Pump head fixing mechanism and blood supply system

Abstract

The utility model relates to the technical field of medical instruments, in particular to a pump head fixing mechanism and a blood supply system. The pump head fixing mechanism comprises a clamping seat and a pump head, the clamping seat is provided with a first clamping part and a locking piece, the first clamping part and the locking piece are arranged in the circumferential direction of the clamping seat, the pump head is provided with a second clamping part, the second clamping part can rotate in the first clamping part, and a pressing state and a locking state exist between the second clamping part and the locking piece. A mounting position and a locking position are arranged between the pump head and the clamping seat, and when the pump head and the clamping seat are located at the mounting position, the locking piece is configured to be driven by the second clamping part and can move in the direction away from the second clamping part; and when the pump head and the clamping seat are located at the locking position, the locking piece is configured to be released from the second clamping part and can move in the direction close to the second clamping part. The blood supply system comprises the pump head fixing mechanism. The pump head fixing mechanism and the blood supply system are convenient to disassemble and assemble.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, and particularly relates to a pump head fixing mechanism and a blood supply system. Background Art

[0002] In the fields of non - ischemic organ transplantation technology and donor mechanical perfusion technology, the donor needs to externally supply blood into the donor circulation. Usually, a centrifugal pump is used to provide power for the external blood. As a part of the consumables, the pump head needs to be disassembled and replaced continuously. Therefore, it is very necessary for the pump head to be freely installed and disassembled.

[0003] At present, most medical devices fix the pump head by using movable pins, which makes the operation process of disassembling and assembling the pump head troublesome and not convenient for freely installing and disassembling the pump head. Summary of the Utility Model

[0004] The main purpose of the utility model is to propose a pump head fixing mechanism and a blood supply system, aiming to solve the technical problem that the current operation process of disassembling and assembling the pump head is troublesome and not convenient for freely installing and disassembling the pump head.

[0005] To achieve the above purpose, the utility model proposes a pump head fixing mechanism, including:

[0006] A clamping seat, the clamping seat has a first clamping part and a locking part, and the first clamping part and the locking part are arranged along the circumferential direction of the clamping seat;

[0007] A pump head, the pump head has a second clamping part, the second clamping part can rotate within the first clamping part, and there are a pressing state and a locking state between the second clamping part and the locking part;

[0008] Wherein, there are an installation position and a locking position between the pump head and the clamping seat. When the pump head and the clamping seat are in the installation position, the locking part is configured to be driven by the second clamping part and can move in a direction away from the second clamping part, so that the second clamping part and the locking part are in the pressing state; when the pump head and the clamping seat are in the locking position, the locking part is configured to be released from the second clamping part and can move in a direction close to the second clamping part, so that the second clamping part and the locking part are in the locking state.

[0009] In some embodiments, the first clamping part is a clamping groove, the second clamping part is a clamping protrusion, and a clamping gap is provided on the clamping protrusion;

[0010] Wherein, the clamping protrusion can drive the locking member to move in a direction away from the clamping protrusion, so that the clamping protrusion and the locking member are in the pressing state; the clamping protrusion can rotate in the clamping groove, and enable the locking member to be clamped in the clamping gap, so that the clamping protrusion and the locking member are in the locking state.

[0011] In some embodiments, the pump head fixing mechanism includes a motor. When the pump head and the card seat are in the locked position, the pump head can be connected to the motor.

[0012] In some embodiments, the card seat is provided with a mounting groove, and the locking member is arranged in the mounting groove;

[0013] Wherein, a spring is arranged in the mounting groove, and the locking member is connected to the mounting groove through the spring.

[0014] In some embodiments, a positioning pin is arranged between the mounting groove and the locking member.

[0015] In some embodiments, the inner wall of the mounting groove is provided with a sliding groove. Relative to the sliding groove, a sliding block extends outward from the side wall of the locking member, and the sliding block and the sliding groove are cooperatively connected to guide the movement of the locking member.

[0016] In some embodiments, a guiding surface is arranged on one side of the locking member close to the pump head. Along the direction parallel to the movement of the locking member, the guiding surface gradually approaches the pump head.

[0017] In some embodiments, the surface of the locking member is provided with friction patterns, or the surface of the locking member is provided with friction protrusions.

