CN219022862U - Medical catheter - Google Patents

Abstract

The present utility model provides a medical catheter comprising: an inner tube and an outer tube; the outer pipe is sleeved outside the inner pipe; the outer tube is divided into a moving section and a telescopic section from the near end to the far end in sequence; the telescopic section can be switched between a straight state and a protruding state, the moving section can move along the axial direction, and when the moving section moves along the axial direction towards the distal end of the medical catheter, the telescopic section is extruded to protrude outwards along the radial direction and is contacted with the inner wall of a blood vessel to form the protruding state; the telescoping section resumes the straightened state when the moving section moves axially toward the proximal end of the medical catheter. So configured, the telescoping section is extruded to protrude outwardly and contact the inner wall of the vessel after the medical catheter is in place, so that the medical catheter has good support performance.

Description

Medical catheter

Technical Field

The utility model relates to the field of medical instruments, in particular to a medical catheter.

Background

The access is the basis of neural intervention, and establishing a good access is a major aspect of interventional therapy. Compared with a femoral artery access, the radial artery access is safer, the radial artery access is shallow and easy to compress, a vascular closure is not needed, bleeding is less, hemostasis is easy, the complication occurrence rate is lower, the comfort level of a patient is higher, and the patient does not need to lie in bed after operation.

Domestic operators try to use a transfemoral access catheter to establish an access through the radius, such as a bridge silver snake, an intermediate catheter, a long sheath and the like, but all the catheters are straight heads or multifunctional heads, the over-selection of blood vessels on the arch is difficult, the over-selection is often carried out by virtue of a Simmons catheter coaxial technology, the technology is called an R-DSA coaxial technology, namely, the radial DA/DAC+simmons catheter coaxial technology, and the same principle is adopted by the radial arterial system which is currently marketed abroad. The hardness of the nerve intervention catheter in the prior art is gradually reduced from the proximal end to the distal end, and the rigidity of the catheter is not adjustable due to the multi-layer structure.

To sum up, the catheters of the prior art have two problems: (1) The stiffness design of the distal end of the passageway makes it difficult to access the cerebral vessels from the ascending aortic arch; (2) The supporting property of the passage is insufficient, and the passage is easy to drop into the arch from the cerebral vessel in the conveying process of the subsequent apparatus.

Disclosure of Invention

The utility model aims to provide a medical catheter which solves the problems that the rigidity of the head end of the catheter is not adjustable and the flexibility and the support cannot be achieved.

In order to achieve the above object, the present utility model provides a medical catheter comprising: the inner pipe and the outer pipe are sleeved outside the inner pipe;

the outer tube is divided into a moving section and a telescopic section from the proximal end to the distal end in sequence, the telescopic section can be switched between a straight state and a protruding state, the moving section can move along the axial direction, and when the moving section moves towards the distal end of the medical catheter along the axial direction, the telescopic section is extruded to protrude outwards along the radial direction and is contacted with the inner wall of a blood vessel to form the protruding state; the telescoping section resumes the straightened state when the moving section moves axially toward the proximal end of the medical catheter.

Optionally, when the telescopic section is in the flat state, the inner wall of the telescopic section is attached to the outer wall of the inner tube.

Optionally, the telescopic section has at least two petals, at least two of which are uniformly distributed along the circumferential direction, the proximal ends of the petals are connected together, the distal ends of the petals are connected together, and when the moving section moves axially toward the distal end of the medical catheter, the petals are pressed to protrude radially outwards.

Optionally, the medical catheter further comprises a fixation structure arranged at the distal side of the telescoping section for limiting the axial position of the distal end of the outer tube relative to the inner tube.

Optionally, the distal end of the outer tube is fixed to the distal end of the inner tube.

Optionally, the axial length of the outer tube is less than the axial length of the inner tube.

Optionally, the medical catheter further comprises a control assembly comprising a drive structure located at the proximal end of the medical catheter for driving the movement section to move axially.

