the infusion tube (6), of the elastic piece (8) is larger than the diameter of the screw rod (4). Pressure of the screw (4) is applied to the infusion tube (6) through the elastic piece (8), and compared with the mode that the pressure of the screw (4) is directly applied to the infusion tube (6) through the end of the screw (4), the length of the deformation part of the infusion tube (6) is greatly increased, the violent change of the cross section area of the stressed part of the infusion tube (6) is reduced, the change is smoother, and the infusion tube (6) is more stable. Therefore, adaptability to viscous liquid, environment temperature and vibration is improved, uncontrolled changes of liquid flow in the infusion tube (6) are reduced, and the purpose of precise flow adjustment is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a precision flow regulating device. Background Art

[0002] An infusion set is a medical device used for infusion. It delivers liquid from a bottle or plastic bag hung at a high place into a living body through an infusion tube. The flow rate is manually adjusted by a flow regulator installed on the infusion tube. The speed of infusion is determined by observing the dripping speed of the droplets on the infusion tube. Chinese patent application No. 201320485332.4 "An infusion set flow regulating device" cooperates with the screw and the thread. When the screw rotates, the existence of the thread allows the end of the screw to move precisely. A control clamp is installed at the end of the screw to deform the infusion tube. It can be seen that although this solution can deform the infusion tube in a fine manner, it can achieve better flow regulation control for liquids with good fluidity, such as physiological saline. Liquids such as water, but for liquids with a certain viscosity or high viscosity, it is difficult for the device to adjust the appropriate flow rate. With the development of society and the advancement of medical technology, a variety of liquids need to be input into organisms, including the human body, through the infusion device; due to the different types of liquids, their viscosity and other characteristics are also different. For example, when inputting liquids such as blood and nutrient solution, there are generally certain requirements for the flow rate, which cannot be too fast or too slow. Because the length of the control clamp acting on the infusion tube is short, the cross-section that allows the liquid to flow through will be relatively small, which can easily cause the viscous liquid to not flow through the part of the infusion tube where the control clamp acts, causing the infusion to stop; when the control clamp is released, it is easy to cause the liquid to flow too fast, which is not conducive to the health of the patient. In actual environments, due to factors such as vibration, temperature changes, and creeping deformation of materials, the parameters of the regulator change, resulting in a large change in the infusion speed. In some cases, because the flow rate is too fast and is not discovered and corrected in time, it may even lead to serious accidents. Although there are instruments and equipment such as peristaltic pumps and electronic sensor monitoring for infusion, their cost is high and the maintenance cost is high. Summary of the invention

[0003] In view of the shortcomings of existing regulators, the present invention discloses a structure for increasing the length of a pressurized infusion tube, thereby greatly improving the ability of the regulator to adapt to changes in the environment, etc., reducing fluctuations in the infusion flow rate, and being able to precisely control the infusion flow rate to ensure that the flow rate requirements are met.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: A precision flow regulating device for an infusion device, comprising a housing provided with a threaded hole, and a screw threadedly matched with the threaded hole, an adjusting wheel being provided at the end of the screw located outside the housing, and an infusion tube passing through the housing, characterized in that the other end of the screw is located inside the housing, and a spring is provided at the end thereof, the infusion tube is clamped between the spring and the bottom surface of the housing, and the length of the portion of the spring in contact with the infusion tube is greater than the diameter of the screw. The pressure applied by the screw to the upper surface of the spring is dispersed by the spring in the length direction along the axial direction of the infusion tube, and the length of the action is the length of the spring in contact with the infusion tube.

[0005] Preferably, the spring sheet is elastic.

[0006] Preferably, the spring sheet is one of a metal sheet and a non-metal sheet. Further, the metal sheet is one of a bimetal sheet, a memory alloy sheet, a stainless steel sheet, and a copper alloy sheet.

[0007] Preferably, the surface of the shrapnel has an anti-slip pattern.

[0008] Preferably, the thickness of the spring sheet is thick in the middle and thin at both ends, and the thickness has a smooth transition.

[0009] Preferably, both ends of the spring are raised.

[0010] A layer of elastic material is provided on the inner bottom surface of the shell, and the spring sheet contacts the infusion tube and deforms the infusion tube, and at the same time, the elastic material under the deformed infusion tube is also deformed. Preferably, the elastic material is made of polyurethane, silicone rubber, foam sponge and the like. Preferably, the elastic material is made of high resilience material. Compared with the prior art, the present invention has the following advantages: 1. The spring sheet of the present invention increases the length of the screw acting on the infusion tube. The infusion tube at this length is deformed, that is, it affects the liquid flow rate. This can eliminate or reduce the influence of external factors on the regulating device, ensuring the stability of the flow in the infusion tube.

[0011] 2. Due to the presence of the spring sheet, the present invention disperses the pressure acting on the infusion tube and reduces the deformation of the cross section of the infusion tube at the stressed part, which is beneficial to the flow of viscous liquid and the flow control of viscous liquid.