[0018] In some embodiments, when the pump head is in the locked position, the included angle α between the radial center line of the pump head and the center line of the locking member satisfies: 75° ≤ α ≤ 90°.

[0019] Correspondingly, the present utility model further provides a blood supply system, including the pump head fixing mechanism in any of the above embodiments.

[0020] Compared with the prior art, the beneficial effects of the present utility model are:

[0021] In the technical solution of the present utility model, when the pump head is installed on the card seat, first, the pump head will be in the installation position of the card seat. At this time, the pump head and the card seat are relatively movable. Then, the pump head is rotated in the direction of the locking position. During the rotation of the pump head, the second engaging portion will contact the locking member and continuously extrude the locking member outward. After being driven by the second engaging portion, the locking member will move in the direction away from the second engaging portion, making the gap between the locking member and the second engaging portion larger and larger. As a result, the second engaging portion can gradually move downward during the rotation and finally be able to cooperate and connect with the first engaging portion, enabling the second engaging portion to rotate within the first engaging portion. When the pump head rotates to the locking position, at this time, the second engaging portion and the locking member are no longer in contact (exemplarily, for example, a recess can be provided on the second engaging portion so that the locking member can be stuck in the recess to ensure that the locking member and the second engaging portion are no longer in contact), causing the locking member to be released and able to move in the direction close to the second engaging portion to lock the second engaging portion within the first engaging portion, ensuring that the pump head and the card seat are no longer relatively movable. Thus, the installation and fixation operation of the pump head has been completed. At this time, the operator can use the pump head for blood supply operation to achieve the treatment of the donor. When the pump head is disassembled from the card seat, first, the locking member is pushed in the direction away from the second engaging portion to create a gap between the locking member and the second engaging portion, and the pump head is rotated from the locking position in the direction close to the installation position. During the rotation of the pump head, the second engaging portion will gradually disengage from within the first engaging portion, thereby achieving the disassembly of the pump head from the card seat.

[0022] In the pump head fixing mechanism provided by the present utility model, the operation methods for installing and disassembling the pump head on the card seat are simple. Only by rotating the pump head, the pump head can be automatically installed on the card seat. At the same time, only by pushing the locking member, the pump head can be disassembled from the card seat. Compared with the fixing method of using a movable pin for the pump head, in the pump head fixing mechanism provided by the present utility model, the operator can even complete the installation and disassembly operations of the pump head with only one hand, which is beneficial to improving the disassembly and assembly efficiency of the pump head, saving the disassembly and assembly time of the pump head, and simplifying the disassembly and assembly steps of the pump head.

[0023] The blood supply system applying the above pump head fixing mechanism can effectively reduce the disassembly and assembly difficulty of the pump head on the mechanism. The pump head can be installed into the mechanism with one hand, ensuring that the pump head can be installed and put into use in time, thereby reducing the degree of ischemic impact on the donor. Brief Description of the Drawings

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0025] Figure 1 Schematic diagram of the overall structure of the pump head fixing mechanism provided by an embodiment of the present invention when the pump head is in the installation position;

[0026] Figure 2 Schematic diagram of the overall structure of the pump head fixing mechanism provided by an embodiment of the present invention when the pump head is in the locked position;

[0027] Figure 3 Exploded view of the overall structure of the pump head fixing mechanism provided by an embodiment of the present invention;

[0028] Figure 4 For Figure 3 Partial enlarged view at A in

[0029] Figure 5 Top view of the overall structure of the pump head fixing mechanism provided by an embodiment of the present invention.

[0030] Explanation of the reference numerals in the drawings:

[0031] 100 - Clamping seat;

[0032] 110 - First clamping part; 120 - Locking part; 130 - Installation position; 140 - Locked position; 150 - Installation groove;

[0033] 111 - Clamping groove;

[0034] 121 - Slide block; 122 - Guide surface;

[0035] 151 - Spring; 152 - Positioning pin; 153 - Slide groove;

[0036] 200 - Pump head;

[0037] 210 - Second clamping part;

[0038] 211 - Clamping protrusion; 212 - Clamping gap.

[0039] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the drawings. Detailed implementation manners

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the scope protected by the present utility model.

