A central venous pressure measuring device

Abstract

This utility model relates to a central venous pressure measuring device, including a measuring frame with graduation lines. The front side of the measuring frame has an axially extending groove for fixing an infusion tube. The two sides of the groove have outwardly protruding ridges with a height not exceeding 2mm. A vertical groove is provided inside the ridges, and freely rolling ball bearings are installed on both sides of the vertical groove. A slider is mounted on the vertical groove, and an observer is mounted on the outer end of the slider facing the groove. The observer includes a mounting block and a magnifying glass. A light source emitting a beam towards the magnifying glass is connected to the mounting block on the side corresponding to the magnifying glass. A finger ring is provided on the side of the mounting block away from the magnifying glass. This device has a simple overall structure, small size, simple and flexible measurement operation, and high measurement accuracy, making it highly practical.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a central venous pressure measuring device. Background Technology

[0002] Central venous pressure (CVP) refers to the pressure in the right atrium and the thoracic segments of the superior and inferior vena cava. Measuring CVP can be used to assess a patient's overall blood volume, cardiac function, and vascular tone. Currently, disposable infusion sets are used for measuring CVP. According to the CVP measurement procedure, the upper end of the tubing must be open to the atmosphere. This means separating the infusion set's stopper from the infusion bottle, then holding the infusion set in one hand while observing the rate and stopping point of the fluid level in the tubing, and recording the measurement result. If continued infusion is needed after the measurement, the stopper is reinserted into the infusion bottle. This procedure has the following disadvantages: the stopper is exposed to air for a long time, making it prone to contamination; and the measurer's view while holding the infusion set and observing the fluid level in the tubing is inconvenient.

[0003] A patent publication number CN221830577U discloses an infusion set for measuring central venous pressure, comprising, from bottom to top, a scalp vein needle, an adjuster, a Murphy drip tube, a three-way valve, a first venting tube, and a puncture device. The scalp vein needle, adjuster, Murphy drip tube, three-way valve, and puncture device are all connected via an infusion tube. The first venting tube is located on the infusion tube below the puncture device. The set also includes a measuring frame, which is a rigid, elongated support with graduations. The measuring frame is detachably fitted onto the adjuster. The infusion tube below is connected to the atmosphere via a three-way valve without separating the trocar from the infusion bottle. When central venous pressure needs to be measured, the measuring frame 8 is placed on the infusion tube 7, and the 0 mark on the measuring frame 8 is set as the zero point. The heparin cap 91 at one end of the second ventilation tube 9 is removed. Then, by adjusting the three-way valve 4, the main channel 411 and the output channel 413 are disconnected, and the secondary channel 412 and the output channel 413 are connected, so that the infusion tube 7 is connected to the atmosphere. Then, the rate of decrease of the liquid level and the stopping position are observed and recorded. However, during use, the device is prone to displacement due to its large overall structure. Furthermore, the adjusting rod 86 is designed to be slidably inserted into the adjusting groove 822 and relatively fixed by bolts 861. This requires one hand to hold the measuring frame and the other hand to push the adjusting rod during measurement, which is cumbersome. The adjusting rod is also prone to getting stuck in the adjusting groove, resulting in uneven adjustment. In addition, the rigid sleeve in its structure can easily obstruct the view of the liquid level inside the infusion tube, and the scale line 81 is far from the infusion tube, all of which can easily lead to inaccurate measurements. Utility Model Content

[0004] This invention provides a central venous pressure measuring device that is flexible and convenient to operate and provides accurate measurements.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A central venous pressure measuring device includes a measuring frame constructed of a rigid, elongated support. The measuring frame has graduation lines. A strip-shaped groove for fixing an infusion tube is provided axially along the front side of the measuring frame. The two sides of the strip-shaped groove have outwardly protruding ridges with a height not exceeding 2 mm, and the inner side of the ridges has anti-slip textures. A vertical groove is carved into one side of the front of the measuring frame. Roller balls are installed on both sides of the vertical groove. A slider is mounted on the vertical groove. An observer is mounted on the outer end of the slider facing the strip-shaped groove. The observer includes a mounting block and a magnifying glass fixed to the outside of the mounting block. A light source emitting a beam towards the magnifying glass is connected to the side of the mounting block corresponding to the magnifying glass. The light source is electrically connected to a button battery located on the mounting block. A finger ring is provided on the side of the mounting block away from the magnifying glass. Preferably, a fixing ring is connected to the rear of the measuring frame. The fixing ring has an elliptical ring structure, and the inner side of the fixing ring has 2-3 opposing protruding finger ridges.

