Centrifugal pump

Abstract

The centrifugal pump comprises a pump head and a pump body which are detachably connected into a whole, the pump head is provided with a blood inlet pipe and a blood outlet pipe, the blood outlet pipe is tangent to the outer side of the pump head and extends forwards, the pump body comprises a shell and a driver arranged in the shell, and the driver is arranged in the shell. A connecting protruding part protruding out of the surface of the shell is formed on the side face of the shell, the surface of the connecting protruding part is perpendicular to the blood outlet pipe, a connecting inserting block extending in an inclined mode is fixedly arranged on the connecting protruding part, a concave clamping groove is formed in one side edge of the connecting inserting block, and an included angle is formed between the axis of the connecting inserting block and the axis of the pump body. When the connecting insertion block is in a vertical state, the pump body and the pump head are inclined, and a tube opening of the blood outlet tube is located at the top of an inner cavity of the pump head. The connecting insertion block inclined relative to the pump head is arranged, so that the orifice of a blood vessel is located at the top of the inner cavity of the pump head, the exhaust efficiency is improved, heat is reduced, continuous flowing of internal blood is guaranteed, and thrombus is reduced.

Description

[0001] This application is a divisional application with application number "202320831575.2", application date "April 14, 2023", and invention name "Centrifugal pump, connecting bracket and extracorporeal membrane oxygenation device". Technical Field

[0002] The utility model relates to the technical field of medical equipment, and in particular to a centrifugal pump, a connecting bracket and an extracorporeal membrane oxygenation device. Background Art

[0003] ECMO is the abbreviation of extracorporeal membrane oxygenation, which mainly includes intraductal cannula, power pump, oxygenator and detection system. It draws venous blood out of the body, oxygenates it through artificial heart-lung bypass, and then injects it into the patient's arterial or venous system, thus playing a partial heart-lung replacement role and maintaining oxygenated blood supply to human organs and tissues.

[0004] The power pump generally adopts a centrifugal pump, which mainly plays the role of an artificial heart. As disclosed in Announcement No. CN 215023514 U and Publication No. CN 111701102 A, the application scenarios of ECMO are not limited to the operating room and need to be used mobile. However, the setting of the existing power pump causes many inconveniences to the mobile use of ECMO. First, traditional power pumps are generally fixed to the bracket or bedside with screws, which is very inconvenient to disassemble and move; second, the power pump itself has weight, and the bumps during transportation can easily cause damage to the power pump or cause the fixation of the power pump to loosen, thereby affecting the stability of use; third, conventional power pumps are fixed vertically or horizontally, which is not conducive to the discharge of gas inside the power pump and the blood flow at the bottom of the power pump. It is easy to form a blood clot at the bottom of the power pump, resulting in the entire extracorporeal blood oxygenation process being obstructed and the safety is not high; finally, the pump head of the power pump is a disposable consumable that needs to be replaced. The conventional screw fixing method makes replacement cumbersome, and if screws are not used for fastening, it is easy to loosen and fall off during mobile transportation, causing greater inconvenience. Utility Model Content

[0005] The utility model aims to overcome the deficiencies in the prior art and provides a centrifugal pump, a connecting bracket and an extracorporeal membrane oxygenation device.

[0006] The purpose of the utility model is achieved through the following technical solutions:

[0007] A centrifugal pump comprises a pump head and a pump body which are detachably connected as one body, the pump head having an inlet blood vessel and an outlet blood vessel, the outlet blood vessel being tangent to the outer side of the pump head and extending forward, the pump body comprising a shell and a driver built into the shell, a connecting convex portion protruding outwardly from the surface of the shell is formed on the side surface of the shell, the surface of the connecting convex portion is perpendicular to the outlet blood vessel, an inclined extending connecting plug block is fixedly provided on the connecting convex portion, a concave card groove is formed on one side edge of the connecting plug block, an angle is formed between the axis of the connecting plug block and the axis of the pump body, so that when the connecting plug block is in a vertical state, the pump body and the pump head are inclined and the pipe mouth of the outlet blood vessel is located at the top of the inner cavity of the pump head.

[0008] Preferably, both sides of the bottom of the connecting plug block have inwardly inclined guiding slopes.