Optionally, the control assembly further comprises a locking structure connected to the outer tube for limiting axial movement of the moving section.

Optionally, the inner tube has an inner layer, an intermediate layer and an outer layer which are sequentially arranged from inside to outside, and the outer wall of the inner layer is attached to the inner wall of the intermediate layer.

Optionally, the hardness of the distal end of the outer layer is lower than the hardness of the proximal end of the outer layer.

Optionally, the inner tube further has at least one developing ring, the intermediate layer having an axial length less than the axial length of the inner and outer layers, a proximal side of the intermediate layer being aligned with the proximal sides of the inner and outer layers, the developing ring being disposed on a distal side of the intermediate layer and between the outer and inner layers for positioning a distal end of the medical catheter.

Optionally, the medical catheter further comprises an anti-hemagglutination membrane layer, and the anti-hemagglutination membrane layer is coated on the outer wall of the telescopic structure.

Optionally, the outer tube has a single-layer structure.

In summary, the present utility model provides a medical catheter, which includes: the device comprises an inner pipe and an outer pipe, wherein the outer pipe is sleeved outside the inner pipe; the outer tube is divided into a moving section and a telescopic section from the proximal end to the distal end in sequence, the telescopic section can be switched between a straight state and a protruding state, the moving section can move along the axial direction, and when the moving section moves towards the distal end of the medical catheter along the axial direction, the telescopic section is extruded to protrude outwards along the radial direction and is contacted with the inner wall of a blood vessel to form the protruding state; the telescoping section resumes the straightened state when the moving section moves axially toward the proximal end of the medical catheter. Compared with the existing medical catheter, the utility model has the following advantages:

(1) In the conveying process of the medical catheter, the telescopic section is attached to the outer wall of the inner tube, so that the original flexibility of the catheter can be maintained; after the medical catheter is in place, the telescopic section is extruded by the moving section to protrude outwards along the radial direction and is contacted with the inner wall of the blood vessel, so that the catheter has good supporting property;

(2) Further, the telescopic section is provided with at least two valve leaves, and gaps exist between adjacent valve leaves in the process that the at least two valve leaves are extruded to protrude outwards, so that the normal flow of blood flow at the contact part can be ensured;

(3) Further, a fixing structure is axially arranged at the distal side of the telescopic section, so that the telescopic section can be fixed at the distal end or the middle part of the inner tube to adapt to different types of blood vessels.

Drawings

FIG. 1 is a schematic view of a medical catheter during delivery according to an embodiment of the present utility model;

FIG. 2 is a schematic view of a medical catheter with two leaflets according to an embodiment of the present utility model;

FIG. 3 is a schematic view of a medical catheter with three leaflets according to an embodiment of the present utility model;

fig. 4 is a schematic structural diagram of a medical catheter with an anti-hemagglutination membrane layer according to an embodiment of the present utility model.

Wherein, each reference sign is explained as follows:

1-an inner tube; 2-an outer tube; 3-a fixed structure; 21-a movement section; 22-telescoping sections; 221-leaflet; 222-anti-hemagglutination membrane layer.

Detailed Description

The utility model will be described in further detail with reference to the drawings and the specific embodiments thereof in order to make the objects, advantages and features of the utility model more apparent. It should be noted that the drawings are in a very simplified form and are not drawn to scale, merely for convenience and clarity in aiding in the description of embodiments of the utility model. Furthermore, the structures shown in the drawings are often part of actual structures. In particular, the drawings are shown with different emphasis instead being placed upon illustrating the various embodiments.

