A delivery device for an implantable medical device

Abstract

The application provides a delivery device for implantable interventional medical instruments, and belongs to the technical field of medical instruments, and specifically comprises a handle, an outer sheath, a middle layer tube and a sheath core connected with the handle; the outer sheath and the sheath core have a loading space for loading a stent; the handle is provided with a loading release channel, and the wall of the middle layer tube is provided with a guide channel for connecting the loading space and the loading release channel. A release member and a loading member extend from the loading release channel to the loading space through the guide channel, and extend out of the loading space; a surgeon makes the implantable interventional medical instrument contract into the outer sheath through the loading member, and moves to the loading space; when releasing, the release member is withdrawn along the guide channel by operation; the release member and the loading member are arranged in separate guide channels, so that the resistance during loading and releasing is reduced, and the release member and the loading member are not arranged directly between the outer sheath and the middle layer tube, so that the phenomenon of winding and twisting wires is avoided.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and more specifically, to a delivery device for an interventional medical device. Background Technology

[0002] Implantable interventional therapy is a new technology that has been applied in clinical practice in recent years. It involves pre-loading an implantable medical device into a delivery device, then introducing it into the human body, and releasing the medical device to the lesion site under the monitoring of fluoroscopic equipment to achieve the therapeutic purpose. For example, in the treatment of peripheral vascular disease, a stent is delivered through a delivery device and placed into the lesion, and then the stent is expanded or self-expanded to support the blood vessel wall to restore the patency of the blood vessel.

[0003] For implantable medical devices that require pre-loading onto a delivery system, during loading, the device is first secured to the sheath core via a release mechanism to position the device axially. The distal end of the release mechanism extends from the outer sheath to the delivery system's handle. The loading component is inserted into the outer sheath and connected to the device. By pulling the loading component backward, the device, release mechanism, and sheath core are loaded as a whole into the outer sheath, where the support is compressed under its radial constraint. During release, the outer sheath is retracted, and the release mechanism on the handle is operated to release the constraint on the device.

[0004] Therefore, it is evident that during loading, the loading component needs to move within the outer sheath, and during release, the release component also needs to move within the outer sheath. The space available for movement of the stent and release component within the outer sheath is limited by the outer contour of the sheath. The smaller the outer contour, the smaller the space, the less the instrument is compressed, and the greater the frictional resistance between the instrument and the outer sheath. Similarly, a smaller space results in greater resistance between the loading component and the outer sheath during loading, and greater resistance between the release component and the outer sheath during release, making both stent loading and release more difficult. Furthermore, with multiple release components, tangling and twisting can easily occur between them, leading to release failure. Utility Model Content

[0005] The purpose of this application is to provide a delivery device for implantable medical devices, which aims to solve the problems of high resistance, difficulty in loading and releasing, and easy tangling of wires when the delivery device is used to load and release implantable medical devices in the related art.

[0006] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description or may be learned by practice of this application.

[0007] According to a first aspect of this application, a delivery device for an implantable medical device is provided, comprising:

[0008] The handle, and the outer sheath, middle tube, and sheath core connected to the handle;

[0009] The middle layer tube is sleeved outside the sheath core, and the outer sheath tube is sleeved outside the middle layer tube. There is a loading space between the outer sheath tube and the sheath core for loading implantable medical devices.

[0010] The handle is provided with a loading and release channel, and the middle tube is provided with a guide channel. Both the guide channel and the loading and release channel are used for the release component and the loading component to pass through. The loading space and the loading and release channel are connected through the guide channel.

[0011] In one exemplary embodiment of this application, the guide channel includes a groove disposed on the sidewall of the middle layer tube.

[0012] In one exemplary embodiment of this application, the guide channel includes a groove disposed on the inner sidewall of the middle layer tube.

[0013] In one exemplary embodiment of this application, the guide channel includes a through hole disposed within the wall of the middle layer tube.

[0014] In one exemplary embodiment of this application, the contour of the guide channel is adapted to the outer contour of the corresponding release member and loading member to constrain the circumferential position of the release member and loading member within the guide channel.

