Control handle and left ventricular assist device

Abstract

The present invention discloses a control handle and a left ventricular assist device, the control handle comprising: a housing; a delivery catheter, the distal end of which is connected to a blood pump system, and the proximal end of which is connected to a first cavity and a second cavity in sequence; a drive system, the output shaft of which is connected to the blood pump system; an infusion system, which is connected to the delivery catheter; a first sealing structure, which is used to control whether the first cavity is sealed; a second sealing structure, which is arranged in the second cavity and is used to seal the second cavity; the first sealing structure and the second sealing structure switch the working state based on the operating state of the drive system. The present invention adds a first sealing structure inside the housing, and through the coordinated cooperation of the first sealing structure and the second sealing structure, the driving system can seal the delivery catheter in different operating scenarios, and thus the sealing function of the delivery catheter can be realized regardless of whether the driving system is running, which protects the electronic components at the proximal end of the housing and improves the safety of the device.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a control handle and a left ventricular assist device. Background Art

[0002] A ventricular assist device can supplement the heart's function without completely replacing it. A ventricular assist device provides an implantable mechanical pump that helps blood flow from the heart's ventricles to the rest of the body or to other parts of the heart.

[0003] During the intervention of a ventricular assist device, blood will flow through the distal end of the ventricular assist device along the catheter to the control handle at the proximal end of the ventricular assist device. Therefore, the blood circulation needs to be blocked in the control handle to prevent damage to electronic components such as the motor in the handle and to protect the patient (to prevent excessive blood loss). Therefore, the control handle needs to have a dynamic sealing structure to prevent liquid leakage.

[0004] A Chinese invention patent with publication number CN112791305A discloses a blood pump and a power transmission component thereof. The patent uses a spiral seal to seal the channel. However, with this method, the sealing structure can only work when the motor rotates at a high speed. When the ventricular assist device is just inserted into the human body, the motor has not yet started, and the spiral seal does not work at this time. At the same time, when the ventricular assist device is removed from the body, the motor will stop running first, and then the device will be removed from the body. At this time, the spiral seal will also fail, causing the blood in the pipeline to flow to the motor and other devices, causing damage to the motor and other devices.

[0005] Therefore, it is necessary to improve the prior art to overcome the above defects in the prior art. Summary of the invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the dynamic sealing structure in the prior art cannot take into account the sealing failure when the motor stops, thereby providing a control handle and a left ventricular assist device.

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] Control handle, including:

[0009] case;

[0010] A delivery catheter, wherein the distal end of the delivery catheter is connected to the blood pump system, and the proximal end of the delivery catheter is disposed inside the housing and is connected to the first cavity and the second cavity in sequence;

[0011] A drive system is arranged inside the housing, wherein an output shaft of the drive system sequentially passes through the second cavity, the first cavity, the delivery catheter and is connected to the blood pump system, and the drive system is used to drive the blood pump system to operate;

[0012] an infusion system, connected to the delivery catheter, for providing cooling liquid to the drive system;

[0013] A first sealing structure, used to control whether the first cavity is sealed;

[0014] The second sealing structure is arranged in the second cavity and is used for sealing the second cavity; the first sealing structure and the second sealing structure switch the working state based on the operating state of the driving system; before the driving system is started and / or stopped, the first sealing structure seals the first cavity; after the driving system is started, the first sealing structure no longer seals the first cavity, and the second sealing structure seals the second cavity.

[0015] To further optimize the technical solution, the proximal end of the delivery catheter is connected to a first sealing ring locking piece, and the first cavity is arranged inside the first sealing ring locking piece.

[0016] To further optimize the technical solution, the first sealing structure includes:

[0017] A second sealing ring locking member, connected to the proximal end of the first sealing ring locking member and capable of moving relative to the first sealing ring locking member;

[0018] A sealing ring is arranged between the second sealing ring locking member and the first sealing ring locking member, and the sealing ring is located at the periphery of the output shaft of the drive system; the sealing ring is suitable for being squeezed and deformed and wrapping the output shaft of the drive system when the second sealing ring locking member moves relative to the first sealing ring locking member, so as to seal the first cavity;

[0019] The driving assembly is used to drive the second sealing ring locking member to move relative to the first sealing ring locking member.

