Adjustable bend balloon microcatheter

Abstract

The utility model relates to an adjustable bending balloon microcatheter, which comprises a catheter, an instrument channel is formed in the middle of the catheter, at least one liquid channel and at least one bending channel are formed around the catheter, a balloon and a traction ring are arranged at the distal end of the catheter, the balloon is in communication with the liquid channel, a bending wire is arranged in the bending channel, and the distal end of the bending wire is connected to the traction ring; a handle assembly comprises a handle rod and a bending knob, the bending knob rotates on the handle rod, the rear end of the catheter longitudinally penetrates through the handle rod, a liquid injection hole is formed in the front end of the handle rod, the liquid injection hole is in communication with the liquid channel of the catheter, and the bending wire penetrates out of the catheter and is connected to the bending knob. The adjustable bending balloon microcatheter can select a blood vessel through the bending channel, inflate the balloon through the liquid channel to dilate or block a narrow blood vessel, and deliver a stent or other instrument through the instrument channel for final implantation treatment.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, specifically to an adjustable bendable balloon microcatheter. Background Technology

[0002] Current balloon catheters can only treat, not deliver instruments. Ordinary microcatheters can only deliver instruments, not treat. Innovative products, such as balloon microcatheters, combine balloons and microcatheters, enabling both treatment and delivery. However, they still require guidewire guidance to select tortuous vascular branches and demand a certain level of surgical skill. Another innovative product, the bendable microcatheter, can flexibly adapt to tortuous and complex vascular anatomy, accurately reaching vascular branches that are difficult for conventional straight-tipped microcatheters to select. However, it has no therapeutic effect and still requires pre-dilation of the balloon before reaching the target location.

[0003] Currently, balloon catheters with bend adjustment function are coaxial dual-lumen catheters. See the prior patent CN218552888U - A bendable high-torque balloon microcatheter. The coaxial dual-lumen structure used in this patent consists of inner and outer tubes. Both the bend adjustment and balloon functions utilize the annular gap between the inner and outer tubes. This cannot effectively prevent contact between the bend adjustment wire and the liquid used to inflate the balloon. The handle is difficult to assemble, and under the pressure of inflating the balloon, leakage may occur near the junction of the bend adjustment wire outlet and the knob. The tube body is not a single composite material, and the separate inner and outer tubes have insufficient torque transmission when the tube body is rotated axially. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide an adjustable bendable balloon microcatheter to solve the technical problems of insufficient torque transmission when the current adjustable bendable balloon catheter rotates axially, difficulty in assembling the handle, and easy interference between the bendable wire and the liquid in the liquid channel due to sharing the annular gap.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A flexible balloon microcatheter is provided, including...

[0007] The catheter has an instrument channel in the middle, at least one liquid channel and at least one bending channel around its perimeter, a balloon and a traction ring on the catheter, the balloon is connected to the liquid channel, a bending wire is provided in the bending channel, and the front end of the bending wire is connected to the traction ring;

[0008] The handle assembly includes a handle rod and an adjustment knob. The adjustment knob rotates on the handle rod. The rear end of the conduit passes longitudinally through the handle rod. The front end of the handle rod has an injection hole that communicates with the liquid channel of the conduit. The adjustment wire passes through the conduit and connects to the adjustment knob.

[0009] Furthermore, the catheter includes an inner layer, a metal reinforcing layer, and an outer layer. The instrument channel is formed in the inner layer, and the liquid channel and the bending channel are both formed in the outer layer material inside or outside the metal reinforcing layer.

[0010] The inner layer is made of polytetrafluoroethylene, the metal reinforcing layer is a woven layer, and the outer layer is made of thermoplastic material.

[0011] Furthermore, a knob groove is provided on the handle rod, the knob groove extends through the handle rod vertically, the bending knob is set in the knob groove via a rotating shaft, and both the upper and lower ends of the bending knob extend out of the knob groove.

[0012] Furthermore, the conduit and the handle rod are sealed with glue.

[0013] Furthermore, the bending knob has a toothed rim around its perimeter.

[0014] Furthermore, the handle rod has a slider for locking the bending knob.

[0015] The beneficial effects of this utility model are:

[0016] This utility model of an adjustable-bend balloon microcatheter can bend the head of the catheter through the bendable channel, inflate the balloon through the liquid channel to dilate or block narrowed blood vessels, and deliver a stent through the instrument channel for final implantation treatment.