[0015] In one exemplary embodiment of this application, the guide channels are configured as two or more, and the two or more guide channels are distributed at circumferential intervals along the middle layer tube;

[0016] At least one of the guide channels is used for the passage of the loading component, and the remaining guide channels are used for the passage of the releasing component.

[0017] In one exemplary embodiment of this application, two or more of the guide channels are arranged symmetrically.

[0018] In one exemplary embodiment of this application, a sleeve is further included, which is embedded in the guide channel and is used to guide the release member and the loading member through.

[0019] In one exemplary embodiment of this application, the length of the sleeve is adapted to the length of the guide channel.

[0020] In one exemplary embodiment of this application, the sleeve is provided in multiple locations, and the multiple sleeves are distributed at intervals within the guide channel.

[0021] In one exemplary embodiment of this application, at least one of the plurality of sleeves is located at one end of the guide channel near the loading space, and at least one of the plurality of sleeves is located at one end of the guide channel near the loading release channel.

[0022] The exemplary embodiments of this application may have some or all of the following beneficial effects:

[0023] The delivery device for the implantable medical device provided in the example embodiment of this application includes a handle and an outer sheath, a middle layer, and a sheath core connected to the handle. The middle layer is sleeved over the sheath core, and the outer sheath is sleeved over the middle layer. A loading space for loading the implantable medical device is provided between the outer sheath and the sheath core. A loading release channel is provided on the handle, and a guide channel is provided on the middle layer. Both the guide channel and the loading release channel are used for the passage of the release element and the loading element. The loading space and the loading release channel are connected through the guide channel. The distal end of the release element can constrain the implantable medical device onto the sheath core. During loading, the loading element extends from the loading release channel through the guide channel to the loading space and protrudes from the loading space. The distal end of the loading element connects to the implantable medical device. By pulling the loading element, the implantable medical device and the sheath core can be pulled together into the outer sheath, causing the implantable medical device to retract into the outer sheath to facilitate subsequent interventional surgery. During the release process, the operator first removes the implantable medical device from the outer sheath, and then operates the release device from the handle to release the release device from the constraint of the implantable medical device.

[0024] On the one hand, by setting the guide channel on the middle tube, sufficient movement space can still be provided for the release component and the loading component even when the outer contour size of the outer sheath tube is small. This can reduce the friction force on the loading component during the movement of the loading component, thereby reducing the loading resistance. It can also reduce the friction force on the release component during the movement of the release component, thereby reducing the release resistance.

[0025] On the other hand, by setting the guide channel on the middle tube, both the release component and the loading component can move through the guide channel without having to bend significantly into the gap between the middle tube and the outer sheath tube. This reduces or avoids the resistance caused by the end of the middle tube to the release component and the loading component during movement, further reducing the resistance to loading and releasing and improving the smoothness of movement of the loading component and the release component.

[0026] On the other hand, the guide channel can constrain the circumferential position of the release component. When multiple release components are arranged, it can avoid the problem of entanglement between the release components, which would increase the pulling resistance of the release components or even prevent them from being pulled. At the same time, the release component and the loading component can move in different channels, which can also avoid interference between the release component and the loading component during the loading process.

[0027] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0028] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0029] Figure 1 A schematic diagram of the delivery device for an implantable medical device according to an embodiment of this application is shown;

[0030] Figure 2 This paper shows a schematic diagram of the delivery tube of the implantable medical device in an embodiment of this application;

[0031] Figure 3 This illustration shows a schematic diagram of the delivery device of the implantable medical device in an embodiment of this application without a cannula.

[0032] Figure 4 This invention provides a schematic diagram of the delivery system of an implantable medical device with two cannulas in an embodiment of this application.

[0033] Figure 5 A cross-sectional view of a guide channel provided on the inner wall of the middle layer tube in an embodiment of this application is shown;

[0034] Figure 6 A cross-sectional view showing two guide channels formed on the inner wall of the middle layer tube in an embodiment of this application is shown;

[0035] Figure 7 A cross-sectional view of a middle-layer tube with multiple guide channels on its inner wall is shown in an embodiment of this application.

