Filtering device and negative pressure suction pump assembly

Abstract

The application relates to a filtering device and a negative pressure suction pump assembly, wherein the filtering device comprises a shell assembly, a closed cavity is formed in the shell assembly, a filtering piece is arranged in the cavity, the shell assembly comprises an upper shell and a lower shell connected with each other, one end of the lower shell towards the upper shell is provided with a sealing groove, the sealing groove is provided with a sealing piece, the upper shell is provided with a sterilization port, the sterilization port is communicated with the sealing groove, the sealing piece is closer to the cavity than the sterilization port, and the sealing piece can seal the cavity. Through the sterilization port, the gap between the upper shell and the lower shell is sterilized, meanwhile, the sealing piece is closer to the cavity than the sterilization port, the sealing piece can prevent pollutants from entering from the sterilization port, so that the cavity is sealed, and the sealing property of the filtering device is avoided from being damaged.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a filtration device and a negative pressure suction pump assembly. Background Technology

[0002] This section provides only background information relevant to this disclosure and is not necessarily prior art.

[0003] Peristaltic pumps are commonly used in medical devices as a negative pressure source. A peristaltic pump has a rotor with rollers that rotate with it. The rollers alternately squeeze and release fluid through a tubing. However, if plaque from the blood enters the peristaltic pump, it can cause blockage. Therefore, a filter is needed in the tubing to remove the plaque. Existing filters have complex sterilization processes or are not always thoroughly sterilized, making them prone to contamination. Summary of the Invention

[0004] The objective of this invention is to provide at least one filtration device that is convenient and thorough in sterilization, while maintaining the airtightness of the filtration unit. This objective is achieved through the following technical solution:

[0005] According to a first aspect of the present invention, a filtering device is provided, the filtering device comprising a housing assembly having a sealed cavity formed inside the housing assembly, a filter element disposed in the cavity, the housing assembly comprising an upper shell and a lower shell connected to each other.

[0006] The lower shell has a sealing groove at one end facing the upper shell, and a sealing element is provided in the sealing groove. The upper shell has a sterilization port, which is connected to the sealing groove. The sealing element is closer to the cavity than the sterilization port, and the sealing element can seal the cavity.

[0007] According to the above-mentioned filter device, a sealing groove is provided at one end of the lower shell facing the upper shell, and a sealing element is provided in the sealing groove. The upper shell is provided with a sterilization port, which is connected to the sealing groove. Thus, when the upper and lower shells have been connected, the gap between the upper and lower shells can be sterilized through the sterilization port. At the same time, the sealing element is closer to the cavity than the sterilization port. The sealing element can prevent contaminants from entering from the sterilization port, thereby sealing the cavity and avoiding damage to the airtightness of the filter device.

[0008] In addition, the filtration device according to the present invention may also have the following additional technical features:

[0009] In some embodiments of the present invention, the upper shell is provided with a first snap-fit ​​portion, the lower shell is provided with a second snap-fit ​​portion, and the upper shell and the lower shell are snap-fitted together through the first snap-fit ​​portion and the second snap-fit ​​portion.

[0010] In some embodiments of the present invention, the upper shell includes a top wall and a side wall circumferentially disposed around the edge of the top wall, the inner side of the side wall is provided with the first snap-fit ​​portion, and the outer side wall of the lower shell is provided with the second snap-fit ​​portion.

[0011] In this configuration, one of the first latching portion and the second latching portion is a protrusion, and the other is a slot.

[0012] In some embodiments of the present invention, the outer side wall of the lower shell is further provided with at least one protrusion and at least one support portion, the protrusion and the support portion are spaced apart, and the slot is defined between the protrusion and the support portion, the protrusion being disposed in the slot.

[0013] In some embodiments of the present invention, the projection of the sterilization port onto the cross-section of the filter device perpendicular to the axial direction falls on the projection of the protrusion onto the cross-section.

[0014] In some embodiments of the present invention, the protrusion is provided with a groove, and a first stop and / or a second stop are provided at intervals in the slot. When the protrusion enters the slot, one end of the protrusion passes over the surface of the second stop and abuts against one end of the first stop. At this time, the second stop is held in the groove.

[0015] In some embodiments of the present invention, the housing assembly is provided with an inlet and an outlet communicating with the cavity, and the filter element divides the cavity into a first cavity and a second cavity.

