CN219440369U

CN219440369U - Medical instrument with variable rigidity

Info

Publication number: CN219440369U
Application number: CN202221811778.7U
Authority: CN
Inventors: 吴猛
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-07-13
Filing date: 2022-07-13
Publication date: 2023-08-01
Anticipated expiration: 2032-07-13

Abstract

The utility model discloses a medical device with variable rigidity, which comprises: a micro-member adapted to be inserted into a body, and an electrorheological fluid carried by the micro-member, wherein the electrorheological fluid has an electric field disposed on an outer surface of the micro-member, and the electrorheological fluid is contained within a container, while the electrorheological fluid contains particles in a liquid, the particles comprising a composite of at least two different compositions, the advantages of the present utility model: by application of an electric field, the electrorheological fluid is able to reversibly transition between a liquid-like state and a gel or solid state, thereby changing the gap of a medical device in which the electrorheological fluid is used. In the proximal portion, the galvanic fluid may enhance the pushability of the medical device, while in the distal portion, the galvanic fluid may enhance the flexibility and trackability of the device.

Description

Medical instrument with variable rigidity

Technical Field

The utility model belongs to the technical field of medical treatment, and mainly relates to a medical instrument with variable rigidity.

Background

Intravascular medical devices, such as vascular clamps, guidewires, catheters, and medical catheters, allow a physician to perform a medical procedure. For example, one balloon catheter may be used to administer various treatments. In angioplasty, balloon catheters can be used to widen a contracting body vessel, such as a coronary artery. Balloon catheters may also be used to deliver a tubular member, such as a stent, that is placed in the body to strengthen or reopen an occluded vessel.

In angioplasty, a balloon may be used to treat a vascular stenosis or a body vascular stenosis and deliver it to a vascular region where the vascular stenosis is restricted in blood flow. The balloon catheter uses a guidewire that is placed over the patient's vasculature at a convenient location and then delivered, e.g., pushed through the vasculature to the target site. After reaching the site, the balloon is inflated, for example, by injecting a liquid into the interior of the balloon. The dilation balloon may radially dilate the stenosis, enabling the vessel to allow an acceptable blood flow rate. After use, the balloon is folded and retracted.

During stent delivery, the stent is compacted on the balloon and delivered to the target site. After reaching the site, the balloon may be inflated to deform and secure the stent in a predetermined position, e.g., in contact with the vessel wall. The balloon may then be folded and retracted.

In some cases, the path of the device through the vascular system to the target site may be relatively tortuous, e.g., requiring the device to change direction frequently.

Disclosure of Invention

The utility model aims at: a medical device is provided that has relatively good tracking and good pushability, enabling the apparatus to move along a tortuous path and to transmit forces applied to the proximal end of the device to the distal end.

The technical scheme of the utility model is as follows: a medical device having variable stiffness, comprising: a body, a micro-member adapted to be inserted into the body, and an electrorheological fluid carried by the micro-member, wherein the micro-member comprises at least two conductive members that form an electric field, the electrorheological fluid being located between the two conductive members and being in a liquid or solid state and being transformed from a liquid state to a gel or solid state upon application of the electric field, and upon removal of the applied electric field the electrorheological fluid is transformed from the gel or solid state to the liquid state.

On the basis of the technical scheme, the method further comprises the following auxiliary technical scheme:

the electrorheological fluid comprises a liquid when in the liquid state, and particles in the liquid, and the particles comprise at least two different compositions.

The particles include a first composition and a second composition coating the first composition.

The liquid is an oily body.

The particles are a mixture of any two or more than three of urea, butylamine and acetamide.

The micro-member includes a cavity that receives an electrorheological fluid.

The electrorheological fluid comprises a first electrorheological fluid, and a second electrorheological fluid different from the first electrorheological fluid in composition, wherein the first electrorheological fluid has a first volume concentration, and the second electrorheological fluid has a second volume concentration different from the first volume concentration.

The body is a catheter or guidewire, wherein the catheter is a tubular catheter, balloon catheter, or stent delivery catheter.

