Diaphragm pump and ventricular assist device

Abstract

The utility model relates to the field of medical instruments, and discloses a diaphragm pump and a ventricular assist device using the diaphragm pump. The diaphragm pump comprises a shell with a cavity and a diaphragm piece arranged in the cavity, and the diaphragm piece divides the cavity into a blood chamber used for being communicated with the heart and an air chamber used for being communicated with inflation and deflation equipment. The shell comprises a first half shell and a second half shell which are in butt joint and form a cavity, the first half shell is provided with a first circumferential edge, and the second half shell is provided with a second circumferential edge; corresponding pairing structures are arranged on the first circumferential edge and the second circumferential edge. After the first half shell and the second half shell are in butt joint, the pairing structures can form an attaching seam which communicates with the cavity and is obliquely arranged relative to the axis of the diaphragm pump. And the plugging part is formed on the first half shell or the second half shell and extends for a preset length in the axis direction of the diaphragm pump so as to shield an outlet, communicated with the cavity, of the attaching seam, and when the blood chamber is subjected to positive pressure, the plugging part gradually presses the outlet along with movement of the first half shell or the second half shell.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a diaphragm pump and a ventricular assist device using the diaphragm pump. Background Art

[0002] Mechanical circulatory support (MCS) is a life support technology that mechanically assists the body's blood circulation, maintains effective blood perfusion of tissues, and reduces the burden on the heart. It is an important treatment for critical heart illness and is also called a ventricular assist device (VAD).

[0003] The VAD catheter is a type of ventricular assist device that can draw blood from the venous system or the heart and directly pump it into the artery. Chinese patent CN117085241A discloses an external pulsating minimally invasive interventional ventricular mechanical assist device. The ventricular mechanical assist device comprises a catheter (1), a connector (2) and a diaphragm pump (3), wherein the front end of the catheter (1) is a suction tip (4), the rear end of the catheter (1) is connected to one end of the connector (2), and the other end of the connector (2) is connected to the diaphragm pump (3). The catheter (1) is used to enter the heart through the femoral artery, and the suction tip (4) is located in the left ventricle, the connector (2) and the diaphragm pump (3) are located outside the body, and the diaphragm pump (3) is used to extract and reinject blood at a set pulsating frequency under the control and drive of a control unit (6). For another example, Chinese patent CN116712666A discloses a ventricular assist pump device, comprising a catheter, a diaphragm pump and a blood flow guide valve.

[0004] As can be seen from the above disclosed text, the diaphragm pump in the prior art includes an upper shell, a lower shell and a flexible membrane pressed between the upper shell and the lower shell. The upper shell and the lower shell are horizontally docked, and the flexible membrane divides the shell into two compartments, one compartment contains blood and the other compartment contains gas. The blood compartment in the diaphragm pump is connected to the heart through a catheter. The drive unit of the diaphragm pump generates negative pressure and positive pressure (relative to the current pressure in the inner cavity and the blood compartment) to alternately remove gas from the air chamber and press gas into the air chamber. In the suction stage, the negative pressure pulls the flexible membrane to one side of the shell, and blood is sucked into the blood compartment of the membrane pump. This is followed by an ejection stage, when the pressure pushes the flexible membrane from one side of the shell to the other side, thereby discharging blood from the shell and entering the aorta through the catheter. When the blood compartment is subjected to positive pressure, a vertical relative displacement occurs between the upper and lower shells, resulting in a gap between the upper and lower shells. After the blood enters the gap between the upper and lower shells, it no longer flows and forms a thrombus. The thrombus in the blood chamber is likely to fall off and enter the human body with the blood, causing related complications.

[0005] Based on this, the existing technology still needs to be improved. Utility Model Content

[0006] The main purpose of the utility model is to provide a diaphragm pump to solve the problem that blood clots are prone to occur in the blood compartment of the existing diaphragm pump, and complications are easily caused after the blood clots enter the human body.

