Percolate collecting and sampling device and sampling method

Abstract

The invention provides a percolate collecting device and a sampling method. The percolate collecting device and the sampling method are used for solving the problem that fresh percolate at different time points cannot be collected by an existing collecting device. According to the percolate collecting and sampling device, a main body of the sampling device is a shell with the sealed periphery and the hollow interior, the interior of the shell is divided into a first cavity and a second cavity in a left-right mode through a cavity partition plate, a liquid inlet is formed in the upper surface of the first cavity, and an upper set of baffle and a lower set of baffle are arranged on the inner wall of the first cavity in an inward protruding mode; a floating plate is arranged between the upper group of baffles and the lower group of baffles, concave holes which are the same as the baffles in shape and position and smaller than the baffles in size are formed in the floating plate, the interior of the second cavity is divided into three cavities by an upper partition plate and a lower partition plate, and sampling ports are formed in the lower sides of the upper cavity and the lower cavity respectively. And the first cavity is communicated with the second cavity through a one-way valve.

Description

Technical Field

[0001] The invention relates to the technical field of wound drainage instruments, and in particular to an exudate collection and sampling device and a sampling method. Background Art

[0002] Negative pressure drainage technology can effectively promote the discharge of wound exudates, including blood, tissue fluid, pus, etc. This technology can promptly remove harmful substances in the wound, reduce the risk of infection, and create a relatively clean healing environment for the wound. At the same time, negative pressure drainage can also promote local blood circulation, accelerate tissue repair and regeneration, and help wound healing and tissue function recovery. Clinically, negative pressure drainage technology is widely used in the treatment of various wounds such as trauma, burns, surgical incisions, etc. It is particularly effective in treating complex wounds and chronic wounds, and is one of the indispensable and important technologies in modern wound treatment.

[0003] Patent CN218515957U discloses an improved VSD negative pressure drainage device, which can collect wound exudate while achieving negative pressure drainage. The present invention is an improvement and optimization of the collection and sampling device based on this patent. The reason for the improvement is that the exudate contains a variety of information about the wound condition. By detecting the fresh exudate in a certain period of time, it can be judged whether the wound has deteriorated and whether it is getting better. In the above patent, only fresh exudate at one time point can be collected, and subsequent exudates are all mixed together, and fresh exudate at another time point can no longer be obtained. Therefore, it is necessary to design a dedicated sampling and collection device to obtain fresh exudate at several different time points. Summary of the invention

[0004] The invention provides an exudate collecting device and a sampling method, which are used to solve the problem that the existing collecting device cannot collect fresh exudate at different time points.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A device for collecting and sampling exudate, wherein the main body of the sampling device is a shell body which is sealed on all sides and hollow inside, the shell body is divided into a first cavity and a second cavity on the left and right by a cavity partition plate, the upper surface of the first cavity is provided with a liquid inlet, two sets of upper and lower baffles are protruding inward on the inner wall of the first cavity, a floating plate is provided between the upper and lower baffles, the floating plate is provided with a concave hole which has the same shape and position as the baffles but is smaller in size than the baffles, the second cavity is divided into three cavities by upper and lower partition plates, sampling ports are respectively provided on the lower sides of the upper and lower cavities, and the first cavity is connected to the second cavity through a one-way valve.

[0006] Furthermore, the baffles are rectangular blocks, and silicone sealing layers are fixed to the lower surfaces of the upper group of baffles and the upper surfaces of the lower group of baffles respectively.

[0007] Furthermore, the outer ring of the floating plate is connected with a skirt, and the skirt forms a sealed space between the baffle and the inner wall of the first cavity.

[0008] Furthermore, the three cavities in the second cavity are respectively right cavity one, right cavity two and right cavity three from top to bottom.

[0009] Furthermore, a first one-way valve is arranged on the cavity partition plate on the lower side of the right first cavity, and a second one-way valve and a third one-way valve are arranged on the cavity partition plates on the upper side and the lower side of the right third cavity, respectively.

[0010] Furthermore, the first one-way valve and the second one-way valve control the liquid to flow from left to right, and the third one-way valve controls the liquid to flow from right to left.