As used in this specification, the singular forms "a," "an," and "the" include plural referents, the term "or" is generally used in the sense of comprising "and/or" and the term "several" is generally used in the sense of comprising "at least one," the term "at least two" is generally used in the sense of comprising "two or more," and the term "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying any relative importance or number of technical features indicated. Thus, features defining "first," "second," "third," and "third" may include one or at least two such features, either explicitly or implicitly, "one end" and "another end" and "proximal" and "distal" generally refer to the corresponding two portions, including not only the endpoints, where "proximal" generally represents the direction of approach to the physician during the procedure and "distal" generally represents the direction of approach to the lesion during the procedure. The terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; 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. Furthermore, as used in this specification, an element disposed on another element generally only means that there is a connection, coupling, cooperation or transmission between the two elements, and the connection, coupling, cooperation or transmission between the two elements may be direct or indirect through intermediate elements, and should not be construed as indicating or implying any spatial positional relationship between the two elements, i.e., an element may be in any orientation, such as inside, outside, above, below or on one side of the other element unless the context clearly indicates otherwise. The terms "upper", "lower", "top" and "bottom" are generally relative positional relationships arranged in the direction of gravity; the term "vertical, vertical direction" generally refers to a direction along the force of gravity that is generally perpendicular to the ground, and "horizontal, horizontal direction" generally refers to a direction parallel to the ground; the specific meaning of the above terms in this specification will be understood by those of ordinary skill in the art in view of the specific circumstances.

The utility model aims to provide a medical catheter which solves the problems that the rigidity of the head end of the catheter is not adjustable and the flexibility and the support cannot be achieved.

The following description refers to the accompanying drawings.

Referring to fig. 1, the present utility model provides a medical catheter, comprising: an inner tube 1 and an outer tube 2; the outer tube 2 is sleeved outside the inner tube 1; the outer tube 2 is divided into a moving section 21 and a telescoping section 22 in order from the proximal end to the distal end. Further, the medical catheter further comprises a fixation structure 3, the fixation structure 3 being arranged at the distal side of the telescoping section 22 for limiting the axial position of the distal end of the outer tube 2 relative to the inner tube 1. It should be noted that, in the examples shown in fig. 1 to 4, the proximal end represents a direction approaching the doctor during the operation, and the distal end represents a direction approaching the lesion position during the operation. The inner tube 1 and the outer tube 2 are made of one or more materials selected from nylon elastomer (Pebax), polyurethane (PU), polytetrafluoroethylene (PTFE), etc., and those skilled in the art can configure the materials of the inner tube 1 and the outer tube 2 according to the use of the catheter, which is not limited in the present utility model.

Further, the outer tube 2 has a single-layer structure, and the inner tube 1 has an inner layer, an intermediate layer and an outer layer sequentially arranged from inside to outside, and the outer wall of the inner layer is attached to the inner wall of the intermediate layer. In the example shown in fig. 1, the inner layer, the intermediate layer, and the outer layer are not shown, and those skilled in the art will understand that the inner layer, the intermediate layer, and the outer layer are all tubular members constituting the inner tube 1, and the inner tube 1 may be a woven structure, a coil structure, or an engraved structure made of stainless steel, nitinol, cobalt-chromium alloy, or polymer filaments, etc. Those skilled in the art may select suitable materials and structures depending on the actual use of the catheter, and the present utility model is not limited in this regard.

In an alternative embodiment, the inner layer is made of Polytetrafluoroethylene (PTFE), the middle layer is a woven structure, the outer layer is made of nylon elastomer (Pebax), and the hardness of the distal end of the outer layer is lower than that of the proximal end of the outer layer because the nylon elastomer (Pebax) has the characteristic of changeable hardness, so configured, the inner tube 1 has the characteristic of gradually decreasing hardness from the proximal end to the distal end, at this time, the distal end of the medical catheter is soft, has good in-place performance, and further enhances the practicability of the medical catheter.