[0007] According to one aspect of the utility model, a diaphragm pump is provided, comprising a housing having a cavity and a diaphragm disposed in the cavity, wherein the diaphragm divides the cavity into a blood chamber for communicating with the heart and an air chamber for communicating with an inflation and exhaust device;

[0008] The housing comprises a first half shell and a second half shell which are butted together to form the cavity, the first half shell is provided with a first circumferential edge, and the second half shell is provided with a second circumferential edge; corresponding matching structures are arranged on the first circumferential edge and the second circumferential edge, and the matching structures can form a fitting seam which is connected to the cavity and is arranged obliquely relative to the axis of the diaphragm pump after the first half shell and the second half shell are butted together;

[0009] The blocking portion is formed on the first half shell or the second half shell, and extends a predetermined length in the axial direction of the diaphragm pump to block the outlet connecting the fitting seam and the cavity, and when the blood chamber is subjected to positive pressure, the blocking portion gradually presses the outlet as the first half shell or the second half shell moves.

[0010] In the implementation of the above solution, when the first half shell and the second half shell are covered, the diaphragm is sandwiched between the two. The outer edge of the diaphragm extends at least to the outer edge of the fitting seam, and can extend as far as the maximum outer diameter of the first circumferential edge and the second circumferential edge of the matching. The matching structure is used to clamp the diaphragm and form a fitting seam inclined relative to the axis of the diaphragm pump. The blocking portion blocks the gap between the first half shell and the second half shell in a direction parallel to the axis of the diaphragm pump. When the first half shell and the second half shell are connected and subjected to positive pressure, the first half shell and the second half shell have a tendency to move away from each other and form a gap, and the sealing portion can just seal the gap between the two half shells. At the same time, the fitting seam is inclined relative to the parallel seam to achieve directional deformation. When the blood flow is pressurized in the blood chamber, it moves in a direction perpendicular to the inner wall of the cavity. The component force of the positive pressure in the fitting seam can further prevent the blood from entering the gap. Therefore, the gap of the diaphragm pump in this embodiment will store very little blood, so it is not easy to form thrombus, thereby avoiding the occurrence of complications in patients.

[0011] In one embodiment, the pairing structure comprises:

[0012] A first protrusion is arranged on the docking surface of the second circumferential edge, is arranged circumferentially around the axis of the diaphragm pump and extends along a first direction, and the first protrusion is provided with a first inclined surface;

[0013] A first groove portion is provided on the docking surface of the first circumferential edge, is arranged circumferentially around the axis of the diaphragm pump and is recessed in a first direction; the first groove portion is provided with a second inclined surface that is in contact with the first inclined surface; the first direction is a direction parallel to the axis of the diaphragm pump;

[0014] After the first half shell is covered on the second half shell, the second inclined surface is attached to the first inclined surface to form the attachment seam.

[0015] In another embodiment, the pairing structure comprises:

[0016] A second protrusion is arranged on the docking surface of the first circumferential edge, is arranged circumferentially around the axis of the diaphragm pump and extends along the second direction, and the second protrusion is provided with a third inclined surface;

[0017] The second groove portion is provided on the docking surface of the second circumferential edge, is arranged circumferentially around the axis of the diaphragm pump and is recessed in the second direction; the second groove portion is provided with a fourth inclined surface that is in contact with the third inclined surface; the second direction is a direction parallel to the axis of the diaphragm pump;

[0018] After the first half shell is covered on the second half shell, the third inclined surface and the fourth inclined surface are attached to form the attachment seam.

[0019] In one embodiment, the gap formed by the matching structure further includes a horizontal gap and a vertical gap arranged in sequence, and the vertical gap is smoothly connected to the fitting gap through a curved gap.

[0020] In one embodiment, the inclination angle of the fitting seam relative to the axis of the diaphragm pump is 10-80°.

[0021] In one embodiment, the maximum outer diameter of the first protrusion is smaller than the outer diameter of the second circumferential edge, and the first protrusion is arranged on the side of the second circumferential edge close to the cavity; the portion of the second circumferential edge away from the other side of the cavity is used to dock with the first circumferential edge of the first half shell to form the horizontal seam.

[0022] In another embodiment, the maximum outer diameter of the second protrusion is smaller than the outer diameter of the first circumferential edge, and the second protrusion is arranged on the side of the first circumferential edge close to the cavity; the portion of the edge of the first circumferential edge on the other side away from the cavity is used to dock with the second circumferential edge of the second half shell to form the horizontal seam.

[0023] In one embodiment, a receiving groove is provided in the fitting seam, and the receiving groove receives the first sealing ring.

[0024] In one embodiment, a second sealing ring and a third sealing ring arranged side by side are provided in the vertical seam, and the diameters of the second sealing ring and the third sealing ring are smaller than the diameter of the first sealing ring.

