CN216703145U - Multi-section composite pipe for imaging catheter - Google Patents

Abstract

The utility model provides a multi-section composite tube for an imaging catheter, which comprises a proximal tube, a middle tube and a distal tube, wherein the middle tube comprises a metal mandrel, the surface of the metal mandrel is provided with a lubricating coating, the distal end of the metal mandrel is provided with a hollow section comprising a plurality of hollows, the proximal end of the metal mandrel and the connecting end of the metal mandrel and the hollow section are provided with connecting components, and the metal mandrel is respectively connected with the proximal tube and the distal tube through the connecting components. By adopting the technical scheme of the utility model, the base material of the middle-section pipe is made of metal, so that the rigidity of the middle-section pipe is improved, the pushing force is improved, and the lubricating coating arranged on the surface of the metal is more stable in chemical property and is not easy to fall off and lose efficacy; the hollow section at the far end forms a flexible structure, so that the flexible structure can be bent when passing through the blood vessel and the catheter, the bending angle of the blood vessel is adapted, and the blood vessel is not damaged.

Description

Multi-section composite pipe for imaging catheter

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a multi-section composite tube for an imaging catheter.

Background

The sheath is one of the core components of the imaging catheter and serves to protect the imaging core. In use, the outer sheath needs to be advanced within a curved coronary vessel, and the distal end of the outer sheath needs to be advanced across a stenosis or lesion to provide a pathway for scanning and imaging of the imaging core. In order to protect the soft and slender coronary vessels, the distal end of the outer sheath tube also needs to be somewhat flexible. In order to combine excellent pushing performance and flexibility with the outer sheath, the outer sheath is usually designed as a multi-segment tube. The proximal end of the multi-section tube is a hard tube for protecting the pull-back section of the imaging core. The middle section is generally a section of polyimide tubing used to protect the spring tube of the imaging core. The far end is a section of transparent soft tube used for imaging and passing through a narrow coronary vessel.

However, in the prior art, the polyimide used in the middle tube has poor rigidity due to its small size, so that the pushing force is greatly reduced when the imaging catheter is pushed to the end of the coronary artery, and the clinical requirements are difficult to meet. For imaging catheters exceeding 2 meters, polyimide tubing is completely inadequate for use. In order to increase the lubricity of the polyimide tube and reduce the resistance of the polyimide tube when the polyimide tube passes through a blood vessel or a catheter, an ultra-smooth coating is often required to be coated outside the polyimide tube. On the other hand, polyimide materials belong to materials difficult to bond, bonding of the middle section and the far end of the sheath tube becomes a special process, a large amount of materials are often needed to be verified to ensure bonding effectiveness, but in actual production, poor bonding in a certain proportion can still occur, a large amount of waste of materials is caused, and production cost is indirectly increased.

SUMMERY OF THE UTILITY MODEL

Aiming at the technical problem, the utility model discloses a multi-section composite tube for an imaging catheter, which has better pushing performance, improves the reliability of the catheter in passing through complex lesions and is more stable to use.

In contrast, the technical scheme of the utility model is as follows:

the utility model provides a compound pipe of multistage for formation of image pipe, its includes near-end pipe, well section pipe and distal end pipe, the well section pipe includes the metal dabber, the surface of metal dabber is equipped with the lubricating coating, the distal end of metal dabber is equipped with the fretwork section that contains a plurality of fretworks, the near-end of metal dabber, metal dabber and the link of fretwork section are equipped with connecting means, the metal dabber is connected with near-end pipe, distal end union coupling respectively through connecting means. Wherein the proximal tube is used for protecting the pull-back section of the imaging inner core; the middle section pipe is used for protecting the spring pipe of the imaging inner core; the function of the distal tube is to pass through coronary vessels and protect imaging components.

By adopting the technical scheme, the metal core shaft utilizes a metal material as a base material, the external lubricating coating is used as the middle section of the outer sheath pipe of the imaging catheter, and the metal core shaft transmits the pushing force, so that the pushing performance of the catheter can be obviously enhanced. The lubricating coating improves the lubricity and reduces the resistance in the pushing process. The far end of the metal core shaft is provided with a plurality of hollowed-out sections, so that the sections form flexible areas, the metal core shaft can be bent at will, and the shape of the blood vessel is adapted. The connecting component can be a groove or a protrusion, the connecting reliability is improved mainly when the connecting component is connected with the proximal tube and the distal tube, and particularly the connecting component is bonded by adopting an adhesive, so that the bonding difficulty can be reduced, and the bonding strength can be improved.

As the technical scheme of the utility model, the lubricating coating is a PTFE coating.