Still further, the inner tube 1 has at least one developing ring, the axial length of the intermediate layer being smaller than the axial length of the inner and outer layers, the proximal side of the intermediate layer being aligned with the proximal sides of the inner and outer layers, the developing ring being arranged at the distal side of the intermediate layer and between the outer and inner layers for positioning the distal end of the medical catheter. It should be noted that in the example shown in fig. 1, the developing ring is not shown, and those skilled in the art will appreciate that the developing ring functions to locate the distal end position of the medical catheter, and thus, the developing ring is ring-shaped to fit the surface of the catheter, and may be made of platinum, or other metal alloys. Of course, in other embodiments, the developing ring may be other members having the same function, and the shape thereof may be other reasonable shapes, which is not limited in this regard.

With continued reference to fig. 1 to 2, in the medical catheter provided in this embodiment, the telescopic section 22 is switchable between a straight state and a protruding state, the movable section 21 is axially movable, and when the movable section 21 is axially moved toward the distal end of the medical catheter, the telescopic section 22 is pressed to protrude radially outwards and contact with the inner wall of the blood vessel to form the protruding state; the telescoping section 22 resumes the straightened state when the moving section 21 moves axially toward the proximal end of the medical catheter. In the example shown in fig. 1 to 2, the axial direction is the left-right direction, the radial direction is the up-down direction, and during the process of delivering the medical catheter, the telescopic section 22 is attached to the outer wall of the inner tube 1, and at this time, the telescopic section 22 is in a straight state (at this time, the state is shown in fig. 1); after the medical catheter is in place, the movable section 21 moves towards the distal end of the medical catheter along the axial direction, the telescopic section 22 is extruded to protrude outwards along the radial direction, and at the moment, the telescopic section 22 is converted from a straight state to a protruding state (the state at the moment is shown in fig. 2) and is contacted with the inner wall of the blood vessel; after the catheter is completed, the movable section 21 moves axially toward the proximal end of the medical catheter until the inner wall of the telescopic section 22 is in contact with the outer wall of the inner tube 1, at which time the telescopic section 22 is converted from a convex state to a straight state (the state at this time is shown in fig. 1). So configured, the medical catheter can maintain its original flexibility during delivery; after the medical catheter is in place, the telescopic section 22 protrudes outwards along the radial direction, contacts with the inner wall of the blood vessel, supports the blood vessel, and avoids falling off of a passage in the process of conveying subsequent instruments in the catheter, so that potential safety hazards are caused. So configured, the provision of telescoping section 22 allows the catheter to be flexible and supportive, improving the utility of the medical catheter, and at the same time, further improving the safety of the medical catheter.

Further, when the telescopic section 22 is in the straight state, the inner wall of the telescopic section 22 is attached to the outer wall of the inner tube 1. So configured, the medical catheter can maintain its original flexibility in the process of delivery or withdrawal, and the medical catheter is not easy to damage the inner wall of the blood vessel while accurately reaching the target position, thereby further improving the practicability of the medical catheter.

Still further, referring to fig. 2 to 3, the telescopic section 22 has at least two lobes 221, the at least two lobes 221 are uniformly distributed along the circumference of the outer tube 2, the proximal ends of the lobes 221 are connected together, and the distal ends of the lobes 221 are connected together; as the moving section 21 moves axially toward the distal end of the medical catheter, the leaflets 221 are pressed to bulge radially outward. So configured, in the process of being extruded to protrude radially outwards, a gap exists between two adjacent valve blades 221, and in the process of contacting the valve blades 221 with the inner wall of a blood vessel, the gap can ensure the normal flow of blood flow at the contact position, so that the blood vessel is not blocked, the life of a patient is not damaged, and meanwhile, the valve blades 221 have good elasticity and biocompatibility, the inner wall of the blood vessel and the middle catheter are not damaged, and the safety performance of the medical catheter in the use process is further improved. In other embodiments, the telescoping section 22 may be of other configurations that are capable of deforming without affecting blood flow, as the utility model is not limited in this regard.