[0025] According to another aspect of the utility model, a ventricular assist device is also provided, comprising a catheter, a trachea and a diaphragm pump as described in any of the above embodiments, wherein the front end of the catheter is a suction tip, the rear end of the catheter is connected to the blood chamber of the diaphragm pump via a first connecting vessel, and the trachea is connected to the air chamber of the diaphragm pump via a second connecting vessel.

[0026] In the technical solution shown in the present application, a matching structure is provided on the first circumferential edge of the first half shell and on the second circumferential edge of the second half shell. The matching structure is used to clamp the diaphragm sheet and form a fitting seam inclined relative to the axis of the diaphragm pump. At the same time, a blocking portion is provided on the first half shell or the second half shell to block the gap formed after the first half shell and the second half shell are covered. When the first half shell and the second half shell are subjected to positive pressure after docking, the first half shell and the second half shell have a tendency to move away from each other and form a gap. The blocking portion blocks the gap between the two half shells. As the first half shell or the second half shell moves, the blocking portion gradually presses the gap outlet, which can prevent blood from entering the gap. Therefore, the gap of the diaphragm pump in this embodiment will store very little blood, so it is not easy to form thrombus, avoiding the occurrence of complications in patients. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solution of the embodiment of the utility model, the drawings required for use in the embodiment will be briefly introduced below. Obviously, the drawings described below are only some implementation cases of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A schematic diagram of a diaphragm pump provided in one embodiment of the present application;

[0029] Figure 2 A schematic diagram of a diaphragm pump provided according to another embodiment of the present application;

[0030] Figure 3 A schematic diagram of a diaphragm pump provided according to another embodiment of the present application;

[0031] Figure 4 A working principle diagram of a blocking portion provided according to an embodiment of the present application;

[0032] Figure 5 A force analysis diagram of a horizontal joint and an inclined joint under positive pressure provided in an embodiment of the present application;

[0033] Figure 6 A schematic diagram of the structure of a ventricular assist device provided in one embodiment of the present application.

[0034] Description of reference numerals:

[0035] 100, shell; 110, first half shell; 111, first circumferential edge; 1110, first groove portion; 1111, second protrusion portion; 1112, hot melt strip; 112, second circumferential edge; 1120, first protrusion portion; 1121, second groove portion; 1122, groove; 120, second half shell; 130, curved seam; 140, vertical seam; 150, horizontal seam; 160, fitting seam; 200, diaphragm; 300, blood chamber; 400, air chamber; 500, sealing portion; 600, catheter; 700, trachea; 800, first connecting vessel; 900, second connecting vessel. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0038] The present application is further described in detail below in conjunction with the accompanying drawings.

[0039] Figure 1 This is a schematic diagram of a diaphragm pump provided in one embodiment of the present application. Figure 1 The diaphragm pump includes a housing 100 formed with a cavity and a diaphragm 200 disposed in the cavity. The diaphragm 200 divides the cavity into a blood chamber 300 for communicating with the heart and an air chamber 400 for communicating with an inflation and exhaust device.

[0040] The housing 100 includes a first half shell 110 and a second half shell 120 that are butted together to form a cavity. The first half shell 110 is provided with a first circumferential edge 111, and the second half shell 120 is provided with a second circumferential edge 112. Corresponding matching structures are arranged on the first circumferential edge 111 and the second circumferential edge 112. After the first half shell 110 and the second half shell 120 are butted together, the matching structures can form a fitting seam 160 that is connected to the cavity and is tilted relative to the axis of the diaphragm pump.

[0041] The sealing portion 500 is formed on the first half shell 110 and extends a predetermined length in the axial direction of the diaphragm pump (the direction indicated by the double-headed arrow in the figure) to seal the outlet of the fitting slit 160 communicating with the cavity, while fitting the diaphragm sheet 200 tightly to the inner wall of the cavity.