[0020] To further optimize the technical solution, a first through hole and a second through hole are provided inside the first sealing ring locking member, the inner diameter of the second through hole is larger than the inner diameter of the first through hole, and a step is formed between the first through hole and the second through hole;

[0021] The second sealing ring locking member includes a second sealing ring locking member body and an abutment portion, wherein the abutment portion is located inside the second sealing ring locking member body and has a spacing with the second sealing ring locking member body, and the abutment portion is connected to the proximal end of the second sealing ring locking member body; the inner side wall of the second sealing ring locking member body is threadedly connected to the proximal outer side wall of the first sealing ring locking member, the abutment portion extends into the first cavity and corresponds to the step, and the abutment portion abuts against the sealing ring.

[0022] Further optimizing the technical solution, the driving component includes:

[0023] Rotate button;

[0024] A transmission shaft, coaxially connected with the rotary button;

[0025] The sealing ring locking member pushing member is coaxially connected to the transmission shaft and is meshed with the outer side wall of the second sealing ring locking member.

[0026] Further optimizing the technical solution, the drive system includes a motor having a motor shaft;

[0027] The output shaft of the drive system includes a spiral member, a steel shaft and a soft shaft. The spiral member is connected to the motor shaft through a motor connector. The steel shaft is fixedly connected to the spiral member. The steel shaft passes through the second cavity and the first cavity in sequence. The soft shaft is fixedly connected to the steel shaft and is arranged in the delivery catheter.

[0028] To further optimize the technical solution, the spiral element has a reverse thread structure, and both the proximal outer wall and the distal outer wall of the spiral element are provided with threads, and the threads on the proximal outer wall of the spiral element are in opposite rotation direction to the threads on the distal outer wall of the spiral element; the distal end of the spiral element is suitable for driving the liquid inside the second cavity under the drive of the motor to form a spiral vortex in the opposite direction to the rotation direction of the motor, and the moving direction of the spiral vortex in the second cavity is directed to the distal end of the control handle, and the force of the spiral vortex flowing toward the distal end of the handle is greater than the force of the liquid in the second cavity flowing toward the proximal end of the handle, so as to seal the proximal end of the second cavity.

[0029] To further optimize the technical solution, a control system for controlling the start and stop and the rotation speed of the drive system is provided on the shell, and a control button is provided on the control system.

[0030] To further optimize the technical solution, the shell is a split shell, and the shell is formed by snap-fitting a number of shell units.

[0031] Left ventricular assist devices, including:

[0032] a blood pump system that pumps blood from the left ventricle into the aorta;

[0033] The control handle, the delivery catheter of the control handle is connected to the blood pump system, and the output shaft of the drive system is connected to the blood pump system.

[0034] The technical solution of the present invention has the following advantages:

[0035] 1. The control handle provided by the present invention has a first sealing structure added inside the shell. Through the coordinated cooperation of the first sealing structure and the second sealing structure, the driving system can seal the delivery catheter in different operating scenarios, and thus the sealing function of the delivery catheter can be achieved regardless of whether the driving system is running or not. Before the driving system is started and stopped, the first sealing structure seals the first cavity, that is, the delivery catheter, so that the refluxed blood and the liquid input by the infusion system will not flow into the second cavity, let alone into the cavity of the driving system, which plays a good protective role for the electronic components at the proximal end of the shell and improves the safety of the device.

[0036] 2. The control handle provided by the present invention releases the first sealing structure when the drive system is running, and the second cavity is sealed only by the second sealing structure, so that the sealing ring of the first sealing structure will not wear out and fail. In addition, when the drive system rotates at a high speed, the first sealing structure is released, and the sealing ring in the first sealing structure will not deviate and cause sealing failure.

[0037] 3. The control handle provided by the present invention drives the second sealing ring locking member through the driving assembly, thereby controlling the distance between the second sealing ring locking member and the first sealing ring locking member. The sealing ring is squeezed and deformed by the relative movement between the first sealing ring locking member and the second sealing ring locking member, thereby controlling the sealing effect on the shaft. The control is very convenient, and the sealing ring does not affect the rotation of the output shaft of the drive system after being released. In addition, the present invention does not require high assembly accuracy and has a high yield rate.

