Soft shell leukocyte filter assembly heat-seal integrated jig

Abstract

The application discloses a soft shell leukocyte filter assembly hot combination integrated jig, which comprises a bottom plate, a membrane positioning assembly, a filter material positioning assembly, a catheter positioning assembly, an inner membrane hot combination lower die and an outer membrane hot combination lower die are arranged on the bottom plate; the filter material positioning assembly and the catheter positioning assembly are movable parts, and after being moved outward, the membrane positioning assembly can be exposed. The present application is a composite jig, has multiple functions, the membrane positioning assembly positions two layers of inner membranes and two layers of outer membranes, the filter material positioning assembly positions filter materials, the catheter positioning assembly positions catheters and support parts, the inner membrane hot combination lower die and the outer membrane hot combination lower die cooperate with a high-frequency hot combination machine to realize hot combination, so that the hot combination processing of the soft shell filter can be completed on the same jig, each functional component is designed ingeniously, does not interfere with each other, and has the characteristics of accurate positioning, high automation degree and convenient operation.

Description

Technical Field

[0001] This invention relates to the field of medical device manufacturing equipment technology, specifically to an assembly heat-sealed integrated fixture for a soft-shell leukocyte filter. Background Technology

[0002] Removing non-therapeutic components, such as leukocytes, during blood transfusions and clinical treatments has many benefits, which is now widely recognized. The most effective method is leukocyte filtration using a leukocyte filter. Currently, the most widely used leukocyte filters are rigid-shell filters made of ABS or PC injection molded parts. However, rigid-shell filters are susceptible to damage during high-speed centrifugation. Based on this, patent documents CN104998311A and CN102861365B each disclose a soft-shell leukocyte filter. Its shell will not break during high-speed blood centrifugation, preventing leakage and contamination. It also boasts advantages such as a simple and aesthetically pleasing design and high material utilization.

[0003] The above-mentioned soft-shell filter preparation method consists of two steps: (a) preparation of the filter membrane assembly, in which a PVC inner membrane ring, a combined filter material and another PVC inner membrane ring are stacked in sequence, and then the inner edge of the PVC inner membrane ring is sealed to the outer edge of the combined filter membrane by high-frequency heat sealing; (b) peripheral heat sealing, in which a PVC outer membrane, an inlet conduit, a filter membrane assembly, a support, an outlet conduit and another PVC outer membrane are stacked in sequence, and then the edges of the PVC inner membrane ring and the PVC outer membrane in the filter membrane assembly are sealed by high-frequency heat sealing, while the pre-filtration liquid chamber is provided with an inlet conduit and the post-filtration liquid chamber is provided with an outlet conduit and a support.

[0004] When using the above process to prepare soft-shell filters, the various components of the soft-shell filter need to be assembled in an orderly and precise manner before high-frequency heat sealing treatment. In order to ensure efficient and high-yield production, it is necessary to design special fixtures. Summary of the Invention

[0005] To achieve efficient and high-yield production of soft-shell leukocyte filters, this invention provides an integrated heat-sealing fixture for assembling soft-shell leukocyte filters.

[0006] The technical solution adopted in this invention is as follows: an assembly heat-sealing integrated fixture for a soft-shell leukocyte filter, comprising a base plate, wherein a membrane positioning component, a filter media positioning component, a conduit positioning component, an inner membrane heat-sealing lower mold, and an outer membrane heat-sealing lower mold are provided on the base plate; the filter media positioning component and the conduit positioning component are movable parts, and the membrane positioning component can be exposed after being moved outward.

[0007] Preferably, the membrane positioning assembly includes a support block and a plurality of positioning pins arranged on the support block. The support block is made of insulating material. The inner membrane heat-sealing lower mold and the outer membrane heat-sealing lower mold are embedded in the support block to form a membrane support surface.

[0008] Preferably, a first auxiliary support block is provided in the middle of the inner membrane heat-sealing lower mold, and a second auxiliary support block is provided in the gap between the inner membrane heat-sealing lower mold and the outer membrane heat-sealing lower mold. Both the first auxiliary support block and the second auxiliary support block are made of insulating material.

[0009] Preferably, the filter media positioning components are arranged in pairs, respectively on both sides of the membrane positioning components; including limiting plates, the limiting plates are made of insulating material, the two opposite surfaces of the two limiting plates form limiting notches for the filter media, the limiting plates are installed on the first slide, and move towards or away from each other under the drive of the first drive cylinder.

