CN219110550U

CN219110550U - Catheter pump

Info

Publication number: CN219110550U
Application number: CN202223025784.2U
Authority: CN
Inventors: 屠攀
Original assignee: Magassist Inc
Current assignee: Xinqing Medical Suzhou Co ltd
Priority date: 2022-11-15
Filing date: 2022-11-15
Publication date: 2023-06-02
Anticipated expiration: 2032-11-15

Abstract

A catheter pump is disclosed, comprising a catheter, a drive shaft rotatably disposed through the catheter, a collapsible pump head, a loader, and an insertion sheath for insertion of a patch in a clamped state. The loader comprises a folding pipe and a sliding piece which is sleeved outside the folding pipe in a sliding way, when the sliding piece slides far relative to the folding pipe, the radiating piece is folded from a dispersed state to a clamped state, and the pump head positioned in the radiating piece is compressed to the folded state by radial folding force.

Description

Catheter pump

Technical Field

The utility model relates to a catheter pump, and belongs to the technical field of medical appliances.

Background

In the field of interventional therapy, in order to reduce the puncture size, the interventional therapy apparatus often has a contractible and foldable property, that is, the apparatus is in a contractile and foldable state in the puncture pipeline to ensure that the maximum size of the apparatus is minimized, and after reaching a target position, an external force restraining the contractile and foldable apparatus is removed, and the apparatus is unfolded and expanded to a large-size state under the structural characteristics of the apparatus (super-elasticity of structural materials such as NITI alloy, spring shrapnel and other structures) so as to achieve the optimal therapeutic purpose.

Loading of the instruments in the expanded state into the puncture tubing often requires a loader attachment, in both CN100405981C and US9974893B2 a loader pre-loaded onto the instrument catheter is used, and loading is accomplished by pulling the catheter relative to the loader so that the instruments attached to the distal end of the catheter are radially compressed under the circumferential action of the distal port of the loader until the instruments are collapsed and folded into the loader, which is inserted into the puncture tubing. CN102958552B discloses the same way, except that the loader is long enough and the release of the instrument at the target site in the body is by removing the constraining force of the loader to achieve the expanded deployment of the instrument. While the loaders of CN100405981C and US9974893B2 are shorter and only operate during loading into the puncture line, once the instrument is loaded into the puncture line, the restraining force of the instrument is provided by the puncture line, and further the release of the instrument at the target site in the body is by removing the restraining force of the puncture line.

However, the above-mentioned solutions are all implemented by pulling the catheter connected to the instrument by the operator, so as to form an axial relative displacement between the instrument and the loader. Since the outer surfaces of the devices are often coated with polymeric materials such as sutures, PTFE membranes, which promote endothelialization or other functions. The axial displacement brings the following disadvantages: 1. the high polymer material covered on the outer surface of the instrument directly bears the axial tension in the process of shrinkage and folding, so that the surface and the jam of the instrument are easy to fall off, and the stability of the instrument film is affected; 2 pulling force is applied to the catheter connected with the instrument, so that the axial stress of the instrument is increased, and the risk of damaging the connection reliability of the catheter and the instrument exists.

While CN111032113a discloses compressing the pump head by applying a radial force through a compression tube having movable tabs that receive the pump head, the compressed pump head is passed from the compression tube into the cannula, and the compression tube is removed and butted by the cannula with the access sheath. However, the compression tube and the sleeve are separate, which results in a problem of complicated structure and operation when the pump head is pre-folded using this scheme.

Specifically, when the pump head is pre-collapsed, the pump head is pulled to move backward, the movable fins of the compressed tube gradually compress, and finally enter the cannula. The compression tube and reducer tube are then removed, the cannula is docked with the interventional sheath, the catheter is pushed forward, and the pump head is transferred from the cannula into the interventional sheath.

It follows that the compression tube pre-collapsing the pump head and the sleeve for holding the pump head in the pre-collapsed state for interfacing with the interventional sheath are two distinct and separate components, which increases the number of components and the number of operating steps.

Disclosure of Invention

The present utility model aims to provide a catheter pump which solves at least one of the above technical problems.