[0038] 4. The control handle provided by the present invention divides the second sealing ring locking member into a second sealing ring locking member body and an abutting portion, so that it can abut against the sealing ring through the abutting portion, and can also realize the connection between the first sealing ring locking member and the second sealing ring locking member, and the abutting position between the abutting portion and the sealing ring can be sealed by the sealing ring, which can prevent liquid from leaking from this position.

[0039] 5. The control handle provided by the present invention can conveniently control the distance between the second sealing ring locking member and the first sealing ring locking member by rotating the rotary button located outside the shell, and can conveniently control the degree of extrusion of the sealing ring, thereby conveniently controlling the degree of sealing of the first cavity.

[0040] 6. The control handle provided by the present invention has a split shell, which is formed by snap-jointing a number of shell units, making disassembly and installation more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 A front view of the control handle provided by the present invention;

[0043] Figure 2 A side view of the control handle provided by the present invention;

[0044] Figure 3 A schematic diagram of the internal structure of the control handle provided by the present invention;

[0045] Figure 4 The control handle provided by the present invention Figure 1 A-A sectional view;

[0046] Figure 5 A simplified structural diagram of the sealing ring of the control handle provided by the present invention when it is not squeezed;

[0047] Figure 6 A simplified structural diagram of the sealing ring of the control handle provided by the present invention when it is squeezed;

[0048] Figure 7 The control handle provided by the present invention Figure 4 A partial enlarged view of .

[0049] Reference numerals:

[0050] 1. Motor, 2. First motor fixing part, 3. Second motor fixing part, 4. First housing unit, 5. Second housing unit, 6. Steel shaft, 7. Flexible shaft, 8. Connecting part, 9. Delivery catheter, 10. Limiting block, 11. Screw part, 12. Sealing ring, 13. First sealing ring locking part, 14. Second sealing ring locking part, 15. First motor connecting part, 16. Second motor connecting part, 17. Bearing, 18. Sealing ring locking part pushing part, 19. Transmission shaft, 20. Rotating button, 21. O-ring, 22. Infusion pipeline, 23. Third housing unit, 24. Fourth housing unit, 25. Fixed cylinder. DETAILED DESCRIPTION

[0051] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two components. The term "distal end" usually refers to the end of the medical implant away from the operator; the "proximal end" is the opposite of the "distal end" and refers to the end of the medical implant close to the operator. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0054] Example 1

[0055] like Figures 1 to 7 As shown, this embodiment discloses a control handle, including a housing, a delivery catheter 9, a drive system, an infusion system, a first sealing structure, and a second sealing structure. The distal end of the delivery catheter 9 is connected to the blood pump system, and the proximal end of the delivery catheter 9 is arranged inside the housing and is sequentially connected to the first cavity and the second cavity. The drive system is arranged inside the housing, and the output shaft of the drive system passes through the second cavity, the first cavity, the delivery catheter 9 in sequence and is connected to the blood pump system, and the drive system is used to drive the blood pump system to operate. The infusion system is connected to the delivery catheter 9 and is used to provide cooling liquid for the drive system. The first sealing structure is used to control whether the first cavity is sealed. The second sealing structure is arranged in the second cavity and is used to seal the second cavity. The first sealing structure and the second sealing structure switch the working state based on the running state of the drive system. Before the drive system is started and / or stopped, the first sealing structure seals the first cavity; when the drive system is started, the first sealing structure no longer seals the first cavity, and the second sealing structure seals the second cavity.

[0056] The control handle is provided with a first sealing structure inside the shell, and the first sealing structure and the second sealing structure cooperate with each other to realize the sealing of the delivery catheter 9 by the drive system in different operation scenarios, and thus the sealing function of the delivery catheter 9 can be realized regardless of whether the drive system is running or not. Before the drive system is started and stopped, the first sealing structure seals the first cavity, that is, the delivery catheter 9 is sealed, so that the refluxed blood and the liquid input by the infusion system will not flow into the second cavity, let alone into the cavity of the drive system, which plays a good protective role for the electronic components at the proximal end of the shell.

[0057] Most of the sealing structures in the prior art use a Variseal seal. Such a seal has high requirements on the eccentricity and runout of the connection structure due to the high speed of the motor. It is easy for the seal to fail due to installation errors. In addition, the Variseal seal and the motor shaft are prone to wear during rotation, which can cause particles to enter the blood.