[0042] In the illustrated embodiment, when the first half shell 110 and the second half shell 120 are covered, the diaphragm 200 is sandwiched between the two. The outer edge of the diaphragm 200 extends at least to the outer edge of the fitting seam, and can extend as far as the maximum outer diameter of the first circumferential edge 111 and the second circumferential edge 112 that are matched. The matching structure is used to clamp the diaphragm 200, and at the same time form a fitting seam that is inclined relative to the axis of the diaphragm pump, and the blocking portion blocks the gap between the first half shell 110 and the second half shell 120 in a direction parallel to the axis of the diaphragm pump. When the first half shell 110 and the second half shell 120 are connected and subjected to positive pressure, the first half shell 110 and the second half shell 120 tend to move away from each other and form a gap, and the sealing part can just block the gap between the two half shells. At the same time, the sealing part gradually presses the gap outlet as the first half shell or the second half shell moves, which can prevent blood from entering the gap. Therefore, the gap of the diaphragm pump in this embodiment will rarely store blood, so it is not easy to form thrombus, thereby avoiding the occurrence of complications in patients.

[0043] See also Figure 1 The matching structure configured on the first circumferential edge 111 and the second circumferential edge 112 includes a first protrusion portion 1120 and a first groove portion 1110 .

[0044] The first protrusion 1120 is disposed on the docking surface of the second circumferential edge 112, circumferentially arranged around the axis of the diaphragm pump and along the first direction ( Figure 1 The first protrusion 1120 is provided with a first inclined surface. The docking surface provided on the first circumferential edge 111 is arranged circumferentially around the axis of the diaphragm pump and is recessed in the first direction; the first groove 1110 is provided with a second inclined surface that is in contact with the first inclined surface. After the first half shell 110 is covered on the second half shell 120, the second inclined surface is in contact with the first inclined surface to form a contact seam 160.

[0045] Figure 2 FIG. 1 is a schematic diagram of a diaphragm pump according to another embodiment of the present application. Figure 2 The matching structures arranged on the first circumferential edge 111 and the second circumferential edge 112 include a second protruding portion 1111 and a second groove portion 1121 .

[0046] The second protrusion 1111 is disposed on the docking surface of the first circumferential edge 111, circumferentially arranged around the axis of the diaphragm pump and along the second direction ( Figure 2 The second protrusion 1111 is provided with a third inclined surface. The second groove portion 1121 is provided on the docking surface of the second circumferential edge 112, is arranged circumferentially around the axis of the diaphragm pump and is recessed in the second direction. The second groove portion 1121 is provided with a fourth inclined surface that is in contact with the third inclined surface. The second direction is a direction parallel to the axis of the diaphragm pump. After the first half shell 110 is covered on the second half shell 120, the third inclined surface is in contact with the fourth inclined surface to form the bonding seam 160.

[0047] In this embodiment, the sealing portion 500 is formed on the second half shell 120 and extends a predetermined length in the axial direction of the diaphragm pump (the direction indicated by the double-headed arrow in the figure) to seal the outlet connecting the fitting seam 160 and the cavity, while tightly fitting the diaphragm sheet 200 to the inner wall of the cavity.

[0048] Figure 3 FIG. 1 is a schematic diagram of a diaphragm pump according to another embodiment of the present application. Figure 3 , in this embodiment, compared to Figure 1 In the diaphragm pump structure shown in FIG, the maximum outer diameter of the first protrusion 1120 disposed on the second circumferential edge 112 is smaller than the outer diameter of the first circumferential edge 111, and the first protrusion 1120 is arranged on the side of the second circumferential edge 112 close to the cavity. The part of the edge of the second circumferential edge 112 away from the other side of the cavity is used to dock with the first circumferential edge 111 of the first half shell 110. In this embodiment, the first protrusion 1120 includes a first inclined surface, a curved surface and a vertical surface connected in sequence. Correspondingly, the first circumferential edge 111 is provided with a second inclined surface, a curved surface and a vertical surface connected in sequence. Therefore, after the first half shell 110 and the second half shell 120 are docked, the gap formed by the matching structure includes a fitting seam 160, a curved seam 130, and a vertical seam 140 arranged in sequence. The vertical seam 140 is smoothly connected to the fitting seam 160 through a curved seam. The portion of the second circumferential edge 112 away from the other side of the cavity, that is, the portion of the edge without the first protrusion 1120 , forms a horizontal seam 150 after docking with the first circumferential edge 111 of the first half shell 110 .

[0049] In the illustrated embodiment, the sealing portion 500 is formed on the first half shell 110 and extends a predetermined length in the axial direction of the diaphragm pump (the direction indicated by the double-headed arrow in the figure) to seal the outlet of the fitting seam 160 connected to the cavity, while tightly fitting the diaphragm sheet 200 to the inner wall of the cavity.