[0041] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0042] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or", "and / or", or "and / or" appear throughout the text, their meanings include three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or the solution where A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0043] In the field of non - ischemic organ transplantation technology and donor machine perfusion technology, the donor needs to externally provide blood to enter the donor circulation. Usually, a centrifugal pump is used to provide power for the external blood. As part of the consumables, the pump head needs to be continuously disassembled and replaced. Therefore, it is very necessary for the pump head to be freely disassembled and assembled.

[0044] Currently, most medical devices use the method of movable pins to fix the pump head, making the operation process of disassembling and assembling the pump head troublesome and not facilitating the free disassembly and assembly of the pump head.

[0045] To solve the technical problem that the current operation process of disassembling and assembling the pump head 200 is troublesome and not facilitating the free disassembly and assembly of the pump head 200, refer to Figures 1 to 5, an embodiment of the present utility model provides a fixing mechanism for a pump head 200, which includes a clamping seat 100 and a pump head 200. The clamping seat 100 has a first clamping portion 110 and a locking member 120. The first clamping portion 110 and the locking member 120 are arranged along the circumferential direction of the clamping seat 100. The pump head 200 has a second clamping portion 210. The second clamping portion 210 can rotate within the first clamping portion 110. There are a pressing state and a locking state between the second clamping portion 210 and the locking member 120. Among them, there are an installation position 130 and a locking position 140 between the pump head 200 and the clamping seat 100. When the pump head 200 and the clamping seat 100 are in the installation position 130, the locking member 120 is configured to be driven by the second clamping portion 210 and can move in a direction away from the second clamping portion 210, so that the second clamping portion 210 and the locking member 120 are in the pressing state; when the pump head 200 and the clamping seat 100 are in the locking position 140, the locking member 120 is configured to be released from the second clamping portion 210 and can move in a direction close to the second clamping portion 210, so that the second clamping portion 210 and the locking member 120 are in the locking state.

[0046] Specifically, to solve the above problems, in this embodiment, when the pump head 200 is installed on the card seat 100, first, the pump head 200 is located at the installation position 130 of the card seat 100. At this time, the pump head 200 and the card seat 100 are relatively movable. Then, the pump head 200 is rotated in the direction of the locking position 140. During the rotation of the pump head 200, the second engaging portion 210 contacts the locking member 120 and continuously extrudes the locking member 120 outward. After being driven by the second engaging portion 210, the locking member 120 moves in a direction away from the second engaging portion 210, increasing the gap between the locking member 120 and the second engaging portion 210. As a result, the second engaging portion 210 can gradually move downward during rotation and finally cooperate with the first engaging portion 110 to be connected, enabling the second engaging portion 210 to rotate within the first engaging portion 110. When the pump head 200 rotates to the locking position 140, the second engaging portion 210 and the locking member 120 are no longer in contact (exemplarily, for example, a recess can be provided on the second engaging portion 210 so that the locking member 120 can be stuck in the recess to ensure that the locking member 120 and the second engaging portion 210 are no longer in contact). This releases the locking member 120, which can then move in a direction closer to the second engaging portion 210 to lock the second engaging portion 210 within the first engaging portion 110, ensuring that the pump head 200 and the card seat 100 are no longer relatively movable. At this point, the installation and fixation operation of the pump head 200 has been completed. At this time, the operator can use the pump head 200 to perform the blood supply operation to treat the donor. When the pump head 200 is disassembled from the card seat 100, first, the locking member 120 is pushed in a direction away from the second engaging portion 210 to create a gap between the locking member 120 and the second engaging portion 210. Then, the pump head 200 is rotated from the locking position 140 in the direction closer to the installation position 130. During the rotation of the pump head 200, the second engaging portion 210 gradually disengages from the first engaging portion 110, thus achieving the disassembly of the pump head 200 from the card seat 100.

[0047] In the pump head 200 fixing mechanism provided in this embodiment, the operation methods for installing and disassembling the pump head 200 on the card seat 100 are simple. Only by rotating the pump head 200, the pump head 200 can be automatically installed on the card seat 100. At the same time, only by pushing the locking member 120, the pump head 200 can be disassembled from the card seat 100. Compared with the fixing method of using movable pins for the pump head 200, in the pump head 200 fixing mechanism provided in this embodiment, the operator can even complete the installation and disassembly operations of the pump head 200 with only one hand, which is beneficial to improving the disassembly and assembly efficiency of the pump head 200, saving the disassembly and assembly time of the pump head 200, and simplifying the disassembly and assembly steps of the pump head 200.

