Cattle whole blood collection equipment
By introducing a peristaltic pump and mixing components into the bovine whole blood collection device, combined with a semi-helical curved surface structure and a cylindrical mixing rod, uniform mixing of anticoagulant and blood was achieved, solving the coagulation problem caused by uneven mixing and improving collection efficiency and equipment reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 新疆生产建设兵团第八师石河子市中心血站
- Filing Date
- 2025-02-08
- Publication Date
- 2026-05-15
AI Technical Summary
Existing bovine whole blood collection equipment lacks a dedicated device for the simultaneous delivery and precise mixing of blood and anticoagulant, resulting in uneven mixing of anticoagulant and blood, which easily leads to coagulation, affecting collection efficiency and quality, and increasing the risk of sample loss.
A bovine whole blood collection device was designed, which uses a peristaltic pump and a mixing component to ensure that the anticoagulant and blood are mixed in a predetermined ratio and flow rate. The device utilizes a semi-helical curved surface mixing blade and a cylindrical mixing rod for thorough mixing, and the device is easy to maintain through a sleeve exit structure.
It improves the efficiency and quality of bovine whole blood collection, reduces the risk of coagulation, minimizes sample loss and experimental errors, extends equipment lifespan, and lowers maintenance costs.
Smart Images

Figure CN224235414U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of bovine whole blood collection technology, and more specifically, to a bovine whole blood collection device. Background Technology
[0002] Bovine whole blood collection plays a crucial role in animal husbandry, veterinary research, and biomedicine. In animal husbandry, testing bovine whole blood helps assess the health of herds, such as detecting various biochemical indicators and pathogen antibodies, enabling timely disease detection, disease control, and genetic breeding research. In veterinary clinics, bovine whole blood collection is a vital diagnostic tool; analysis of blood components accurately assesses bovine function and disease status, providing a basis for developing appropriate treatment plans. In biomedical research, certain components of bovine blood, such as clotting factors and serum proteins, have wide applications in drug development and biopharmaceutical production. Bovine whole blood collection requires specialized equipment.
[0003] However, existing bovine whole blood collection equipment has many shortcomings. It often lacks a dedicated device for simultaneous delivery and precise mixing of blood and anticoagulant, relying heavily on manual addition of anticoagulant. This makes it difficult to ensure the anticoagulant mixes with blood at a predetermined ratio and flow rate, affecting collection efficiency and quality. Furthermore, the lack of mixing components leads to uneven mixing of blood and anticoagulant, significantly increasing the risk of blood coagulation and sample loss. Subsequent experiments also face a higher risk of error due to large sample variations. Therefore, we propose a bovine whole blood collection device. Utility Model Content
[0004] The purpose of this invention is to overcome the shortcomings of the existing technology, adapt to practical needs, and provide a bovine whole blood collection device to solve the technical problems of current collection devices having difficulty controlling the ratio of anticoagulant to blood, low collection efficiency and quality, and the risk of sample loss due to easy blood coagulation.
[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a bovine whole blood collection device, comprising a shell, a blood drip chamber disposed outside the shell, an anticoagulant tube disposed outside the shell, two peristaltic pumps installed inside the shell, a pipeline pressure sensor disposed inside the shell, a mixing assembly connected to the output ends of the two peristaltic pumps, and a discharge pipe connected to the output end of the mixing assembly;
[0006] The outer shell is equipped with a blood drip chamber slot and an anticoagulant tube slot. The blood drip chamber and the anticoagulant tube are respectively inserted and connected into the blood drip chamber slot and the anticoagulant tube slot. The output end of the blood drip chamber and the output end of the anticoagulant tube are respectively detachably connected to the input end of two peristaltic pumps. The pipeline pressure sensor is connected to the pipeline connecting the blood drip chamber and the peristaltic pump. The discharge pipe extends through the outer shell.