In order to achieve the above object, the present utility model provides a second technical scheme as follows

The catheter pump provided by the utility model comprises: a catheter, a drive shaft rotatably disposed through the catheter, a collapsible pump head, a loader, and an interventional sheath. The collapsible pump head includes a pump housing connected to a distal end of the catheter, an impeller disposed within the pump housing, the impeller being connected to a distal end of a drive shaft, a proximal end of the drive shaft being connectable to a motor to transfer rotation of the motor to the impeller. The loader comprises a folding pipe and a sliding piece which is sleeved outside the folding pipe in a sliding way, the folding pipe is provided with a pipe body part and a plurality of scattering sheets formed at the far end of the pipe body part, and the scattering sheets are in a scattering state and a clamping state; in the dispersed state, the pump head enters the space surrounded by the dispersing piece by pulling the catheter to the proximal end; the blades are radially closed from the deployed state to the clamped state by pushing the slider distally to compress the pump head to the collapsed state. The insertion sheath is used for inserting the scattered sheet in the clamped state.

The tube body and the fins are fixed, preferably integrally formed, at least in the axial direction.

Preferably, the distal end of the pump housing is provided with a protective tip. When the scattered sheets are in a clamping state, the protection tips are contained in the scattered sheets.

Preferably, the pump housing includes a cover on which the blood outlet is formed and a stent supporting the cover to be spread. When the scattered sheet is in the clamping state, the length of the folding tube along the axial direction is larger than the distance between the blood outlet and the distal end of the protecting tip.

Preferably, the sliding member and the insertion sheath are detachably and fixedly connected, and the distal end of the sliding member and the proximal end of the insertion sheath are provided with locking members detachable from each other.

Preferably, a hemostatic valve is arranged in the interventional sheath, and the distance between the distal end face of the hemostatic valve and the proximal end face of the interventional sheath is L1. When the scattered piece is in a clamping state and the protection tip and the bracket are contained in the scattered piece, the distance between the distal end face of the sliding piece and the distal end face of the scattered piece is L2; l2 is more than or equal to L1.

Preferably, the loader comprises a holder slidably sleeved outside the catheter and fixedly connected to the body portion.

Preferably, the slider has a guide lumen disposed at the distal end, the inner wall of the guide lumen tapering from the distal end to the proximal end.

Preferably, when the scattered sheet is in the clamping state, the scattered sheet forms a pre-folding channel, and the inner diameter of the pre-folding channel is smaller than or equal to the inner diameter of the interventional sheath.

The utility model has the beneficial effects that:

when the scattered sheet of the loader is in a scattered state, at least part of the pump heads in the expanded state can be accommodated in the scattered sheet to be formed in a space, the sliding piece is suitable for folding the scattered sheet from the scattered state to the clamped state when sliding distally, the pump heads in the scattered sheet are subjected to radial folding force, so that the pump heads are compressed to the folded state, the folding force on the pump heads is small, the operation of an operator is more convenient and labor-saving, and the operation efficiency is greatly improved. And because the pump head is subjected to radial folding force, but not axial folding force due to a pulling mode, the polymer material covered on the outer surface of the pump head is not easy to fall off, the stability of the covering film is ensured, the pump head is not easy to damage, the connection reliability between the catheter and the pump head is ensured, and the safety is high.

Meanwhile, compared with the prior art, the loose piece of the folding tube in the clamped state is directly in butt joint with the intervention sheath, and the loose piece is not required to be removed after the pump head folded by the loose piece is transferred into other parts. Thus, pre-collapsing the pump head and holding the pump head in the pre-collapsed state and interfacing with the interventional sheath is accomplished by one component, namely the patch. In this way, both the structure and the operating steps are simplified.

Further, the sliding piece for folding the scattered piece is detachably fixed with the intervention sheath, and after the pre-folding of the pump head is completed and the scattered piece is inserted into the intervention sheath, the sliding piece is fixed with the intervention sheath together, so that the catheter is conveniently pushed forward, and the pump head is transferred from the scattered piece into the intervention sheath. Thus, the slider has both the dual functions of folding the blade and for securing with the interventional sheath, as well as being beneficial for simplifying the component structure and the handling steps.

Drawings

Fig. 1 is a schematic perspective view of a catheter pump provided by the present utility model.

Fig. 2 is a schematic perspective view of a catheter and pump head provided by the present utility model.

Fig. 3 is another perspective view of a catheter and pump head provided by the present utility model.

Fig. 4 is a further schematic perspective view of a catheter and pump head provided by the present utility model.

Fig. 5 is a schematic perspective view of the loader sleeved outside the catheter.