[0058] After the drive system of this embodiment is started, the output shaft of the drive system is in a rotating state, and the first sealing structure will wrap the output shaft of the drive system after sealing, which may easily cause particles on the first sealing structure to fall off. Therefore, at this time, when the drive system of this embodiment is running, the first sealing structure is released, and the second cavity is sealed only by the second sealing structure, so that the sealing ring of the first sealing structure will not wear out and fail. In addition, when the drive system of this embodiment rotates at a high speed, the first sealing structure is released, and the sealing ring in the first sealing structure will not be offset and cause the sealing failure.

[0059] In the present invention, when the motor is not running, the sealing ring is only needed when the blood pump system is initially introduced into the human body and when the blood pump system is withdrawn. The sealing requirement is met by the dynamic structure (second sealing structure) during the rest of the surgical monitoring time. The present invention reduces the entry of particles into the blood vessels due to the wear of the first sealing structure, thereby improving the safety of the device.

[0060] In some embodiments, the infusion system includes an infusion line 22, and the infusion line 22 is connected to a liquid supply system. The liquid input by the infusion line 22 is physiological saline or glucose solution, and the liquid input contains anticoagulant substances. On the one hand, the input liquid can prevent blood reflux, and on the other hand, the input liquid can flow to the second cavity to cool down the motor and other components, thereby avoiding the accumulation of heat generated by the motor and other components.

[0061] In some embodiments, the proximal end of the delivery catheter 9 is fixedly connected with a first sealing ring locking member 13, and the first cavity is arranged inside the first sealing ring locking member 13. In this embodiment, the first sealing ring locking member 13 is arranged in a stepped cylinder shape, and the first sealing ring locking member 13 is divided into a first sleeve and a second sleeve connected in one piece, and a first through hole and a second through hole are arranged inside the first sealing ring locking member 13, and the inner diameter of the second through hole is larger than the inner diameter of the first through hole, and a step is formed between the first through hole and the second through hole.

[0062] In some embodiments, the first sealing structure includes a second sealing ring locking member 14, a sealing ring 12 and a driving assembly. The second sealing ring locking member 14 is connected to the proximal end of the first sealing ring locking member 13 and can move relative to the first sealing ring locking member 13. The sealing ring 12 is arranged between the second sealing ring locking member 14 and the first sealing ring locking member 13, and the sealing ring 12 is located on the periphery of the output shaft of the driving system. It should be noted that the sealing ring 12 in this embodiment is a silicone sealing ring, which has a certain elasticity. When the silicone sealing ring is subjected to the axial force of the driving system, axial and radial deformation will occur. The sealing ring 12 is suitable for being squeezed and deformed and wrapping the output shaft of the driving system when the second sealing ring locking member 14 moves relative to the first sealing ring locking member 13, so as to seal the first cavity. The driving assembly is used to drive the second sealing ring locking member 14 to move relative to the first sealing ring locking member 13.

[0063] In this embodiment, the second sealing ring locking member 14 is driven by the driving assembly to control the distance between the second sealing ring locking member 14 and the first sealing ring locking member 13. The sealing ring 12 is squeezed and deformed by the relative movement between the first sealing ring locking member 13 and the second sealing ring locking member 14, thereby controlling the sealing effect on the shaft.

[0064] The initial state is Figure 5 As shown; when the first cavity needs to be sealed, the driving assembly can directly drive the second sealing ring locking member 14 to move relative to the first sealing ring locking member 13, and the second sealing ring locking member 14 rotates into the first sealing ring locking member 13, and the second sealing ring locking member 14 squeezes the sealing ring 12 in the axial direction. The sealing ring 12 is radially deformed under the squeezed state, that is, the sealing ring 12 is tightly fitted with the output shaft of the driving system, and the state of the sealing ring is as shown in FIG. Figure 4 As shown in the figure, the shaft is clamped tightly to achieve the sealing of the shaft, and the sealing ring 12 blocks the liquid and blood in the first cavity. Figure 6 shown.

[0065] When there is no need to seal the first cavity, the driving component can directly drive the second sealing ring locking member 14 to move toward the first sealing ring locking member 13, so that the sealing ring 12 located therebetween is no longer squeezed, and the sealing ring 12 returns to its original state due to elasticity. At this time, a gap is generated between the sealing ring 12 and the output shaft of the driving system, and the first cavity can conduct liquid and blood.