[0050] It should be noted that in Figure 2 In the diaphragm pump structure shown in FIG. 1 , the second protrusion 1111 may also be of the same Figure 3 In a similar structure, even if the maximum outer diameter of the second protrusion 1111 is smaller than the outer diameter of the first circumferential edge 111, the second protrusion 1111 is arranged on the side of the first circumferential edge 111 close to the cavity. The first protrusion 1120 includes a third inclined surface, a curved surface and a vertical surface connected in sequence. Correspondingly, the second circumferential edge 112 is provided with a fourth inclined surface, a curved surface and a vertical surface connected in sequence. After the first half shell 110 and the second half shell 120 are docked, the gap formed by the matching structure includes a fitting seam 160, a curved seam and a vertical seam 140 arranged in sequence. The portion of the edge of the first circumferential edge 111 away from the other side of the cavity is used to dock with the second circumferential edge 112 of the second half shell 120 to form a horizontal seam. In this embodiment, the blocking portion 500 is formed on the second half shell 120 and extends a predetermined length in the axial direction of the diaphragm pump (the direction indicated by the double-headed arrow in the figure) to block the outlet of the fitting slit 160 communicating with the cavity, and at the same time, the diaphragm sheet 200 is closely fitted to the inner wall of the cavity. Figure 3 Similarly, the structure of the diaphragm pump is omitted in this embodiment.

[0051] It should be noted that the pairing structures shown in the above embodiments are exemplary, and the pairing structures may also adopt pairing structures such as an injected wavy concave-convex interlocking structure and a sawtooth concave-convex interlocking structure. Any pairing structure that can form a fitting seam 160 that is connected to the cavity and inclined relative to the axis of the diaphragm pump after the first half shell 110 and the second half shell 120 are docked falls within the protection scope of the present application.

[0052] In some embodiments, see Figure 1 The inclination angle a of the fitting seam 160 relative to the axis of the diaphragm pump is 10°-80°. Figure 4 The working principle diagram of the plugging part is shown. Figure 4, when the first half shell 110 is subjected to positive pressure, that is, when the pressure in the blood chamber is positive pressure P, the blood chamber wall is subjected to vertical pressure, and correspondingly, the blocking part 500 is also subjected to pressure perpendicular to the blood chamber wall. Under the action of this pressure, the blocking part 500 can better fit with the air chamber wall and block the outlet of the fitting seam. When the first half shell 110 and the second half shell 120 have a tendency to move away from each other and form a gap, the inclined setting of the fitting seam enables the blocking part 500 to gradually press the outlet of the gap during the movement of the first half shell or the second half shell, further preventing blood from entering the gap. In the structure of the existing diaphragm pump, when the two half shells are subjected to positive pressure, the gap of the horizontal seam increases with the increase of pressure. According to the analysis of the working principle of the above-mentioned blocking part, when the first half shell and the second half shell of the diaphragm pump in the present application are subjected to positive pressure, as the pressure increases, the blocking part gradually reduces the gap between the first half shell and the second half shell, which is exactly the opposite of the gap change trend of the diaphragm pump in the prior art. It can be seen from this that the gap of the diaphragm pump in the embodiment of the present application will store very little blood, and it is not easy to form blood clots, thereby avoiding the occurrence of complications in patients.

[0053] In a further embodiment, the inclination angle a of the fitting seam 160 relative to the axis of the diaphragm pump is 50°-80°. Figure 5 , when the positive pressure in the blood chamber increases, the first half shell and the second half shell have opposite movement trends, that is, the horizontal slit has a tendency to become larger and larger. When the first half shell and the second half shell stop moving, the gap of the horizontal slit is △x. When the blood chamber is subjected to a positive pressure with the same change trend and the same pressure value as above, the gap of the inclined slit formed between the first half shell and the second half shell is also △x, and the spacing of the inclined slit in the vertical direction is x1, and x1 is smaller than △x. That is, when subjected to positive pressure in the same pressure value range, the setting of the inclined slit produces a smaller spacing in the vertical direction. Compared with the gap of the horizontal slit in the vertical direction, the inclined slit has a smaller gap. The smaller the gap, the more difficult it is for blood to enter. When blood is difficult to enter, blood is not easy to gather and thrombus is difficult to form.