[0017] Secondly, the bend adjustment knob has teeth around its perimeter, enabling dual compatibility with both manual and vascular surgery robots, reducing the number of instruments and personnel required for the surgery. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the adjustable bendable balloon microcatheter of this utility model;

[0020] Figure 2 This is a partial view of the front end of the adjustable bendable balloon microcatheter of this utility model;

[0021] Figure 3 This is a partial view of the rear end of the adjustable bendable balloon microcatheter of this utility model;

[0022] Figure 4 This is a cross-sectional view of the catheter;

[0023] Among them, 1. Catheter, 11. Inner layer, 12. Metal reinforcement layer, 13. Outer layer, 14. Instrument channel;

[0024] 21. Traction ring; 22. Bending screw; 23. Bending knob; 24. Bending channel;

[0025] 31. Balloon; 32. Fluid channel;

[0026] 4. Handle rod; 41. Injection hole; 42. Slider. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] This application provides an adjustable-bend balloon microcatheter, which will be described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.

[0029] To address the technical problems of poor overall integrity of the adjustable balloon catheter body, difficulty in assembling the handle, and easy contact between the adjusting wire 22 and the liquid in the liquid channel 32 in the prior art, an embodiment of this application provides an adjustable balloon microcatheter. This is described in detail below.

[0030] like Figures 1 to 4 As shown, an adjustable-bend balloon microcatheter includes...

[0031] The catheter 1 has an instrument channel 14 in the middle, at least one liquid channel 32 and at least one bending channel 24 around the catheter 1, a balloon 31 and a traction ring 21 are provided on the catheter 1, the balloon 31 is connected to the liquid channel 32, and a bending wire 22 is provided in the bending channel 24, with the front end of the bending wire 22 connected to the traction ring 21.

[0032] The handle assembly includes a handle rod 4 and a bending knob 23. The bending knob 23 rotates on the handle rod 4. The rear end of the conduit 1 passes longitudinally through the handle rod 4. The front end of the handle rod 4 has an injection hole 41, which is connected to the liquid channel 32 of the conduit 1. The bending wire 22 passes through the conduit 1 and is connected to the bending knob 23.

[0033] Specifically, as an optional implementation method in this embodiment, such as Figure 4As shown, the catheter 1 includes an inner layer 11, a metal reinforcing layer 12, and an outer layer 13. The instrument channel 14 is formed in the inner layer 11, and the liquid channel 32 and the bending channel 24 are both formed in the outer layer material inside or outside the metal reinforcing layer 12.

[0034] like Figure 4 As shown, the liquid channel 32 and the bending channel 24 are both formed inside the metal reinforcing layer 12.

[0035] The inner layer 11 is made of polytetrafluoroethylene (PTFE), which has good lubricity and antithrombotic properties.

[0036] The metal reinforcing layer 12 is a braided layer, which is composed of braiding, spring winding or laser-cut snake bone, providing a certain support and anti-torsion performance.

[0037] The outer layer 13 is made of various thermoplastic materials with different hardness, such as TPU, PEBAX, and NY12, and the outer layer material provides a gradient of hardness for propulsion within the blood vessel.

[0038] During the manufacturing process of the conduit 1, the inner layer is first made. During the manufacturing process, the corresponding mandrel is placed in advance. The mandrel is used to form the liquid channel 32 or the bending channel 24. Then, a metal reinforcing layer, i.e. a braided layer, is set. Then, an outer layer 13, i.e. a film-coated fluid thermoplastic material, is set on the outside. The plastic material is bonded to the inner layer 11 through the braided layer, thereby forming the composite conduit 1.

[0039] Liquid channels 32 or bending channels 24 can also be formed on the outer layer. Simply place the corresponding mandrel at position 13 on the outer layer during the coating process and then coat the film.

[0040] Specifically, as an optional implementation method in this embodiment, such as Figure 3 As shown, a knob groove is provided on the handle rod 4, and the knob groove extends through the handle rod 4 from top to bottom. The bending knob 23 is set in the knob groove via a rotating shaft, and both the upper and lower ends of the bending knob 23 extend out of the knob groove.

[0041] Specifically, as an optional implementation method in this embodiment, such as Figure 3 As shown, the conduit 1 and the handle rod are sealed with glue.

[0042] Adhesive is applied to both sides of the injection hole 41. The two adhesive applications connect the injection hole 41 to the injection channel of the conduit 1, preventing the liquid in the injection channel from flowing to other places and isolating the liquid from the bending channel 24.

[0043] Specifically, as an optional implementation method in this embodiment, such as Figure 3As shown, the bending knob 23 has a toothed rim around its perimeter. This toothed rim allows for dual compatibility with both manual and vascular surgery robots, reducing the need for additional instruments and personnel during surgery.