[0036] Figure 8 A cross-sectional view of a guide channel provided on the outer wall of the middle layer tube in an embodiment of this application is shown;

[0037] Figure 9 A cross-sectional view showing two guide channels formed on the outer wall of the middle layer tube in an embodiment of this application is shown;

[0038] Figure 10 A cross-sectional view showing that the outer wall of the middle layer tube in an embodiment of this application has multiple guide channels is shown;

[0039] Figure 11 A cross-sectional view of a guide channel formed inside the wall of the middle layer tube in an embodiment of this application is shown;

[0040] Figure 12 A cross-sectional view of two guide channels formed inside the wall of the middle layer tube in an embodiment of this application is shown;

[0041] Figure 13 A cross-sectional view of a middle-layer tube with multiple guide channels inside the wall in an embodiment of this application is shown;

[0042] Explanation of reference numerals in the attached figures:

[0043] 100, Middle tube; 1001, Guide channel; 200, Sheath core; 300, Sleeve; 400, Release element; 500, Outer sheath; 600, Handle; 700, Outer sheath retraction mechanism. Detailed Implementation

[0044] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed descriptions will be omitted. Furthermore, the drawings are merely illustrative of this application and are not necessarily drawn to scale.

[0045] Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of an icon to another, these terms are used only for convenience, such as according to the orientation of the examples in the accompanying drawings. It is understood that if the device of the icon is flipped so that it is upside down, the component described as "upper" will become the component described as "lower." When a structure is "upper" of another structure, it may mean that the structure is integrally formed on the other structure, or that the structure is "directly" mounted on the other structure, or that the structure is "indirectly" mounted on the other structure through another structure.

[0046] The terms “a,” “one,” “the,” and “at least one” are used to indicate the existence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended inclusion and to mean that there may be other elements / components / etc. in addition to the listed elements / components / etc.; the terms “first” and “second” are used only as markers and are not a limitation on the number of objects. Example

[0047] This embodiment provides a specific implementation of a delivery device for implantable medical devices, such as... Figure 1 and Figure 2As shown, the device includes a handle 600 and an outer sheath 500, a middle layer tube 100, and a sheath core 200 connected to the handle 600. The middle layer tube 100 is sleeved outside the sheath core 200, and the outer sheath 500 is sleeved outside the middle layer tube 100. There is a loading space between the outer sheath 500 and the sheath core 200 for loading an implantable medical device. The handle 600 is provided with a loading and release channel, and the middle layer tube 100 is provided with a guide channel 1001. Both the guide channel 1001 and the loading and release channel are used for the release component 400 and the loading component to pass through. The loading space and the loading and release channel are connected through the guide channel 1001. Before performing the interventional procedure, the interventional medical device needs to be pre-installed in the loading space. Then, the outer sheath 500, middle tube 100, and sheath core 200 containing the interventional medical device are delivered to the lesion site. The interventional medical device is then released at the lesion site. When the interventional medical device is installed in the loading space, the distal end of the release component 400 passes through the loading release channel, guide channel 1001, and loading space to constrain the interventional medical device on the sheath core 200. The loading component pulls the interventional medical device into the outer sheath 500, and the interventional medical device retracts into the loading space between the outer sheath 500 and the sheath core 200.

[0048] In this embodiment, by providing a guide channel 1001 on the middle tube 100, the release member 400 and the loading member can move within the guide channel 1001. Even if the outer contour dimension of the outer sheath tube 500 is small, the release member 400 and the loading member have independent movement space, avoiding the problem of easy entanglement and twisting of the release member 400 and the loading member when they are located in the gap between the middle tube 100 and the outer sheath tube 500.