[0007] Preferably, the mixing assembly includes a mixing sleeve, a mixing sleeve head, a mixing drive structure, a sleeve withdrawal structure, and a flow equalization tube;
[0008] The main pipe of the equalizing tube is connected to the output end of the peristaltic pump connected to the anticoagulant tube, and several branch pipes of the equalizing tube are connected to the mixing sleeve. The sleeve exit structure is installed inside the housing, and the output end of the sleeve exit structure is installed on the mixing sleeve. The mixing drive structure is slidably connected inside the housing, and the output end of the mixing drive structure is located inside the mixing sleeve. The mixing sleeve head is installed on the mixing drive structure, and the mixing sleeve head is fitted onto the mixing sleeve. The mixing sleeve head and the internal space of the mixing sleeve form a mixing channel. The mixing sleeve is connected to the output end of the peristaltic pump connected to the blood drip tube, and the discharge tube is connected to the mixing sleeve.
[0009] Preferably, the hybrid drive structure includes a first frame, a first drive motor, and a hybrid rod;
[0010] The mixing rod is located inside the mixing sleeve and is installed at the output end of the first drive motor. The first drive motor is installed inside the first frame and its output end extends through the outside of the first frame. The first frame is slidably connected inside the outer shell.
[0011] Preferably, the hybrid drive structure further includes hybrid blades and hybrid rods;
[0012] The mixing blades have a semi-helical curved surface structure. Several mixing blades form a mixing blade group, and several mixing blades in each group are arranged in a ring at equal intervals along the radial direction of the mixing rod. Several mixing blade groups are arranged at equal intervals along the axial direction of the mixing rod. The mixing rod has a cylindrical structure, and several mixing rods form a mixing rod group. Several mixing rods in each group are arranged in a ring at equal intervals along the radial direction of the mixing rod. Several mixing rod groups are arranged at equal intervals along the axial direction of the mixing rod. The mixing rod is located between two adjacent mixing blades.
[0013] Preferably, the hybrid drive structure further includes a slider, a groove, and a limiting rod;
[0014] The limiting rod is installed outside the first frame, and the other end of the limiting rod abuts against a maintenance plate. The maintenance plate is detachably connected to the rear of the outer shell. The sliding groove is located inside the outer shell, and the slider is slidably connected inside the sliding groove. The slider is installed outside the first frame.
[0015] Preferably, the sleeve withdrawal structure includes a threaded sleeve, a screw, a second drive motor, and a second frame.
[0016] The second frame is installed inside the outer shell, the second drive motor is installed inside the second frame and the output end of the second drive motor extends through the outer shell of the second frame, the screw is installed at the output end of the second drive motor, the screw sleeve is threadedly connected to the screw, and the screw sleeve is installed on the mixing sleeve.
[0017] Preferably, the sleeve withdrawal structure further includes a guide rod, which is mounted on the second frame and the other end of the guide rod is slidably connected to the threaded sleeve.
[0018] Compared with the prior art, the beneficial effects of this utility model are:
[0019] 1. This invention connects a blood drip chamber to a bovine blood collection device. A peristaltic pump then delivers the collected bovine blood through the drip chamber to one end of a mixing component. Simultaneously, an anticoagulant tube connects to an external anticoagulant delivery device. Another peristaltic pump delivers anticoagulant at a predetermined ratio and flow rate through the anticoagulant tube to the other end of the mixing component. Inside the mixing component, the blood and anticoagulant are fully mixed and blended under the impetus of the peristaltic pump. The mixing structure and flow channels allow for rapid and uniform mixing, effectively inhibiting the blood's coagulation tendency and ensuring that the collected bovine whole blood maintains good fluidity and activity during subsequent processing and storage. This invention not only improves the efficiency and quality of bovine whole blood collection but also reduces sample loss and experimental error risks caused by blood coagulation.
[0020] 2. This invention utilizes its semi-helical curved surface mixing blades to create a unique guiding and stirring effect on blood and anticoagulant during rotation, ensuring thorough mixing at different radial and axial positions. The cylindrical mixing rod, during rotation, breaks up any potential localized mixing dead zones, further enhancing the uniformity and stability of the blood-anticoagulant mixture, allowing for efficient and precise mixing in a short time. This invention ensures thorough mixing after bovine whole blood collection, quickly reaching the ideal anticoagulant state, effectively guaranteeing the quality and efficiency of bovine whole blood collection.