As the technical scheme of the utility model, at least two sections of PTFE coatings are arranged on the surface of the metal mandrel, and the area between two adjacent sections of PTFE coatings is a non-coating area. Further, the PTFE coating is black or blue. The uncoated region exposes the natural color of the metal mandrel. This uncoated region may serve as a length marker for the sheath.

As a further improvement of the utility model, the hollowing is a spiral cutting hollowing.

As a further improvement of the utility model, the hollowing is a spiral cutting hollowing with equal pitch or gradually changed pitch.

As a further improvement of the utility model, the hollow-out is of a semi-annular cutting structure. Further preferably, the hollow part is a semi-annular cutting structure with an inclination angle.

As a further improvement of the utility model, the spacing between adjacent hollows and the width of the hollows are the same or different.

As a further improvement of the utility model, the connecting member is a groove provided on the metal core shaft.

As a further improvement of the utility model, the groove is an annular groove. Further, the grooves are a plurality of groups of annular grooves.

As a further improvement of the utility model, the grooves are spiral grooves with fixed pitches, spiral grooves with gradually changed pitches, crossed rhombus lattice grooves or irregular point-shaped grooves.

As a further improvement of the present invention, the material of the distal tube and the proximal tube is Polyethylene (PE), polyvinyl chloride (PVC), nylon (PA), Low Density Polyethylene (LDPE), polyether amide elastomer (PEBAX), acrylonitrile-butadiene-styrene polymer (ABS) or Polyoxymethylene (POM).

Compared with the prior art, the utility model has the beneficial effects that:

by adopting the multi-section composite pipe, the base material of the middle-section pipe is made of metal, so that the rigidity of the middle-section pipe is greatly improved, and the pushing force is improved; especially for long or thin tubes. Moreover, compared with a hydrophilic coating, the PTFE super-lubricating coating arranged on the surface of the metal material is more stable in chemical property, is not easy to fall off and lose efficacy, does not need to activate the coating before the operation, and can shorten the preparation time of the operation. In addition, the grooves are formed in the two ends of the middle-section tube, so that the middle-section tube can be conveniently bonded with the near-end tube and the far-end tube, and the bonding difficulty is reduced; the hollow section at the far end forms a flexible structure, so that the catheter can be bent when passing through a blood vessel and a catheter, the bending angle of the blood vessel is adapted, and the blood vessel is not damaged.

Drawings

FIG. 1 is a schematic view of a multi-segment composite tube for use in an imaging catheter in accordance with example 1 of the present invention.

Fig. 2 is a schematic structural view of a middle-stage pipe according to embodiment 1 of the present invention.

Fig. 3 is a schematic view of the structure of the plurality of sets of annular groove portions at the proximal end of the intermediate tube in embodiment 1 of the present invention.

Fig. 4 is a schematic structural diagram of a gradual pitch spiral cutting hollow of the middle-section pipe in embodiment 1 of the present invention.

Fig. 5 is a schematic structural view of a plurality of sets of annular groove portions of a middle-stage pipe according to embodiment 2 of the present invention.

Fig. 6 is a schematic structural view of a plurality of sets of annular groove portions of a middle-stage pipe according to embodiment 3 of the present invention.

FIG. 7 is a schematic structural view of a plurality of sets of annular groove portions of a middle stage pipe according to embodiment 4 of the present invention.

Fig. 8 is a schematic structural view of a hollow part of a middle-stage tube in embodiment 5 of the present invention.

Fig. 9 is a schematic structural view of a hollow part of a middle-stage tube according to embodiment 6 of the present invention.

Fig. 10 is a schematic structural view of a hollow part of a middle-stage tube in embodiment 7 of the present invention.

The reference numerals include:

1-proximal tube, 2-middle tube, 3-distal tube; 4-metal mandrel, 5-PTFE coating, 6-hollowed-out section, 7-annular groove, 8-spiral groove with fixed pitch, 9-spiral groove with gradually changed pitch, 10-crisscross diamond groove and 11-irregular point groove.

Detailed Description

Preferred embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

Example 1

As shown in fig. 1-4, a multi-section composite tube for an imaging catheter comprises a proximal tube 1, a middle tube 2 and a distal tube 3, wherein the middle tube 2 comprises a metal core shaft 4, a PTFE coating 5 is arranged on the surface of the metal core shaft 4, a hollow section 6 containing a spiral cutting hollow is arranged at the distal end of the metal core shaft 4, a connecting member is arranged at the proximal end of the metal core shaft 4, the connecting end of the metal core shaft 4 and the hollow section 6, the connecting member is a plurality of groups of annular grooves 7 in the embodiment, and the metal core shaft 4 is connected with the proximal tube 1 and the distal tube 3 through the plurality of groups of annular grooves 7. Wherein, the function of the proximal tube 1 is to protect the pull-back section of the imaging core; the middle section pipe 2 is used for protecting the spring pipe of the imaging inner core; the function of the distal tube 3 is to pass through coronary vessels and protect imaging components.

