Blood storing and filtering device with positive and negative pressure protection function

By setting up a filter and a positive and negative pressure safety valve in the blood storage filter, the problem of low reliability of negative pressure performance in the prior art is solved, and stable regulation of negative pressure and reduced surgical risks are achieved.

CN222854332UActive Publication Date: 2025-05-13NINGBO FLY MEDICAL PROD CO LTD
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Patent Information

Application Number
CN202421484612.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-06-26
Publication Date
2025-05-13
Estimated Expiration
2034-06-26

AI Technical Summary

Technical Problem

The existing closed blood storage blood filter has low reliability in negative pressure performance, resulting in increased surgical risks.

Method used

A blood storage blood filter with positive and negative pressure protection function was designed. By setting a filter in the blood storage bucket, a first and second space nested inside and outside are divided into the first and second spaces, and a drainage port, a negative pressure port and a positive and negative pressure safety valve are installed on the blood storage cover to achieve stable regulation of negative pressure.

Benefits of technology

It effectively improves the negative pressure stability of the blood storage blood filter, reduces the risk of surgery, and ensures safe blood reflux.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a blood storage filter with positive and negative pressure protection function, which comprises a blood storage barrel and a blood storage cover covering the blood storage barrel, a filter screen and a connecting funnel are arranged in the blood storage barrel, the connecting funnel is arranged on the filter screen, and the filter screen and the blood storage barrel are at least partially arranged at intervals. A first space and a second space located on the inner and outer sides of the filter screen are formed in the blood storage barrel; a drainage opening and a negative pressure opening are formed in the blood storage cover, the drainage opening is communicated to the first space, and the negative pressure opening is communicated to the second space; a positive and negative pressure safety valve is further arranged on the blood storage cover and connected to the first space, when the negative pressure in the first space is too high, the positive and negative pressure safety valve can be communicated with an external balance air source, the negative pressure in the first space is automatically reduced and stabilized, a negative pressure source with the large negative pressure can be selected, and it can be ensured that the provided blood drawing negative pressure is not too large or too small. According to the blood storage and filter with the positive and negative pressure protection function, the negative pressure stability of the blood storage and filter can be effectively improved, and the operation risk is reduced.
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Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a blood storage filter with positive and negative pressure protection functions. Background Art

[0002] The blood storage and filter is mainly used for autologous blood recovery in surgical operations. It absorbs and stores the blood during the operation, which can be used for subsequent analysis or blood transfusion. It also has the functions of defoaming and filtering, providing doctors with a bloodless and clear surgical field of view during surgery to improve surgical efficiency.

[0003] Blood is usually sucked by negative pressure, and the blood is sucked into the blood storage filter through the suction tube. In the existing closed blood storage filter, it does not have positive and negative pressure protection functions. When the negative pressure is small, the suction speed is slow, the operation time will be prolonged, and the operation risk will be increased; if the negative pressure is too large, it is easy to damage the red blood cells, which is not conducive to subsequent analysis or blood transfusion, and the damaged blood transfusion will affect the patient's life safety. That is, the negative pressure performance reliability of the closed blood storage filter in the existing technology is low, which will increase the risk of surgery. Utility Model Content

[0004] Based on this, the purpose of the utility model is to provide a blood storage filter with positive and negative pressure protection functions to solve the problem that the negative pressure performance reliability of the closed blood storage filter in the prior art is low and the surgical risk is increased.

[0005] The utility model provides a blood storage filter with positive and negative pressure protection functions, which comprises: a blood storage bucket and a blood storage cover arranged on the blood storage bucket, and a filter screen and a connecting funnel arranged in the blood storage bucket, wherein:

[0006] The connecting funnel is arranged on the filter screen, and the filter screen is at least partially spaced apart from the blood storage bucket to form a first space and a second space located inside and outside the filter screen in the blood storage bucket, and a bleeding port communicating with the second space is arranged at the bottom of the blood storage bucket;

[0007] The blood storage cover is provided with a drainage port and a negative pressure port, the drainage port is connected to the first space, and the negative pressure port is connected to the second space;

[0008] The blood storage cover is also provided with a positive and negative pressure safety valve, and the positive and negative pressure safety valve is connected to the first space.