[0049] When a larger outer sheath 500 cannot be used for surgery, such as in the TIPS procedure, where only a 10Fr outer sheath 500 can pass through, a guide channel 1001 is opened on the middle tube 100 to provide space for the release element 400 and the loading element to move. This reduces loading and release resistance without increasing the size of the outer sheath 500.

[0050] Specifically, the implantable medical device mentioned in this embodiment can be a stent or a balloon; the release element 400 can be a wire or rod, such as an elastic metal wire, which can be made of nickel-titanium alloy or stainless steel; the loading element can be a filamentous drawstring made of metal or polymer material, and the distal end of the drawstring can pass through the stent and then return through the guide channel 1001. Of course, the drawstring can also be inserted through the guide channel and return through the gap between the middle layer tube and the outer sheath tube 500 after passing through the stent.

[0051] Furthermore, in related technologies, the release element 400 is disposed in the gap between the middle tube 100 and the outer sheath tube 500. At the distal end of the middle tube 100, due to the wall thickness of the middle tube 100, the release element 400 needs to bend to conform to the surface of the sheath core 200. When the release element 400 moves, it bends at the end of the middle tube 100 and rubs against the end face of the middle tube 100, increasing the moving resistance of the release element 400. Similarly, the loading element also has corresponding problems.

[0052] Therefore, by providing a guide channel 1001 inside the wall of the middle tube 100, whether the guide channel 1001 is located inside the wall of the middle tube 100 or opened on the inner wall of the middle tube 100, the distance between the release member 400, the loading member and the sheath core 200 will be reduced, the degree of bending of the release member 400 at the end of the middle tube 100 will be reduced, the friction between the release member 400 and the end face of the middle tube 100 will be reduced, and thus the loading resistance will be reduced.

[0053] Furthermore, the circumferential position of the release element 400 and the loading element can be constrained by the guide channel 1001. When multiple release elements 400 and multiple guide channels 1001 are arranged, the multiple release elements 400 are arranged circumferentially one by one in the guide channel. Through the constraint of the guide channel 1001, the problem of entanglement between the release elements 400 can be avoided, which would lead to increased pulling resistance or even inability to pull the release elements 400.

[0054] Furthermore, regarding the loading component, taking the loading component as a pull cable as an example, after connecting to the bracket, the loading component needs to return to the handle 600. Therefore, it is necessary to construct an entry channel and a return channel for the loading component. When there are enough guide channels 1001, one guide channel 1001 can be used as the entry channel, another guide channel 1001 as the return channel, and the remaining guide channels 1001 as channels for the release component 400. At this time, by constraining the circumferential positions of different release components through different guide channels 1001, the circumferential positions of the two parts of the loading component are also constrained, which can prevent entanglement between release components 400, between release components 400 and the loading component, and between the two parts of the loading component.

[0055] To facilitate the retraction of the outer sheath 500 relative to the handle 600, the conveyor also includes an outer sheath retraction mechanism 700 disposed within the handle 600 and movable along the axial direction of the handle 600. The outer sheath retraction mechanism 700 is connected to the outer sheath 500, and the outer sheath 500 is retracted relative to the handle 600 through the outer sheath retraction mechanism 700.

[0056] In one embodiment, the outer sheath retraction mechanism 700 includes a slider or other sliding element. A slide rail or chamber corresponding to the slider is provided within the handle 600, allowing the slider to slide back and forth along the axial direction of the handle 600 within the handle 600. The slider is connected to the proximal end of the outer sheath 500, and the outer sheath 500 is slidably connected to the handle 600. A portion of the slider may be exposed outside the handle 600 for ease of operation; alternatively, an operating lever or similar component connected to the slider may be additionally provided on the handle 600.

[0057] In one embodiment, the guide channel 1001 includes a groove on the inner wall of the middle layer tube 100. The groove extends axially along the middle layer tube 100, connecting the loading space with the loading release channel. This allows the release member 400 to be confined within the groove, enabling it to move within the groove to pull the support and release the support. Furthermore, by creating the groove on the inner wall of the middle layer tube 100 as the guide channel 1001, the release member 400, which is attached to the sheath core 200, will not be excessively bent when entering the guide channel 1001, resulting in smoother movement of the release member 400.