[0048] In some embodiments, referring to Figure 3, the first clamping portion 110 is a clamping groove 111, the second clamping portion 210 is a clamping protrusion 211, and the clamping protrusion 211 is provided with a clamping gap 212. Wherein, the clamping protrusion 211 can drive the locking member 120 to move in a direction away from the clamping protrusion 211, so that the clamping protrusion 211 and the locking member 120 are in a pressed state; the clamping protrusion 211 can rotate in the clamping groove 111, and the locking member 120 can be clamped in the clamping gap 212, so that the clamping protrusion 211 and the locking member 120 are in a locked state.

[0049] Specifically, in this embodiment, a specific structural form of the first clamping portion 110 and the second clamping portion 210 is provided. When the pump head 200 is installed on the card seat 100, first, the clamping protrusion 211 will contact the locking member 120. As the pump head 200 continuously rotates from the installation position 130 to the locking position 140, the clamping protrusion 211 will gradually push the locking member 120 outward in a direction away from the clamping protrusion 211, so that the gap between the clamping protrusion 211 and the locking member 120 increases, which is conducive to the clamping protrusion 211 being located in the clamping groove 111. When the pump head 200 rotates to the locking position 140, the locking member 120 can just be aligned with the clamping gap 212. Since the thrust of the clamping protrusion 211 on the locking member 120 disappears at this time, the locking member 120 is in a released state and can move in a direction close to the clamping protrusion 211. Finally, the locking member 120 can be clamped in the clamping gap 212 to realize the clamping positioning of the pump head 200. When the pump head 200 is disassembled from the card seat 100, first, the locking member 120 is pushed in a direction away from the clamping protrusion 211, so that there is a large gap between the locking member 120 and the clamping protrusion 211. Then, the pump head 200 is rotated from the locking position 140 to the installation position 130, so that the clamping protrusion 211 disengages from the clamping groove 111, thereby realizing the disassembly of the pump head 200 from the card seat 100.

[0050] In some embodiments, the pump head 200 fixing mechanism includes a motor (not shown in the figure). When the pump head 200 and the card seat 100 are in the locking position 140, the pump head 200 can be connected to the motor.

[0051] Specifically, in this embodiment, by way of example, for example, the pump head 200 may include an axis and an impeller inside. The impeller can be arranged on the axis and can drive the impeller to rotate by using the axis. When the pump head 200 is connected to the motor, specifically when the axis of the pump head 200 is connected to the drive shaft of the motor, the motor is started. The drive shaft of the motor will rotate and drive the axis of the pump head 200 to rotate. At this time, the impeller arranged on the axis of the pump head 200 will also be driven to rotate. When the impeller rotates at a high speed, the blades of the impeller can guide the blood and throw the blood to the outer edge. The dynamic effect of the blades on the blood will form arterial pressure, thereby realizing the effect of pumping blood.

[0052] It should be noted that the specific connection manner between the pump head 200 and the motor can refer to the conventional technologies in this field, and will not be elaborated here.

[0053] In some embodiments, referring to Figures 3 to 4 , the card seat 100 is provided with an installation groove 150, and the locking member 120 is arranged in the installation groove 150. Among them, a spring 151 is arranged in the installation groove 150, and the locking member 120 is connected to the installation groove 150 through the spring 151.

[0054] Specifically, in this embodiment, a specific structure is provided that can enable the locking member 120 to move in the direction close to the second engaging portion 210 or in the direction away from the second engaging portion 210. When the locking member 120 moves in the direction away from the second engaging portion 210 under pressure, the spring 151 will be compressed. On the one hand, after the spring 151 is compressed, it can increase the gap between the locking member 120 and the second engaging portion 210, ensuring that the second engaging portion 210 can be smoothly aligned with the first engaging portion 110, so as to realize the installation of the pump head 200 on the card seat 100. On the other hand, the spring 151 can play a limiting role on the locking member 120, preventing the pressing force between the locking member 120 and the second engaging portion 210 from being too large and causing the locking member 120 to disengage from the card seat 100. When the pressure applied to the locking member 120 disappears, the spring 151 has a tendency to recover its elastic deformation, so that the spring 151 will drive the locking member 120 to automatically reset, which is beneficial to realizing the automatic clamping of the locking member 120 on the pump head 200 and ensuring that the pump head 200 can be stably fixed on the card seat 100.