[0016] The filter element includes:

[0017] The filter section has a protrusion that forms a receiving section facing the interior of the second cavity;

[0018] A connecting part is arranged around the edge of the filter part, and the circumferential edge of the connecting part abuts against the inner wall of the cavity.

[0019] In some embodiments of the present invention, the filter element further includes: a flow guide portion disposed on and penetrating the side wall of the filter element, the flow guide portion having a flow guide groove communicating with the first cavity, and the inlet being located on one side of the flow guide portion and communicating with the first cavity through the flow guide groove.

[0020] In some embodiments of the present invention, the inner wall of the cavity is configured as a stepped structure along the axial direction of the cavity, the stepped structure including a first step and a second step, and a stepped surface is formed between the first step and the second step;

[0021] The upper shell is provided with a boss that protrudes towards the cavity, and the upper and lower ends of the connecting part abut against the stepped surface and the boss, respectively.

[0022] In some embodiments of the present invention, the filter element further includes: a drainage portion disposed on and penetrating the side wall of the filter element, the drainage portion having a drainage groove communicating with the first cavity, and the inlet being located on one side of the drainage portion and communicating with the first cavity through the drainage groove;

[0023] The second step is located near the bottom of the cavity. The second step is provided with a limiting groove. The limiting groove forms an opening on the side facing the upper shell for the drainage part to be inserted. The outer contour of the drainage part abuts against the inner wall of the limiting groove.

[0024] In some embodiments of the present invention, the housing assembly is provided with an input channel, one end of which communicates with the first cavity, the inlet is formed at the end of the input channel that communicates with the first cavity, and the other end of the input channel communicates with the outside of the housing assembly.

[0025] In some embodiments of the invention, the input channel extends from the side wall or bottom of the housing assembly to the bottom or near the bottom of the filter element, forming the inlet on the filter element.

[0026] According to a second aspect of the present invention, a negative pressure suction pump assembly is also provided, characterized in that the negative pressure suction pump assembly includes: a negative pressure pump; a filter device as described in the first aspect of the present invention; a first pipe connected to the inlet of the filter device; and a second pipe, wherein the outlet of the filter device is connected to the negative pressure pump through the second pipe. Attached Figure Description

[0027] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0028] Figure 1 A schematic diagram of the structure of a filtration device according to an embodiment is shown.

[0029] Figure 2 An exploded view of the components of a filter device according to one embodiment is shown schematically.

[0030] Figure 3 A schematic diagram of the structure of a filtering device from a top view of one embodiment is shown.

[0031] Figure 4 schematically shown Figure 3 A cross-sectional view of section AA.

[0032] Figure 5 A schematic diagram of the lower shell structure of one embodiment is shown.

[0033] Figure 6 A schematic diagram of the structure of a filter element according to one embodiment is shown.

[0034] Figure 7 A schematic cross-sectional view of portion AA in another embodiment is shown.

[0035] Figure 8 A schematic cross-sectional view of portion AA is shown in yet another embodiment. Detailed Implementation

[0036] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0037] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0038] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0039] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented as "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0040] "The axial direction of the filter device" refers to the direction of the line connecting the center of the upper shell and the center of the lower shell; it can also be understood as the thickness or height direction of the filter device. The axial direction of the components contained in the filter device is parallel to the "axial direction of the filter device".

[0041] An embodiment of the present invention provides a filtration device for filtering plaque in blood to prevent plaque from flowing into a negative pressure pump and causing blockage of the negative pressure pump.

[0042] like Figures 1 to 2 As shown, the filtration device 100 includes a housing assembly 10 and a filter element 20.

[0043] Combination Figure 3 and Figure 4The housing assembly 10 has a closed cavity inside, and the housing assembly 10 has an inlet 101 and an outlet 102 communicating with the cavity. A filter element 20 is disposed inside the cavity and separates the inlet 101 and the outlet 102. Blood enters the cavity through the inlet 101, is filtered by the filter element 20, and then flows out through the outlet 102. Specifically, the filter element 20 divides the cavity into a first cavity 131 and a second cavity 132. The inlet 101 communicates with the first cavity 131, and the outlet 102 communicates with the second cavity 132. The filter element 20 has a receiving portion 201 protruding towards the interior of the second cavity 132. The receiving portion 201 forms a receiving space 2011 on the side facing the first cavity 131, and the receiving space 2011 communicates with the first cavity 131. After the blood is filtered by the filter element 20, plaque in the blood accumulates in the receiving space 2011 and the first cavity 131.