[0009] Optionally, a retaining ring located at the position of the positive and negative pressure safety valve is also provided on the upper surface of the blood storage cover.

[0010] Optionally, the blood storage cover is further provided with a drug delivery port, and the drug delivery port is connected to the first space.

[0011] Optionally, the blood storage cover has a stepped structure, and the height decreases from the center to the edge, the drainage port is arranged on the side of the top step of the blood storage cover, the positive and negative pressure safety valves are arranged on the upper surface of the top step of the blood storage cover, the negative pressure port is arranged on the upper surface of the secondary step of the blood storage cover, and the drainage port, the positive and negative pressure safety valves and the negative pressure port are arranged sequentially and spaced along a radial direction of the blood storage cover.

[0012] Optionally, the filter screen includes an inner sponge filter screen and an outer nylon filter screen.

[0013] Optionally, the top step side of the blood storage cover also extends downward from the lower surface of the blood storage cover, and the lower surface of the blood storage cover is also provided with anti-rollover ribs, and the distance from the anti-rollover ribs to the top step side of the blood storage cover is consistent with the thickness of the top edge of the connecting funnel.

[0014] Optionally, the connecting funnel is further connected to a filter support via a buckle, and the outer side of the connecting funnel is further provided with a filter retaining ring located outside the filter support;

[0015] A supporting bowl is also provided at the bottom of the blood storage bucket so that the filter can be clamped between the filter bracket, the filter retaining ring and the supporting bowl, and an opening is also provided on the bottom surface of the supporting bowl.

[0016] Optionally, the sizes of the filter support and the filter decrease from top to bottom, and the side and bottom of the filter support are both hollow structures;

[0017] The bottom surface of the blood storage bucket is a boss structure, the support bowl is supported on the boss structure, and the top of the boss structure extends into the support bowl.

[0018] Optionally, a filter pressing block is further provided on the outer side of the connecting funnel, a filter supporting block is further provided on the top of the filter bracket, and the filter pressing block and the filter supporting block are staggered in the circumferential direction.

[0019] Optionally, a groove is provided on the top edge of the blood storage bucket, and a positioning column that is engaged and matched with the groove is provided on the lower surface of the blood storage cover.

[0020] The utility model provides a blood storage filter with positive and negative pressure protection functions, including: a blood storage bucket and a blood storage cover arranged on the blood storage bucket, and a filter screen and a connecting funnel arranged in the blood storage bucket, wherein the connecting funnel is arranged on the filter screen, and the filter screen and the blood storage bucket are at least partially spaced apart to form a first space and a second space located inside and outside the filter screen in the blood storage bucket; a drainage port and a negative pressure port are arranged on the blood storage cover, the drainage port is connected to the first space, and the negative pressure port is connected to the second space; a positive and negative pressure safety valve is also arranged on the blood storage cover, and the positive and negative pressure safety valve is connected to the first space. When the negative pressure port is connected to negative pressure, the negative pressure first affects the second space, and after transitioning through the filter screen, it affects the first space, and then induces negative pressure at the drainage port. The drainage port is connected to a blood drawing blood tube, so that the blood at the entrance of the blood drawing blood tube can be sucked into the first space, and then filtered by the filter screen before entering the second space. After the filter screen transitions, the negative pressure state in the first space is more stable. At the same time, the first space is connected to the positive and negative pressure safety valves. When the negative pressure in the first space is too high, the positive and negative pressure safety valves can be connected to the external balancing gas source to automatically reduce and stabilize the negative pressure in the first space. Through the setting of the positive and negative pressure safety valves, a negative pressure source with a larger negative pressure can be selected, which can avoid the negative pressure from becoming too small and the negative pressure from being too large. The blood storage filter with positive and negative pressure protection function of the utility model can effectively improve the negative pressure stability of the blood storage filter and reduce the risk of surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the main structure of the blood storage and blood filter with positive and negative pressure protection functions in the utility model;