[0058] In other embodiments, the guide channel 1001 includes a groove on the outer wall of the middle layer tube 100, the groove extending axially along the middle layer tube 100, communicating with the loading space and the loading release channel, which can satisfy the requirement to confine the release member 400 within the groove, allowing the release member 400 to move within the groove to pull the bracket and release the bracket. Figure 8 , Figure 9 and Figure 10 As shown, the grooves on the outer wall can be one, two, four, etc. The illustrations in this application are for illustrative purposes only, and the grooves on the outer wall can also be in other quantities and arrangements.

[0059] In some other embodiments, such as Figure 11 , Figure 12 and Figure 13 As shown, the guide channel 1001 can also be a through hole provided in the wall of the middle tube 100, extending axially along the middle tube 100, as long as it can connect the loading and releasing channel with the loading space. However, in this embodiment, the release member 400 attached to the sheath core 200 will still bend slightly when entering the guide channel 1001, resulting in additional resistance during movement; the same applies to the loading member. Furthermore, opening a hole in the wall of the middle tube 100 is more difficult to process than opening a groove in the wall. Therefore, in this invention, it is preferable to open a groove on the inner wall of the middle tube 100 as the guide channel 1001.

[0060] In the above embodiments, when the guide channel 1001 is set as a through hole in the wall of the middle layer tube 100, the wall thickness of the middle layer tube 100 needs to meet the requirements of the opening, and the thickness on both sides of the hole needs to meet the standard. For example, if the thinnest part of the wall thickness of the middle layer tube 100 needs to be 0.2mm, then the thickness on both sides of the hole needs to reach 0.2mm, and the overall diameter of the middle layer tube 100 will be larger. However, when the guide channel 1001 is set on the inner or outer wall of the middle layer tube 100, only the thickness on one side of the guide channel 1001 needs to meet the standard, and the wall thickness requirement of the middle layer tube 100 is lower. This can reduce the overall outer diameter of the middle layer tube 100 and meet the needs of smaller-sized interventions.

[0061] Furthermore, when the guide channel 1001 is located on the outer wall of the middle tube 100, since the outer sheath 500 is also sleeved on the outside of the middle tube 100, the release member 400 will be located between the outer sheath 500 and the middle tube 100. When the outer sheath 500 or the release member 400 is retracted, friction will occur between the outer sheath 500 and the release member 400, affecting the retraction operation. Therefore, in this invention, it is preferable to locate the guide channel 1001 on the inner wall of the middle tube 100.

[0062] In this embodiment, the contour of the guide channel 1001 is adapted to the outer contour of the corresponding release member 400 and the loading member, so as to constrain the circumferential position of the release member 400 and the loading member in the guide channel 1001. This can, to a certain extent, avoid the problem of the release member 400 and the loading member being squeezed out of the guide channel 1001 and entering between the inner wall of the middle tube 100 and the sheath core 200 during the movement of the release member 400 and the loading member, which would lead to an increase in movement resistance.

[0063] Additionally, it should be noted that when the outline of the guide channel 1001 matches the outer outline of the corresponding release member 400 and loading member, at least two guide channels 1001 need to be provided on the middle layer tube 100, one guide channel 1001 for the release member 400 channel and the other guide channel 1001 for the loading member channel.

[0064] Specifically, taking the circular cross-section of the release element 400 as an example, the cross-section of the guide channel 1001 can be set as a semi-circle, a 3 / 4 circle, or a U-shape, etc., and no restrictions are placed on it in this embodiment.

[0065] When the contour of the guide channel 1001 does not match the outer contours of the corresponding release member 400 and the loading member, a guide channel 1001 can be provided on the intermediate tube 100. When the wall thickness of the intermediate tube 100 is limited, the guide channel 1001 can be an arc-shaped groove, thus accommodating both the release member 400 and the loading member simultaneously. To avoid interference between the loading member and the release member 400, it is preferable to provide at least two guide channels 1001 on the intermediate tube 100.