[0044] In this embodiment, the receiving portion 201 protrudes towards the second cavity 132, and a receiving space 2011 communicating with the first cavity 131 is formed on the side of the receiving portion 201 facing the first cavity 131. This maximizes the overall volume of the receiving space 2011 and the first cavity 131 within the limited space of the cavity, thereby increasing the plaque capacity and reducing the blockage of the pipes and the filter device 100 caused by the small plaque capacity of the filter device 100 when there are many plaques in the blood. Furthermore, by providing the receiving portion 201 on the filter element 20, the filtration surface area of ​​the filter element 20 is increased, thus reducing the probability of the filter element 20 being blocked by plaques.

[0045] It should be noted that the receiving portion 201 can be a protrusion formed by a partial area of ​​the filter element 20 toward the second cavity 132, or it can be a protrusion formed by the entire filter element 20 toward the second cavity 132. In this embodiment, at least a portion of the inner sidewall of the filter element 20 includes an arc-shaped structure. In other embodiments, at least a portion of the inner sidewall of the filter element 20 includes a wavy structure, specifically an uneven structure. This wavy structure can further increase the filtration surface area of ​​the filter element 20, thereby further reducing the probability of the filter element 20 being blocked by plaque. At least a portion of the receiving portion 201 can be provided with an arc-shaped structure or a wavy structure.

[0046] See Figure 4 In this embodiment, the volume of the second cavity 132 near the outlet 102 is larger than the volume near the inlet 101. This arrangement is to allow more filtered blood to accumulate near the outlet 102 and less near the inlet 101, thereby facilitating the rapid flow of filtered blood out of the outlet 102 and increasing filtration efficiency.

[0047] In some embodiments of the present invention, such as Figure 2As shown, the housing assembly 10 includes an upper housing 11, a lower housing 12, and a seal 14. In one exemplary embodiment, please refer to [the following text is incomplete and requires further context: "to reiterate"] Figures 3 to 5 As shown, the lower shell 12 is generally cylindrical with one end open, and the upper shell 11 is generally shaped like a bottle cap. The upper shell 11 includes a top wall 112 and a side wall 111 surrounding the edge of the top wall 112. When the upper shell 11 seals the opening of the lower shell 12, the side wall 111 of the upper shell 11 is fitted over the lower shell 12.

[0048] Specifically, please combine Figure 5 As shown, the lower shell 12 has a receiving cavity 121 with an opening at one end, allowing the filter element 20 to be placed in or removed from the receiving cavity 121 through the opening. The upper shell 11 is detachably connected to the lower shell 12, and the upper shell 11 can cover the opening of the receiving cavity 121. A sealing member 14 is disposed between the upper shell 11 and the lower shell 12 to seal the gap between them. Thus, the receiving cavity 121 can be completely sealed by the upper shell 11 and the sealing member 14, i.e., the upper shell 11, the lower shell 12, and the sealing member 14 together define a sealed cavity. In this embodiment, the upper shell 11 is detachably connected to the lower shell 12. When there are many plaques accumulated inside the filter device 100, the accumulated plaques can be removed by disassembling the upper shell 11 and the filter element 20. After removing the plaques, the upper shell 11 is reinstalled to the lower shell 12 so that the suction operation can be continuously performed by the negative pressure pump, thereby improving the efficiency of plaque removal and saving surgical time.

[0049] In actual operation, sterilization is also included. The internal and external parts of the filter device 100 need to be sterilized at the same time. Specifically, the internal parts of the filter device 100 are sterilized first with the upper and lower shells of the filter device 100 open. Then, after the filter device 100 is assembled, the external parts of the filter device 100 are sterilized. During the assembly process, contaminants can easily enter the gap between the upper and lower shells, so the gap between the upper and lower shells needs to be sterilized.