[0010] Preferably, the catheter positioning assembly includes a positioning rod, a flipping shaft, a second slide, and a second drive cylinder. The positioning rod is made of conductive material, and its front end forms the insertion and mounting part of the catheter. The tail end of the positioning rod is mounted on the flipping shaft and flips along the flipping shaft. The flipping shaft is mounted on the second slide and moves toward or away from the membrane positioning assembly under the drive of the second drive cylinder.

[0011] Preferably, a rotating handle is installed at the end of the flipping shaft.

[0012] Preferably, the rotary handle is equipped with a stop device and a positioning sensor.

[0013] Preferably, a support base is installed on the positioning rod corresponding to the liquid outlet conduit.

[0014] Preferably, the front end of the positioning rod is provided with a limiting step.

[0015] Preferably, multiple soft-shell leukocyte filters are arranged side by side at their assembly heat-sealing positions.

[0016] The present invention has the following beneficial effects: The present invention is a composite fixture with multiple functions. The membrane positioning component positions the two inner membranes and the two outer membranes, the filter media positioning component positions the filter media, the conduit positioning component positions the conduit and the support, and the inner membrane heat sealing lower mold and the outer membrane heat sealing lower mold work together with a high-frequency heat sealing machine to achieve heat sealing. Therefore, the heat sealing process of the soft shell filter can be completed on the same fixture. The functional components are ingeniously designed and do not interfere with each other. It has the characteristics of accurate positioning, high degree of automation and convenient operation. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the fixture in an embodiment of the present invention.

[0018] Figure 2 This is a schematic diagram of the membrane positioning component in the fixture of an embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram of the filter media positioning assembly in the fixture of an embodiment of the present invention (only one set is shown).

[0020] Figure 4 This is a schematic diagram of the catheter positioning assembly in the fixture of this invention (one set is in a rotated and lifted state).

[0021] Figure 5 This is an enlarged schematic diagram of point A in the fixture of an embodiment of the present invention.

[0022] Base plate 1;

[0023] Membrane positioning component 2, support block 201, positioning pin 202, first auxiliary support block 203, second auxiliary support block 204;

[0024] Filter media positioning assembly 3, limiting plate 301, filter media limiting notch 302, slide table 303, drive cylinder 304;

[0025] The conduit positioning assembly 4, positioning rod 401, flipping shaft 402, second slide 403, second drive cylinder 404, rotating handle 405, stop device 406, position sensor 407, support base 408, and limit step 409.

[0026] Inner membrane heat-sealed lower mold 5;

[0027] The outer membrane is heat-sealed into the lower mold 6;

[0028] Inner membrane 01, outer membrane 02, filter media 03, conduit 04, support component 05. Detailed Implementation

[0029] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0030] In the embodiments, such as Figures 1-5 The image shows an integrated heat-sealing fixture for assembling a soft-shell leukocyte filter. It includes a base plate 1, on which are mounted a membrane positioning assembly 2, a filter media positioning assembly 3, a conduit positioning assembly 4, an inner membrane heat-sealing lower mold 5, and an outer membrane heat-sealing lower mold 6. The filter media positioning assembly 3 and the conduit positioning assembly 4 are movable components; moving them outwards exposes the membrane positioning assembly 2. This embodiment is a composite fixture with multiple functions. The membrane positioning assembly 2 positions the two inner membranes 01 and the two outer membranes 02; the filter media positioning assembly 3 positions the filter media 03; and the conduit positioning assembly 4 positions the conduits 04 (including the inlet and outlet conduits) and the support 05. The inner membrane heat-sealing lower mold 5 and the outer membrane heat-sealing lower mold 6, when used with a high-frequency heat-sealing machine, achieve heat sealing. The heat sealing of the soft-shell filter can be completed on the same fixture. The functional components are cleverly designed and do not interfere with each other, featuring precise positioning, high automation, and convenient operation.

[0031] In the embodiments, such as Figure 2 As shown, the membrane positioning assembly 2 includes a support block 201 and multiple positioning pins 202 arranged on the support block 201. The support block 201 is made of insulating material. The inner membrane heat-sealing lower mold 5 and the outer membrane heat-sealing lower mold 6 are embedded in the support block 201 to form a membrane support surface. The membrane positioning assembly 2 has four assembly heat-sealing positions, and the inner membrane heat-sealing lower mold 5 and the outer membrane heat-sealing lower mold 6 each have four positions. The inner membrane 01 and the outer membrane 02 are a single, four-in-one membrane for easy operation. Each of the four corners of each assembly heat-sealing position has a positioning pin 202 to ensure accurate positioning of the inner membrane 01 and the outer membrane 02 and to avoid wrinkles.