[0009] Preferably, a pump head seat is provided on the top of the shell, a truncated cone is provided on the axis of the pump head seat, a group of clamping blocks are evenly distributed on the outer peripheral wall of the truncated cone, the bottom of the pump head has a skirt matching the truncated cone, the skirt is provided with an L-shaped bayonet matching the clamping block, the clamping block is clamped at the first end of the bayonet to limit the axial movement of the pump head; the pump head seat is also provided with an elastic block that moves axially relative to the pump head seat, the elastic block has a clamping arm extending toward the truncated cone, and when the clamping block is clamped with the bayonet, the clamping arm is clamped into the second end of the bayonet to limit the circumferential movement of the pump head.

[0010] Preferably, a groove is provided on the side of the pump head seat, the elastic block is slidably embedded in the groove, a positioning column and a spring are provided between the inside of the elastic block and the groove, the positioning column is fixed on the bottom surface of the groove, the spring is sleeved on the positioning column and its two ends are respectively abutted against the bottom surfaces of the elastic block and the groove.

[0011] Preferably, the inner side wall of the elastic block has an arc that matches the outer peripheral wall of the cone, and a portion of the inner side wall of the elastic block is concave to form an abutment surface that matches the skirt, and the other portion forms a clamping arm that matches the second end of the bayonet.

[0012] A connecting bracket, used to fix the centrifugal pump as described above, comprises a supporting frame and a connecting seat, the connecting seat comprises a slot and a locking block, the slot matches the connecting block and is vertically arranged on the supporting frame, notches matching the card slot are formed on both sides of the slot, the locking block is horizontally slidably arranged on the back side of the slot, the two ends of the locking block are respectively a locking end and a release end, the locking end and the release end both match the notch, the inner side wall of the locking end has a wedge block, a reset spring is arranged between the release end and the connecting seat, and the locking block locks or releases the connecting block by sliding relative to the connecting seat.

[0013] Preferably, an elastic column that can be extended and retracted up and down relative to the slot is provided at the bottom of the slot, and a second spring is sleeved on the elastic column to always apply an upward thrust to the elastic column. When the connecting block is inserted into the slot, the top of the elastic column abuts against the bottom of the connecting block.

[0014] Preferably, a group of horizontally extending waist-shaped holes are provided on the locking block, and a connecting pin is provided in the connecting seat. The connecting pin is inserted into the waist-shaped holes, so that the locking block can move horizontally relative to the connecting seat.

[0015] Preferably, it further comprises a connecting support plate, wherein the connecting support plate is vertically fixed on the supporting frame, and the connecting seat is vertically fixed on the connecting support plate.

[0016] An extracorporeal membrane oxygenation device comprises at least the centrifugal pump as described above and the connecting bracket as described above, wherein the centrifugal pump is inserted into the connecting seat via a connecting plug, and the connecting plug is inserted into the connecting seat so that the centrifugal pump is arranged obliquely relative to the connecting bracket, so that the outlet of the blood vessel is located at the top of the inner cavity of the centrifugal pump.

[0017] The beneficial effects of the utility model are mainly reflected in:

[0018] 1. The connecting plug is tilted relative to the pump head, so that after the connecting plug is inserted into the connecting seat and is in a vertical state, the pump body is tilted to make the outlet of the blood vessel located at the top of the inner cavity of the pump head, thereby maximizing the discharge efficiency of the gas in the blood and reducing the generation of heat. At the same time, the tilted setting of the centrifugal pump can ensure the continuous flow of blood inside it, reduce the generation of thrombus inside the pump head, and effectively avoid the destruction of blood cells;

[0019] 2. A connecting plug is provided on the pump body of the centrifugal pump, and a connecting seat is provided on the connecting bracket to facilitate the quick installation and removal of the centrifugal pump. A locking block is used on the connecting seat to automatically lock the connecting plug, replacing the traditional screw fixing to ensure the position stability of the centrifugal pump after installation. The connecting plug greatly increases the connection area of ​​the centrifugal pump, effectively enhancing its connection stability so that it will not loosen due to movement;

[0020] 3. The pump head and the pump body are quickly connected using a card block and a bayonet. The first end of the card block is engaged with the bayonet to limit the axial movement of the pump head, and the elastic block is engaged with the second end of the bayonet to limit the axial movement of the pump head. On the one hand, it is convenient for the quick replacement of the pump head, and on the other hand, it can enhance the connection stability and effectiveness between the pump head and the pump body, making it not easy to loosen during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The technical solution of the utility model is further described below in conjunction with the accompanying drawings:

[0022] Figure 1 : Side view of the centrifugal pump;

[0023] Figure 2 : Rear view of the centrifugal pump;

[0024] Figure 3 : Schematic diagram of the pump head;

[0025] Figure 4 : Schematic diagram of connecting bracket;

[0026] Figure 5 : Schematic diagram of the assembly of the centrifugal pump and the connecting bracket;

[0027] Figure 6 : Figure 5 Enlarged schematic diagram of part A. DETAILED DESCRIPTION

[0028] The present invention will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings. However, these embodiments are not limited to the present invention, and any structural, methodological, or functional changes made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0029] In the description of the scheme, it should be noted that the terms "center", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. Moreover, in the description of the scheme, with the operator as a reference, the direction close to the operator is the proximal end, and the direction away from the operator is the distal end.

[0030] like Figures 1 to 3 As shown, the utility model discloses a centrifugal pump, comprising a pump head 1 and a pump body detachably connected as one body, the pump head 1 having an inlet blood vessel 101 and an outlet blood vessel 102, the outlet blood vessel 102 is tangent to the outer side of the pump head 1 and extends forward, and the outlet blood vessel 102 is preferably arranged at the axis of the pump head 1. Such a structure facilitates blood to enter the pump head 1 from the inlet blood vessel 101 and be discharged from the outlet blood vessel 102 under the action of centrifugal force.

[0031] like Figure 1 , Figure 2 , Figure 3 and Figure 6As shown, the pump body includes a housing 2 and a driver (not shown) built into the housing 2. A pump head seat 4 is provided on the top of the housing 2, and a truncated cone 401 is provided at the axis of the pump head seat 4. A group of blocks 402 are evenly distributed on the outer peripheral wall of the truncated cone 401. The bottom of the pump head 1 has a skirt 103 matching the truncated cone 401, and an L-shaped bayonet 104 matching the block 402 is provided on the skirt 103. The block 402 is clamped at the first end 1041 of the bayonet 104 to limit the axial movement of the pump head 1; the pump head seat 4 is also provided with an elastic block 5 that moves axially relative to the pump head seat 4, and the elastic block 5 has a clamping arm 501 extending toward the truncated cone 401. When the clamping block 402 is clamped with the bayonet 104, the clamping arm 501 is clamped into the second end 1042 of the bayonet 104 to limit the circumferential movement of the pump head 1. The L-shaped structure of the bayonet 104 guides the movement of the clamping block 402, so that the clamping block 402 moves along the shape of the bayonet 104. At the same time, the pump head 1 and the pump body can be quickly connected or disassembled using the clamping block 402 and the bayonet 104. The clamping block 402 is engaged with the first end 1041 of the bayonet 104 to limit the axial movement of the pump head 1, and the elastic block 5 is engaged with the second end 1042 of the bayonet 104 to limit the axial movement of the pump head 1. On the one hand, it is convenient for the rapid replacement of the pump head 1, and on the other hand, it can enhance the connection stability and effectiveness between the pump head 1 and the pump body, making it not easy to loosen during use, especially the stability during movement.

[0032] Furthermore, a groove 403 is provided on the side of the pump head seat 4, and the elastic block 5 is slidably embedded in the groove 403. A positioning column 503 and a spring 502 are provided between the inside of the elastic block 5 and the groove 403. The positioning column 503 is fixed on the bottom surface of the groove 403. The spring 502 is sleeved on the positioning column 503 and its two ends are respectively in contact with the bottom surface of the elastic block 5 and the groove 403. The elastic block 5 moves axially relative to the housing 2 under the elastic force of the spring 502.

[0033] The inner side wall of the elastic block 5 has an arc that matches the outer peripheral wall of the truncated cone 401, and a portion of the inner side wall of the elastic block 5 is concave to form an abutment surface that matches the skirt 103, and the other portion forms a clamping arm 501 that matches the second end 1042 of the bayonet 104. This arrangement allows the clamping arm 501 to be integrally formed with the elastic block 5, simplifies the processing steps, and ensures the connection strength between the clamping arm 501 and the elastic block 5, making it difficult to break. At the same time, the elastic block 5 can form an abutment surface that matches the skirt 103 to limit the elastic block 5.