[0050] In this embodiment, Figure 5 In the middle, the lower shell 12 has an annular sealing groove 128 surrounding the accommodating cavity 121 at one end facing the upper shell 11. The sealing element 14 is a sealing ring made of elastic material and is disposed in the sealing groove 128. When the upper shell 11 and the lower shell 12 are engaged, the top wall 112 and the lower shell 12 respectively squeeze the sealing element 14, causing the sealing element 14 to undergo elastic deformation and seal the accommodating cavity 121. See Figures 2-5 The upper shell 11 is provided with a sterilization port 110, which communicates with the sealing groove 128. The sealing element 14 is closer to the receiving cavity 121 than the sterilization port 110. In other embodiments, there can be multiple sealing grooves 128, which can be arranged around the receiving cavity 121.

[0051] An annular sealing groove 128 is provided around the accommodating cavity 121 at one end of the lower shell 12 facing the upper shell 11. The sealing groove 128 is equipped with a sealing element 14. The upper shell 11 is provided with a sterilization port 110, which communicates with the sealing groove 128. Thus, when the upper and lower shells are already connected, the gap between the upper and lower shells can be sterilized through the sterilization port 110. At the same time, the sealing element 14 is closer to the cavity than the sterilization port 110, and the sealing element 14 can prevent contaminants from entering through the sterilization port 110, thereby sealing the cavity and avoiding damage to the airtightness of the filter device. Here, "the sealing element 14 is closer to the cavity than the sterilization port 110" specifically means that when the upper and lower shells are already connected, the sterilization port 110 is located on the outer periphery of the sealing element 14.

[0052] Understandably, the upper shell 11 is provided with a first snap-fit ​​part, and the lower shell 12 is provided with a second snap-fit ​​part. The upper shell 11 and the lower shell 12 are connected by snap-fitting the first snap-fit ​​part and the second snap-fit ​​part.

[0053] Specifically, in this embodiment, a first snap-fit ​​portion 114 is provided on the inner side of the side wall 111 of the upper shell 11, and a second snap-fit ​​portion 15 is provided on the outer side wall 120 of the lower shell 12 to engage with the first snap-fit ​​portion 114. The upper shell 11 and the lower shell 12 are snapped together through the first snap-fit ​​portion 114 and the second snap-fit ​​portion 15, so as to facilitate the quick and convenient assembly and disassembly of the filter device 100, so as to quickly clean the plaque accumulated inside the filter device 100.

[0054] In one embodiment, such as Figure 4 and Figure 5 As shown, the first engaging portion 114 is a protrusion, and the second engaging portion 15 is a slot. Specifically, a supporting portion 125 is provided on the outer side wall 120 of the lower shell 12. The supporting portion 125 protrudes from the outer side wall 120 of the lower shell 12 and forms a supporting surface 1251 on the side facing the upper shell 11. The end of the upper shell 11 facing the lower shell 12 abuts against the supporting surface 1251, and the upper shell 11 can slide on the supporting surface 1251. At least one protrusion 126 is also provided on the outer side wall 120 of the lower shell 12. The protrusion 126 is located between the upper shell 11 and the supporting portion 125, and the protrusion 126 is spaced apart from the supporting portion 125, and a slot is defined between the protrusion 126 and the supporting surface 1251. When assembling the upper shell 11, the upper shell 11 is first placed over the lower shell 12 so that the end of the upper shell 11 facing the lower shell 12 abuts against the bearing surface 1251. Then, by rotating the upper shell 11, the protrusion rotates relative to the slot until the protrusion engages in the slot, thereby achieving a snap-fit ​​connection between the upper shell 11 and the lower shell 12. It can be understood that the bearing portion 125 can be a single integral structure, or the bearing portion 125 can have multiple parts, which are arranged opposite to multiple protrusions 126.

[0055] In one embodiment, the projection of the sterilization port 110 onto the projection of the protrusion 126 onto the cross-section of the filter device perpendicular to the axial direction. When gas sterilization is performed, the protrusion 126 can block the gap between the upper and lower shells, preventing the sterilization gas from escaping through the gap between the upper and lower shells. This allows the sterilization gas to enter the sealing groove 128 more concentratedly for sterilization, thereby improving the sterilization effect.

[0056] In this embodiment, when there are multiple protrusions 126, the number of bumps is the same as the number of protrusions 126, and each bump corresponds to one protrusion 126. Multiple protrusions 126 are arranged sequentially at intervals along the circumference of the lower shell 12, and the length of the gap between any two adjacent protrusions 126 is greater than the length of the bump, allowing the bump to pass through the gap between any two adjacent protrusions 126.