Fig. 6 is a perspective view of a loader provided by the present utility model.

Fig. 7 is a schematic perspective view of a collapsible tube according to the present utility model.

Fig. 8 is a schematic perspective view of a slider provided by the present utility model.

Fig. 9 is a schematic cross-sectional view of a slider provided by the present utility model.

Fig. 10 is another perspective view of the loader sleeved outside the catheter according to the present utility model.

Fig. 11 is a schematic perspective view of a loader sleeved outside a catheter according to the present utility model.

Fig. 12 is a schematic cross-sectional view of a collapsible pump head of the present utility model.

Fig. 13 is a schematic cross-sectional view of a cartridge interfacing with an interventional sheath provided by the present utility model.

Detailed Description

The present utility model will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the utility model and structural, methodological, or functional modifications of these embodiments that may be made by one of ordinary skill in the art are included within the scope of the utility model.

The terms "proximal", "posterior" and "distal", "anterior" as used herein are relative to a clinician manipulating the catheter pump of the present embodiment. The terms "proximal", "posterior" and "anterior" refer to portions relatively closer to the clinician, and the terms "distal" and "anterior" refer to portions relatively farther from the clinician. For example, the motor is at the proximal and rear ends and the guard tip is at the distal and front ends; for another example, the proximal end of a member/assembly represents an end relatively close to the motor and the distal end represents an end relatively close to the guard tip.

The catheter pump of the present utility model defines an "axial" or "axial extension" with the extension of the drive shaft. As used herein, the term "inner", "outer" is with respect to an axially extending centerline, and is "inner" with respect to a direction closer to the centerline and "outer" with respect to a direction farther from the centerline.

It will be understood that the terms "proximal," "distal," "rear," "front," "inner," "outer," and these orientations are defined for convenience in description. However, catheter pumps may be used in many orientations and positions, and thus these terms of expressing relative positional relationships are not limiting and absolute. For example, the above definition of each direction is only for the convenience of illustrating the technical solution of the present utility model, and is not limited to the direction of the catheter pump of the present utility model in other scenarios including, but not limited to, product testing, transportation and manufacturing, etc., which may cause the inversion or position change thereof. In the present utility model, the above definitions should follow the above-mentioned explicit definitions and definitions, if they are defined otherwise.

In the present utility model, the terms "connected," "connected," and the like should be construed broadly unless otherwise specifically indicated and defined. For example, the device can be fixedly connected, detachably connected, movably connected or integrated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

The pump head of the catheter pump provided by the embodiment of the utility model can be inserted into a subject to assist the blood pumping function of the heart and reduce the heart burden. The catheter pump may act as a left ventricular assist, pumping blood in the left ventricle into the ascending aorta. It can also be used as a right ventricular assist to pump venous blood to the right ventricle. The scenario will be described below mainly with a catheter pump as left ventricular assist. It will be appreciated from the foregoing that the scope of embodiments of the utility model is not limited thereby.

Referring to fig. 1 to 5, catheter pump 100 comprises a motor 1, a catheter 2, a drive shaft (not shown) rotatably disposed through catheter 2, a collapsible pump head 3 that can be delivered through catheter 2 to the left ventricle of the subject's heart for pumping blood, and a coupler 4 connected to the proximal end of catheter 2 for releasable engagement with motor 1.

The collapsible pump head 3 comprises a pump housing 31 connected to the distal end of the catheter 2 and having a blood inlet 311 for feeding blood and a blood outlet 312 for feeding blood, and an impeller (not shown) housed within the pump housing 31, the impeller comprising a hub and blades supported on the outer wall of the hub. The drive shaft is connected at a proximal end to the motor 1 and at a distal end to the hub of the impeller to transfer the rotation of the motor 1 to the impeller. The drive shaft comprises a flexible shaft which is flexible and a hard shaft which is connected to the distal end of the flexible shaft, the flexible shaft is penetrated in the catheter 2, and the hard shaft is penetrated in the hub.

The pump housing 31 includes a support 313 made of nickel, titanium alloy in a metallic lattice and connected to the distal end of the catheter 2, and an elastic covering film 314 covering the support 313, the support 313 serving to support the deployment of the covering film 314. The front end of the covering film 314 is connected to the support 313, and the rear end is located at the rear side of the support 313. The mesh of the portion of the front end of the support 313 not covered with the covering film 314 forms the blood inlet 311. The rear end of the covering film 314 is covered outside the distal end of the catheter 2, and the blood outlet 312 is an opening formed at the rear end of the covering film 314.

