Leak-proof primary-secondary specimen bag
By using a mother-daughter bag structure, formalin solution is pre-injected into the outer bag, and the flow is controlled by a self-sealing strip, which solves the problem of solution leakage during specimen preservation and achieves safe and efficient specimen handling.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUN YAT SEN UNIVERSITY CANCER CENTER (CANCER HOSPITAL AFFILIATED TO SUN YAT SEN UNIVERSITY CANCER RESEARCH INSTITUTE OF SUN YAT SEN UNIVERSITY)
- Filing Date
- 2025-08-26
- Publication Date
- 2026-07-24
AI Technical Summary
Formalin solution is prone to evaporation and leakage during specimen preservation, resulting in poor operational safety and affecting medical staff and the environment.
The specimen uses a mother-daughter bag structure. Formalin solution is pre-filled into the outer bag, and the flow of solution is controlled by the self-sealing strips of the inner and outer bags to ensure that there is no leakage during specimen preservation. The inner and outer bags can be connected when needed to facilitate specimen handling.
It effectively prevents the evaporation and leakage of formalin solution, improves operational safety, and protects the safety of medical personnel and the environment.
Smart Images

Figure CN224546819U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of medical devices, specifically, it relates to a leak-proof specimen bag. Background Technology
[0002] In medical and research settings, specimens need to be immersed in a neutral formalin solution. The standard procedure is to open the specimen bag, place the specimen inside, and then inject the formalin solution. However, in practice, errors or mistakes by medical personnel can lead to the evaporation and / or leakage of the formalin solution, thus affecting medical personnel and the environment.
[0003] Formalin is a well-known preservative, but it is highly corrosive and irritating. It is also a known carcinogen; inhalation or direct contact can severely irritate the skin, eyes, and mucous membranes, leading to respiratory congestion, allergic dermatitis, and other adverse effects. After absorption, it has an inhibitory effect on the central nervous system. Furthermore, the evaporation of formalin reduces the concentration of the formalin solution, which in turn lowers the concentration of the fixative, compromising the fixation of the specimen.
[0004] Therefore, there is an urgent need for a pathological specimen bag to prevent the formalin solution from evaporating or leaking during specimen preservation, thereby improving the safety of the operation and protecting medical staff (operators) and the surrounding environment from contamination. Utility Model Content
[0005] This utility model provides a leak-proof mother-daughter specimen bag to prevent the formalin solution from evaporating or leaking during specimen preservation, thereby improving operational safety and protecting medical personnel (operators) and the surrounding environment from contamination.
[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0007] A leak-proof mother-daughter specimen bag includes an inner bag constructed inside an outer bag along one edge of the outer bag. One end of the inner bag located at the edge of the outer bag is separated from the outside by a first self-sealing strip constructed therein. The other end of the inner bag extending into the outer bag is separated from the outer bag by a second self-sealing strip constructed therein. An injection port sealed by a sealing cap is constructed on the outer bag.
[0008] Furthermore, an outwardly extending sealing area is formed on the inner bag and at the first self-sealing strip.
[0009] Furthermore, the sealing area is integrally formed with the outer bag edge on the corresponding side.
[0010] Furthermore, a tear is provided at the location of the sealing area near the first self-sealing strip, and the tear is constructed on at least one side of the sealing area.
[0011] Furthermore, the outer bag and the inner bag are fixedly connected together at or near the location of the second self-sealing strip.
[0012] Furthermore, symmetrical pull tabs are constructed on the two opposite outer surfaces of the outer bag, respectively, at the second self-sealing strip.
[0013] Furthermore, the pull tab includes a pull piece or a pull ring, one end of which is on the outer surface of the outer bag.
[0014] Furthermore, the inner bag extends out of the outer bag from one end near the outer bag, and the first self-sealing strip is constructed on the portion of the inner bag that extends out of the outer bag.
[0015] Furthermore, the number of the first self-sealing strip and the second self-sealing strip is at least two, with the first self-sealing strips arranged side by side and the second self-sealing strips arranged side by side.
[0016] Furthermore, the injection port is fixedly installed on the edge of the outer bag, and the edge on which the inner bag is fixed to the outer bag is different from the edge on which the injection port is located.