[0034] The working principle of the elastic block 5 is as follows: first, the block 402 is aligned with the second end 1042 of the bayonet 104, so that the skirt 103 moves down along the pump head seat 4. At this time, the clamping arm 501 and the bayonet 104 are not aligned, so that the skirt 103 automatically and synchronously presses down the elastic block 5; then, the pump head 1 is rotated so that the block 402 moves to the first end 1041 of the bayonet 104. At this time, the clamping arm 501 and the second end 1042 of the bayonet 104 are facing each other, and the clamping arm 501 can move up along the bayonet 104 and be clamped at the second end 1042 of the bayonet 104. The diameter of the clamping arm 501 matches the width of the second end 1042 of the bayonet 104, so that the pump head 1 cannot rotate relative to the pump head seat 4 at this time, thereby achieving the purpose of limiting the circumferential movement of the pump head 1 by the clamping arm 501.

[0035] like Figure 1 and Figure 2 As shown, a connecting protrusion 201 protruding from the surface is formed on the side of the housing 2. The surface of the connecting protrusion 201 is preferably a plane and the surface is perpendicular to the outlet blood vessel 102. An inclined extending connecting plug 3 is fixed on the connecting protrusion 201. The surface of the connecting protrusion 201 is a plane, which can enhance the connection stability between the device and the connecting plug 3. The connecting plug 3 is fixed on the connecting protrusion 201 by a set of screws. In a preferred embodiment, the housing 2 is prismatic. In other feasible embodiments, the housing 2 can be of any suitable shape. The surface of the connecting protrusion 201 is perpendicular to the outlet blood vessel 102 so that the setting position of the connecting plug 3 can control the height of the outlet blood vessel 102. Further, an angle is formed between the axis of the connecting plug 3 and the axis of the pump body, so that when the connecting plug 3 is in a vertical state, the pump body and the pump head 1 are tilted and the pipe mouth of the outlet blood vessel 102 is located at the top of the inner cavity of the pump head 1. Such a structure enables the pump body to be tilted when the connecting plug 3 is vertically arranged, so that the outlet of the blood vessel 102 is located at the top of the inner cavity of the pump head 1, thereby maximizing the discharge efficiency of the gas in the blood and reducing the generation of heat.

[0036] Preferably, the inclination angle of the connecting plug 3 relative to the axis of the housing 2 is between 17° and 26°, so that the port of the blood outlet tube 102 is in the highest position, so as to facilitate the discharge of air in the pump head 1 during pre-filling.

[0037] In order to facilitate the insertion of the connecting plug 3, the bottom of the connecting plug 3 has two sides with inwardly inclined guiding slopes 302. At the same time, a concave slot 301 is formed on one side of the connecting plug 3 for fixed connection.

[0038] like Figure 4 , Figure 5 The utility model also discloses a connecting bracket for placing the centrifugal pump, including a supporting frame 6 and a connecting seat 7, wherein the connecting seat 7 includes a slot 701 and a locking block 702, wherein the slot 701 matches the connecting plug 3 and is vertically arranged on the supporting frame 6, and notches 703 matching the card slot 301 are formed on both sides of the slot 701, and the locking block 702 is horizontally slidably arranged on the back side of the slot 701, and the two ends of the locking block 702 are respectively a locking end 7021 and a releasing end 7022, and the locking end 7021 and the releasing end 7022 both match the notch 703, and the inner side wall of the locking end 7021 has a wedge block 7023, and a reset spring 704 is arranged between the releasing end 7022 and the connecting seat 7, and the locking block 702 locks or releases the connecting plug 3 by sliding relative to the connecting seat 7. The inner side of the wedge block 7023 is inclined from top to bottom, which is compatible with the insertion direction of the connecting plug 3, so that the locking block 702 can be pushed to move when the connecting plug 3 is inserted, thereby improving the insertion efficiency of the connecting plug 3. After the connecting plug 3 is inserted, the locking block 702 is automatically reset under the elastic force of the reset spring 704, so that the card slot 301 is engaged with the locking end 7021, and the locking block 702 locks the connecting plug 3. The structure in which the connecting seat 7 cooperates with the connecting plug 3 can not only quickly install or disassemble the centrifugal pump, but also ensure the placement stability of the centrifugal pump. At the same time, the structure in which the slot 701 is vertically arranged enables the centrifugal pump to be arranged tilted to ensure that the outlet of the blood vessel 102 is located at the highest point to improve the exhaust efficiency. At the same time, the tilted arrangement of the pump head body can ensure the continuous flow of blood inside the pump head 1, reduce the generation of thrombus inside the pump head 1, and effectively avoid the destruction of blood cells in the blood.