[0032] In the embodiments, such as Figure 2 As shown, a first auxiliary support block 203 is provided in the inner membrane heat-sealing lower mold 5, and a second auxiliary support block 204 is provided in the gap between the inner membrane heat-sealing lower mold 5 and the outer membrane heat-sealing lower mold 6. Both the first auxiliary support block 203 and the second auxiliary support block 204 are made of insulating material. The support block 201, the first auxiliary support block 203, and the second auxiliary support block 204 together form a complete membrane support surface, providing good support for the inner membrane 01 and the outer membrane 02 and ensuring flatness.

[0033] In the embodiments, such as Figure 3 As shown, the filter media positioning assembly 3 consists of two pairs, arranged on opposite sides of the membrane positioning assembly 2. Each pair includes a limiting plate 301 made of insulating material. The two opposing surfaces of the two limiting plates 301 form limiting notches 302 for the filter media. The limiting plates 301 are mounted on a first sliding table 303 and move towards or away from each other under the drive of a first driving cylinder 304. This embodiment uses a pneumatic clamping mechanism to position the filter media 03, allowing the limiting plates 301 to be easily removed from above the membrane positioning assembly 2, facilitating the insertion or removal of the inner membrane 01, outer membrane 02, filter membrane assembly, and finished product. The operation is convenient. By replacing the limiting plates 301, the positioning of filter media 03 of different shapes can also be accommodated.

[0034] In the embodiments, such as Figure 4As shown, the catheter positioning assembly 4 includes a positioning rod 401, a flipping shaft 402, a second slide 403, and a second drive cylinder 404. The positioning rod 401 is made of conductive material, and its front end forms the insertion and mounting part of the catheter. The tail end of the positioning rod 401 is mounted on the flipping shaft 402 and flips along the flipping shaft 402. The flipping shaft 402 is mounted on the second slide 403 and moves towards or away from the membrane positioning assembly 2 under the drive of the second drive cylinder 404. A rotating handle 405 is mounted on the end of the flipping shaft 402. In this embodiment, the positioning rod 401 can perform two actions: first, it can be manually flipped by rotating the handle 405 to facilitate the operator to insert the catheter 04; second, the second drive cylinder 404 can be pneumatically moved to push the catheter 04 into place for heat sealing with the outer membrane. In addition, the limiting plate 301 is also provided with a notch to accommodate the positioning rod 401 and avoid obstructing the positioning rod 401.

[0035] In the embodiments, such as Figure 4 As shown, the rotary handle 405 is equipped with a stop device 406 and a position sensor 407. The stop device 406 limits the rotation of the rotary handle 405, preventing excessive rotation of the positioning rod 401 and ensuring the accurate position of the guide tube 04 on the positioning rod 401. The position sensor 407 transmits signals; only when the positioning rod 401 is in the lowered position and the position sensor 407 contacts the rotary handle 405 will the fixture receive the command for the next action, thus ensuring operational safety.

[0036] In the embodiments, such as Figure 4 As shown, a support base 408 is installed on the positioning rod 401 corresponding to the liquid outlet conduit. This embodiment is suitable for the assembly and heat sealing of soft-shell filters of two types, CN104998311A and CN102861365B. In CN104998311A, the support 05 is a strip-shaped mechanism and is fixed to the conduit 04 (liquid outlet) as a whole, in which case the support base 408 is not used; while in CN102861365B, the support 05 is a tubular structure and is an independent component from the conduit 04 (liquid outlet), so the support 05 needs to be fixed to the support base 408.

[0037] In the embodiments, such as Figure 5 As shown, a limiting step 409 is provided at the front end of the positioning rod 401. The limiting step 409 limits the axial position of the guide tube 04, ensuring product consistency.

[0038] In this embodiment, the inner membrane heat-sealing lower mold 5, the outer membrane heat-sealing lower mold 6, and the positioning rod 401 all correspond to the heat-sealing parts and require high conductivity, so brass can be used. The support block 201, the first auxiliary support block 203, the second auxiliary support block 204, and the limiting plate 301 will all be in direct contact with the filter material, but heat sealing cannot occur; therefore, good insulation and heat insulation properties are required, and acetal resin (POM) can be used. The materials of other components of the fixture can be stainless steel or aluminum alloy, depending on the actual situation.

[0039] The usage steps of this embodiment are roughly as follows:

[0040] (a) Preparation of filter membrane assembly: First, place the first inner membrane 01 on the membrane positioning assembly 2. After the filter material positioning assembly 3 is in place, place the filter material 03. Then, place the second inner membrane 01 on the membrane positioning assembly 2. The inner edges of the two inner membranes 01 and the outer edge of the filter material 03 can be sealed and connected by high-frequency heat sealing.