[0044] In this embodiment, the number of liquid channels 32 can be one or two. When there is one liquid channel 32, the front end of the conduit 1 bends in one direction. When there are two liquid channels 32, the front end of the conduit 1 can bend in two directions. The bending knob 23 can bend the conduit 1 in two directions by turning it forward and backward.

[0045] The traction ring 21 is located inside the conduit 1 and is pre-embedded during the production of the conduit 1. The traction ring 21 is connected to the bending channel 24 so that the front end of the bending wire 22 can be connected to the traction ring 21.

[0046] Specifically, as an optional implementation in this embodiment, the handle has a slider for engaging the bending adjustment knob. When the slider moves forward, it engages a gear to secure the bending adjustment knob; when the slider moves backward, it unlocks the knob. The slider's movement structure can be referenced in the prior patent, CN218552888U - A sliding locking mechanism in an adjustable high-torque balloon microcatheter.

[0047] The balloon function of the adjustable bendable balloon microcatheter: the balloon 31 is inflated through the injection hole 41, and after passing through the liquid channel 32, the liquid flows out from the outlet to inflate the balloon 31, thereby enabling the balloon 31 to function.

[0048] By applying glue to the sealing ports on both sides of the balloon injection port on the handle rod, the liquid channel 32 of the balloon 31 is separated from the handle rod, thus avoiding mutual interference, which could lead to liquid leakage or affect the bending.

[0049] The balloon of the adjustable bendable balloon microcatheter does not inflate balloon 31 when it is in the bendable state, but inflates balloon 31 when it is restored to the bendable state, thereby realizing the function of the balloon.

[0050] The bending function is achieved through the bending knob 23, on which the bending wire 22 is fixed, converting the rotational motion into linear motion along the long axis of the conduit 1. The bending wire 22 moves in the bending channel 24, transmitting the bending traction force to the traction ring 21 at the far end of the conduit 1, thereby causing the distal end of the tube to bend.

[0051] The instrument delivery function of the microcatheter is achieved through the circular cavity in the middle instrument channel 14, in which instruments such as stents can be delivered.

[0052] The balloon microcatheter of this invention is a non-coaxial multi-lumen tube with a simpler structure. It can separate the liquid channel 32, the bending channel 24, and the instrument channel 14 to avoid interference and prevent leakage from the bending wire 22 when the balloon 31 is inflated.

[0053] The present invention features a well-integrated tube body, which can effectively transmit torque. In contrast, traditional coaxial double-lumen tube products using 13 inner and outer layers generally have poor overall integrity. Due to the presence of a long annular gap in the middle, torque cannot be effectively transmitted when the tube body is twisted, which may lead to product kinking and breakage.

[0054] The balloon microcatheter of this invention can combine a balloon, a microcatheter, and a bendable catheter, and can be used in conjunction with a robot.

[0055] All the devices (parts whose specific structures are not specified) selected in this application are general standard parts or parts known to those skilled in the art. Their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0056] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0057] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0058] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the shown or discussed mutual couplings, direct couplings, or communication connections may be through some communication interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0059] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0060] In addition, in the various embodiments of this utility model, each functional unit can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0061] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An adjustable bend balloon microcatheter, characterized by, include The catheter has an instrument channel in the middle, at least one liquid channel and at least one bending channel around its perimeter, a balloon and a traction ring on the catheter, the balloon is connected to the liquid channel, a bending wire is provided in the bending channel, and the distal end of the bending wire is connected to the traction ring; The handle assembly includes a handle rod and an adjustment knob. The adjustment knob rotates on the handle rod. The rear end of the conduit passes longitudinally through the handle rod. The front end of the handle rod has an injection hole that communicates with the liquid channel of the conduit. The adjustment wire passes through the conduit and connects to the adjustment knob.

2. The adjustable-bend balloon microcatheter according to claim 1, characterized in that, The catheter includes an inner layer, a metal reinforcement layer, and an outer layer. The instrument channel is formed in the inner layer, and the liquid channel and the bending channel are both formed in the outer layer material inside or outside the metal reinforcement layer. The inner layer is made of polytetrafluoroethylene, the metal reinforcing layer is a woven layer, and the outer layer is made of thermoplastic material.

3. The adjustable-bend balloon microcatheter according to claim 1, characterized in that, A knob groove is provided on the handle rod, and the knob groove extends through the handle rod from top to bottom. The bending knob is set in the knob groove via a rotating shaft, and both the upper and lower ends of the bending knob extend out of the knob groove.

4. The adjustable-bend balloon microcatheter according to claim 1, characterized in that, The conduit and the handle rod are sealed with glue.

5. The adjustable-bend balloon microcatheter according to claim 1, characterized in that, The bending knob has a serrated edge around its perimeter.

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