[0066] Because the first sealing structure in this embodiment is mainly implemented by squeezing the sealing ring 12 and wrapping the sealing ring 12 around the output shaft of the drive system. If the driving system is started while the sealing ring 12 is squeezed, friction will occur between the output shaft of the driving system and the sealing ring 12, and there is a problem of the wear particles of the sealing ring entering the blood. In addition, this embodiment controls the first sealing ring to seal only at the beginning of the motor start-up and before the motor stops, thereby ensuring that there will be no wear and tear between the sealing rings to generate particles.

[0067] In some embodiments, the second sealing ring locking member 14 includes a second sealing ring locking member body and an abutment portion, the abutment portion is located inside the second sealing ring locking member body, the abutment portion and the second sealing ring locking member body have a spacing, the abutment portion is connected to the proximal end of the second sealing ring locking member body, and a groove structure is formed between the abutment portion and the second sealing ring locking member body; the inner side wall of the second sealing ring locking member body is threadedly connected to the proximal outer side wall of the first sealing ring locking member 13, the abutment portion extends into the first cavity and corresponds to the step, and the abutment portion abuts against the sealing ring 12.

[0068] In this embodiment, when the first sealing ring locking member 13 is connected to the second sealing ring locking member 14, the first sealing ring locking member 13 can be connected to the groove structure of the second sealing ring locking member 14. In this embodiment, the second sealing ring locking member 14 is divided into a second sealing ring locking member body and an abutting portion, so that it can abut with the sealing ring 12 through the abutting portion, and the first sealing ring locking member 13 and the second sealing ring locking member 14 can be connected, and the abutting position between the abutting portion and the sealing ring 12 can be sealed by the sealing ring, which can prevent liquid from leaking from this position.

[0069] In some embodiments, a first groove is provided on the step platform, a second groove is provided on the end surface of the abutting portion, the first groove and the second groove are arranged opposite to each other, and a first clamping groove is formed between the first groove and the second groove, and a second clamping groove is formed between the step platform without a groove and the end surface of the abutting portion, and the inner diameter of the first clamping groove is greater than the inner diameter of the second clamping groove. The sealing ring 12 is arranged in a stepped shape, and the sealing ring 12 is positioned inside the first clamping groove and the second clamping groove. In this embodiment, due to the addition of the first clamping groove, the sealing ring 12 can be firmly clamped while the sealing performance between the sealing ring and the abutting portion can be enhanced.

[0070] In some embodiments, the drive assembly includes a rotating button 20, a transmission shaft 19, and a sealing ring locking member pusher 18. The transmission shaft 19 is coaxially connected to the rotating button 20. The sealing ring locking member pusher 18 is coaxially connected to the transmission shaft 19 and meshes with the outer side wall of the second sealing ring locking member 14. The drive system includes a motor 1, and the motor 1 has a motor shaft. The motor 1 is positioned on the housing through a first motor fixing member 2 and a second motor fixing member 3, and the first motor fixing member 2 and the second motor fixing member 3 are arranged opposite to each other and a motor containing cavity is formed therebetween.

[0071] In this embodiment, the operating principle of the driving assembly is as follows: the rotating button 20 is rotated, the rotating button 20 drives the transmission shaft 19 to rotate, and then drives the sealing ring locking member pushing member 18 to rotate, and the sealing ring locking member pushing member 18 drives the second sealing ring locking member 14 meshed with the gear to rotate, and because the second sealing ring locking member 14 and the first sealing ring locking member 13 are threadedly matched, the second sealing ring locking member 14 can move in a direction close to or away from the first sealing ring locking member 13 when rotating. The moving direction of the second sealing ring locking member 14 is different when the rotating button 20 is rotated in different directions. When the second sealing ring locking member 14 moves close to the first sealing ring locking member 13, the second sealing ring locking member 14 and the first sealing ring locking member 13 will squeeze the sealing ring. When the second sealing ring locking member 14 moves away from the first sealing ring locking member 13, the distance between the second sealing ring locking member 14 and the first sealing ring locking member 13 increases, and the sealing ring returns to its original state under the action of its own elastic force. In this embodiment, the distance between the second sealing ring locking member 14 and the first sealing ring locking member 13 can be very conveniently controlled by rotating the rotary button 20 located outside the housing, thereby very conveniently controlling the degree of extrusion of the sealing ring.