[0022] Figure 2A It is a schematic diagram of the upper surface structure of the blood storage cover of the blood storage filter with positive and negative pressure protection functions in the utility model;

[0023] Figure 2B It is a schematic diagram of the lower surface structure of the blood storage cover of the blood storage filter with positive and negative pressure protection functions in the utility model;

[0024] Figure 3A It is a schematic diagram of the three-dimensional structure of the connecting funnel of the blood storage and blood filter with positive and negative pressure protection functions in the utility model;

[0025] Figure 3B It is a cross-sectional view of the connecting funnel of the blood storage and blood filter with positive and negative pressure protection functions in the utility model;

[0026] Figure 4 It is a cross-sectional view of the filter screen of the blood storage filter with positive and negative pressure protection function in the utility model;

[0027] Figure 5 It is a schematic diagram of the three-dimensional structure of the supporting bowl shaft of the blood storage and hemofilter with positive and negative pressure protection functions in the utility model;

[0028] Fig. 6AIt is a schematic diagram of the three-dimensional structure of the blood storage bucket of the blood storage filter with positive and negative pressure protection functions in the utility model;

[0029] Figure 6B It is a cross-sectional view of the blood storage bucket of the blood storage filter with positive and negative pressure protection function in the utility model;

[0030] Figure 7 It is a schematic diagram of the three-dimensional structure of the filter support of the blood storage filter with positive and negative pressure protection functions in the utility model.

[0031] The following specific implementation manner will further illustrate the present utility model in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0032] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0033] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0035] In order to solve the problem that the negative pressure performance reliability of the closed blood storage filter in the prior art is low and the surgical risk is increased, the utility model provides a blood storage filter with positive and negative pressure protection functions, the blood storage bucket is divided into a first space and a second space nested inside and outside by a filter screen, a drainage port, a negative pressure port and a positive and negative pressure safety valve are arranged on the blood storage cover, the drainage port and the positive and negative pressure safety valve are connected to the first space, and the negative pressure port is connected to the second space.

[0036] When in use, the negative pressure port is connected to a negative pressure source, the drainage port is connected to a blood drawing tube, and the positive and negative pressure safety valves are connected to an external safety gas source. After the negative pressure port is connected to negative pressure, the negative pressure first affects the second space, and after transitioning through the filter, it affects the first space, and then causes negative pressure at the drainage port, which can draw the blood at the entrance of the blood drawing tube into the first space, and then enter the second space after being filtered by the filter.

[0037] After the filter screen transitions, the negative pressure state in the first space is more stable. At the same time, the first space is connected to the positive and negative pressure safety valves. When the negative pressure in the first space is too high, the positive and negative pressure safety valves can be automatically opened to connect to the external safety gas source to automatically reduce and stabilize the negative pressure in the first space. Through the setting of the positive and negative pressure safety valves, a negative pressure source with a larger negative pressure can be selected, which can avoid the negative pressure from becoming too small and the negative pressure from being too large. The blood storage filter with positive and negative pressure protection function of the utility model can effectively improve the negative pressure stability of the blood storage filter and reduce the risk of surgery.

[0038] Specifically, Figure 1 As shown, the blood storage filter with positive and negative pressure protection functions of this embodiment includes a blood storage bucket 9, a blood storage cover 1 is sealed above the blood storage bucket 9, the inner bottom surface of the blood storage bucket 9 is a boss structure, and a connecting funnel 5, a filter screen 6 and a supporting bowl 7 are arranged from top to bottom between the boss structure and the blood storage cover 1. The filter screen 6 is fixed by connecting the funnel 5 and the supporting bowl 7. In the first space divided by the filter screen 6, a filter screen bracket 10 is also arranged to fix the filter screen 6 internally.

[0039] Further references Figure 2A and Figure 2B , wherein the locally enlarged area is an enlarged view of the drainage port 1.1. The blood storage cover 1 is a stepped structure. In the present embodiment, it is a two-step step. The first step 1.7 is a secondary step, and the second step 1.8 is a top step. The drainage port 1.1 is arranged at the side of the second step 1.8 and is lifted upward by 10° to 15°. The entrance of the drainage port 1.1 is a two-stage tooth buckle design, which is convenient for increasing the friction with the blood draw tube and improving the connection reliability. The tooth buckle is a conical surface, which can also facilitate the access of the blood draw tube.