[0041] (b) Peripheral heat sealing: After the filter media positioning assembly 3 is withdrawn into place, the heat-sealed filter media assembly is taken out. Then, the first outer membrane 02 is placed on the membrane positioning assembly 2, and the conduit 04 (liquid inlet) is placed on the conduit positioning assembly 4. Then, the filter media assembly is placed on the membrane positioning assembly 2, and then the conduit 04 (liquid outlet) and support 05 are placed on another set of conduit positioning assemblies 4. Finally, the second outer mold 02 is placed on the membrane positioning assembly 2. The edges of the filter membrane assembly and the outer membrane 02 can be sealed by high-frequency heat sealing. At the same time, the pre-filtration liquid chamber is equipped with the conduit 04 (liquid inlet), and the post-filtration liquid chamber is equipped with the conduit 04 (liquid outlet) and support 05.

[0042] Obviously, the above embodiments of the present invention are merely illustrative examples to illustrate the invention and are not intended to limit the implementation of the invention. Other obvious variations or modifications derived from the essential spirit of the invention still fall within the protection scope of the invention.

Claims

1. A heat-sealed integrated jig for assembling a soft-shell leukocyte filter, characterized in that, Includes a base plate (1), on which a membrane positioning assembly (2), a filter material positioning assembly (3), a conduit positioning assembly (4), an inner membrane heat sealing lower mold (5), and an outer membrane heat sealing lower mold (6) are provided; The membrane positioning assembly (2) positions the two inner membranes (01) and the two outer membranes (02), the filter material positioning assembly (3) positions the filter material (03), and the conduit positioning assembly (4) positions the conduit (04) and the support (05). The conduit (04) includes an inlet conduit and an outlet conduit. The inner membrane heat sealing lower mold (5) and the outer membrane heat sealing lower mold (6) are used in conjunction with a high-frequency heat sealing machine to achieve heat sealing. The filter material positioning component (3) and the conduit positioning component (4) are movable parts, and the membrane positioning component (2) can be exposed after being moved outward; The membrane positioning assembly (2) includes a support block (201) and a plurality of positioning pins (202) arranged on the support block (201). The support block (201) is made of insulating material. The inner membrane heat sealing lower mold (5) and the outer membrane heat sealing lower mold (6) are embedded in the support block (201) to form a membrane support surface. A first auxiliary support block (203) is provided in the middle of the inner membrane heat-sealing lower mold (5), and a second auxiliary support block (204) is provided in the gap between the inner membrane heat-sealing lower mold (5) and the outer membrane heat-sealing lower mold (6). Both the first auxiliary support block (203) and the second auxiliary support block (204) are made of insulating materials. The filter media positioning assembly (3) consists of two sets arranged in pairs, respectively on both sides of the membrane positioning assembly (2); the filter media positioning assembly (3) has a pair of sliding limiting plates (301), and the two opposite surfaces of the pair of limiting plates (301) form a limiting notch (302) for the filter media (03); the limiting plates (301) are mounted on the first slide (303) and move towards or away from each other under the drive of the first drive cylinder (304); The catheter positioning assembly (4) includes a reversible positioning rod (401), the positioning rod (401) is made of conductive material, the front end of which forms the insertion and mounting part of the catheter (04), the front end of the positioning rod (401) is provided with a limiting step (409), and a support seat (408) is installed on the positioning rod (401) corresponding to the liquid outlet catheter. The catheter positioning assembly (4) further includes a flip shaft (402), a second slide (403) and a second drive cylinder (404). The tail end of the positioning rod (401) is mounted on the flip shaft (402) and flips along the flip shaft (402). The flip shaft (402) is mounted on the second slide (403) and moves toward or away from the membrane positioning assembly (2) under the drive of the second drive cylinder (404). The limiting plate (301) is also provided with a notch to accommodate the positioning rod (401) and avoid blocking the positioning rod (401).

2. The assembly heat-sealed integrated fixture for the soft-shell leukocyte filter according to claim 1, characterized in that, The limiting plate (301) is made of insulating material.

3. The assembly heat-sealed integrated fixture for the soft-shell leukocyte filter according to claim 1, characterized in that, A rotating handle (405) is installed at the end of the flipping shaft (402).

4. The assembly heat-sealed integrated fixture for the soft-shell leukocyte filter according to claim 3, characterized in that, The rotary handle (405) is equipped with a stop device (406) and a position sensor (407).

5. The assembly heat-sealing integrated fixture for the soft-shell leukocyte filter according to claim 1, characterized in that, Multiple soft-shell white blood cell filters are arranged side by side at their assembly and heat-sealing positions.

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