As an alternative embodiment, the number of leaflets 221 may be two or three, although in other embodiments, the number of leaflets 221 may be four or more, as the utility model is not limited in this respect. Preferably, in the example shown in fig. 4, the medical catheter further includes an anti-hemagglutination membrane layer 222, where the anti-hemagglutination membrane layer 222 is wrapped on the outer wall of the telescopic section 22, and the anti-hemagglutination membrane layer 222 is a polymer membrane, which can better protect the inner wall of the blood vessel from being damaged, and prevent the blood from being coagulated at the junction between the valve leaflet 221 and the inner wall of the blood vessel, so that the blood circulation is not smooth.

As an alternative embodiment, the distal end of the outer tube 2 is fixed to the distal end of the inner tube 1. Further, the axial length of the outer tube 2 is smaller than the axial length of the inner tube 1. In other embodiments, the distal end of the outer tube 2 may be fixed to the middle portion of the inner tube 1, and the axial length of the outer tube 2 may be equal to the axial length of the inner tube 1, so that those skilled in the art may configure the relative positions of the inner tube 1 and the outer tube 2 according to practical situations, which is not limited in the present utility model.

As an alternative embodiment, in the example shown in fig. 1, the fixation structure 3 is arranged close to the distal end of the medical catheter, and correspondingly the telescoping section 22 is also arranged close to the distal end of the medical catheter. It should be noted that, the fixing structure 3 is connected to the outer wall of the inner tube 1 and serves to define the axial position of the distal end of the outer tube 2 relative to the inner tube 1, so that it is an annular member adapted to the outer wall of the inner tube 1, and of course, in some other examples, the fixing structure 3 may be disposed in the middle of the medical catheter, and the telescopic structure 22 may be disposed in the middle of the medical catheter. So configured, the telescoping section 22 is capable of changing its position according to the size of the blood vessel, enhancing the utility of the medical catheter.

As a preferred embodiment, the medical catheter further comprises a control assembly comprising a drive structure at the proximal end of the medical catheter for driving the movement section 21 in axial movement. Further, the control assembly also comprises a locking structure, which is connected to the outer tube 2 for limiting the movement of the moving section 21 in the axial direction. It should be noted that, in the examples shown in fig. 1 to 2, the driving structure and the locking structure are not shown, and those skilled in the art will understand that the driving structure and the locking structure are both connected to the outer tube 2, where the driving structure may be a push-pull handle structure, and the handle is configured with the locking structure, and the locking structure may be a rod-shaped member, which is connected to the moving section 21, and when the handle slider is slid toward the distal end of the medical catheter, the moving section 21 moves toward the distal end of the medical catheter in the axial direction, the telescoping section 22 is extruded to protrude radially outwards and contact with the inner wall of the blood vessel, at this time, the telescoping section 22 is converted from a straight state to a protruding state (at this time, as shown in fig. 2), and at the same time, the locking structure is made to contact with the moving section 21 by pressing the locking structure, and the axial position of the moving section 21 is limited, so that the telescoping section 22 maintains the state of contact with the inner wall of the blood vessel; when the catheter is completed, the locking structure is separated from the moving section 21 by pressing the locking structure again, so that the restriction on the axial position of the moving section 21 is released, the handle slider is simultaneously slid toward the proximal end of the medical catheter, the moving section 21 moves toward the proximal end of the catheter along the axial direction, the telescopic section 22 is stretched until being attached to the outer wall of the inner tube 1, and at this time, the telescopic section 22 is converted from the convex state to the straight state (the state at this time is shown in fig. 1). Of course, in other examples, the driving structure and the locking structure may be other members having the same function, which is not limited in this utility model.

In summary, the present utility model provides a medical catheter, comprising: the device comprises an inner pipe and an outer pipe, wherein the outer pipe is sleeved outside the inner pipe; the outer tube is divided into a moving section and a telescopic section from the proximal end to the distal end in sequence, the telescopic section can be switched between a straight state and a protruding state, the moving section can move along the axial direction, and when the moving section moves along the axial direction to the distal end of the medical catheter, the telescopic section is extruded to protrude outwards along the radial direction and is contacted with the inner wall of a blood vessel to form a protruding state; the telescoping section resumes a straight state when the moving section moves axially toward the proximal end of the medical catheter.