The utility model has the advantages that: by application of an electric field, the electrorheological fluid is able to reversibly transition between a liquid-like state and a gel or solid state, thereby changing the gap of a medical device in which the electrorheological fluid is used. In the proximal portion, the galvanic fluid may enhance the pushability of the medical device, while in the distal portion, the galvanic fluid may enhance the flexibility and trackability of the device.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a cross-sectional view of an over-the-wire balloon catheter of the present utility model at a first view angle;

FIG. 2 is a cross-sectional view of the over-the-wire balloon catheter of the present utility model at a second view angle;

FIG. 3 is a cross-sectional view of the over-the-wire balloon catheter of the present utility model at a first view angle;

FIG. 4 is a cross-sectional view of the over-the-wire balloon catheter of the present utility model at a second view angle;

FIG. 5 is a cross-sectional view of a first guidewire of the present utility model;

FIG. 6 is a cross-sectional view of a second guidewire of the present utility model;

FIG. 7 is a cross-sectional view of a third guidewire of the present utility model;

fig. 8 is a cross-sectional view of a micro-component of the present utility model.

Detailed Description

First embodiment: referring to fig. 1 and 2, the present utility model discloses a first balloon catheter 1 with variable stiffness over-wires, comprising: a first micro-member 2 having three lumens, a balloon 204 inflatable at the distal end of the first micro-member 2, a pair of first conductive members 205 disposed on either side of one of the lumens, wherein the three lumens are a first guidewire lumen 201, a first inflation lumen 202, and a second inflation lumen 203, respectively.

The first guidewire lumen 201 is used to pass the first balloon catheter 1 over the placed guidewire and deliver the first balloon catheter 1 to the target site. A first inflation lumen 202 in fluid communication with the interior of the balloon 204 for inflating and deflating the balloon 204 with a fluid. The second inflation lumen 203 contains an electrorheological fluid capable of varying its resistance to fluid flow to provide the first balloon catheter 1 with a variable opening. The first conductive member 205 is disposed on both sides of the second expansion chamber 203, forming an electric field that can apply a force to the electrorheological fluid in the second expansion chamber 203.

Electrorheological fluids are materials whose rheological properties can be selectively changed, such as by the application of an applied electric field through the first conductive member 205. Electrorheological fluids can increase their viscosity by converting from a liquid-like material to a gel or solid material capable of exhibiting a solid-like behavior, such as transmitting shear stress, under the influence of an applied electric field. The current transformer is capable of rapidly and reversibly transitioning from a gel state or a solid state to a liquid-like state upon removal of an applied electric field. Thus, by integrating electrorheological fluid with the first balloon catheter 1 and controlling the applied electric field, the gap of the first balloon catheter 1 can be controlled. When an electric field is applied, the electrorheological fluid becomes a gel-like or solid-like material, increasing the gap of the first balloon catheter 1, and when the electric field is removed, the electrorheological fluid becomes a liquid-like material, decreasing the gap of the first balloon catheter 1, thereby increasing the flexibility of the first balloon catheter 1.

In some embodiments, the electrorheological fluid comprises a mixture of particles and a liquid that may have a high yield strength, such as a colloidal suspension. Under the influence of the electric field, induced polarization causes the particles to form an elongated chain, column or fiber structure aligned parallel to the electric field. An example of the particles is a composite particle having a barium titanate oxalate core and coated with an accelerator such as urea, butylamine, acetamide, or acrylamide. The particles may have an average size of about 50-70nm, and each particle may have a surface coating of about 3-10 nm. The particles may be present in a concentration of about 5% to about 50% by volume. The liquid in the electrorheological fluid may be an electrically insulating hydrophobic liquid, such as oils, silicone oils, mineral oils, engine oils, and hydrocarbon oils.

A second embodiment, shown with reference to fig. 3 and 4, the present utility model discloses a second balloon catheter 3 with variable stiffness over-wire comprising: a first micro-member 4 having three lumens, a second guidewire lumen 401, a third inflation lumen 402, a fourth inflation lumen 403, a pair of second conductive members 404 disposed about the periphery of the fourth inflation lumen 403, wherein the fourth inflation lumen 403 contains an electrorheological fluid.

The second conductive member 404 may extend the entire length of the second micro-member 4 or only selected portions of the second micro-member 4. The second balloon catheter 3 may include a plurality of spaced second conductive members 404 that may apply a selected electric field to provide a variable gap. The second conductive member 404 may be applied to the second micro member 4 using a sputtering technique.