[0017] The present invention, by adopting the aforementioned structure, achieves a technological advancement compared to existing technologies in the following ways: The present invention features a mother-daughter bag structure with an inner bag and an outer bag. Formalin solution is pre-filled into the outer bag through the injection port at the factory. When specimen soaking is required, the first self-sealing strip is opened. After opening the first self-sealing strip, the outer bag and inner bag are not connected, while the inner bag is connected to the outside. Then, using tweezers or other specialized tools, the specimen is placed inside the inner bag, and the first self-sealing strip is closed. Next, the formalin solution in the outer bag is introduced into the inner bag. Specifically, the second self-sealing strip is opened, at which point the interior of the outer bag and the interior of the inner bag are connected, allowing formalin solution to be supplied from the outer bag to the inner bag. Generally, the specimen remains in the inner bag. Alternatively, the second self-sealing strip can be slid into the outer bag. Regardless of whether the specimen is in the outer or inner bag, when it needs to be removed, it is always placed in the inner bag. The specific reason for this is... Due to the optimal position and reasonable size of the inner bag, subsequent specimen retrieval is more convenient and safer. Before retrieval, the formalin solution in the inner bag can be squeezed into the outer bag, and then removed using a special tool through the first self-sealing strip; alternatively, the second self-sealing strip can be closed, the specimen inside the inner bag can be positioned, the injection port can be opened, and the formalin solution in the outer bag can be discharged through the injection port. Then, the injection port can be closed, the second self-sealing strip opened, and the formalin solution in the inner bag can be released into the outer bag. Finally, the second self-sealing strip closed, the first self-sealing strip opened, and the specimen removed using a special tool. In summary, this invention injects the formalin solution into the outer bag at the factory, and the outer and inner bags are connected by the second self-sealing strip. This avoids the evaporation and leakage of the formalin solution during specimen preservation, improving operational safety and protecting medical personnel (operators) and the surrounding environment from contamination. This invention is applicable to the procedure of immersing specimens in formalin solution. Attached Figure Description
[0018] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.
[0019] In the attached diagram:
[0020] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;
[0021] Figure 2 This is another structural schematic diagram of an embodiment of the present utility model;
[0022] Figure 3 This is another structural schematic diagram of an embodiment of the present utility model;
[0023] Figure 4 This is another structural schematic diagram of an embodiment of the present utility model;
[0024] Figure 5 This is a partial cross-sectional view of the structure of the first and second self-sealing strips after they are closed, according to an embodiment of the present invention.
[0025] Figure 6 This is a partial structural cross-sectional view of the first and second self-sealing strips after they have been opened, according to an embodiment of the present invention.
[0026] Labeled components: 100-outer bag, 101-liquid storage chamber, 102-liquid inlet, 103-pull ring, 104-pull tab, 200-inner bag, 201-specimen placement chamber, 202-first self-sealing strip, 203-second self-sealing strip, 204-sealing area, 205-tear opening. Detailed Implementation
[0027] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.
[0028] This utility model discloses a leak-proof mother-daughter specimen bag, such as Figure 1-6As shown, the bag includes an outer bag 100 and an inner bag 200. The inner bag 200 is constructed inside the outer bag 100 and extends into the outer bag 100 through one edge. One end of the inner bag 200 located at the edge of the outer bag 100 is separated from the outside by a first self-sealing strip 202, which is constructed inside the corresponding portion of the inner bag 200. The other end of the inner bag 200 extending into the outer bag 100 is separated from the outer bag 100 by a second self-sealing strip 203, which is also constructed inside the corresponding portion of the inner bag 203. A liquid inlet 102, sealed by a sealing cap, is constructed on the outer bag 100. The working principle and advantages of this utility model embodiment are as follows: At the factory, formalin solution is pre-injected into the storage cavity 101 inside the outer bag 100 through the injection port 102. When specimen soaking is required, the first self-sealing strip 202 is opened. After opening the first self-sealing strip 202, the storage cavity 101 of the outer bag 100 and the specimen placement cavity 201 of the inner bag 200 are not connected, while the specimen placement cavity 201 of the inner bag 200 is connected to the outside. Then, using special tools such as tweezers, the specimen is placed in the specimen placement cavity 201 of the inner bag 200, and the first self-sealing strip 202 is closed. Close the container; then, transfer the formalin solution from the reservoir 101 of the outer bag 100 into the specimen placement cavity 201 of the inner bag 200. Specifically, open the second self-sealing strip 203. At this time, the reservoir 101 and the specimen placement cavity 201 are connected, and the formalin solution can be supplied from the reservoir 101 to the specimen placement cavity 201. Under normal circumstances, the specimen is always in the specimen placement cavity 201 of the inner bag 200. Alternatively, the second self-sealing strip 203 can be slid into the reservoir 101 of the outer bag 100. Whether in the outer bag 100 or the inner bag 200, when it is necessary to remove the specimen... The specimen was placed in the inner bag 200. The reason for this is that the optimal position and reasonable size of the inner bag 200 make subsequent specimen retrieval more convenient and safer. Before retrieval, the formalin solution in the specimen placement cavity 201 can be squeezed into the reservoir cavity 101 of the outer bag 100, and then removed using a special tool through the first self-sealing strip 202; alternatively, the second self-sealing strip 203 can be closed, with the specimen inside the inner bag 200, and the injection port 102 opened, allowing the formalin solution in the outer bag 100 to drain through the injection port 102, after which the injection port 102 can be closed. 2. Open the second self-sealing strip 203 to release the formalin solution in the inner bag 200 into the outer bag 100. Finally, close the second self-sealing strip 203, open the first self-sealing strip 202, and use a special tool to remove the specimen. In summary, the formalin solution of this invention is injected into the outer bag 100 at the time of manufacture. The outer bag 100 and the inner bag 200 are connected by the second self-sealing strip 203. This avoids the evaporation and leakage of formalin solution during specimen preservation, improves the safety of operation, and protects medical personnel (operators) and the surrounding environment from contamination.This invention applies to the procedure of immersing specimens in formalin solution.