[0066] In one embodiment, the guide channels 1001 are configured as two or more, and the two or more guide channels 1001 are distributed at circumferential intervals along the middle layer tube 100.

[0067] When there are two guide channels 1001, the release component 400 and the loading component can be set in different guide channels 1001 for movement. At this time, the far end of the loading component passes through the bracket and then returns along the original path. That is, the two loading components are located in the same guide channel 1001, and the loading component and the release component 400 do not interfere with or affect each other.

[0068] When there are three guide channels 1001, two release members 400 and one loading member can be set. The loading member still passes through the bracket at its distal end and returns along the same path. The two release members 400 are set in different guide channels 1001, and the two release members 400 and one loading member are set in different guide channels 1001. As an alternative implementation, one release member 400 and one loading member can be set. The distal end of the loading member passes through the bracket and returns through another guide channel 1001. That is, the two loading members are located in different guide channels 1001, which can avoid phenomena such as entanglement of the loading members.

[0069] When there are 4 guide channels 1001, they can be two release components 400 and two loaders, two release components and one loader, or three release components and one loader, depending on the actual needs.

[0070] Furthermore, two or more guide channels 1001 are arranged symmetrically. Taking two guide channels 1001 as an example, for instance... Figure 6 As shown, the two guide channels 1001 are arranged vertically, so that the release component 400 and the loading component are located in independent guide channels 1001 respectively; for example, when there are four guide channels 1001, the arrangement of the four guide channels 1001 is as follows. Figure 7 As shown, the two release members 400 can be respectively positioned within two symmetrical guide channels 1001, either vertically or horizontally, resulting in more stable constraint on the bracket. Simultaneously, the loading members located within the other two symmetrical guide channels 1001 ensure even force distribution when the bracket moves towards the loading space. In other embodiments, the guide channels 1001 can be configured with three, five, six, etc., allowing for the provision of multiple release members 400 and loading members; this application does not impose any limitations on this.

[0071] In the above embodiments, as a preferred embodiment, the guide channel 1001 is a groove provided on the inner side wall of the middle layer tube 100. The groove extends along the axial direction of the middle layer tube 100, connecting the loading space with the loading release channel, and the release member 400 can be loaded into the guide channel 1001.

[0072] Because a groove is made on the inner wall of the middle tube 100, when the middle tube 100 is sleeved on the sheath core 200, the release component 400 and the loading component located in the guide channel 1001 may be squeezed into the gap between the groove and the sheath core 200 under the action of tension when they move. This may cause the release component 400 and the loading component to deviate from the guide channel 1001, or even become entangled on the sheath core 200 and twisted, affecting the movement of the release component 400 and the loading component.

[0073] Therefore, in the embodiments of this application, as Figure 2 , Figure 3 and Figure 4 As shown, the conveyor also includes a sleeve 300, which is embedded in a groove. The sleeve 300 is used to guide the release member 400 and the loading member through. Embedding the sleeve 300 in the groove ensures that the release member 400 and the loading member are always kept in the groove of the corresponding guide channel 1001, preventing the release member 400 and the loading member from being squeezed into the gap between the middle tube 100 and the outer sheath tube 500, which would affect the loading and release of the support.

[0074] In other embodiments, such as when the guide channel 1001 is a through hole opened in the wall of the middle tube 100, since the through holes are all independent and do not communicate with the gap between the middle tube 100 and the outer sheath tube 500, the sleeve 300 does not need to be installed.

[0075] In this embodiment, the length of the sleeve 300 is adapted to the length of the guide channel 1001, so that the release member 400 and the loading member can be guided by the sleeve 300 in the distance from the loading release channel to the loading space, ensuring that the movement path of the release member 400 and the loading member is along the axial direction of the middle tube 100.