[0011] Furthermore, the opening pressure of the third one-way valve is the pressure of the liquid in the right three chambers.

[0012] Furthermore, the volume of the right three chambers is greater than the volume of the space formed by the lower set of baffles and the first cavity.

[0013] Furthermore, the third one-way valve is located higher than the upper surface of the floating plate when it is at the lowest position; and the first one-way valve is located higher than the upper surface of a group of baffles above.

[0014] Furthermore, the sampling method is: S1: before the floating plate floats, it is the first sampling period, and sampling is performed at the initial time point of the period and any time point within the period; S2: The second sampling period is when the floating plate floats to the highest point until the first cavity is filled with liquid, and sampling is performed at the initial time point of the time period and at any time point within the time period.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The exudate collection and sampling device of the present invention is integrally sealed, suitable for use in a negative pressure drainage system, and can obtain fresh exudate at 2-4 time points for analysis; The present invention constructs two time periods through the cooperation of the floating plate and the baffle plate, and fresh seepage liquid can be collected in the corresponding time periods; The right two cavities of the present invention are hollow, which shortens the time of the intermediate period and meets the requirements of clinical sampling time; The present invention controls the flow of liquid in different directions through a one-way valve, thereby achieving the pushing of the floating plate and the construction of the time period. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of a device for collecting and sampling exudate according to an embodiment of the present invention; Figure 2 is a cross-sectional view of a device for collecting and sampling exudate according to an embodiment of the present invention from a first viewing angle; Figure 3 is a cross-sectional view of a device for collecting and sampling exudate according to an embodiment of the present invention from a second viewing angle; Figure 4 It is a structural schematic diagram of a floating plate in a device for collecting and sampling exudate according to an embodiment of the present invention; Figure 5 is a schematic diagram of a first state of a device for collecting and sampling exudate according to an embodiment of the present invention; Figure 6 is a schematic diagram of a second state of a device for collecting and sampling exudate according to an embodiment of the present invention; Figure 7 is a schematic diagram of a third state of a device for collecting and sampling exudate according to an embodiment of the present invention; Figure 8 It is a schematic diagram of a fourth state of a device for collecting and sampling exudate according to an embodiment of the present invention.

[0017] Among them, 10-shell, 11-liquid inlet, 12-first sampling port, 13-second sampling port, 100-first cavity, 110-upper left cavity, 120-lower left cavity, 131-first baffle, 132-second baffle, 141-third baffle, 142-fourth baffle, 200-second cavity, 210-right first cavity, 220-right second cavity, 230-right third cavity, 240-first partition plate, 250-second partition plate, 300-cavity partition plate, 310-first one-way valve, 320-second one-way valve, 330-third one-way valve, 400-floating plate, 410-skirt, 420-recessed hole. DETAILED DESCRIPTION

[0018] The embodiments of the invention will be described in detail below with reference to the accompanying drawings. It should be noted that the described embodiments are only part of the embodiments of the invention, rather than all the embodiments.

[0019] like Figure 1 As shown, the main body of the collection and sampling device is a shell 10 that is sealed on all sides and hollow inside. There is a liquid inlet 11 on the upper surface of the shell 10. The liquid inlet 11 is connected to a negative pressure drainage machine, and the drained liquid flows into the shell 10 through the liquid inlet 11.

[0020] like Figure 2 and Figure 3As shown, the housing 10 is divided into a first cavity 100 on the left and a second cavity 200 on the right by a cavity partition plate 300, and the liquid inlet 11 is located above the first cavity 100. The first cavity 100 and the second cavity 200 have the same volume, and can also be adjusted to different volumes according to actual needs.

[0021] The first cavity 100 is composed of two groups of baffles, the upper and lower baffles. The baffles of the same group are of the same size and are on the same plane. The baffles are rectangular in shape and protrude from the inner surface of the shell 10. From the cross-sectional view, the single-side baffles of the upper group of baffles are the first baffle 131 and the second baffle 132, and the single-side baffles of the upper group of baffles are the third baffle 141 and the fourth baffle 142.