[0012] In summary, the precision flow regulating device for an infusion set of the present invention has low cost, good effect, stable infusion flow, and good application prospects.

[0013] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0015] Figure 2 A schematic structural diagram of an embodiment of adding an elastic material layer. Description of reference numerals: 1—housing; 2—bottom surface; 3—adjusting wheel; 4—screw; 5—threaded hole; 6—infusion tube; 8—shrapnel; 9—elastic material layer. Implementation

[0016] Example: Figure 1 The precise flow rate regulating device for an infusion device shown in the figure comprises a housing 1 provided with a threaded hole 5, and a screw 4 threadably matched with the threaded hole 5, an adjusting wheel 3 is provided at the end of the screw 4 located outside the housing 1, and an infusion tube 6 passes through the housing 1. In particular, the other end of the screw 4 is located inside the housing 1, and a spring 8 is provided at the end thereof, and the infusion tube 6 is clamped between the spring 8 and the bottom surface 2 of the housing 1, and the length of the portion of the spring 8 in contact with the infusion tube 6 is greater than the diameter of the screw 4. The pressure applied by the screw 4 to the upper surface of the spring 8 is dispersedly applied by the spring 8 in the length direction along the axial direction of the infusion tube 6, and the length of the action is the length of the spring 8 in contact with the infusion tube 6. Rotate the adjusting wheel 3 to rotate the screw 4, and under the action of the threaded hole 5, the screw 4 moves up and down. The end of the screw 4 located inside the shell 1 is provided with a spring sheet 8. The spring sheet 8 moves up and down as the screw 4 moves up and down. At the same time, the deformation size of the infusion tube 6 clamped between the spring sheet 8 and the bottom surface 2 of the shell 1 also changes accordingly. The deformation of the infusion tube 6 causes the cross-sectional area provided for the liquid to flow to change, so that the flow rate and flow velocity of the liquid change, thereby achieving the purpose of adjusting the flow rate of the infusion device.

[0017] Preferably, the spring sheet 8 is elastic.

[0018] Preferably, the spring sheet 8 is a metal sheet or a non-metal sheet. Further, the metal sheet is a bimetal sheet, a memory alloy sheet, a stainless steel sheet, or a copper alloy sheet.

[0019] Preferably, the surface of the spring piece 8 has an anti-slip pattern.

[0020] Preferably, the thickness of the spring piece 8 is thick in the middle and thin at both ends, and the thickness has a smooth transition.

[0021] Preferably, both ends of the spring are raised.

[0022] Preferably, Figure 2An elastic material layer 9 is provided on the inner bottom surface 2 of the housing 1. The spring sheet 8 contacts the infusion tube 6 and deforms the infusion tube 6. At the same time, the elastic material layer 9 below the deformed infusion tube 6 is also deformed. Preferably, the elastic material layer 9 is made of polyurethane, silicone rubber, foam sponge, etc. Preferably, the elastic material layer 9 is made of a high-rebound material. The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A precision flow rate regulating device for an infusion set, comprising a housing (1) provided with a threaded hole (5), and a screw (4) threadably matched with the threaded hole (5), an adjusting wheel (3) being provided at the end of the screw (4) located outside the housing (1), an infusion tube (6) passing through the housing (1), characterized in that: The other end of the screw (4) is located in the housing (1), and a spring sheet (8) is provided at the end thereof. The infusion tube (6) is clamped between the spring sheet (8) and the bottom surface (2) of the housing (1), and the length of the portion of the spring sheet (8) in contact with the infusion tube (6) is greater than the diameter of the screw (4).

2. The precise flow rate regulating device for an infusion set according to claim 1, characterized in that: The spring sheet (8) is elastic.

3. The precise flow rate regulating device for an infusion set according to claim 1, characterized in that: The spring sheet (8) is one of a metal sheet and a non-metal sheet.

4. The precise flow rate regulating device for an infusion set according to claim 1, characterized in that: The surface of the spring piece (8) has an anti-slip pattern.

5. The precise flow rate regulating device for an infusion set according to claim 1, characterized in that: The spring sheet (8) is thick in the middle and thin at both ends, and its thickness has a smooth transition.

6. The precise flow rate regulating device for an infusion set according to claim 1, characterized in that: The two ends of the spring sheet (8) are raised.

7. The precise flow rate regulating device for an infusion set according to claim 1, characterized in that: An elastic material layer (9) is provided on the inner bottom surface (2) of the shell (1), and the spring sheet (8) contacts the infusion tube (6) and deforms the infusion tube (6). At the same time, the elastic material layer (9) below the deformed infusion tube (6) also deforms.

8. The precise flow rate regulating device for an infusion set according to claim 7, characterized in that: The elastic material layer (9) is made of one of polyurethane, silicone rubber, and foam sponge materials.

9. The precise flow rate regulating device for an infusion set according to claim 7, characterized in that: The elastic material layer (9) is made of a high resilience material.

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