[0021] 3. This invention utilizes the coordinated operation of the screw sleeve, screw rod, second drive motor, and guide rod in the sleeve withdrawal structure to ensure smooth withdrawal of the mixing sleeve, creating a safe and unobstructed operating space for subsequent maintenance. The combination of the slider, groove, and limit rod in the mixing drive structure allows for flexible movement of the mixing rod, greatly facilitating cleaning and ensuring it remains in good working order. This invention effectively prevents equipment malfunctions or performance degradation caused by inadequate component cleaning, thereby significantly extending the equipment's lifespan, improving the reliability and stability of bovine whole blood collection equipment, and reducing equipment maintenance costs and downtime. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of the structure of this utility model;
[0023] Figure 2 This is a cross-sectional view of one side of the present invention;
[0024] Figure 3 This is a cross-sectional view of the other side of the present invention.
[0025] Figure 4 This is a schematic diagram of the internal structure of this utility model;
[0026] Figure 5 This is a schematic diagram of the structure of the hybrid component of this utility model;
[0027] Figure 6 This is a schematic diagram of the structure of the hybrid rod of this utility model.
[0028] Explanation of the labels in the diagram:
[0029] 1. Outer casing; 2. Blood drip chamber; 3. Anticoagulant tubing; 4. Peristaltic pump; 5. Tubing pressure sensor; 6. Mixing assembly; 7. Discharge tubing;
[0030] 101. Blood drip chamber slot; 102. Anticoagulant tubing slot; 103. Repair board;
[0031] 601. Mixing sleeve; 602. Mixing sleeve head; 603. Mixing drive structure; 604. Sleeve withdrawal structure; 605. Flow equalization tube;
[0032] 6031, First frame; 6032, First drive motor; 6033, Mixing rod; 6034, Mixing blade; 6035, Mixing rod; 6036, Slider; 6037, Slide groove; 6038, Limiting rod;
[0033] 6041, Screw sleeve; 6042, Screw; 6043, Second drive motor; 6044, Second frame; 6045, Guide rod. Detailed Implementation
[0034] Example 1, such as Figures 1 to 3 As shown, the present invention relates to a bovine whole blood collection device, comprising a housing 1, a blood dripping vessel 2 disposed outside the housing 1, an anticoagulant tube 3 disposed outside the housing 1, two peristaltic pumps 4 installed inside the housing 1, a pipeline pressure sensor 5 disposed inside the housing 1, a mixing assembly 6 connected to the output ends of the two peristaltic pumps 4, and a discharge pipe 7 connected to the output end of the mixing assembly 6.
[0035] The outer casing 1 is equipped with a blood drip chamber slot 101 and an anticoagulant tube slot 102. The blood drip chamber 2 and the anticoagulant tube 3 are respectively inserted and connected in the blood drip chamber slot 101 and the anticoagulant tube slot 102. The output end of the blood drip chamber 2 and the output end of the anticoagulant tube 3 are respectively detachably connected to the input ends of two peristaltic pumps 4. The pipeline pressure sensor 5 is connected to the pipeline connecting the blood drip chamber 2 and the peristaltic pump 4. The discharge pipe 7 extends through the outer casing 1.
[0036] Operating method: The blood is connected to the bovine blood collection device via the blood dripping pot 2. The peristaltic pump 4 delivers blood through the blood dripping pot 2 to one end of the mixing component 6. It is connected to an external anticoagulant delivery device via the anticoagulant tube 3. Another peristaltic pump 4 delivers anticoagulant through the anticoagulant tube 3 to the other end of the mixing component 6. The blood and anticoagulant mix during the delivery process, making the blood less likely to coagulate. The blood is then discharged through the discharge tube 7. During the delivery process, the blood collection status is detected by the pipeline pressure sensor 5.
[0037] This invention, when the blood drip chamber 2 is connected to a bovine blood collection device, uses a peristaltic pump 4 to deliver the collected bovine blood through the drip chamber 2 to one end of a mixing component 6. Simultaneously, an anticoagulant tube 3 is connected to an external anticoagulant delivery device, and another peristaltic pump 4 delivers anticoagulant at a predetermined ratio and flow rate through the anticoagulant tube 3 to the other end of the mixing component 6. Inside the mixing component 6, the blood and anticoagulant are fully mixed and blended under the impetus of the peristaltic pump 4. The mixing structure and flow channels allow for rapid and uniform mixing, effectively inhibiting the blood's coagulation tendency and ensuring that the collected bovine whole blood maintains good fluidity and activity during subsequent processing and storage. This invention not only improves the efficiency and quality of bovine whole blood collection but also reduces sample loss and experimental error risks caused by blood coagulation.