[0007] Preferably, the fixing ring is located at the center of the rear of the measuring frame.

[0008] Preferably, the inner side of the ring sleeve is provided with a switch for controlling the button battery.

[0009] Preferably, the two ends of the strip-shaped groove are provided with annular sleeves for connecting the infusion tube, the annular sleeves have openings corresponding to the extension lines of the strip-shaped groove, and the inner side of the annular sleeves is bonded with anti-slip rubber.

[0010] Preferably, the outer side of the mounting block extends outward to the outer side of the measuring frame and bends downward to form a wing, and the wing is provided with a screw hole for locking screws.

[0011] Preferably, the measuring frame is made entirely of plastic.

[0012] The above-mentioned technical solution of this utility model has the following beneficial effects:

[0013] This utility model of a central venous pressure measuring device has two main aspects. First, it uses a light beam as a reference ray to align with the fluid level inside the infusion tube and observes the position of the ray corresponding to the scale line, thus providing an accurate reading. Second, its structure, featuring a front finger ring and a rear fixing ring, allows for one-handed operation by medical staff. The slider moves smoothly along the vertical groove, offering flexible adjustment. The device has a simple overall structure, is compact, and highly practical. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the central venous pressure measuring device of this utility model;

[0015] Figure 2 This is a side sectional view of the central venous pressure measuring device of this utility model;

[0016] Figure 3 This is a schematic diagram of the structure of the observer of this utility model. Detailed Implementation

[0017] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings and examples.

[0018] Please see Figure 1 As shown, this utility model discloses a central venous pressure measuring device, including a measuring frame 1 with a rigid elongated support structure. The measuring frame 1 has graduation lines 2. The front side of the measuring frame 1 has an axially upward-facing strip-shaped groove 3 for fixing an infusion tube. The graduation lines 2 are located on both sides of the strip-shaped groove 3. The edges of the strip-shaped groove 3 have outwardly protruding ridges 4 with a height not exceeding 2mm. The inner side of the ridges 4 has anti-slip textures for firmly clamping the infusion tube. A vertical sliding groove 5 is carved into the front side of the measuring frame 1, specifically outside the graduation lines 2. Free-rolling ball bearings 50 are installed on both sides of the vertical sliding groove 5. Figure 2 The ball bearing strip 50 includes a ball bearing frame 52 with multiple circular holes 51 and balls 53 installed in the circular holes 51. A slider 55 is mounted on the vertical groove 5. An observer 6 is mounted on the side of the slider 55 facing the strip-shaped groove 3. The observer 6 includes a mounting block 60 and a magnifying glass 61 fixed to the outside of the mounting block 60. A light source 62 that emits a beam of light towards the magnifying glass 61 is connected to the side of the mounting block 60 corresponding to the magnifying glass 61. Figure 3 As shown, the light source 62 emits a beam of light, which is precisely positioned on the central axis of the magnifying glass. This beam serves as a reference ray, aligned with the liquid surface within the infusion tube, and its position relative to the graduation line is observed for accurate reading. The light source 62 is electrically connected to a button battery mounted on the mounting block 60, which is housed within the mounting block 60. A finger ring 7 is located on the side of the mounting block 60 offset from the magnifying glass 61. A fixing ring 8 is connected to the rear of the measuring frame 1. The fixing ring 8 has an elliptical ring structure, and its inner side has 2-3 opposing protruding finger ridges, making it easy to hold. In use, four fingers are inserted into the fixing ring, and the thumb is looped onto the finger ring. The thumb pushes the observer up and down, making the overall operation convenient, quick, and accurate.