[0040] The positive and negative pressure safety valve 3 is fixed to the blood storage cover 1 through the mounting hole 1.9. At the setting position of the positive and negative pressure safety valve 3, a retaining ring 1.5 is also provided on the upper surface of the blood storage cover 1 to prevent external pollutants from entering the blood storage barrel through the positive and negative pressure safety valve 3. At the same time, the retaining ring 1.5 can also be used for connection with an external safety air source.

[0041] When the external safety air source is the operating room air, when the positive and negative pressure safety valves 3 are opened, it is possible to inhale incompletely sterilized germs. Correspondingly, a drug delivery port 1.2 is also provided on the second step of the blood storage cover 1, and antibiotics, anticoagulants and other drugs can be added according to specific needs.

[0042] The negative pressure port 1.6 is arranged on the upper surface of the first step 1.7. The negative pressure port 1.6, the positive and negative pressure safety valves 3, the drug delivery port 1.2 and the drainage port 1.1 are arranged in sequence along a radial direction of the blood storage cover 1. The negative pressure first affects the positive and negative pressure safety valves 3, which can improve the response speed of the negative pressure stable regulation and improve the stability of the negative pressure regulation.

[0043] In this embodiment, three drainage ports 1.1 are provided to increase the blood drawing speed, and the specific setting number or activation number can be selected according to specific needs; two drug administration ports 1.2 are provided to facilitate drug administration, and the specific design number can be selected according to specific needs.

[0044] In the idle state, to ensure the overall sealing, the negative pressure port 1.6 is covered with a negative pressure port protective cap 11, the medication port 1.2 is covered with a Luer protective cap 2, the drainage port 1.1 is covered with a drainage port protective cap 4, the bleeding port is covered with a bleeding port protective cap 8, and the positive and negative pressure safety valves 3 are self-sealing and do not need special sealing. To facilitate the installation of the Luer protective cap 2, a trapezoidal frustum 1.3 is provided at the root of the medication port 1.2.

[0045] The side of the second step 1.8 extends toward the lower surface of the blood storage cover 1 to form a first annular boss 1.13. On the periphery of the first annular boss 1.13, the lower surface of the blood storage cover 1 is also provided with an anti-rollover rib 1.11. The anti-rollover rib 1.11 is spaced apart from the first annular boss 1.13, and the spacing is consistent with the thickness of the top edge of the connecting funnel 5, so as to facilitate docking and positioning with the connecting funnel 5.

[0046] Further references Fig. 6A and Figure 6B The outer side of the blood storage cover 1 is also provided with an extension 1.4, and the top of the blood storage bucket 9 is provided with a supporting edge 9.3, and the extension 1.4 and the supporting edge 9.3 match to support the blood storage cover 1. The peripheral side of the blood storage cover 1 is also provided with an inner connecting retaining ring 1.12, and the top edge of the blood storage bucket 9 forms a second annular boss 9.1, and the inner connecting retaining ring 1.12 and the second annular boss 9.1 are aligned and matched, so that the blood storage cover 1 can be positioned on the blood storage bucket 9.

[0047] The second annular boss 9.1 is provided with a groove 9.2, and the lower surface of the blood storage cover 1 is provided with a positioning column 1.10. The groove 9.2 and the positioning column 1.10 are complementary and matched, which is convenient for alignment and engagement to realize the positioning of the blood storage cover 1. The docking structure such as the first annular boss 1.13 inside the blood storage cover 1 is a non-standard circle. Through the positioning of the positioning column, it can be prevented from rotating after docking, which can improve the subsequent sealing processing effect and ensure the sealing reliability. The groove 9.2 is preferably a U-shaped groove, and the end of the positioning column 1.10 is preferably a U-shaped structure, which is convenient for the smoothness of positioning and docking.