[0054] for Figure 2 The diaphragm pump of the structure described in the above has the same principle as that of Figure 4 Similar to the above, except that the direction of movement of the blocking part is Figure 1 On the contrary, since the working principle is the same, it will not be repeated here.

[0055] In some embodiments, see Figure 1-Figure 4 The fitting seam 160 is provided with a receiving groove, and the receiving groove receives the first sealing ring. The diameter of the first sealing ring is greater than the depth of the receiving groove. The first sealing ring is provided to form a good sealing effect at the fitting seam 160 when the first half shell 110 and the second half shell 120 are covered.

[0056] In some embodiments, see Figure 3 or Figure 4 The second sealing ring and the third sealing ring are arranged side by side in the vertical seam 140, and the diameters of the second sealing ring and the third sealing ring are smaller than the diameter of the first sealing ring. When the diaphragm pump is subjected to positive pressure or negative pressure, the pressure on the first sealing ring will be larger than that on the second sealing ring and the third sealing ring. If the diameter of the first sealing ring is set larger, when the first half shell 110 and the second half shell 120 are pressed together, the first sealing ring in the pressed seam will have a larger force bearing area, so it can withstand a larger pressure. At the same time, due to the larger force bearing area, its sealing effect will be better.

[0057] The second sealing ring and the third sealing ring are arranged side by side in the vertical direction (in the direction parallel to the axis of the diaphragm pump). When the first half shell 110 and the second half shell 120 are subjected to positive pressure or negative pressure, after being buffered by the first sealing ring, the second sealing ring is first subjected to the impact of the pressure, and then the third sealing ring is subjected to the impact of the pressure. Since the arrangement of the second sealing ring and the third sealing ring is perpendicular to the direction of the pressure, the pressure will first contact the groove wall of the groove after passing through the second sealing ring, and its pressure loss will be reduced. The third sealing ring after the pressure loss is finally subjected to the impact of the pressure. Since the pressure has undergone multiple losses, its impact force is very small at the position of the third sealing ring. Therefore, the arrangement of the second sealing ring and the third sealing ring can greatly increase the pressure loss. Due to the large loss, the position of the third sealing ring also has a good sealing effect.

[0058] In some embodiments, see Figure 1 or Figure 3 , the blocking portion 500 is integrally formed with the first half shell 110. Figure 2 The plugging portion 500 is integrally formed with the second half shell 120. The plugging portion 500 is integrally formed with the first half shell 110 or the second half shell 120. When the first half shell 110 and the second half shell 120 are covered, the plugging portion 500 can directly cover the outlet of the fitting seam 160 and appropriately squeeze the diaphragm sheet 200 on the inner wall of the cavity. The plugging portion 500 formed integrally with the half shell has a good plugging effect and does not fall off.

[0059] In some embodiments, the first half shell 110 and the second half shell 120 can be connected by thermal fusion, see Figure 3, a hot melt strip 1112 is provided on the first circumferential edge 111, and a groove 1122 is provided on the second circumferential edge 112. After the hot melt strip 1112 is heated, the first half shell 110 and the second half shell 120 are connected. In other embodiments, the first half shell 110 and the second half shell 120 can also be connected by ultrasonic plastic welding. It should be noted that the present application does not specifically limit the connection method of the first half shell 110 and the second half shell 120, and any method that can connect the first half shell 110 and the second half shell 120 falls within the protection scope of the present application.

[0060] According to another aspect of the present application, a ventricular assist device is also provided. Figure 6 , Figure 6 It includes a catheter 600, an trachea 700 and a diaphragm pump as described in any of the above embodiments, the front end of the catheter 600 is a suction tip, the rear end of the catheter is connected to the blood chamber 300 of the diaphragm pump through a first connecting vessel 800, and the trachea 700 is connected to the air chamber 400 of the diaphragm pump through a second connecting vessel 900.

[0061] The ventricular assist device using the above-mentioned diaphragm pump has very little blood stored in the gap of the diaphragm pump, and blood clots are not easily formed. Therefore, during the use of the ventricular assist device using the diaphragm pump, blood clots are not easily formed in the blood chamber, thereby avoiding related complications for patients and reducing the occurrence of medical accidents.

[0062] Those skilled in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the disclosure of the embodiments of the present invention (including the claims) is limited to these examples; under the concept of the embodiments of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and there are many other changes in different aspects of the above embodiments of the present invention, which are not provided in detail for the sake of simplicity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.