[0055] Furthermore, in order to ensure the force balance of the locking member 120 during the movement process, two springs 151 can be symmetrically arranged in the installation groove 150, and the locking member 120 is connected to the installation groove 150 through the above two springs 151. Compared with the structural form in which the locking member 120 is connected to the installation groove 150 through one spring 151, adopting the above structural form is beneficial to improving the force balance of the locking member 120 during the movement process and preventing the locking member 120 from tipping and deviating due to uneven force.

[0056] In some embodiments, referring to Figures 3 to 4 , a positioning pin 152 is arranged between the installation groove 150 and the locking member 120. The positioning pin 152 can limit the original position state of the locking member 120 and prevent the locking member 120 from falling off the card seat 100.

[0057] In some embodiments, referring to Figures 3 to 4, a sliding groove 153 is provided on the groove wall of the installation groove 150. Relative to the sliding groove 153, a sliding block 121 is provided on the side wall of the locking member 120 extending outward. The sliding block 121 and the sliding groove 153 are connected in a matching manner to guide the movement of the locking member 120.

[0058] Specifically, in order to further ensure the stability of the locking member 120 during movement, in this embodiment, when the locking member 120 moves in a direction away from the second engaging portion 210 or in a direction close to the second engaging portion 210, the sliding block 121 will also move synchronously in the sliding groove 153. Through the cooperation between the sliding block 121 and the sliding groove 153, it can play an auxiliary guiding role in the movement of the locking member 120, not only making the movement of the locking member 120 smoother and easier, but also being beneficial to limit the direction perpendicular to the movement direction of the locking member 120, thereby effectively restricting the freedom degree of the locking member 120 during movement and improving the stability of the locking member 120 during movement.

[0059] In some embodiments, referring to Figures 1 to 3 , a guiding surface 122 is provided on the side of the locking member 120 close to the pump head 200. Along the direction parallel to the movement of the locking member 120, the guiding surface 122 gradually approaches the pump head 200.

[0060] Specifically, in order to more conveniently install the pump head 200 on the card seat 100, in this embodiment, a guiding surface 122 is provided on the contact surface between the locking member 120 and the pump head 200. The guiding surface 122 can be an inclined surface that gradually inclines towards the direction close to the pump head 200, enabling the pump head 200 to adaptively find the screw-in port, facilitating the screwing of the pump head 200 into the card seat 100, and preventing the situation where the pump head 200 is stuck by the edge of the locking member 120 and cannot move downward continuously.

[0061] In some embodiments, referring to Figures 1 to 3 , friction patterns are provided on the surface of the locking member 120, or friction protrusions are provided on the surface of the locking member 120.

[0062] Specifically, in this embodiment, by providing friction patterns or friction protrusions on the surface of the locking member 120, it is beneficial to prevent the operator from slipping when pushing the locking member 120, thereby facilitating the operator to operate the locking member 120.

[0063] Furthermore, in some embodiments, the locking member 120 can be made of a self-lubricating material (exemplarily, for example, the locking member 120 can be made of high polymers such as polytetrafluoroethylene and polyethylene). Using such a material is beneficial to improving the sliding feel of the locking member 120 and extending the service life of the locking member 120.

[0064] In some embodiments, referring to Figure 5, when the pump head 200 is in the locked position 140, the included angle α between the radial center line of the pump head 200 and the center line of the locking member 120 satisfies: 75° ≤ α ≤ 90°. Exemplarily, for example, the value of α can be 75°, 80°, 85°, 90°, and so on.