The medical catheter is configured in such a way that the telescopic section is attached to the outer wall of the inner tube in the conveying process, so that the original flexibility of the medical catheter can be maintained; after the medical catheter is in place, the telescopic section is extruded by the moving section to protrude outwards along the radial direction and is contacted with the inner wall of the blood vessel, so that the medical catheter has good supporting property and the safety performance of the medical catheter is improved; furthermore, the telescopic section is provided with at least two valve leaves, and gaps exist between adjacent valve leaves in the process that the at least two valve leaves are extruded to protrude outwards, so that the normal flow of blood flow at the contact part can be ensured, and the safety performance of the medical catheter in the use process is further improved; furthermore, the fixing structure is axially arranged at the far end side of the telescopic section, so that the telescopic section can be fixed at the far end or the middle part of the inner tube to adapt to different types of blood vessels, and the practicability of the medical catheter is improved.

The above description is only illustrative of the preferred embodiments of the present utility model and is not intended to limit the scope of the present utility model, and any alterations and modifications made by those skilled in the art based on the above disclosure shall fall within the scope of the appended claims.

Claims (13)

1. The medical catheter is characterized by comprising an inner tube and an outer tube, wherein the outer tube is sleeved outside the inner tube;

the outer tube is divided into a moving section and a telescopic section from the proximal end to the distal end in sequence, the telescopic section can be switched between a straight state and a protruding state, the moving section can move along the axial direction, and when the moving section moves towards the distal end of the medical catheter along the axial direction, the telescopic section is extruded to protrude outwards along the radial direction and is contacted with the inner wall of a blood vessel to form the protruding state; the telescoping section resumes the straightened state when the moving section moves axially toward the proximal end of the medical catheter.

2. The medical catheter of claim 1, wherein an inner wall of the telescoping section conforms to an outer wall of the inner tube when the telescoping section is in the flattened state.

3. The medical catheter of claim 1, wherein the telescoping section has at least two lobes, at least two of the lobes being circumferentially evenly distributed, the proximal ends of the lobes being connected together, the distal ends of the lobes being connected together, the lobes being compressed to bulge radially outward as the moving section moves axially toward the distal end of the medical catheter.

4. The medical catheter of claim 1, further comprising a securing structure disposed on a distal side of the telescoping section for limiting an axial position of the distal end of the outer tube relative to the inner tube.

5. The medical catheter of claim 1, wherein a distal end of the outer tube is fixed to a distal position of the inner tube.

6. The medical catheter of claim 1, wherein the outer tube has an axial length that is less than an axial length of the inner tube.

7. The medical catheter of claim 1, further comprising a control assembly comprising a drive structure at a proximal end of the medical catheter for driving the movement section to move axially.

8. The medical catheter of claim 7, wherein the control assembly further comprises a locking structure coupled to the outer tube for limiting axial movement of the moving section.

9. The medical catheter of claim 1, wherein the inner tube has an inner layer, an intermediate layer, and an outer layer disposed in that order from inside to outside, an outer wall of the inner layer being affixed to an inner wall of the intermediate layer.

10. The medical catheter of claim 9, wherein the hardness of the distal end of the outer layer is lower than the hardness of the proximal end of the outer layer.

11. The medical catheter of claim 9, wherein the inner tube further has at least one developing ring, the intermediate layer having an axial length less than the axial lengths of the inner and outer layers, a proximal side of the intermediate layer being aligned with the proximal sides of the inner and outer layers, the developing ring being disposed on a distal side of the intermediate layer and between the outer and inner layers for positioning a distal end of the medical catheter.

12. The medical catheter of claim 1, further comprising an anti-coagulum layer wrapped around the outer wall of the telescoping section.

13. The medical catheter of claim 1, wherein the outer tube is of a single layer construction.

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