The surface of the metal core shaft 4 is provided with at least two sections of PTFE coatings 5, and the area between two adjacent sections of PTFE coatings 5 is a non-coating area. The PTFE coating 5 is black or blue. The uncoated region, which exposes the natural color of the metal mandrel 4, may serve as a length marker for the sheath. In this embodiment, the spiral cutting hollowing is a spiral cutting hollowing with a gradually changing pitch.

The material of distal tube 3 and proximal tube 1 is Polyethylene (PE), polyvinyl chloride (PVC), nylon (PA), Low Density Polyethylene (LDPE), polyether amide elastomer (PEBAX), acrylonitrile-butadiene-styrene polymer (ABS) or Polyoxymethylene (POM).

Adopt the technical scheme of this embodiment, middle section pipe 2 adopts metal dabber 4, for the metal material, and the super lubricating coating of outside attached PTFE has shown the rigidity that has improved middle section pipe 2 to improve the propelling movement power, 5 chemical properties of PTFE coating are more stable moreover, are difficult for droing and become invalid. The hollow-out section 6 of the spiral cutting hollow-out has certain flexibility, can be bent when passing through the blood vessel and the catheter, can well adapt to the bending angle of the blood vessel, and can not damage the blood vessel. The middle section pipe 2 is connected with the near end pipe 1 and the far end pipe 3 through a plurality of groups of annular grooves 7, and the bonding difficulty is reduced.

Example 2

In addition to embodiment 1, as shown in fig. 5, in this embodiment, the connecting member is a spiral groove 8 with a fixed pitch.

Example 3

In addition to embodiment 1, as shown in fig. 6, in this embodiment, the connecting member is a spiral groove 9 with a gradually-changed pitch.

Example 4

In addition to embodiment 1, as shown in fig. 7, in this embodiment, the connecting member is a criss-cross rhombus groove 10.

Example 5

On the basis of embodiment 1, as shown in fig. 8, in this embodiment, the connecting member is an irregular dot-shaped groove 11.

Example 6

Based on embodiment 1, as shown in fig. 9, in this embodiment, the hollow-out section 6 is a semi-annular cutting hollow-out.

Example 7

Based on embodiment 1, as shown in fig. 10, in this embodiment, the hollow-out section 6 is a semi-annular cutting hollow-out section with variable width and spacing.

The above-mentioned embodiments are preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, and the equivalent changes in shape and structure according to the present invention are within the protection scope of the present invention.

Claims (10)

1. A multi-section composite tube for an imaging catheter, comprising: the middle section pipe comprises a metal core shaft, the surface of the metal core shaft is provided with a lubricating coating, the far end of the metal core shaft is provided with a hollow section containing a plurality of hollows, the near end of the metal core shaft, the metal core shaft and the connecting end of the hollow section are provided with connecting members, and the metal core shaft is connected with the near end pipe and the far end pipe through the connecting members respectively.

2. The multi-segment composite tube for an imaging catheter of claim 1, wherein: the lubricating coating is a PTFE coating, at least two sections of PTFE coatings are arranged on the surface of the metal core shaft, and the area between two adjacent sections of PTFE coatings is a non-coating area.

3. The multi-segment composite tube for an imaging catheter of claim 1, wherein: the hollowing is spiral cutting hollowing.

4. The multi-segment composite tube for an imaging catheter of claim 3, wherein: the hollowing is spiral cutting hollowing with equal pitch or gradually changed pitch.

5. The multi-segment composite tube for an imaging catheter of claim 1, wherein: the fretwork is half annular cutting structure.

6. The multi-segment composite tube for an imaging catheter of claim 5, wherein: the space between adjacent hollow parts and the width of the hollow parts are the same or different.

7. The multi-section composite tube for an imaging catheter according to any one of claims 1 to 6, wherein: the connecting component is a groove arranged on the metal mandrel.

8. The multi-segment composite tube for an imaging catheter of claim 7, wherein: the groove is an annular groove.

9. The multi-segment composite tube for an imaging catheter of claim 8, wherein: the grooves are spiral grooves with fixed pitches, spiral grooves with gradually changed pitches, crossed rhombus lattice grooves or irregular point-shaped grooves.

10. The multi-segment composite tube for an imaging catheter of claim 1, wherein: the distal tube and the proximal tube are made of polyethylene, polyvinyl chloride, nylon, polyether amide elastomer, acrylonitrile-butadiene-styrene polymer or polyformaldehyde.

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