In a third embodiment, and with reference to fig. 5, the electrorheological fluid described above may be applied to a first guide wire 5 comprising electrorheological fluid and a plurality of pairs of third conductive members 51a, 51b, 51c, different ones of which may independently apply different electric fields to affect variable stiffness along the length of the guide wire 5.

In a fourth embodiment, and with reference to fig. 6, the electrorheological fluid described above may be applied to a second guide wire 6 comprising electrorheological fluid and a plurality of pairs of third conductive members 61a, 61b, 61c, different third conductive members being independently applicable to different electric fields to affect variable stiffness along the length of the guide wire 6.

In a fifth embodiment, referring to fig. 7, the electrorheological fluid described above may be applied to a third guidewire 7 comprising a fixation lumen 71, a proximal end 72 of the third guidewire 7, a distal end 73 of the third guidewire 7, and the electrorheological fluid within the fixation lumen 71, the proximal end 72 of the third guidewire 7 being of a larger diameter than the distal end 73 of the third guidewire 7, whereby the proximal end 72 portion comprises a higher concentration of electrorheological fluid than the distal end 73 portion. The proximal portion 72 may be made stiffer than the distal portion 73 upon application of an electric field.

A sixth embodiment, as shown with reference to fig. 8, the electrorheological fluid described above may be applied to other medical devices including the outer sheath of an inner tubular member and/or a self-expanding stent delivery system, the micro-members of an endoscope, and other catheters, such as microcatheters for treating aneurysms, including: a third micro-member 8 having a thin cavity 81, a pair of conductive members 82, 83 disposed on the outer surface of the third lower field member 8.

Referring to fig. 1-8, an embodiment of a medical device having variable stiffness is disclosed, comprising: a body, a micro-member adapted to be inserted into the body, and an electrorheological fluid carried by the micro-member.

Electrorheological fluids comprise particles in a liquid, wherein the liquid is an oil.

The electrorheological fluid comprises: a first electrorheological fluid, and a second electrorheological fluid different from the first electrorheological fluid in composition, wherein the first electrorheological fluid has a first volumetric concentration and the second electrorheological fluid has a second volumetric concentration different from the first volumetric concentration.

The particles comprise at least two different compositions, and the first composition and the second composition coating the first composition, and the particles are a mixture of any two or more of urea, butylamine and acetamide.

The micro-member includes a cavity that receives an electrorheological fluid.

The micro component comprises at least two conductive components capable of forming an electric field, and the electrorheological fluid is positioned between the two conductive components and is converted into gel or solid from liquid-like under the action of the electric field; and upon removal of the applied electric field, the electrorheological fluid again changes from a gel or solid to a liquid-like body.

The above embodiments are merely for illustrating the technical concept and features of the present utility model, and are not intended to limit the scope of the present utility model to those skilled in the art to understand the present utility model and implement the same. All equivalent changes or modifications made according to the spirit of the main technical proposal of the utility model should be covered in the protection scope of the utility model.

Claims

1. A medical device having variable stiffness, comprising: a body, a micro-member adapted to be inserted into the body, and an electrorheological fluid carried by the micro-member, wherein the micro-member comprises at least two conductive members that form an electric field, the electrorheological fluid being located between the two conductive members and being in a liquid or solid state and being transformed from a liquid state to a gel or solid state upon application of the electric field, and upon removal of the applied electric field the electrorheological fluid is transformed from the gel or solid state to the liquid state.

2. The medical device with variable stiffness of claim 1, wherein: the electrorheological fluid comprises a liquid when in the liquid state, and particles in the liquid, and the particles comprise at least two different compositions.

3. The medical device with variable stiffness of claim 2, wherein: the particles include a first composition and a second composition coating the first composition.

4. The medical device with variable stiffness of claim 2, wherein: the liquid is an oily body.

5. The medical device with variable stiffness of claim 1, wherein: the micro-member includes a cavity that receives an electrorheological fluid.

6. The medical device with variable stiffness of claim 1, wherein: the electrorheological fluid comprises a first electrorheological fluid, and a second electrorheological fluid different from the first electrorheological fluid in composition, wherein the first electrorheological fluid has a first volume concentration, and the second electrorheological fluid has a second volume concentration different from the first volume concentration.

7. The medical device with variable stiffness of claim 1, wherein: the body is a catheter or guidewire, wherein the catheter is a tubular catheter, balloon catheter, or stent delivery catheter.