[0048] Please refer to further Figure 3A and Figure 3BIn this embodiment, the top edge of the connecting funnel 5 forms an external connecting retaining ring 5.1, which matches the first annular boss 1.13 of the blood storage cover 1, and the connecting funnel 5 and the blood storage cover 1 can be positioned internally.

[0049] The inner wall of the connecting funnel 5 is set as a drainage arc surface 5.4, which facilitates the inhaled blood to flow down to the filter below. The horizontal cross-sectional size of the first space decreases from top to bottom, which facilitates the inhaled blood to gradually flow downward, making full use of various parts of the filter 6 to achieve filtration and improve the filtration effect.

[0050] In order to facilitate the installation of the filter bracket 10, a buckle 5.2 is provided on the outer side of the connecting funnel 5, and the connecting funnel 10 can be stably fixedly connected to the connecting funnel 5 through the buckle 5.2.

[0051] At the same time, to achieve the fixing of the filter 6, please refer to Figure 4 , Figure 5 and Figure 7 The filter 6 includes an inner sponge filter 6.1 and an outer nylon filter 6.2, which have a certain thickness and toughness. A filter retaining ring 5.6 and a filter pressing block 5.5 are also provided on the outer side of the connecting funnel 5. A filter support block 10.1 is provided on the top of the filter bracket 10. The filter retaining ring 5.6 and the side of the supporting bowl 7 limit the outer side of the upper and lower ends of the filter 6. The filter pressing block 5.5, the filter bracket 10 and its filter support block 10.1 limit the inner side of the filter 6, so that the filter can be stably clamped and fixed.

[0052] In order to reduce the obstruction of the filter support 10 to filtration, in the present embodiment, the filter support 10 is a hollow structure as a whole, the side wall is composed of a transverse ring 10.2 and a longitudinal strip 10.4, and the bottom surface is composed of an annular support base 10.3. The size of each part can be specifically selected according to the strength requirements and filtering effect of the design, and the present application does not make any special restrictions on this.

[0053] The filter screen pressing blocks 5.5 and the filter screen supporting blocks 10.1 are staggeredly arranged along the circumferential direction, and effective support can be provided with fewer structures to stably fix the top of the filter screen 6 to the connecting funnel 5.

[0054] To improve the filtering efficiency, in the present embodiment, an arc groove 5.3 is further provided on the side wall of the connecting funnel 5. The setting position of the arc groove 5.3 is consistent with the setting position of the buckle 5.2 and the filter screen pressing block 5.5. The buckle 5.2 and the filter screen pressing block 5.5 are respectively located below and above the window area of ​​the arc groove 5.3. The filter screen 6 is located on the outside of the filter screen pressing block 5.5, which can ensure that the blood output from the arc groove 5.3 can be effectively filtered.

[0055] The bottom surface of the supporting bowl 7 is provided with a mounting circular hole 7.2 and a blood leakage hole 7.1. The inner bottom surface of the blood storage bucket 9 is a boss structure, and a trapezoidal boss 9.4 is formed at the upper end of the boss structure. The mounting circular hole 7.2 on the bottom surface of the supporting bowl 7 can be sleeved to the trapezoidal boss 9.4 and fixed. The blood leakage hole 7.1 can prevent the suctioned blood from being stored in the dehydration bowl 7, and facilitates the complete discharge of the blood in the blood storage bucket 9. In order to ensure effective filtration, the filter screen 6 can be a barrel shape so as to completely filter and prevent part of the blood from entering the second space directly through the blood leakage hole 7.1 without being filtered.

[0056] In order to facilitate the complete discharge of blood in the blood storage bucket 9, in this embodiment, the bottom surface of the blood storage bucket 9 is an inclined surface, and the bleeding port 9.5 is arranged at the lowest point of the bottom surface of the blood storage bucket 9, so that the blood in the blood storage bucket 9 naturally gathers to the bleeding port 9.5 under the action of gravity.