[0072] In some embodiments, a fixed cylinder 25 is positioned on the housing, the distal end of the fixed cylinder 25 extends into the first cavity and is sealed with the abutment portion by an O-ring 21, and the second cavity is opened inside the fixed cylinder 25. The bearing 17 of the spiral member 11 is rotatably connected to the fixed cylinder 25. More specifically, a sealing ring groove is opened on the abutment portion, and the O-ring 21 is arranged in the sealing ring groove. The abutment portion and the distal end of the fixed cylinder 25 are slidably sealed, that is, the abutment portion can slide axially along the distal end of the fixed cylinder 25.

[0073] In some embodiments, the output shaft of the drive system includes a screw 11, a steel shaft 6 and a flexible shaft 7. The screw 11 is connected to the motor shaft through a motor connector, and the motor connector includes a first motor connector 15 and a second motor connector 16, and the first motor connector 15 is connected to the motor shaft. A limit block 10 is provided inside the housing, and the second motor connector 16 moves through the limit block 10.

[0074] The steel shaft 6 is fixedly connected to the spiral member 11, and the steel shaft 6 passes through the second cavity and the first cavity in sequence. The flexible shaft 7 is fixedly connected to the steel shaft 6 through the connecting member 8 and is arranged in the delivery catheter 9. In this embodiment, when the motor is running, the motor shaft rotates, thereby driving the spiral member 11, the steel shaft 6 and the flexible shaft 7 to rotate, and the end of the flexible shaft 7 is connected to the blood pump, thereby driving the blood pump to operate.

[0075] More specifically, the spiral member 11 and the steel shaft 6 are connected and fixed by crimping, which can ensure the stability of the connection. The steel shaft 6 and the flexible shaft 7 are connected together with their connecting members by welding or crimping, which can ensure the stability of the connection.

[0076] In some embodiments, the spiral member 11 has a reverse thread structure, and both the proximal outer wall and the distal outer wall of the spiral member 11 are provided with threads, and the threads on the proximal outer wall of the spiral member 11 are in opposite rotation direction to the threads on the distal outer wall of the spiral member 11. The distal end of the spiral member 11 is suitable for driving the liquid in the second cavity to form a spiral vortex in the opposite direction of the motor rotation under the drive of the motor 1, and the movement direction of the spiral vortex in the second cavity points to the distal end of the control handle to seal the proximal end of the second cavity.

[0077] In this embodiment, because the proximal and distal ends of the spiral 11 have opposite screw directions, when the motor is powered on, the spiral 11 rotates at high speed to form a sealing structure with the inner cavity of the handle. When the infusion device feeds liquid to the front end of the delivery catheter and the motor end through the infusion line 22, the first cavity and the second cavity, the distal end of the spiral 11 is similar to a "propeller", and the liquid in the spiral 11 will form a spiral shape, and because it is opposite to the rotation direction of the motor, the rotation of the spiral 11 generates a force pointing to the distal end of the control handle on the liquid. When the force of the liquid flowing to the proximal end of the handle is less than the force of the liquid flowing to the distal end of the control handle, that is, the force provided by the spiral is greater than the pressure given by the infusion system, at this time, the speed of the motor is greater than a certain set value, and the liquid will have a reflux phenomenon (that is, the liquid will move to the distal end of the handle), relying on the spiral action to drive the liquid medium back, so that the liquid will not leak, and then the port of the second cavity is blocked. This embodiment adopts the method of motor-driven spiral, which can ensure the sealing of the second cavity while not affecting the rotation of the steel shaft 6 and the soft shaft 7 driven by the spiral.

[0078] In some embodiments, a control system is provided on the housing, and the control system is used to control the start and stop and the speed of the drive system, that is, the controlled end of the motor is connected to the output end of the control system. The control system is a circuit board connected to an aviation plug and accompanying cables. A control button is provided on the control system, and the control button can be divided into a start button and a speed control button. In this embodiment, the control handle body serves as an intermediate connector connecting the control system to the blood pump. The start and stop of the motor can be controlled by the control button on the control system, and the speed of the motor can be adjusted by the control button on the control system, thereby controlling the amount of blood drawn by the blood pump.