The proximal and distal ends of the support 313 are connected to a proximal bearing housing (not shown) and a distal bearing housing 32, respectively, and proximal and distal bearings (not shown) are provided in the proximal and distal bearing housings 32, respectively. The proximal and distal ends of the hard shaft are respectively inserted into the proximal and distal bearings, supported by the two bearings, and the higher rigidity of the hard shaft allows the impeller to be better retained within the pump housing 31.

The coupler 4 and the motor 1 may be detachably connected by means of a lock nut or a snap-on connection provided by U59421311B 2. The motor 1 drives the driving part, a rotor is arranged in the coupler 4, the rotor comprises a rotor shaft and a driven part arranged on the rotor shaft, the proximal end of the driving shaft is connected to the rotor shaft, the driven part is coupled with the driving part to transmit the rotation power of the motor 1 when the motor is started to the driving shaft, and then the impeller is driven to rotate for pumping blood. The driven member and the driving member may be magnetically coupled, such as provided by CN103120810B or CN101820933B, i.e., the driven member and the driving member are both magnets. Alternatively, the follower and the driving member may employ an eddy current linkage (Eddy Current Coupling) as provided by CN216061675U or CN114452527a, i.e. one of the follower and the driving member is a magnet and the other is a conductor.

The distal end of the pump shell 31 is provided with a soft protecting tip 5, the soft protecting tip 5 is supported on the inner wall of the ventricle in a non-invasive or non-invasive way, the suction inlet of the pump head 3 is separated from the inner wall of the ventricle, the suction inlet of the pump head 3 is prevented from being attached to the inner wall of the ventricle due to the reaction force of blood in the working process of the pump head 3, and the effective area of pumping is ensured.

The pump head 3 is a collapsible pump having a collapsed state and an expanded state. In the insertion configuration of the pump head 3, the pump housing 31 and the impeller are in a collapsed state, and the pump head 3 is inserted into or delivered in the subject vasculature with a smaller size. In the operating configuration of the pump head 3, the pump housing 31 and impeller are in a deployed state so that the pump head 3 operates to pump blood in the left ventricle in larger sizes. By arranging the foldable pump head 3, the pump head 3 has smaller folding size and larger unfolding size, and the requirements of relieving the pain of the subject in the intervention process, being easy to intervene and providing large flow are met.

The design of the support 313 in a multi-mesh, especially diamond-shaped mesh, can realize better folding and unfolding by means of the memory property of nickel-titanium alloy. The cover 314 is made of flexible material and can be folded and unfolded. The blades of the impeller are made of flexible materials and can be bent relative to the hub. The blade tip of the blade in the collapsed configuration is proximate to the hub and the blade tip of the blade in the expanded configuration is distal to the hub. The energy storage of the blade is released after the external constraint is removed, so that the blade is unfolded.

Referring to fig. 5 to 9, the loader 6 includes a folding tube 61 and a sliding member 62 slidably sleeved outside the folding tube 61, wherein the folding tube 61 has a tube body 611 and a plurality of fins 612 connected to a distal end of the tube body 611. The fin 612 has a dispersed state in which the pump head 3 in the unfolded state is brought into the inside, and a closed state in which the pump head 3 can be compressed to the folded state.

The patch 612 is in its natural state, i.e., in a state in which it is not subject to external forces. Specifically, a heat treatment process is performed on the scattered sheet 612, or the scattered sheet 612 is made of a memory material, so that the material has prestress, and is in a scattered state when not stressed.

In the deployed state, the pump head 3 is brought into the space enclosed by the fin 612 by pulling the catheter 2 proximally. The blades 612 are radially closed from the deployed state to the clamped state by pushing the slider 62 distally to compress the pump head 3 to the collapsed state. When the fin 612 is in the clamped state, the fin 612 forms a pre-folding channel, and the inner diameter size of the pre-folding channel limits the outer diameter size of the pump head 3 in the folded state. Obviously, the inner diameter of the pre-folded channel is not greater than the diameter of the pump head 3 in the unfolded state. Equal to the outer diameter of the pump head 3 in the collapsed state. The pre-folding channel is a cavity channel with the inner diameter unchanged, and the pump head 3 is positioned in the pre-folding channel and always keeps a folding state.