[0057] In this embodiment, the outer side wall 120 of the lower shell 12 is also provided with a first stop 127. The first stop 127 is located at one end or the middle of the slot. When the protrusion is inserted into the slot and moves to the end of the slot where the first stop 127 is provided, the first stop 127 abuts against the protrusion, thereby restricting the protrusion from continuing to move and preventing the protrusion from being inserted from one end of the slot and sliding out from the other end of the slot.

[0058] Furthermore, combined Figure 3 , Figure 4 and Figure 5 The protrusion has a groove 1141, and a first stop 127 and a second stop 129 are spaced apart within the groove. When the protrusion enters the groove, one end of the protrusion passes over the surface of the second stop 129 and abuts against one end of the first stop 127. At this time, the second stop 129 is engaged in the groove 1141, making it difficult to unscrew the upper shell 11 and the lower shell 12 in either clockwise or counterclockwise directions, thus further securing the upper shell 11 and the lower shell 12. In other embodiments, only the second stop 129 can be provided, and the second stop 129 is engaged in the groove 1141, which can also achieve the fixation between the upper shell 11 and the lower shell 12.

[0059] In another embodiment, the first engaging portion 114 is a slot, and the second engaging portion 15 is a protrusion. Specifically, at least one protrusion is provided on the outer side wall 120 of the lower shell 12, the protrusion being located on the outer side wall 120 of the lower shell 12 near the end of the upper shell 11. The top wall 112 of the upper shell 11 forms a bearing surface 1251 on the side facing the lower shell 12, and the end of the lower shell 12 facing the upper shell 11 abuts against the bearing surface 1251, and the lower shell 12 is slidable on the bearing surface 1251. At least one protrusion 126 is provided on the inner side of the side wall 111 of the upper shell 11, the protrusion 126 being spaced apart from the top wall 112, and a slot is defined between the protrusion 126 and the bearing surface 1251. When assembling the upper shell 11, the upper shell 11 is first placed on top of the lower shell 12, so that the end of the lower shell 12 facing the upper shell 11 abuts against the bearing surface 1251. Then, by rotating the upper shell 11, the protrusion rotates relative to the slot until the protrusion engages in the slot, thereby achieving a snap-fit ​​connection between the upper shell 11 and the lower shell 12. In this embodiment, when there are multiple protrusions 126, the number of protrusions is the same as the number of protrusions 126, and the protrusions correspond one-to-one with the protrusions 126. Multiple protrusions 126 are arranged sequentially at intervals along the circumference of the upper shell 11, and the length of the gap between any two adjacent protrusions 126 is greater than the length of the protrusion, so that the protrusion can pass through the gap between any two adjacent protrusions 126.

[0060] In some embodiments of the present invention, such as Figure 6 As shown, the filter element 20 includes a filter section 21, a connecting section 22, and a flow guiding section 23.

[0061] Specifically, please combine Figures 4 to 6 As shown, the filter section 21 protrudes towards the interior of the second cavity 132 to form a receiving section 201, making the receiving section 201 bowl-shaped, with the bowl opening facing the upper shell 11. The connecting section 22 is arranged around the edge of the filter section 21 and connected to the filter section 21. The connecting section 22 is annular in shape. When the filter element 20 is assembled to the lower shell 12, the circumferential edge of the connecting section 22 abuts against the inner wall of the receiving cavity 121, thereby dividing the receiving cavity 121 into a space facing the upper shell 11 (i.e., the first cavity 131) and a space away from the upper shell 11 (i.e., the second cavity 132). Furthermore, the abutment between the circumferential edge of the connecting section 22 and the inner wall of the receiving cavity 121 prevents plaque from flowing from between the filter element 20 and the inner wall of the receiving cavity 121 into the second cavity 132 and then into the negative pressure pump, causing blockage. In one exemplary embodiment, the filter section 21 includes a mesh member, the filter section 21 and the connecting section 22 are integrally structured, and the filter section 21 is bowl-shaped to increase the surface area of ​​the filter section 21 for filtration and reduce the probability of plaque clogging the filter element 20.