[0079] In some embodiments, the housing is a split housing, and the housing is formed by snapping and splicing a number of housing units, so that disassembly and installation are more convenient. More specifically, this embodiment is formed by snapping and splicing four housing units, and the four housing units are respectively a first housing unit 4, a second housing unit 5, a third housing unit 23, and a fourth housing unit 24, wherein the first housing unit 4 is the upper housing of the rear housing of the handle, the second housing unit 5 is the upper housing of the front housing of the handle, the third housing unit 23 is the lower housing of the rear housing of the handle, and the fourth housing unit 24 is the lower housing of the front housing of the handle. The first housing unit 4 and the second housing unit 5 are snap-connected and constitute the first housing, the third housing unit 23 and the fourth housing unit 24 are snap-connected and constitute the second housing, and the first housing and the second housing are snap-fitted together.

[0080] This embodiment also discloses a method for using the control handle, which includes the following steps:

[0081] S1. During the surgical operation, before operating the device, hold the control handle and rotate the rotary button 20 to drive the sealing ring locking member pusher 18 to rotate, further drive the second sealing ring locking member 14 to rotate, and achieve static sealing through the silicone sealing ring.

[0082] S2. Inject liquid into the control handle to prevent blood reflux. The liquid contains anticoagulants to complete the blood pump interventional cardiac surgery.

[0083] S3. Put the control handle in the designated position, start the control device to start the motor, the motor drives the spiral member 11 to rotate at high speed, the spiral member 11 drives the liquid to move to the far end of the control handle, and the second cavity is sealed by the spiral seal.

[0084] S4. Rotate the rotary button 20 in the reverse direction, thereby driving the second sealing ring locking member 14 to move toward the first sealing ring locking member 13 to loosen the silicone sealing ring.

[0085] S5. After the entire surgical procedure is completed, the rotary button 20 is first turned to tighten the silicone seal ring, and then the motor is stopped to seal the evacuation device. Because in this step, if the motor is stopped first, the proximal end of the second cavity is no longer sealed, and the liquid will flow along the proximal opening of the second cavity into the cavity of the motor, causing bleeding and damaging the motor and other components.

[0086] Example 2

[0087] This embodiment discloses a left ventricular assist device, including a blood pump system and the control handle of embodiment 1.

[0088] The blood pump system is used to pump blood from the left ventricle to the aorta. The distal rotor, the mesh rotor cage and the polyurethane balloon structure constitute the distal pump structure (i.e., the blood pump system). The mesh rotor cage prevents the rotor from sucking the wall and damaging the rotor structure when the rotor rotates at high speed, and the balloon structure serves as a blood transmission channel to pump blood from the left ventricle to the aorta.

[0089] The delivery catheter 9 of the control handle is communicated with the blood pump system, and the output shaft of the drive system is connected with the blood pump system.

[0090] In the above-mentioned left ventricular assist device, the motor shaft end is connected to the spiral member 11, and the two ends of the spiral member 11 have reverse thread structures, wherein the thread at one end is connected to the second motor connector 16, and the thread at the other end forms a spiral sealing structure with the internal structure of the handle. A steel shaft 6 is embedded in the distal end of the spiral member 11, and a sealing ring 12 is embedded in the internal structure of the handle and passes through the steel shaft 6. The right side of the sealing ring 12 is connected to the first sealing ring locking member 13, and the steel shaft 6 is connected to the soft shaft 7 through the connecting member 8. The outside of the soft shaft 7 is a delivery catheter 9, which is glued to the sealing ring locking structure by glue.

[0091] Obviously, the above embodiments are merely examples for clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from them are still within the protection scope of the invention.