[0038] Specifically, such as Figures 2 to 5 As shown, the mixing component 6 of this utility model includes a mixing sleeve 601, a mixing sleeve head 602, a mixing drive structure 603, a sleeve withdrawal structure 604, and a flow equalization tube 605. The main pipe of the flow equalization tube 605 is connected to the output end of the peristaltic pump 4 connected to the anticoagulant tube 3, and the five branch pipes of the flow equalization tube 605 are all connected to the mixing sleeve 601. The sleeve withdrawal structure 604 is installed inside the outer shell 1, and the output end of the sleeve withdrawal structure 604 is installed on the mixing sleeve 601. The mixing drive structure 603 is slidably connected inside the outer shell 1, and the output end of the mixing drive structure 603 is located inside the mixing sleeve 601. The mixing sleeve head 602 is installed on the mixing drive structure 603, and the mixing sleeve head 602 is sleeved on the mixing sleeve 601. The mixing sleeve head 602 and the internal space of the mixing sleeve 601 form a mixing channel. The mixing sleeve 601 is connected to the output end of the peristaltic pump 4 connected to the blood drip tube, and the discharge tube 7 is connected to the mixing sleeve 601.
[0039] The hybrid drive structure 603 includes a first frame 6031, a first drive motor 6032, and a hybrid rod 6033. The hybrid rod 6033 is located inside the hybrid sleeve 601 and is installed at the output end of the first drive motor 6032. The first drive motor 6032 is installed inside the first frame 6031 and its output end extends through to the outside of the first frame 6031. The first frame 6031 is slidably connected inside the outer shell 1.
[0040] Working method: Blood is introduced through the mixing cannula 601, and anticoagulant is evenly introduced into various positions of the mixing cannula 601 through the flow equalization tube 605. The mixing rod 6033 is driven to rotate by the first drive motor 6032. The mixing rod 6033 rotates inside the mixing cannula 601, mixing the anticoagulant and blood, and then discharges through the discharge tube 7.
[0041] It is worth noting that, such as Figures 5 to 6 As shown, the hybrid drive structure 603 of this utility model also includes hybrid blades 6034 and hybrid rods 6035. The hybrid blades 6034 are semi-helical curved surface structures. Three hybrid blades 6034 form a hybrid blade group 6034, and the three hybrid blades 6034 in each group are arranged in a ring at equal intervals along the radial direction of the hybrid rod 6033. Ten hybrid blade groups 6034 are arranged at equal intervals along the axial direction of the hybrid rod 6033. The hybrid rods 6035 are cylindrical structures. Three hybrid rods 6035 form a hybrid rod group 6035, and the three hybrid rods 6035 in each group are arranged in a ring at equal intervals along the radial direction of the hybrid rod 6033. Twenty hybrid rod groups 6035 are arranged at equal intervals along the axial direction of the hybrid rod 6033. The hybrid rod 6033 is located between two adjacent hybrid blades 6034.
[0042] Working principle: When the mixing rod 6033 rotates, the mixing blades 6034, with their semi-helical curved surface structure, and because each group of three mixing blades 6034 are arranged in a radially equidistant ring along the mixing rod 6033, and ten groups of mixing blades 6034 are distributed equidistantly along the axial direction, the blood and anticoagulant are orderly pushed, turned, and guided by the blades when the mixing rod 6033 rotates. At the same time, the mixing straight rods 6035, consisting of three mixing straight rods 6035, are arranged in a radially equidistant ring along the mixing rod 6033, and twenty groups of mixing straight rods 6035 are distributed equidistantly along the axial direction. The mixing rod 6033 is located between two adjacent mixing blades 6034, and the cylindrical structure and specific layout of the mixing straight rods 6035 also play an auxiliary role in stirring and dispersing.
[0043] This invention utilizes its semi-helical curved surface mixing blades 6034 to create a unique guiding and stirring effect on blood and anticoagulant during rotation, ensuring thorough mixing at different radial and axial positions. The cylindrical mixing rod 6035, during rotation, breaks up any potential localized mixing dead zones, further enhancing the uniformity and stability of the blood-anticoagulant mixture, allowing for efficient and precise mixing in a short time. This invention ensures thorough mixing after bovine whole blood collection, quickly reaching the ideal anticoagulant state, effectively guaranteeing the quality and efficiency of bovine whole blood collection.