[0062] like Figure 5 and Figure 6As shown, the drainage section 23 is located on and penetrates the side wall of the filter element 20. Specifically, the drainage section 23 extends from the outer side of the filter element 21 and the connecting section 22 toward the inner wall of the receiving cavity 121 and abuts against the inner wall of the receiving cavity 121, avoiding gaps between the drainage section 23 and the inner wall of the receiving cavity 121. The drainage section 23 is provided with a drainage groove 231, which penetrates the drainage section 23. One end of the drainage groove 231 is connected to the receiving space 2011, and the other end of the drainage groove 231 is connected to the inlet 101. Blood carrying blockages such as thrombi and plaques flows smoothly into the filter element at the inlet under the drainage of the drainage section, thereby increasing the blood flow rate into the filter element and improving the filtration rate and efficiency. The top of the drainage channel 231 is open, and / or the bottom of the drainage channel 231 is flush with the bottom of the filter section 21. This design maximizes the axial cross-sectional area of ​​the drainage section, thereby increasing the blood flow rate into the filter section, preventing blood blockage, and improving the filtration rate. See also... Figure 6 In this embodiment, the cross section of the flow channel 231 in the axial direction of the filter device or the inlet position of the flow channel 231 is U-shaped. In other embodiments, it is not limited to U-shape and can be circular, elliptical or other shapes.

[0063] In other embodiments, the filter element 20 may not include the drainage portion 23, and the inlet 101 may be located on the side wall of the lower shell 12 above the filter element 20, in which case the overall thickness of the lower shell 12 is relatively thick. In other embodiments, the filter element 20 may not include the connecting portion 22, and the filter portion 21 directly abuts against the inner wall of the receiving cavity 121 through its circumferential edge.

[0064] In this embodiment, please refer to the following: Figure 4 and Figure 6 As shown, since the drainage section 23 is located on and penetrates the side wall of the filter element 20, and both the inlet 101 and the outlet 102 are located on the lower shell 12, and the inlet 101 and the outlet 102 are arranged circumferentially around the filter element 20, the mixture of blood and plaque flowing in from the inlet 101 is drained by the drainage channel 231 and flows from the side of the receiving space 2011 to the bottom of the receiving space 2011. In other embodiments, the inlet 101 may be located on the upper shell 11, and the outlet 102 may be located on the lower shell 12. However, compared to the scheme where the inlet 101 is located on the upper shell 11 and the outlet 102 is located on the lower shell 12, the scheme where both the inlet 101 and the outlet 102 are located on the lower shell 12 means that the pipe connecting the inlet 101 and the outlet 102 is only connected to the lower shell 12, making it easier to remove the upper shell 11 from the lower shell 12 for cleaning the filter device, and making operation more convenient.

[0065] In some embodiments of the present invention, please refer to Figure 5As shown, along the height direction of the accommodating cavity 121, i.e., from the bottom of the accommodating cavity 121 to its opening, the inner wall of the accommodating cavity 121 is configured with a stepped structure. The stepped structure includes a first step 122 located near the upper shell 11 and a second step 123 connected to the first step 122. The second step 123 is located on the side near the bottom of the accommodating cavity 121. Specifically, the inner diameter of the accommodating cavity 121 at the first step 122 is larger than the inner diameter of the accommodating cavity 121 at the second step 123, forming a stepped surface 124 between the first step 122 and the second step 123. When the filter element 20 is assembled to the lower shell 12, the end of the connecting part 22 facing the second cavity 132 abuts against the stepped surface 124. Figure 4 , Figure 5 and Figure 6 The upper shell 11 is provided with a boss 113, which is located on the side of the top wall 112 of the upper shell 11 facing the lower shell 12, and the boss 113 protrudes towards the receiving cavity 121. When the filter device 100 is in the assembled state, the end of the boss 113 facing the lower shell 12 abuts against the end of the connecting part 22 facing the first cavity 131, thereby limiting the filter element 20 by the boss 113 and the stepped surface 124, restricting the movement of the filter element 20 along the height direction of the receiving cavity 121, and improving the stability of the filter element 20 in the filtration process.

[0066] Furthermore, a limiting groove 1231 is provided in the second step 123. The limiting groove 1231 extends along the height direction of the accommodating cavity 121, and an opening is formed at the end of the limiting groove 1231 facing the upper shell 11. The flow guide 23 can be inserted into the limiting groove 1231 through the opening. The outer contour of the flow guide 23 abuts against the inner wall of the limiting groove 1231. Thus, the cooperation between the flow guide 23 and the limiting groove 1231 can quickly achieve the positioning between the filter element 20 and the lower shell 12, improving assembly efficiency. In addition, the cooperation between the flow guide 23 and the limiting groove 1231 can also restrict the rotation of the filter element 20 relative to the lower shell 12 around the axis of symmetry of the accommodating cavity 121, thereby further improving the stability of the filter element 20 during the filtration process. In other embodiments, the second step 123 can be an integral annular structure or multiple unit structures arranged around the inner wall of the accommodating cavity 121.