[0022] There is a floating plate 400 between the upper set of baffles and the lower set of baffles. Figure 4 As shown, the shape of the floating plate 400 is similar to the shape of the cross section of the first cavity 100, but slightly smaller in size, so that the floating plate 400 can move between the two sets of baffles under the action of buoyancy. It is important that the four sides of the floating plate 400 are connected with a skirt 410 made of silicone, which can seal the space between the floating plate 400 and the inner wall of the first cavity 100; in addition, there are four concave holes 420 on the floating plate 400, the shape of the concave holes 420 is the same as the shape of the baffle but the size is smaller than the size of the baffle, and the center of the concave hole 420 coincides with the center of the baffle, the purpose of which is that when the concave hole 420 contacts the baffle, the baffle can completely cover the concave hole 420. The floating plate 400 divides the first cavity 100 into two upper and lower cavities, namely the upper left cavity 110 and the lower left cavity 120.

[0023] Of course, in order to achieve a better sealing effect, a silicone layer is provided on the lower surface of the upper set of baffles and the upper surface of the lower set of baffles to enhance the sealing effect.

[0024] The second cavity 200 is divided into three chambers by two upper and lower partition plates. The first partition plate 240 and the second partition plate 250 are fixed on the inner wall of the second cavity 200 and can be integrally formed during manufacturing. The first partition plate 240 and the second partition plate 250 divide the second cavity 200 into three chambers, which are the first right chamber 210, the second right chamber 220 and the third right chamber 230 from top to bottom. The volumes of the first right chamber 210, the second right chamber 220 and the third right chamber 230 are the same, and can also be set to different volumes as needed.

[0025] In the three cavities on the right side, a first sampling port 12 is arranged on the lower side wall of the right third chamber 230, and a second sampling port 13 is arranged on the lower side wall of the right first chamber 210. The first sampling port 12 and the second sampling port 13 are provided with switches for controlling the flow of the exudate. In addition, the first sampling port 12 and the second sampling port 13 can also be connected to an extension tube, and the extension tube is placed in the sampling tube for use to avoid splashing when the liquid is sampled.

[0026] The first cavity 100 and the second cavity 200 are circulated through a one-way valve, which is arranged on the cavity partition plate 300, and the positions thereof are as follows: a first one-way valve 310 is arranged on the cavity partition plate 300 near the lower side of the right first cavity 210, a second one-way valve 320 is arranged on the cavity partition plate 300 near the upper side of the right third cavity 230, and a third one-way valve is arranged on the cavity partition plate 300 near the lower side of the right third cavity 230. However, it should be noted that the installation directions of the one-way valves are different, the first one-way valve 310 and the second one-way valve 320 control the liquid to flow from left to right, and the third one-way valve 330 controls the liquid to flow from right to left. In addition, the position of the second one-way valve 320 is higher than the lowest position of the floating plate 400, that is, when the floating plate 400 is attached to a group of baffles below, the lowest point of the second one-way valve 320 is higher than the upper surface of the floating plate 400; at the same time, the lowest point of the first one-way valve 310 is higher than the upper surface of the group of baffles above.

[0027] The volume of the right third chamber 230 is larger than the space formed by the lower surface of the lower set of baffles and the bottom surface of the first cavity 100 .

[0028] like Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the working principle of the collection and sampling device is demonstrated.

[0029] like Figure 5 As shown, in the first time period of collection, the float plate 400 is attached to a group of baffles below due to gravity. At this time, the liquid flowing into the first cavity 100 from the liquid inlet 11 flows into the right three chambers 230 through the second one-way valve 320 until the right three chambers 230 are filled with liquid. At this time, the first time period ends. During this time period, the liquid at one time point or two time points can be sampled. When sampling one time point, the sample can be taken at any time point in the first time period. When sampling two time points, it is necessary to sample once at the beginning of the first time period and then sample at any time point in the first time period.