When the scattered piece 612 is in a scattered state, the surrounding space formed by the scattered piece 612 gradually increases from the near end to the far end. The enclosure may surround the pump head 3 in the unfolded state, and the opening angle of the diffusion sheet 612 may allow the diffusion sheet 612 to partially contact with the pump head 3. As the slider 62 slides distally, the dispersed tabs 612 collapse and the opening angle of the tabs 612 decreases, the tabs 612 apply a radial force to the pump head 3, compressing and collapsing the pump head 3 inwardly. The folding force on the pump head 3 is small, the operation of an operator is more convenient and labor-saving, and the folding efficiency of the pump head is improved. And because the pump head 3 receives radial folding force instead of axial folding force due to a pulling mode, the coating of the pump head 3 is not easy to fall off, the stability of the coating 314 is ensured, and the connection reliability between the catheter 2 and the support of the pump head 3 is ensured.

The collapsible tube 61 is made of metal, niti or PTFE with a low friction coefficient, so that friction force of the pump head 3 during relative movement in the collapsible tube 61 is reduced, and the delivery compliance is improved.

In the prior art, since the compression tube for folding the pump head and the sleeve for keeping the pump head in the folded state are separately arranged, the folding pump head generally can only adopt a mode of fixing the sleeve and pulling the catheter backward (clinical operation is that one hand of a medical staff holds the sleeve and keeps the sleeve still, and the other hand holds the catheter and pulls the catheter backward), but cannot adopt a mode of fixing the catheter and pushing the reducer forward. The reason is that the reducer pipe is pushed forward, and in the process of forcing the compression pipe to compress and deform inwards to fold the pump head, a forward component force is inevitably applied to the fins of the reducer pipe, so that the compression pipe moves forward, and the compression pipe is separated from the sleeve. Since the pump head is finally moved into the sleeve through the compression tube in the collapsed state, the separation of the two is obviously detrimental to the transfer of the pump head in the collapsed state.

Further, the sleeve for maintaining the folded state of the pump head is generally made of a thinner material, and has weak strength. Thus, when the fixed sleeve is held, the sleeve is inevitably deformed inwards. Once the concave deformation causes the inner wall of the gripped part of the sleeve to be contacted with the outer wall of the catheter, even the close fitting can cause the back pulling movement of the catheter to be blocked. And the concave deformation is also a damage to the sleeve itself, which is unfavorable for the stability of the sleeve structure.

To solve the above-mentioned problem, in the present embodiment, the tube body 611 and the fins 612 are fixed at least in the axial direction, and the fixing manner includes, but is not limited to, bonding, welding, and the like. In a preferred embodiment, the fin 612 and the tube body 611 are integrally formed, i.e. the folding tube 61 is an integral structure, which further simplifies the structure. When it is necessary to fold the pump head 3, the sliding member 62 may be pushed forward in the case of fixing the catheter 2, or the catheter 2 may be pulled backward in the case of fixing the sliding member 62, so that the operation of folding the pump head 3 is more free and flexible.

Further, referring to fig. 5 and 6, the loader 6 further includes a retainer 63 slidably sleeved outside the catheter 2 and fixedly connected to the tube body 611, such as, but not limited to, bonding, welding, clamping, etc. The holder 63 is of a generally hollow cylindrical configuration, preferably attached to the proximal end of the tube body 611, and has an outer diameter that is larger than the outer diameter of the tube body 611 so that the holder 63 is convenient for an operator to grasp.

The operator holds the holder 63 and pushes forward, so that the folding tube 61 slides forward outside the catheter 2. The tube body 611 is prevented from being deformed inwards due to the fact that the tube body 611 is directly held to contact the outer wall of the catheter 2, so that the folding tube 61 can slide forwards outside the catheter 2 more smoothly, and the tube body 611 is prevented from being damaged due to softer. Meanwhile, the folding tube 61 has a tearing line 613 (as shown in fig. 7), which is easily broken along the tearing line if the operator directly holds the folding tube 61.

Referring to fig. 10 to 12, the operator can grasp the holder 63 to drive the folding tube 61 to slide on the catheter 2 so that the fin 612 moves close to the pump head 3 in the direction indicated by the arrow in fig. 11. When the pump head 3 in the unfolded state enters the scattered pieces 612, the operator drives the sliding member 62 to slide distally relative to the folding tube 611, so that the pump head 3 is folded smoothly.