[0067] See Figure 4The housing assembly 10 is provided with an input channel 1011 and an output channel 1021. One end of the input channel 1011 is connected to the first cavity 131, and an inlet 101 is formed at the end of the input channel 1011 that is connected to the first cavity 131. The other end of the input channel 1011 is connected to the outside of the housing assembly 10. One end of the output channel 1021 is connected to the second cavity 132, and an outlet 102 is formed at the end of the output channel 1021. The other end of the output channel 1021 is connected to the outside of the housing assembly 10. In this embodiment, the input channel 1011 includes a first input channel 1012 and a second input channel 1013, wherein the inner diameter of the first input channel 1012 is larger than the inner diameter of the second input channel 1013, thereby facilitating the fixing of one end of the input pipe at the junction of the first input channel 1012 and the second input channel 1013. Similarly, the output channel 1021 includes a first output channel 1022 and a second output channel 1023, wherein the inner diameter of the first output channel 1022 is larger than the inner diameter of the second output channel 1023, thereby facilitating the fixing of one end of the output pipe at the junction of the first output channel 1022 and the second output channel 1023.

[0068] See Figure 7 In one embodiment, the second input channel 1013 includes a flared opening, the inner diameter of which gradually increases from one end to the other, connecting to the inlet 101, and then the end with the largest inner diameter connects to the inlet 101. In another embodiment, the input channel 1011 is generally flared, meaning the inner diameter of the input channel 1011 gradually increases from one end to the other, and then the end with the largest inner diameter connects to the inlet 101. This configuration increases the inlet flow rate, prevents blood carrying blood clots from clotting the inlet 101, and improves the filtration rate. It is understood that the output channel 1021 may also include a flared opening, for example, on the second output channel 1023, or on the entire output channel 1021.

[0069] In another embodiment, see Figure 8 The input channel 1011 extends from the side wall or bottom of the housing assembly to the bottom or near the bottom of the filter element 20, forming an inlet 101 on the filter element 20. When there are many blockages such as blood clots in the blood, placing the inlet 101 at the bottom or near the bottom of the filter element 20 allows the pressure of the liquid entering through the inlet 101 to flush away the blood clots deposited at the bottom of the filter element 20, thereby improving the filtration efficiency of the filter element 20.

[0070] See Figure 4 , Figure 7 and Figure 8In the axial direction of the filter device, the center of the inlet 101 is higher than the center of the outlet 102, and the outlet is located at the bottom of the second cavity 132. This design can prevent blood residue and thrombus floating in the filter device, and prevent residual liquid from contaminating the operating table during the opening of the filter device after aspiration.

[0071] According to an embodiment of the present invention, a negative pressure suction pump assembly is provided, comprising a negative pressure pump, a filter device 100, a first conduit, and a second conduit. Specifically, the outlet 102 of the filter device 100 is connected to the negative pressure pump through the second conduit. Blood drawn from the patient is filtered by the filter device 100 before flowing into the negative pressure pump. The negative pressure suction pump assembly proposed in this invention can be used to remove lesions and plaques accumulated in the blood vessels of a patient. In the implementation process, the distal end of the first conduit is connected to a distal access catheter, which extends into the lesion site of the blood vessel. The proximal end of the first conduit, along with the filter device 100, the negative pressure pump, and other components, are connected in sequence. The negative pressure pump is activated to draw the lesions and plaques out of the blood vessel through the distal access catheter and transport them through the first conduit to the filter device 100 for filtration, where they are then stored in the receiving space 2011 of the filter device 100. The negative pressure suction pump assembly proposed in this invention, through the filtration device 100, can prevent large plaques from the first pipe from entering the negative pressure pump and causing blockage and failure of the negative pressure pump. Furthermore, the plaques accumulated in the filtration device 100 can be manually cleaned by disassembling the upper shell 11 of the filtration device 100, thereby solving the blockage problem caused by large plaques.