[0019] The fixing ring 8 is located in the middle of the back of the measuring frame 1, ensuring that the thumb has enough space to move up and down.

[0020] The inner side of the ring sleeve 7 is provided with an on / off switch 70 for controlling the button battery. After adjusting the position, the light source is turned on to align the liquid surface.

[0021] The strip-shaped groove 3 has annular sleeves 9 at both ends for attaching the infusion tube. The annular sleeves 9 have openings corresponding to the extension lines of the strip-shaped groove 3. The annular sleeves 9 are extensions of the two ends of the strip-shaped groove 3. Anti-slip rubber 90 is bonded to the inner side of the annular sleeves 9 to ensure the fixed position of the infusion tube.

[0022] The mounting block 60 extends outward to the outside of the measuring frame 1 and bends downward to form a wing 66. The wing 66 has a screw hole with a locking screw 67. The free end of the wing 66 can also extend to surround the rear edge of the measuring frame. When position fixing is required, simply tightening the locking screw 67 will fix the position of the magnifying glass.

[0023] The measuring frame 1 is made entirely of plastic, as are the mounting block and the magnifying glass.

[0024] Furthermore, it should be noted that the measuring device of this utility model is installed on the infusion set. To facilitate the measurement of central venous pressure, the infusion set can be configured as described in the prior art, including a scalp needle, an adjuster, a Murphy drip tube, a three-way valve, a first venting tube, and a puncture device connected sequentially from bottom to top. The scalp needle, adjuster, Murphy drip tube, three-way valve, and puncture device are all connected through the infusion tube. The first venting tube is located on the infusion tube below the puncture device. Including the aforementioned measuring frame, when the infusion set connects the infusion tube to the atmosphere through the three-way valve, it is not necessary to separate the puncture device from the infusion bottle. When it is necessary to measure central venous pressure, the infusion tube is connected to the atmosphere through the three-way valve, and then the measuring device is used to observe and record the rate of descent of the fluid level and the stopping position.

[0025] The above-described embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made by those skilled in the art to the technical solutions of the present utility model without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A central venous pressure measuring device, comprising a measuring frame with a rigid, elongated support structure, wherein the measuring frame is provided with graduation lines, characterized in that, The front side of the measuring frame has a strip-shaped groove along the axial direction for fixing the infusion tube. The two sides of the strip-shaped groove have outward protrusions with a height not exceeding 2mm, and the inner side of the protrusions has anti-slip texture. A vertical slide groove is carved on one side of the front of the measuring frame. Roller balls that can roll freely are installed on both sides of the vertical slide groove. A slider is installed on the vertical slide groove. An observer is installed on the outer end of the slider facing the strip-shaped groove. The observer includes a mounting block and a magnifying glass fixed to the outside of the mounting block. A light source that emits a beam of light towards the magnifying glass is connected to the side of the mounting block corresponding to the magnifying glass. The light source is electrically connected to a button battery located on the mounting block. A finger ring is provided on the side of the mounting block away from the magnifying glass.

2. The central venous pressure measuring device as described in claim 1, characterized in that, The measuring frame is connected to a fixing ring at the rear. The fixing ring has an elliptical ring structure and has 2-3 opposing protruding finger ridges on the inner side.

3. The central venous pressure measuring device as described in claim 2, characterized in that, The fixing ring is located in the middle of the rear of the measuring frame.

4. The central venous pressure measuring device as described in claim 1, characterized in that, The inner side of the ring sleeve is provided with a switch to control the button battery.

5. The central venous pressure measuring device as described in claim 1, characterized in that, The strip-shaped groove has annular sleeves at both ends for attaching the infusion tube. The annular sleeves have openings corresponding to the extension lines of the strip-shaped groove, and anti-slip rubber is bonded to the inner side of the annular sleeves.

6. The central venous pressure measuring device as described in claim 1, characterized in that, The outer side of the mounting block extends outward to the outer side of the measuring frame and bends downward to form a wing. The wing has a screw hole with a locking screw.

7. The central venous pressure measuring device as described in claim 1, characterized in that, The measuring frame is made entirely of plastic.

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