Both the retainer 63 and the slider 62 may have a tearable line for removal after the pump head 3 has completed the intervention into the patient's vasculature.

The tabs 612 may be formed by splitting the front end portion of the tube body 611, simplifying the tab making process. The number of the scattered pieces 612 is plural, for example, 3, 4, 5 or 6, which are not listed here.

Referring to fig. 8 and 9, the slider 62 has a slide chamber 621, and a guide chamber 622 provided at a distal end and communicating with the slide chamber 621. The inner wall of the guide cavity 622 tapers from the distal end to the proximal end, i.e., the sliding cavity 621 is a channel of constant inner diameter, and the guide cavity 622 is of tapered configuration.

The inner diameter of the sliding chamber 621 is at least not larger than the outer diameter of the pump head 3 in the deployed state. In the present embodiment, the inner diameter of the sliding cavity 621 is slightly larger than the outer diameter of the tube body 611 to ensure the sliding smoothness of the sliding member 62 on the folding tube 61. The proximal end inner diameter dimension of the guide cavity 622 is equal to the inner diameter of the slide cavity 621, and the distal end inner diameter dimension is slightly larger than the inner diameter of the slide cavity 621 to increase smoothness of the gathering of the scattered pieces 612 in a scattered state.

When the slider 62 slides distally, the inner diameter gradually decreases due to the gradual contraction of the guide cavity 622, and the blades 612 slowly and gradually collapse to apply a radial collapsing force to the pump head 3, so that the pump head 3 slowly and gradually collapses.

Referring to fig. 13, when the fin 612 is folded from the open state to the closed state, the pump head 3 is compressed to the folded state. The fin 612 in the clamped state is inserted into the proximal end of the insertion sheath 7 to insert the pump head 3 in the collapsed state into the vasculature of the patient. The loose piece 612 in the clamped state is directly abutted with the intervention sheath 7, so that the folded pump head 3 does not need to be transferred into other parts and then is abutted with the intervention sheath 7, the operation is simple and time-saving, and the pump head 3 is further ensured to be not easy to damage.

The access sheath 7 contains an access channel 71 that can receive the pump head 3. The catheter 2 is pushed forward, so that the pump head 3 in the folded state is transferred from the fin 612 in the clamped state into the interventional sheath 7. A hemostatic valve 72 is provided at the proximal end within the access sheath 7 to prevent blood in the blood vessel from exiting the body through the access sheath 7.

The protective tip 5 at the distal end of the pump housing 31 is relatively soft and cannot pass through the hemostatic valve 72. When the scattered pieces 612 are in the clamped state, the protection tips 5 are accommodated in the scattered pieces 612. When the pump head 3 is transferred from the clamped scattered piece 612 to the intervention sheath 7, the distal end of the protection tip 5 is also positioned in the clamped scattered piece 612, and the distal end of the scattered piece 612 in the clamped state is inserted into the intervention sheath 7 and passes through the hemostatic valve 72, so that the flexible protection tip 5 is conveniently pushed forward, the protection tip 5 is prevented from being damaged, the protection tip 5 can smoothly cross the hemostatic valve 72, and the whole pump head 3 can smoothly complete transfer.

When the fin 612 is in the clamped state, the length of the folded tube 611 in the axial direction is longer than the distance between the blood outlet 312 and the distal end of the protection tip 5. When the catheter pump 100 is primed with exhaust, the pump head 3 and the guard tip 5 are fully housed within the collapsible tube 611. After the priming and the venting of the catheter pump 100 are completed, the blood outlet 311 to the blood outlet 312 are prevented from being exposed to air, and the air is prevented from entering the pump head 3 again through the blood outlet 311 and/or the blood outlet 312, so that the pump head 3 is prevented from being subsequently inflated to be introduced into a human body. This is critical for patient safety.

The sliding member 62 is detachably and fixedly connected with the insertion sheath 7. When the loose piece 612 in the clamped state is inserted into the proximal end of the insertion sheath 7, the sliding piece 62 and the insertion sheath 7 remain axially fixed, so that the loader 6 is prevented from being separated from the insertion sheath 7 when the pump head 3 is pushed forward, and the pump head 3 can be smoothly transferred into the insertion sheath 7 in the folded state.