[0072] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A filtration device, characterized in that, The filtration device includes a housing assembly with a sealed cavity inside, in which a filter element is disposed. The housing assembly includes an upper shell and a lower shell connected to each other. The lower shell has a sealing groove at one end facing the upper shell. The cavity includes a receiving cavity formed in the lower shell, and the filter element is placed in the receiving cavity. The sealing groove is annular and surrounds the receiving cavity. A sealing element is provided in the sealing groove. The upper shell has a sterilization port that communicates with the sealing groove. The sealing element is closer to the cavity than the sterilization port. Specifically, when the upper shell and the lower shell are connected, the sterilization port is located on the outer periphery of the sealing element, and the sealing element can seal the cavity.

2. The filtration device according to claim 1, characterized in that, The upper shell is provided with a first snap-fit ​​part, and the lower shell is provided with a second snap-fit ​​part. The upper shell and the lower shell are snap-fitted together through the first snap-fit ​​part and the second snap-fit ​​part.

3. The filtration device according to claim 2, characterized in that, The upper shell includes a top wall and a side wall circumferentially disposed around the edge of the top wall. The inner side of the side wall is provided with the first snap-fit ​​portion, and the outer side wall of the lower shell is provided with the second snap-fit ​​portion. In this configuration, one of the first latching portion and the second latching portion is a protrusion, and the other is a slot.

4. The filtration device according to claim 3, characterized in that, The outer side wall of the lower shell is also provided with at least one protrusion and at least one support portion, the protrusion and the support portion are spaced apart, and the slot is defined between the protrusion and the support portion, the protrusion being disposed in the slot.

5. The filtration device according to claim 4, characterized in that, The projection of the sterilization port onto the cross-section of the filter device perpendicular to the axial direction falls on the projection of the protrusion onto the cross-section.

6. The filtration device according to claim 3, characterized in that, The protrusion is provided with a groove, and a first stop and a second stop are provided at intervals in the slot. When the protrusion enters the slot, one end of the protrusion passes over the surface of the second stop and abuts against one end of the first stop. At this time, the second stop is held in the groove.

7. The filtration device according to claim 1, characterized in that, The housing assembly has an inlet and an outlet communicating with the cavity, and the filter element divides the cavity into a first cavity and a second cavity. The filter element includes: The filter section has a protrusion that forms a receiving section facing the interior of the second cavity; A connecting part is arranged around the edge of the filter part, and the circumferential edge of the connecting part abuts against the inner wall of the cavity.

8. The filtration device according to claim 7, characterized in that, The filter element further includes: a flow guide portion disposed on and penetrating the side wall of the filter element, the flow guide portion having a flow guide groove communicating with the first cavity, and the inlet being located on one side of the flow guide portion and communicating with the first cavity through the flow guide groove.

9. The filtration device according to claim 7, characterized in that, Along the axial direction of the cavity, the inner wall of the cavity is configured as a stepped structure, the stepped structure including a first step and a second step, and a stepped surface is formed between the first step and the second step; The upper shell is provided with a boss that protrudes towards the cavity, and the upper and lower ends of the connecting part abut against the stepped surface and the boss, respectively.

10. The filtration device according to claim 9, characterized in that, The filter element further includes: a flow guide portion disposed on and penetrating the side wall of the filter element, the flow guide portion having a flow guide groove communicating with the first cavity, and the inlet being located on one side of the flow guide portion and communicating with the first cavity through the flow guide groove; The second step is located near the bottom of the cavity. The second step is provided with a limiting groove. The limiting groove forms an opening on the side facing the upper shell for the drainage part to be inserted. The outer contour of the drainage part abuts against the inner wall of the limiting groove.

11. The filtration device according to claim 7, characterized in that, The housing assembly is provided with an input channel, one end of which is connected to the first cavity, and the inlet is formed at the end of the input channel that is connected to the first cavity. The other end of the input channel is connected to the outside of the housing assembly.

12. The filtration device according to claim 11, characterized in that, The input channel extends from the side wall or bottom of the housing assembly to the bottom or near the bottom of the filter element.

13. A negative pressure suction pump assembly, characterized in that, The negative pressure suction pump assembly includes: Negative pressure pump; The filtration device as described in any one of claims 1-12; The first pipe is connected to the inlet of the filter device; The outlet of the filter device is connected to the negative pressure pump via the second pipe.

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