[0044] Furthermore, such as Figures 2 to 5 As shown, the hybrid drive structure 603 of this utility model also includes a slider 6036, a groove 6037, and a limiting rod 6038; the limiting rod 6038 is installed outside the first frame 6031, and the other end of the limiting rod 6038 abuts against a maintenance plate 103. The maintenance plate 103 is detachably connected to the rear of the outer shell 1. The groove 6037 is located inside the outer shell 1. The slider 6036 is slidably connected in the groove 6037, and the slider 6036 is installed outside the first frame 6031.
[0045] The sleeve withdrawal structure 604 includes a threaded sleeve 6041, a screw 6042, a second drive motor 6043, and a second frame 6044. The second frame 6044 is installed inside the outer casing 1, the second drive motor 6043 is installed inside the second frame 6044, and the output end of the second drive motor 6043 extends through to the outside of the second frame 6044. The screw 6042 is installed at the output end of the second drive motor 6043, the threaded sleeve 6041 is threadedly connected to the screw 6042, and the threaded sleeve 6041 is installed on the hybrid sleeve 601.
[0046] The sleeve withdrawal structure 604 also includes a guide rod 6045, which is mounted on the second frame 6044, and the other end of the guide rod 6045 is slidably connected to the threaded sleeve 6041.
[0047] Operating mode: When internal maintenance or repair is required, during the retraction of the mixing sleeve 601, the second drive motor 6043 starts, and its output drives the screw 6042 to rotate. Due to the threaded connection between the sleeve 6041 and the screw 6042, the sleeve 6041 moves linearly along the axial direction of the screw 6042. The sleeve 6041 is mounted on the mixing sleeve 601, thus driving the mixing sleeve 601 to retract. During this process, the guide rod 6045 plays a guiding and stabilizing role. One end is installed on the second frame 6044, and the other end is slidably connected to the screw sleeve 6041 to ensure that the movement direction of the screw sleeve 6041 under the drive of the screw 6042 is accurate and stable. After the mixing sleeve 601 is removed, it no longer obstructs the mixing rod 6033. Then, the maintenance plate 103 is removed from the rear of the outer shell 1. At this time, the limit rod 6038 loses its abutment constraint, and the position of the first frame 6031 can be adjusted by sliding the slider 6036 in the slide groove 6037, which drives the mixing rod 6033 to move. Then, the mixing rod 6033 is cleaned.
[0048] This invention utilizes the coordinated operation of the screw sleeve 6041, screw 6042, second drive motor 6043, and guide rod 6045 in the sleeve withdrawal structure 604 to smoothly withdraw the mixing sleeve 601, creating a safe and unobstructed operating space for subsequent maintenance. Meanwhile, the combination of the slider 6036, slide groove 6037, and limiting rod 6038 in the mixing drive structure 603 allows for flexible movement of the mixing rod 6033, greatly facilitating cleaning and ensuring it remains in good working order. This invention effectively prevents equipment malfunctions or performance degradation caused by inadequate component cleaning, thereby significantly extending the equipment's service life, improving the reliability and stability of bovine whole blood collection equipment, and reducing equipment maintenance costs and downtime.
[0049] The embodiments disclosed herein are preferred embodiments, but are not limited thereto. Those skilled in the art can readily grasp the spirit of this utility model based on the above embodiments and make different extensions and variations. However, as long as they do not depart from the spirit of this utility model, they are all within the protection scope of this utility model.
Claims
1. A bovine whole blood collection device, characterized in that, It includes a housing (1), a blood drip chamber (2) located outside the housing (1), an anticoagulant tube (3) located outside the housing (1), two peristaltic pumps (4) installed inside the housing (1), a pipeline pressure sensor (5) located inside the housing (1), a mixing assembly (6) connected to the output end of the two peristaltic pumps (4), and a discharge pipe (7) connected to the output end of the mixing assembly (6); The outer casing (1) is equipped with a blood drip chamber slot (101) and an anticoagulant tube slot (102). The blood drip chamber (2) and the anticoagulant tube (3) are respectively inserted and connected in the blood drip chamber slot (101) and the anticoagulant tube slot (102). The output end of the blood drip chamber (2) and the output end of the anticoagulant tube (3) are respectively detachably connected to the input end of two peristaltic pumps (4). The pipeline pressure sensor (5) is connected to the pipeline connecting the blood drip chamber (2) and the peristaltic pump (4). The discharge pipe (7) extends through the outer casing (1). The mixing component (6) includes a sleeve withdrawal structure (604), which further includes a guide rod (6045) mounted on the second frame (6044), and the other end of the guide rod (6045) is slidably connected to a threaded sleeve (6041).