The distal end of the slider 62 and the proximal end of the access sheath 7 are provided with cooperating and detachable locking means, which may be a snap or a screw thread. Thus, by rotating the slider 62, locking or unlocking with the interventional sheath 7 can be achieved.

When the fin 612 is in the clamped state and the protective tip 5 and the holder 313 are accommodated in the fin 612, the distance L2 between the distal end face of the slider 62 and the distal end face of the fin 612 is greater than or equal to the distance L1 between the distal end face of the hemostatic valve 72 and the proximal end face of the interventional sheath 7. Thus, after the sliding piece 62 and the insertion sheath 7 are in butt joint and locking at the end part, the distal end of the scattered sheet 612 passes through the hemostatic valve 72, so that the protective tip 5 and the pump head 3 can smoothly pass through the hemostatic valve 72, and the transfer from the scattered sheet 612 to the insertion sheath 7 is completed.

The inner diameter of the pre-folding channel is smaller than or equal to the inner diameter of the intervention sheath 7, so that the pump head 3 can be smoothly transferred from the pre-folding channel into the intervention sheath 7. When the distal end of the loader 6 and the access sheath 7 are docked, the pump head 3 is transferred from the pre-folded channel into the access channel 71 by pushing the catheter 2 forward. At this time, the slider 62 and the locking member of the insertion sheath 7 are locked, and the slider 62 and the insertion sheath 7 cannot be separated from each other. Thereby preventing the transfer of the pump head 3 from the pre-folded channel to the access channel 71 from being blocked by the slide 62 being moved backward to be separated from the access sheath 7 due to the reaction force of the pump head 3 when the catheter 2 is pushed forward. Finally, the loader 6 is torn off, and when the catheter pump 100 is inserted into the body of the subject to assist in pumping blood, the catheter pump 100 is kept in the state of being inserted into the body of the subject, and the insertion sheath 7 is kept in the puncture.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims

1. A catheter pump, comprising:

a conduit;

a drive shaft rotatably penetrating the guide tube;

a collapsible pump head comprising: a pump housing connected to the distal end of the catheter, an impeller disposed within the pump housing; the impeller is connected to a distal end of the drive shaft, a proximal end of the drive shaft being connected to a motor to transmit rotation of the motor to the impeller;

a cartridge, comprising: the folding pipe is provided with a pipe body part and a plurality of scattering sheets formed at the far end of the pipe body part, and the scattering sheets are in a scattered state and a clamped state; in the dispersed state, the pump head enters the space surrounded by the dispersing piece by pulling the catheter to the proximal end; radially closing the tabs from the deployed state to the clamped state by pushing the slider distally to compress the pump head to the collapsed state;

an insertion sheath for inserting the scattered sheet in the clamped state.

2. The catheter pump of claim 1, wherein the tube portion and the fins are fixed at least axially.

3. The catheter pump of claim 2, wherein the tube portion and the fin are integrally formed.

4. The catheter pump of claim 1, wherein said pump housing distal end is provided with a protective tip, said protective tip being received within a plurality of said fins when said fins are in a clamped condition.

5. The catheter pump of claim 4, wherein the pump housing comprises a cover having a blood outlet formed thereon and a stent supporting deployment of the cover; when the fin is in a clamped state, the length of the folding tube along the axial direction is larger than the distance between the blood outlet and the distal end of the protective tip.

6. The catheter pump of claim 5, wherein the slider member is removably fixedly connected to the access sheath; the distal end of the slider and the proximal end of the access sheath are provided with locking means that are detachable from each other.

7. The catheter pump of claim 6, wherein a hemostatic valve is disposed within the interventional sheath;

the distance between the distal end face of the hemostatic valve and the proximal end face of the interventional sheath is less than or equal to the distance between the distal end face of the slider and the distal end face of the fin when the fin is in the clamped state.

8. The catheter pump of claim 1, further comprising a retainer slidably disposed over the catheter and fixedly coupled to the catheter body.

9. The catheter pump of claim 1, wherein the slider member has a guide lumen disposed at the distal end, an inner wall of the guide lumen tapering from the distal end to the proximal end.

10. The catheter pump of claim 1, wherein the fin forms a pre-folded channel when the fin is in a clamped state, the pre-folded channel having an inner diameter less than or equal to an inner diameter of the access sheath.