[0057] The utility model of the blood storage filter with positive and negative pressure protection function can be used for autologous blood recovery in surgical operations. During use, the blood storage filter is installed on a special bracket on the blood recovery machine, and each sealing cap is removed, and the corresponding blood supply line, air extraction tube and bleeding connector are connected. The vacant drainage port keeps the sealing cap closed, and after adding the pre-flushing liquid, it is shaken vigorously to make the filter element and the blood storage barrel cavity fully moistened, and then connected to the centrifugal cup pipeline for use. The blood storage filter is easy to connect and has positive and negative pressure protection. The negative pressure of blood drawing is stable, which is safer in clinical use, can effectively reduce surgical risks, and improve surgical efficiency.

[0058] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0059] The above-mentioned embodiments only express several specific implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A blood storage filter with positive and negative pressure protection function, characterized in that: include: A blood storage bucket and a blood storage cover arranged on the blood storage bucket, as well as a filter screen and a connecting funnel arranged in the blood storage bucket, wherein: The connecting funnel is arranged on the filter screen, and the filter screen is at least partially spaced apart from the blood storage bucket to form a first space and a second space located inside and outside the filter screen in the blood storage bucket, and a bleeding port communicating with the second space is arranged at the bottom of the blood storage bucket; The blood storage cover is provided with a drainage port and a negative pressure port, the drainage port is connected to the first space, and the negative pressure port is connected to the second space; The blood storage cover is also provided with a positive and negative pressure safety valve, and the positive and negative pressure safety valve is connected to the first space.

2. The blood storage filter with positive and negative pressure protection function according to claim 1, characterized in that: The upper surface of the blood storage cover is also provided with a retaining ring located at the position of the positive and negative pressure safety valve.

3. The blood storage filter with positive and negative pressure protection function according to claim 1, characterized in that: The blood storage cover is also provided with a drug delivery port, and the drug delivery port is connected to the first space.

4. The blood storage filter with positive and negative pressure protection function according to claim 1, characterized in that: The blood storage cover is of a stepped structure, and the height decreases from the center to the edge. The drainage port is arranged on the side of the top step of the blood storage cover, the positive and negative pressure safety valves are arranged on the upper surface of the top step of the blood storage cover, and the negative pressure port is arranged on the upper surface of the secondary step of the blood storage cover, and the drainage port, the positive and negative pressure safety valves and the negative pressure port are arranged sequentially and spaced along a radial direction of the blood storage cover.

5. The blood storage filter with positive and negative pressure protection function according to claim 1, characterized in that: The filter screen comprises an inner sponge filter screen and an outer nylon filter screen.

6. The blood storage filter with positive and negative pressure protection function according to claim 4, characterized in that: The top step side edge of the blood storage cover also extends downward from the lower surface of the blood storage cover, and the lower surface of the blood storage cover is also provided with anti-rollover ribs, and the distance from the anti-rollover ribs to the top step side edge of the blood storage cover is consistent with the thickness of the top edge of the connecting funnel.

7. The blood storage filter with positive and negative pressure protection function according to claim 1, characterized in that: The connecting funnel is also connected to a filter support via a buckle, and the outer side of the connecting funnel is also provided with a filter retaining ring located outside the filter support; A supporting bowl is also provided at the bottom of the blood storage bucket so that the filter can be clamped between the filter bracket, the filter retaining ring and the supporting bowl, and an opening is also provided on the bottom surface of the supporting bowl.

8. The blood storage filter with positive and negative pressure protection function according to claim 7, characterized in that: The sizes of the filter support and the filter decrease from top to bottom, and the sides and bottom of the filter support are both hollow structures; The bottom surface of the blood storage bucket is a boss structure, the support bowl is supported on the boss structure, and the top of the boss structure extends into the support bowl.

9. The blood storage filter with positive and negative pressure protection function according to claim 7, characterized in that: A filter pressing block is also arranged on the outer side of the connecting funnel, a filter supporting block is also arranged on the top of the filter bracket, and the filter pressing block and the filter supporting block are staggered in the circumferential direction.

10. The blood storage filter with positive and negative pressure protection function according to claim 1, characterized in that: The top edge of the blood storage bucket is provided with a groove, and the lower surface of the blood storage cover is provided with a positioning column that is engaged and matched with the groove.