Claims

1. A control handle, characterized in that: include: case; A delivery catheter (9), wherein the distal end of the delivery catheter (9) is connected to the blood pump system, and the proximal end of the delivery catheter (9) is arranged inside the shell and is connected to the first cavity and the second cavity in sequence; A drive system is arranged inside the housing, wherein an output shaft of the drive system sequentially passes through the second cavity, the first cavity, and the delivery catheter (9) and is connected to the blood pump system, and the drive system is used to drive the blood pump system to operate; an infusion system, connected to the delivery conduit (9), for providing cooling liquid to the drive system; A first sealing structure, used to control whether the first cavity is sealed; A second sealing structure is arranged in the second cavity and is used to seal the second cavity; the first sealing structure and the second sealing structure switch the working state based on the running state of the drive system; before the drive system is started and / or stopped, the first sealing structure seals the first cavity; after the drive system is started, the first sealing structure no longer seals the first cavity, and the second sealing structure seals the second cavity, so as to avoid the wear and failure of the sealing ring of the first sealing structure; The proximal end of the delivery catheter (9) is connected to a first sealing ring locking member (13), and the first cavity is arranged inside the first sealing ring locking member (13); The first sealing structure comprises: A second sealing ring locking member (14) connected to the proximal end of the first sealing ring locking member (13) and capable of moving relative to the first sealing ring locking member (13); A sealing ring (12) is arranged between the second sealing ring locking member (14) and the first sealing ring locking member (13), and the sealing ring (12) is located on the periphery of the output shaft of the drive system; the sealing ring (12) is suitable for being squeezed and deformed and wrapping the output shaft of the drive system when the second sealing ring locking member (14) moves relative to the first sealing ring locking member (13), so as to seal the first cavity; A driving assembly, used for driving the second sealing ring locking member (14) to move relative to the first sealing ring locking member (13); The drive system comprises a motor (1), wherein the motor (1) has a motor shaft; The output shaft of the driving system comprises a spiral member (11), a steel shaft (6) and a flexible shaft (7); the spiral member (11) is connected to the motor shaft via a motor connector; the steel shaft (6) is fixedly connected to the spiral member (11); the steel shaft (6) passes through the second cavity and the first cavity in sequence; the flexible shaft (7) is fixedly connected to the steel shaft (6) and is arranged in the delivery conduit (9); The spiral component (11) has a reverse thread structure, and the proximal outer wall and the distal outer wall of the spiral component (11) are both provided with threads, and the threads on the proximal outer wall of the spiral component (11) are in opposite rotation direction to the threads on the distal outer wall of the spiral component (11); the distal end of the spiral component (11) is suitable for driving the liquid in the second cavity to form a spiral vortex in the opposite direction to the rotation direction of the motor under the drive of the motor (1), and the spiral vortex constitutes a second sealing structure. The moving direction of the spiral vortex in the second cavity points to the distal end of the control handle, and the force of the spiral vortex flowing toward the distal end of the handle is greater than the force of the liquid in the second cavity flowing toward the proximal end of the handle, so as to seal the proximal end of the second cavity.

2. The control handle according to claim 1, characterized in that: The first sealing ring locking member (13) is provided with a first through hole and a second through hole inside, the inner diameter of the second through hole is larger than the inner diameter of the first through hole, and a step is formed between the first through hole and the second through hole; The second sealing ring locking member (14) includes a second sealing ring locking member body and an abutment portion, wherein the abutment portion is located inside the second sealing ring locking member body and has a spacing with the second sealing ring locking member body, and the abutment portion is connected to the proximal end of the second sealing ring locking member body; the inner side wall of the second sealing ring locking member body is threadedly connected to the proximal outer side wall of the first sealing ring locking member (13), the abutment portion extends into the first cavity and corresponds to the step, and the abutment portion abuts against the sealing ring (12).

3. The control handle according to claim 1, characterized in that: The drive assembly comprises: Rotate button (20); A transmission shaft (19) is coaxially connected to the rotating button (20); The sealing ring locking member pushing member (18) is coaxially connected to the transmission shaft (19) and is meshed with the outer side wall of the second sealing ring locking member (14).

4. The control handle according to any one of claims 1 to 3, characterized in that: The housing is provided with a control system for controlling the start and stop and the rotation speed of the drive system, and the control system is provided with a control button.

5. The control handle according to any one of claims 1 to 3, characterized in that: The housing is a split housing, and the housing is formed by snap-jointing a number of housing units.

6. A left ventricular assist device, characterized in that include: a blood pump system that pumps blood from the left ventricle into the aorta; The control handle according to any one of claims 1 to 5, wherein the delivery catheter (9) of the control handle is connected to the blood pump system, and the output shaft of the drive system is connected to the blood pump system.

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