[0076] In other embodiments, multiple sleeves 300 may be provided, spaced apart within the guide channel 1001, as long as they can guide the release member 400 and the loading member to extend along the axial direction of the middle tube 100. The multiple sleeves 300 are fixedly disposed within the guide channel 1001. Using multiple spaced-apart sleeves 300, compared to using a single continuous sleeve 300, reduces the amount of material used, thereby lowering production costs.

[0077] Furthermore, at least one of the multiple sleeves 300 is disposed at one end of the guide channel 1001 near the loading space, and at least one of the multiple sleeves 300 is disposed at one end of the guide channel 1001 near the loading release channel. Two sleeves 300 need to be disposed at both ends of the guide channel 1001 to guide the release member 400 and the loading member from the loading release channel and the loading space into the guide channel 1001.

[0078] In this embodiment, only two sleeves 300 can be provided, located at opposite ends of the guide channel 1001. Since the release member 400 is a relatively long member, as long as it passes through both ends of the guide channel 1001 via sleeves 300, the portion of the release member 400 located in the middle of the guide channel 1001 will also be within the guide channel 1001. Ensuring that the release member 400 passes through the sleeves 300 at both ends of the guide channel 1001 guarantees its position within the guide channel 1001. The same principle applies to the loading member.

[0079] In some other embodiments, such as Figure 5 As shown, a groove is provided on one side of the middle tube 100, and a sleeve 300 matching the length of the groove is embedded in the groove. The sleeve 300 can guide the release member 400 into the guide channel 1001, and the sleeve 300 can also keep the corresponding release member 400 and loading member in the guide channel 1001.

[0080] In some other embodiments, a groove is formed on one side of the middle tube 100, and multiple sleeves 300 can be used to cooperate with it. The multiple sleeves 300 are segmented and embedded in local positions of the groove, such as the two ends and the middle section. Of course, only two sleeves 300 can be used. The two sleeves 300 are located at the two ends of the guide channel 1001 respectively. As long as the release member 400 and the loading member are restricted to the two ends of the corresponding guide channel 1001, the middle part can also be restricted.

[0081] In some other embodiments, such as Figure 6 As shown, the inner wall of the middle layer tube 100 may also have two grooves, which may be symmetrically or asymmetrically distributed.

[0082] In some other embodiments, when two grooves are provided on the inner sidewall of the middle tube 100, it can be used in conjunction with the sleeve 300, such as the sleeve 300 whose length matches the groove, so that the release member 400 and the loading member are always restricted by the sleeve 300.

[0083] In some other embodiments, two grooves are provided on the inner sidewall of the middle layer tube 100, and multiple sleeves 300 can be selected for use together. The length of the multiple sleeves 300 can be shorter, and the multiple sleeves 300 are arranged along the length direction of the grooves and are spaced apart.

[0084] In some other embodiments, such as Figure 7As shown, the inner wall of the middle layer tube 100 has multiple grooves, such as three, four, or five. Taking four grooves as an example, the four grooves can be arranged symmetrically, and no additional sleeve 300 is provided.

[0085] In some other embodiments, the four grooves may also be arranged asymmetrically, and the sleeve 300 is not provided.

[0086] In some other embodiments, when the four grooves are arranged symmetrically, an additional sleeve 300 can be provided. The length of the sleeve 300 can be matched with the length of the groove, or multiple sleeves 300 can be arranged in the groove. There is no limitation on this.

[0087] In some other embodiments, when the four grooves are arranged asymmetrically, an additional sleeve 300 can be provided. The length of the sleeve 300 can be matched with the length of the groove, or multiple sleeves 300 can be arranged in the groove. There is no limitation on this.

[0088] The working principle of the conveyor in this utility model is as follows:

[0089] Taking an implantable medical device like a stent as an example, during loading, the release component 400 is first delivered to the distal end of the sheath core 200, constraining the stent to the distal end of the sheath core. Then, the loading component is inserted through the loading release channel, passes through the guide channel 1001 into the loading space, and extends out of the loading space to connect to the stent located outside the outer sheath tube 500. After the loading component is connected to the stent, the operator pulls the portion of the loading component extending from the loading release channel at the proximal end of the handle 600, causing the loading component to move along the axial direction of the guide channel 1001 within the loading space, guide channel 1001, and loading release channel, thus pulling the stent and sheath core 200 back into the outer sheath tube 500 until the stent is pulled into the loading space. Then, the loading component can be pulled further back to separate it from the stent.