[0039] Furthermore, an elastic column 705 is provided at the bottom of the slot 701 and can be extended and retracted relative to the slot 701. A second spring is sleeved on the elastic column 705 to always apply an upward thrust to the elastic column 705. When the connecting plug 3 is inserted into the slot 701, the top of the elastic column 705 abuts against the bottom of the connecting plug 3. The setting of the elastic column 705 enables the elastic column 705 to apply an upward thrust to the bottom of the connecting plug 3 after the connecting plug 3 is inserted into the slot 701, so as to enhance the clamping stability and tightness between the clamping slot 301 and the locking end 701, so that the connecting plug 3 is not easily loosened or falls off due to external influences.

[0040] In order to improve the smoothness of movement of the locking block 702 relative to the slot 701, a group of horizontally extending waist-shaped holes 7024 are provided on the locking block 702, and a connecting pin 706 is provided in the connecting seat 7. The connecting pin 706 is passed through the waist-shaped hole 7024, so that the locking block 702 can move horizontally relative to the connecting seat 7.

[0041] Furthermore, the connecting bracket also includes a connecting support plate 8 , which is vertically fixed on the supporting frame 6 , and the connecting seat 7 is vertically fixed on the connecting support plate 8 .

[0042] In addition, the utility model also discloses an extracorporeal membrane oxygenation device including the centrifugal pump and the connection bracket, wherein the centrifugal pump is inserted into the connection seat 7 via the connection plug block 3, and the connection plug block 3 is inserted into the connection seat 7 so that the centrifugal pump is tilted relative to the connection bracket, so that the outlet of the blood vessel 102 is located at the top of the inner cavity of the centrifugal pump. The extracorporeal membrane oxygenation device also includes other existing components, such as a control host, an oxygenator, etc., which are not the focus of this solution and will not be described here.

[0043] It should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0044] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the utility model. They are not intended to limit the protection scope of the utility model. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A centrifugal pump, comprising a pump head and a pump body detachably connected into one body, wherein the pump body comprises a housing; characterized in that: A pump head seat is arranged on the top of the shell, a frustum is arranged on the axis of the pump head seat, and a group of clamping blocks are evenly distributed on the outer peripheral wall of the frustum; the bottom of the pump head has a skirt matching the frustum, and the skirt is provided with an L-shaped bayonet matching the clamping block; the clamping block is clamped at the first end of the bayonet to limit the axial movement of the pump head.

2. The centrifugal pump according to claim 1, characterized in that: The pump head seat is also provided with an elastic block which can move axially relative to the pump head seat, and the elastic block has a clamping arm extending toward the frustum; when the clamping block is clamped with the bayonet, the clamping arm is clamped into the second end of the bayonet to limit the circumferential movement of the pump head.

3. The centrifugal pump according to claim 2, characterized in that: The diameter of the clamp arm matches the width of the second end of the clamp port.

4. The centrifugal pump according to claim 2 or 3, characterized in that: Align the clamping block with the second end of the bayonet so that the skirt moves down along the pump head seat, and the clamping arm and the bayonet are not aligned, so that the skirt automatically and synchronously presses down the elastic block; rotate the pump head so that the clamping block moves to the first end of the bayonet, and the clamping arm and the second end of the bayonet are opposite, and the clamping arm can move up along the bayonet and be clamped at the second end of the bayonet, so that the pump head cannot rotate relative to the pump head seat.

5. The centrifugal pump according to claim 2, characterized in that: A groove is arranged on the side of the pump head seat, and the elastic block is slidably embedded in the groove; a spring is arranged between the inside of the elastic block and the groove, and a positioning column is fixed on the bottom surface of the groove. The spring is sleeved on the positioning column and its two ends are respectively in contact with the elastic block and the bottom surface of the groove.

6. The centrifugal pump according to claim 5, characterized in that: The elastic block moves axially relative to the housing under the elastic force of the spring.

7. The centrifugal pump according to claim 5, characterized in that: The inner side wall of the elastic block has an arc that matches the outer peripheral wall of the truncated cone, and a portion of the inner side wall of the elastic block is concave to form an abutment surface that matches the skirt, and the other portion forms a clamping arm that matches the second end of the bayonet.

Images