[0029] As a preferred embodiment of this utility model, such as Figure 1-4 As shown, an outwardly extending sealing area 204 is formed on the inner bag 200 at the location of the first self-sealing strip 202. This sealing area 204 has two forms; the first type, as shown... Figure 1-2 As shown, the sealing area 204 is independently formed on the inner bag 200, that is, the end of the inner bag 200 near the outer bag 100 extends out of the outer bag 100, and the first self-sealing strip 202 is constructed on the part of the inner bag 200 that extends out of the outer bag 100; the second type is a form in which the sealing area 204 is connected to both the inner bag 200 and the outer bag 100, as shown in the example. Figure 3-4 As shown, the sealing area 204 is integrally formed with the edge of the outer bag 100 on the corresponding side. In this embodiment, in order to facilitate tearing open the sealing area 204 so that the inner bag 200 can communicate with the outside when the first self-sealing strip 202 is opened, and then the specimen can be placed or removed, a tear 205 is provided in the sealing area 204 near the first self-sealing strip 202. The tear 205 is constructed on at least one side of the sealing area 204.
[0030] As a preferred embodiment of this utility model, such as Figure 1-6 As shown, the outer bag 100 and the inner bag 200 are fixedly connected at or near the position of the second self-sealing strip 203. This ensures that when the outer walls of the outer bag 100 at the position of the second self-sealing strip 203 are separated, the second self-sealing strip 203 on the inner bag 200 also separates, allowing the inner bag 200 to communicate with the outer bag 100. To facilitate opening the second self-sealing strip 203, symmetrical pull tabs are constructed on two opposite outer surfaces of the outer bag 100 at the position of the second self-sealing strip 203. This allows medical personnel to open the second self-sealing strip 203 by pulling the pull tabs. The pull tabs can take the form of a pull tab 104 or a pull ring 103, with one end of the pull tab 104 or pull ring 103 corresponding to the outer surface of the outer bag 100.
[0031] In a preferred embodiment of the present invention, in order to improve the sealing performance, the means adopted is as follows: the number of the first self-sealing strip 202 and the second self-sealing strip 203 is at least two, the first self-sealing strip 202 is arranged side by side, and the second self-sealing strip 203 is also arranged side by side.
[0032] As a preferred embodiment of this utility model, such as Figure 1-2 As shown, the injection port 102 is fixedly installed on the edge of the outer bag 100, and the edge on which the inner bag 200 is fixed to the outer bag 100 is different from the edge on which the injection port 102 is located. This facilitates the injection of formalin solution into the outer bag 100 and the subsequent discharge operation.
[0033] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of the claims of this utility model.
Claims
1. A leak-proof mother-daughter specimen bag, characterized in that: It includes an inner bag constructed inside an outer bag along one edge of the outer bag, with one end of the inner bag located at the edge of the outer bag separated from the outside by a first self-sealing strip constructed therein, and one end of the inner bag extending into the outer bag separated from the outer bag by a second self-sealing strip constructed therein, and an injection port sealed by a sealing cap is constructed on the outer bag.
2. The leak-proof mother-daughter specimen bag according to claim 1, characterized in that: An outwardly extending sealing area is formed on the inner bag and at the first self-sealing strip.
3. The leak-proof mother-daughter specimen bag according to claim 2, characterized in that: The sealing area is integrally formed with the outer bag edge on the corresponding side.
4. The leak-proof mother-daughter specimen bag according to claim 2, characterized in that: A tear is provided at the location of the sealing area near the first self-sealing strip, and the tear is constructed on at least one side of the two sides of the sealing area.
5. The leak-proof mother-daughter specimen bag according to claim 1, characterized in that: The outer bag and the inner bag are fixedly connected together at or near the location of the second self-sealing strip.
6. A leak-proof mother-daughter specimen bag according to claim 5, characterized in that: Symmetrical pull tabs are constructed on the two opposite outer surfaces of the outer bag, respectively, at the second self-sealing strip.
7. A leak-proof mother-daughter specimen bag according to claim 6, characterized in that: The pull tab includes a pull tab or a pull ring, one end of which is on the outer surface of the outer bag.
8. The leak-proof mother-daughter specimen bag according to claim 1, characterized in that: The inner bag extends out of the outer bag from one end near the outer bag, and the first self-sealing strip is formed on the part of the inner bag that extends out of the outer bag.
9. A leak-proof mother-daughter specimen bag according to claim 1, characterized in that: The number of the first self-sealing strip and the second self-sealing strip is at least two, with the first self-sealing strips arranged side by side and the second self-sealing strips arranged side by side.
10. A leak-proof mother-daughter specimen bag according to claim 1, characterized in that: The injection port is fixedly installed on the edge of the outer bag, and the edge on which the inner bag is fixed to the outer bag is different from the edge on which the injection port is located.