[0090] During release, when the delivery device is moved, the stent is positioned at the lesion site. The outer sheath 500 is retracted relative to the middle tube 100 to expose the stent. The operator then uses the release device 400 to retract along the guide channel 1001 to release the stent. The released stent is then expanded to the required inner diameter to open up narrowed or blocked blood vessels or other non-vascular tissues. Finally, the outer sheath 500, middle tube 100, and sheath core 200 are withdrawn together.

[0091] During the loading and releasing of the support, a guide channel 1001 is provided on the middle tube 100 to connect the loading and releasing channel and the loading space, so that the release component 400 and the loading component can be constrained to move within the guide channel 1001. This reduces the moving resistance of the release component 400 and the loading component, and prevents the release component 400 and the loading component from getting tangled on the outside of the middle tube 100. This allows the support to be pulled into the loading space more stably and easily to complete the loading, and the release component 400 to release the support.

[0092] Other embodiments of this application will readily conceive of by those skilled in the art upon consideration of the specification and practice of the embodiments thereof. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not claimed in this application. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of this application are indicated by the appended claims.

Claims

1. A delivery device for an interventional medical device, characterized in that, include: The handle, and the outer sheath, middle tube, and sheath core connected to the handle; The middle layer tube is sleeved outside the sheath core, and the outer sheath tube is sleeved outside the middle layer tube. There is a loading space between the outer sheath tube and the sheath core for loading implantable medical devices. The handle is provided with a loading and release channel, and the middle tube is provided with a guide channel. Both the guide channel and the loading and release channel are used for the release component and the loading component to pass through. The loading space and the loading and release channel are connected through the guide channel.

2. The delivery device of claim 1, wherein the elongated body is configured to be inserted into a patient's body. The guide channel includes a groove disposed on the side wall of the middle layer tube.

3. The delivery device of claim 2, wherein the elongated body is configured to be advanced through the lumen of the catheter. The guide channel includes a groove disposed on the inner sidewall of the middle layer tube.

4. The delivery device of claim 1, wherein the elongated body is configured to be inserted into a patient's body. The guide channel includes a through hole disposed within the wall of the middle layer tube.

5. The delivery device of claim 1, wherein the elongated body is configured to be inserted into a patient's body. The contour of the guide channel is adapted to the outer contour of the corresponding release member and loading member to constrain the circumferential position of the release member and loading member within the guide channel.

6. The delivery device of claim 1, wherein the elongated body is configured to be inserted into a patient's body. The guide channels are configured as two or more, and the two or more guide channels are distributed at intervals along the circumference of the middle layer tube; At least one of the guide channels is used for the passage of the loading component, and the remaining guide channels are used for the passage of the releasing component.

7. The delivery device of claim 6, wherein the elongated body is configured to be advanced through the lumen of the catheter. Two or more of the aforementioned guide channels are arranged symmetrically.

8. The delivery device of any one of claims 1 to 7, wherein the delivery device is configured to deliver the implantable medical device to a target site in a patient's body. It also includes a sleeve embedded in the guide channel, the sleeve being used to guide the release component and the loading component through.

9. The delivery device of claim 8, wherein the elongated body is configured to be advanced through the vasculature of the patient. The length of the sleeve is adapted to the length of the guide channel.

10. The delivery device of claim 8, wherein the elongated body is configured to be advanced through the vasculature of a patient. The sleeve is configured as a plurality of sleeves, which are distributed at intervals within the guide channel.

11. The delivery device of claim 9, wherein the elongated body is configured to be advanced through the vasculature of a patient. At least one of the plurality of sleeves is located at one end of the guide channel near the loading space, and at least one of the plurality of sleeves is located at one end of the guide channel near the loading release channel.

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