[0065] Specifically, in order to prevent the pump head 200 from being screwed out when it is stuck and subjected to an outward rotational force, in this embodiment, when the pump head 200 is in the locked position 140, the relative positions of the locking member 120 and the pump head 200 are designed such that when the pump head 200 is subjected to an outward rotational force, the force exerted by the pump head 200 on the locking member 120 is perpendicular to the side wall of the locking member 120, and the side wall of the locking member 120 is parallel to the movement direction of the locking member 120, and the component force of the acting force in the movement direction of the locking member 120 is zero. Therefore, the locking member 120 will not move and release the pump head 200 due to an external force on the pump head 200, effectively ensuring the fixing stability of the pump head 200 on the card seat 100.

[0066] Correspondingly, another embodiment of the present invention further provides a blood supply system, which includes the pump head 200 fixing mechanism in any of the above embodiments.

[0067] Specifically, in this embodiment, the blood supply system applying the above pump head 200 fixing mechanism can effectively reduce the disassembly and assembly difficulty of the pump head 200 on the mechanism, and the pump head 200 can be installed into the mechanism with one hand, ensuring that the pump head 200 can be installed and put into use in time, thereby reducing the degree of ischemic strike on the donor.

[0068] Benefiting from the improvement of the above pump head 200 fixing mechanism, the blood supply system of this embodiment has the same technical effects as the above pump head 200 fixing mechanism, which will not be elaborated here.

[0069] It should be noted that other contents of the pump head 200 fixing mechanism and the blood supply system disclosed in the present invention can be referred to the prior art, which will not be elaborated here.

[0070] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. All equivalent structural transformations made under the inventive concept of the present invention by using the specification and drawings of the present invention, or directly / indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims

1. Pump head fixing mechanism, characterized in that: include: A card base, wherein the card base has a first card connection portion and a locking piece, wherein the first card connection portion and the locking piece are arranged along the circumference of the card base; A pump head, wherein the pump head has a second clamping portion, the second clamping portion can rotate within the first clamping portion, and the second clamping portion and the locking member are in a compressed state and a locked state; In which, an installation position and a locking position are provided between the pump head and the socket. When the pump head and the socket are in the installation position, the locking piece is configured to be driven by the second clamping portion and to be able to move in a direction away from the second clamping portion, so that the second clamping portion and the locking piece are in the compressed state; when the pump head and the socket are in the locking position, the locking piece is configured to be released from the second clamping portion and to be able to move in a direction close to the second clamping portion, so that the second clamping portion and the locking piece are in the locked state.

2. The pump head fixing mechanism according to claim 1, characterized in that: The first clamping portion is a clamping groove, the second clamping portion is a clamping protrusion, and the clamping protrusion is provided with a clamping gap; Among them, the locking protrusion can drive the locking piece to move in the direction away from the locking protrusion, so that the locking protrusion and the locking piece are in the clamping state; the locking protrusion can rotate in the locking groove and enable the locking piece to be engaged in the locking gap, so that the locking protrusion and the locking piece are in the locked state.

3. The pump head fixing mechanism according to claim 1, characterized in that: The pump head fixing mechanism comprises a motor, and when the pump head and the holder are in the locking position, the pump head can be connected to the motor.

4. The pump head fixing mechanism according to claim 1, characterized in that: The card holder is provided with a mounting groove, and the locking member is arranged in the mounting groove; Wherein, a spring is arranged in the installation groove, and the locking member is connected to the installation groove through the spring.

5. The pump head fixing mechanism according to claim 4, characterized in that: A positioning pin is arranged between the mounting groove and the locking member.

6. The pump head fixing mechanism according to claim 4, characterized in that: The groove wall of the installation groove is provided with a slide groove, and relative to the slide groove, the side wall of the locking member is provided with a slider extending outward, and the slider and the slide groove are matched and connected to guide the movement of the locking member.

7. The pump head fixing mechanism according to claim 1, characterized in that: A guide surface is arranged on one side of the locking member close to the pump head, and the guide surface gradually approaches the pump head along a direction parallel to the movement of the locking member.

8. The pump head fixing mechanism according to claim 1, characterized in that: The surface of the locking piece is provided with a friction pattern, or the surface of the locking piece is provided with a friction protrusion.

9. The pump head fixing mechanism according to claim 1, characterized in that: When the pump head is in the locking position, an angle α between a center line of the pump head in a radial direction and a center line of the locking member satisfies: 75°≤α≤90°.

10. A blood supply system, characterized in that It comprises the pump head fixing mechanism as described in any one of claims 1 to 9.

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