Claims

1. A diaphragm pump, characterized in that: The invention comprises a shell having a cavity and a diaphragm arranged in the cavity, wherein the diaphragm divides the cavity into a blood chamber for communicating with the heart and an air chamber for communicating with an inflation and exhaust device; The housing comprises a first half shell and a second half shell which are butted together to form the cavity, the first half shell is provided with a first circumferential edge, and the second half shell is provided with a second circumferential edge; corresponding matching structures are arranged on the first circumferential edge and the second circumferential edge, and the matching structures can form a fitting seam which is connected to the cavity and is arranged obliquely relative to the axis of the diaphragm pump after the first half shell and the second half shell are butted together; The blocking portion is formed on the first half shell or the second half shell, and extends a predetermined length in the axial direction of the diaphragm pump to block the outlet connecting the fitting seam and the cavity, and when the blood chamber is subjected to positive pressure, the blocking portion gradually presses the outlet as the first half shell or the second half shell moves.

2. The diaphragm pump according to claim 1, characterized in that: The pairing structure comprises: A first protrusion is arranged on the docking surface of the second circumferential edge, is arranged circumferentially around the axis of the diaphragm pump and extends along a first direction, and the first protrusion is provided with a first inclined surface; A first groove portion is provided on the docking surface of the first circumferential edge, is arranged circumferentially around the axis of the diaphragm pump and is recessed in a first direction; the first groove portion is provided with a second inclined surface that is in contact with the first inclined surface; the first direction is a direction parallel to the axis of the diaphragm pump; After the first half shell is covered on the second half shell, the second inclined surface is attached to the first inclined surface to form the attachment seam.

3. The diaphragm pump according to claim 1, characterized in that: The pairing structure comprises: A second protrusion is arranged on the docking surface of the first circumferential edge, is arranged circumferentially around the axis of the diaphragm pump and extends along the second direction, and the second protrusion is provided with a third inclined surface; The second groove portion is provided on the docking surface of the second circumferential edge, is arranged circumferentially around the axis of the diaphragm pump and is recessed in the second direction; the second groove portion is provided with a fourth inclined surface that is in contact with the third inclined surface; the second direction is a direction parallel to the axis of the diaphragm pump; After the first half shell is covered on the second half shell, the third inclined surface and the fourth inclined surface are attached to form the attachment seam.

4. The diaphragm pump according to any one of claims 1 to 3, characterized in that: The gap formed by the matching structure also includes a horizontal gap and a vertical gap that are arranged in sequence, and the vertical gap is smoothly connected to the fitting gap through a curved gap.

5. The diaphragm pump according to claim 4, characterized in that: The inclination angle of the fitting seam relative to the axis of the diaphragm pump is 10-80°.

6. The diaphragm pump according to claim 4, characterized in that: When the matching structure includes a first protrusion and a first groove, the maximum outer diameter of the first protrusion is smaller than the outer diameter of the second circumferential edge, and the first protrusion is arranged on the side of the second circumferential edge close to the cavity; the part of the second circumferential edge away from the other side of the cavity is used to dock with the first circumferential edge of the first half shell to form the horizontal seam.

7. The diaphragm pump according to claim 4, characterized in that: When the matching structure includes a second protrusion and a second groove, the maximum outer diameter of the second protrusion is smaller than the outer diameter of the first circumferential edge, and the second protrusion is arranged on the side of the first circumferential edge close to the cavity; the part of the edge of the first circumferential edge away from the other side of the cavity is used to dock with the second circumferential edge of the second half shell to form the horizontal seam.

8. The diaphragm pump according to claim 4, characterized in that: A receiving groove is arranged in the fitting seam, and the receiving groove receives the first sealing ring.

9. The diaphragm pump according to claim 8, characterized in that: A second sealing ring and a third sealing ring arranged side by side are arranged in the vertical seam, and the diameters of the second sealing ring and the third sealing ring are smaller than the diameter of the first sealing ring.

10. A ventricular assist device, characterized in that: It comprises a catheter, an trachea and a diaphragm pump as described in any one of claims 1 to 9, wherein the front end of the catheter is a suction tip, the rear end of the catheter is connected to the blood chamber of the diaphragm pump through a first connecting vessel, and the trachea is connected to the air chamber of the diaphragm pump through a second connecting vessel.

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