2. The bovine whole blood collection device according to claim 1, characterized in that, The mixing component (6) further includes a mixing sleeve (601), a mixing sleeve head (602), a mixing drive structure (603), and a flow equalization tube (605); The main pipe of the equalizing pipe (605) is connected to the output end of the peristaltic pump (4) connected to the anticoagulant pipe (3), and several branch pipes of the equalizing pipe (605) are connected to the mixing sleeve (601). The sleeve exit structure (604) is installed inside the outer shell (1), and the output end of the sleeve exit structure (604) is installed on the mixing sleeve (601). The mixing drive structure (603) is slidably connected inside the outer shell (1). The output end is located inside the mixing sleeve (601). The mixing sleeve head (602) is installed on the mixing drive structure (603). The mixing sleeve head (602) is sleeved on the mixing sleeve (601), and the mixing sleeve head (602) and the internal space of the mixing sleeve (601) form a mixing channel. The mixing sleeve (601) is connected to the output end of the peristaltic pump (4) connected to the blood dropper, and the discharge pipe (7) is connected to the mixing sleeve (601).
3. The bovine whole blood collection device according to claim 2, characterized in that, The hybrid drive structure (603) includes a first frame (6031), a first drive motor (6032), and a hybrid rod (6033); The mixing rod (6033) is located inside the mixing sleeve (601) and is installed at the output end of the first drive motor (6032). The first drive motor (6032) is installed inside the first frame (6031) and the output end of the first drive motor (6032) extends through to the outside of the first frame (6031). The first frame (6031) is slidably connected inside the outer shell (1).
4. The bovine whole blood collection device according to claim 3, characterized in that, The hybrid drive structure (603) also includes a hybrid blade (6034) and a hybrid rod (6035); The hybrid blade (6034) has a semi-helical curved surface structure. Several hybrid blades (6034) form a hybrid blade (6034) group, and several hybrid blades (6034) in each group are arranged in a ring at equal intervals along the radial direction of the hybrid rod (6033). Several hybrid blade (6034) groups are arranged at equal intervals along the axial direction of the hybrid rod (6033). The hybrid rod (6035) has a cylindrical structure. Several hybrid rods (6035) form a hybrid rod (6035) group, and several hybrid rods (6035) in each group are arranged in a ring at equal intervals along the radial direction of the hybrid rod (6033). Several hybrid rod (6035) groups are arranged at equal intervals along the axial direction of the hybrid rod (6033). The hybrid rod (6033) is located between two adjacent hybrid blades (6034).
5. A bovine whole blood collection device according to claim 3, characterized in that, The hybrid drive structure (603) also includes a slider (6036), a groove (6037), and a limiting rod (6038); The limiting rod (6038) is installed outside the first frame (6031), and the other end of the limiting rod (6038) abuts against the maintenance plate (103). The maintenance plate (103) is detachably connected to the rear of the outer shell (1). The slide groove (6037) is provided inside the outer shell (1). The slider (6036) is slidably connected in the slide groove (6037), and the slider (6036) is installed outside the first frame (6031).
6. A bovine whole blood collection device according to claim 2, characterized in that, The sleeve withdrawal structure (604) includes a threaded sleeve (6041), a screw (6042), a second drive motor (6043), and a second frame (6044); The second frame (6044) is installed inside the outer casing (1), the second drive motor (6043) is installed inside the second frame (6044), and the output end of the second drive motor (6043) extends through to the outside of the second frame (6044). The screw (6042) is installed at the output end of the second drive motor (6043), the screw sleeve (6041) is threaded onto the screw (6042), and the screw sleeve (6041) is installed on the mixing sleeve (601).