Extendable catheter sheath and interventional device conveying device

A catheter and tube wall technology, applied in the field of interventional device delivery devices, can solve the problems of reducing blood vessel protection, calcified plates falling off, and not being able to cover aortic blood vessels, so as to reduce continuous expansion force, eliminate safety hazards, and reduce surgical risks.

Active Publication Date: 2017-03-08
VENUS MEDTECH (HANGZHOU) INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the outer diameter of the introducer sheath is fixed, so it cannot cover the diameter of the inferior vena cava of all patients and the aortic vessel with calcification on the vessel wall, especially the inferior vena cava of patients in China and other Asian countries becomes If it is too small to adapt to the catheter sheath, it will reduce the protection of the blood vessel at the puncture site; even some elderly patients have calcification in the aorta, and the insertion of a large-diameter catheter sheath may cause the calcified plate to fall off
And the introducer sheath is the first device to be put into the blood vessel and the last to be withdrawn. It stays in the blood vessel for a long time. If the large-diameter blood vessel is dilated for a long time, it will easily cause vasospasm, which threatens to increase the chance of surgical complications.

Method used

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  • Extendable catheter sheath and interventional device conveying device
  • Extendable catheter sheath and interventional device conveying device
  • Extendable catheter sheath and interventional device conveying device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] see figure 2 , in this embodiment, the tube wall 4 of the catheter sheath has a rolled wall structure with a coiled cross section, and the tube wall 4 has an expanded state where the rolled wall structure is unfolded at the corresponding position and a predetermined state where the rolled wall structure is restored.

[0066] In the pre-shaped state, the outer diameter of the introducer sheath is 5mm (15Fr), and the inner diameter is 4mm. The inner diameter can reach 8mm (24Fr) in the inflated state, and the sheath can be delivered through the corresponding diameter.

[0067] see image 3 , the distal end of the catheter sheath is equipped with a joint 5 that matches the delivery device, and the connection between the catheter sheath and the joint 5 is wrapped by an elastic sleeve 6 . It can prevent blood (or body fluid) from escaping from the gap of the overlapping part of the pipe wall. The elastic sleeve is made of elastic nylon with a thickness of 0.1-0.2mm.

[...

Embodiment 2

[0077] Such as Figure 8 As shown, although the protruding part 11 and the non-protruding part 12 overlap each other, they are not relatively fixed. They can slide relative to each other to form a gap, so that blood or body fluid may enter and exit the tube wall. In order to be in different states, it can be formed For the closed channel of the interventional device, the present invention provides another embodiment, by setting a flexible envelope on the starting side and the trailing side of the tube wall to seal the tube wall.

[0078] Figure 11 In , the starting side 9 and the trailing side 10 of the tube wall winding are connected by a flexible envelope 14 . The flexible envelope mainly acts as a radial support force, constrains the implanted device, prevents it from being exposed, and at the same time prevents blood or body fluid from overflowing the tube wall.

[0079] The flexible envelope 14 is folded or twisted when the tube wall switches states, so the wall thickn...

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PUM

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Abstract

The invention discloses an extendable catheter sheath and an interventional device conveying device. The extendable catheter sheath comprises a tube wall, the tube wall is in a rolling wall structure, the cross section of the tube wall is in a coiling shape, and the tube wall has an expanding state for expanding the rolling wall structure of the corresponding part and a pre-forming state for automatically recovering the rolling structure. The catheter sheath has a specific cross-section shape, the shape (the cross section) of the catheter sheath is changed on the position, where an interventional device goes by, according to the external size of the interventional device when the interventional device is conveyed, and the catheter sheath is recovered to the original pre-forming state through the self-elasticity after the interventional device passes by, so that the catheter sheath is favorable for penetrating a thinner blood vessel, the falling of a calcification part is avoided, and the risk of the operation is reduced.

Description

technical field [0001] The invention relates to the technical field of interventional instruments, in particular to an introducer sheath and an interventional instrument delivery device using the introducer sheath. Background technique [0002] With the wide application of endovascular interventional therapy in the world, its complications are becoming more and more obvious. Taking interventional aortic valve and pulmonary valve replacement surgery as an example, since the femoral artery or femoral vein needs to be punctured during the operation, and then the delivery sheath loaded with the valve is delivered through the femoral artery or femoral vein, at this time, it needs to be inserted into the inferior vena cava An introducer sheath is first placed at the opening to protect the inferior vena cava. Since the size of the current aortic valve or pulmonary valve delivery sheath is between 16F-24F, direct delivery of the sheath can easily lead to vascular dissection or even...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F2/24
CPCA61F2/2427A61F2/2466A61F2210/00A61F2230/0002A61F2250/0058A61M25/0662A61M2025/0024
Inventor 曾敏
Owner VENUS MEDTECH (HANGZHOU) INC
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