[0030] like Figure 6 and Figure 7As shown, during the second time period of collection, the right third chamber 230 is filled with liquid. At this time, the third one-way valve 330 is opened under the push of liquid pressure, and the liquid then enters the lower left chamber 120. As the liquid continues to flow through the second one-way valve, more and more liquid flows into the lower left chamber 120. When the liquid 120 contacts and pushes the float 400 upward to leave the lower group of baffles, the liquid will flow from the recessed hole 420, continuously pushing the float 400 upward, and the lower left chamber 120 gradually increases until the second time period ends when the float 400 contacts the lower surface of the upper group of baffles. No sampling is done during this time period. The right second chamber is a sealed structure and does not participate in the flow of liquid, which is also to reduce the time of this time period so that new sampling can be performed as soon as possible.

[0031] like Figure 8 As shown, during the third time period of collection, the liquid will flow from the upper left chamber 110 into the right chamber 210 through the first one-way valve 310. Also during this time period, the liquid can be sampled at one or two time points. When sampling one time point, the sample can be taken at any time point in the third time period. When sampling two time points, it is necessary to sample once at the beginning of the third time period and then sample at any time point in the third time period.

[0032] By taking a sample once at the beginning of a time period, fresh liquid is obtained. Also, because the amount is small, sampling can be done again after the liquid has accumulated for a period of time, and the influence of the initial small amount of liquid can be ignored.

[0033] In addition, in order to facilitate the observation of the collection of the exudate, the entire device is made of transparent material, and scale lines are set on the left and right cavities respectively to record the sampling points.

[0034] The above embodiments are not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device and method for collecting and sampling exudate, characterized in that: The main body of the sampling device is a shell that is sealed on all sides and hollow inside. The shell is divided into a first cavity and a second cavity on the left and right by a cavity partition plate. The upper surface of the first cavity is provided with a liquid inlet. Two sets of upper and lower baffles are protruding inward on the inner wall of the first cavity. There is a floating plate between the upper and lower baffles. The floating plate has a concave hole with the same shape and position as the baffle, but smaller in size than the baffle. The second cavity is divided into three cavities by upper and lower partition plates. Sampling ports are respectively arranged on the lower sides of the upper and lower cavities. The first cavity is connected to the second cavity through a one-way valve.

2. A device and method for collecting and sampling exudate according to claim 1, characterized in that: The baffles are rectangular blocks, and silicone sealing layers are fixed on the lower surfaces of the upper group of baffles and the upper surfaces of the lower group of baffles respectively.

3. The exudate collection and sampling device and sampling method according to claim 1, characterized in that: The outer circle of the floating plate is connected with a skirt, and the skirt forms a sealed space between the baffle and the inner wall of the first cavity.

4. The exudate collection and sampling device and sampling method according to claim 1, characterized in that: The three cavities in the second cavity are respectively the first right cavity, the second right cavity and the third right cavity from top to bottom.

5. A device and method for collecting and sampling exudate according to claim 4, characterized in that: A first one-way valve is arranged on the cavity partition plate at the lower side of the right first cavity, and a second one-way valve and a third one-way valve are arranged on the cavity partition plates at the upper side and the lower side of the right third cavity, respectively.

6. A device and method for collecting and sampling exudate according to claim 5, characterized in that: The first one-way valve and the second one-way valve control the liquid to flow from left to right, and the third one-way valve controls the liquid to flow from right to left.

7. A device and method for collecting and sampling exudate according to claim 6, characterized in that: The opening pressure of the third one-way valve is the pressure of the liquid in the right three chambers.

8. The exudate collection and sampling device and sampling method according to claim 7, characterized in that: The volume of the right three chambers is greater than the volume of the space formed by the lower set of baffles and the first cavity.

9. The exudate collection and sampling device and sampling method according to claim 8, characterized in that: The third one-way valve is located higher than the upper surface of the floating plate when it is at the lowest position; the first one-way valve is located higher than the upper surface of a group of baffles above.

10. The exudate collection and sampling device and sampling method according to claim 1, characterized in that: The sampling method is: S1: before the floating plate floats, it is the first sampling period, and sampling is performed at the initial time point of the period and any time point within the period; S2: The second sampling period is when the floating plate floats to the highest point until the first cavity is filled with liquid, and sampling is performed at the initial time point of the time period and at any time point within the time period.

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