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Double balloon catheter stent

A catheter stent and double-balloon technology, applied in the field of urethral stents, can solve problems affecting catheter safety, high wettability, and rough catheters

Inactive Publication Date: 2017-06-13
COMSCAFFOLDS NANJING MEDICAL DEVICE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (2) There will be different degrees of granulation tissue and epithelial hyperplasia in the frame after the stent is implanted;
[0013] European patent 0586324A1 introduces a method for preparing a hydrophilic coating that can reduce friction on the surface of medical appliances. In addition to containing adhesive polymers and hydrophilic polymers, an inorganic compound is also added to the hydrophilic coating, such as NaCl, the purpose is to increase the osmotic pressure of the coating, but the defect of this coating is that NaCl is difficult to dissolve in organic solvents, and exists on the surface of the catheter in the form of a suspension, and the resulting catheter looks rough and has poor visual perception
[0014] US Patent 6221425B1 introduces a hydrophilic coating that can be used for medical devices, which requires two reactions. First, a layer of polymerizable monomer solution is coated on the surface of the catheter, polymerized by a certain reaction, and then coated. A layer of hydrophilic polymer, after drying to obtain a hydrophilic coating, this method is relatively easy to form some residual monomers that are not easy to remove, affecting the safety of the catheter
[0015] Chinese invention patent CN100591389C is to apply silica gel coating directly on the outside of the catheter. Although the silica gel coating has been carried out twice in the patent, the lubricating effect is improved compared with ordinary balloon catheters, but it is far less than that used in this patent. Biomacromolecule Synthetic polymers combined with silane coupling agents have high wettability, and these polymers are degradable, even if there are some residues, they will not cause unnecessary secondary damage to the body
[0016] Chinese invention patent CN1029087123, although a polymer lubricating layer is used, but the polymer selected is polyvinylpyrrolidone with different K values, which is not bonded by a coupling agent, and the stability of the formed film is relatively weak
[0017] Chinese invention patent CN 102166377 A relates to a composition of lubricating hydrophilic coating for medical catheters. The composition is composed of acetal polymer, hydrophilic polymer and citric acid ester plasticizer. The coating formed by the reaction is easy to form some small molecules, which is a potential biological hazard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1: Urethral stent supported by double balloons

[0043] Made of silicone material such as figure 1 For the double-balloon urinary catheter shown, the stent is pressed or adhered to the columnar balloon. After the catheter is placed in the urethra, it is inserted into the positioning balloon 5 through the positioning balloon inflation catheter connector 1 and the positioning balloon inflation catheter 2. Inflate, the positioning balloon 5 is fixed, and then inflate the inner balloon 4 of the columnar balloon through the columnar balloon inflation catheter joint 6 and the columnar balloon inflation catheter 7, and the outer layer balloon 9 of the columnar balloon will hold the urethral stent 8 is stretched, supported on the urethra, and the two positioning balloons 5 and the inner balloon 4 of the columnar balloon are deflated and withdrawn, which completes the placement of the stent.

[0044] The preparation process is as follows:

[0045] (1) Weave, engrave, e...

Embodiment 2

[0050] Example 2: Double balloon catheter covered urethral stent

[0051] Made of latex material such as figure 1 The shown double-balloon urinary catheter is equipped with a covered urethral stent, and its preparation process is as follows:

[0052] (1) Carve, etch or cut the degradable metal material into the desired pattern or lath shape (public information can be searched), the diameter of the bracket is 3mm, and the length is 2cm;

[0053] (2) Dissolving the degradable medical polyurethane material in dichloromethane solvent, and spreading it into a film with a thickness of 0.2-0.3mm on the tetrafluoroethylene board;

[0054] (3) roll the film prepared in step (2) on the surface of the metal stent metal material prepared in step (1) to make a coated stent, and spray the surface with 3% concentration of silane coupling agent KH560 ethanol solution;

[0055] (4) The composite material prepared in step (3) is dipped or sprayed with a hydrophilic coating (1% PVA aqueous sol...

Embodiment 3

[0058] Example 3: Double-balloon urinary catheter hybrid coated urethral metal stent

[0059](1) Prepare 2% sodium hyaluronate (HA) solution, stir for 12 hours to make it fully swell, and store it at room temperature for later use. Prepare polyvinylpyrrolidone (K90-PVP) at a concentration of 6%, heat and swell in a 90° hot water bath for 4 hours, mix hyaluronic acid and polyvinyl alcohol according to HA:PVP=3:1, silane Add the final concentration of the joint agent KH560 to 4.0%, stir for 4 minutes, and degas under reduced pressure to obtain a white viscous film solution. Immerse the clean and smooth glass slide and catheter in the film solution at the same time, take it out after 2 hours, and put it in the oven. Dry at 70°C to form a film.

[0060] (2) Weave, engrave, etch or cut the metal material (stainless steel) into the required pattern (public information can be searched), the diameter of the bracket is 3mm, and the length is 2cm;

[0061] (3) The metal stent prepared...

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Abstract

The invention discloses a double-balloon catheter stent, which is composed of a positioning balloon and a columnar balloon, wherein the columnar balloon is a double-layer balloon, the inner layer balloon is made of a material with a pressure greater than 0.5MPa, and the outer layer balloon The material is one of soft polyurethane, latex or silica gel, the surface of the columnar balloon is equipped with a stent, and the surface of the stent is coated with a hydrophilic coating material. The invention is used for placing a bracket in a lumen, and is especially suitable for placing a bracket in the urethra in urology as a temporary support for patients with dysuria, replacing a urinary catheter.

Description

technical field [0001] The invention belongs to the field of medical biomaterials and technology, and in particular relates to a double balloon and a urethral support supported by the same. Background technique [0002] Lumen stents are divided into permanent stents and temporary stents according to the patient's condition. Temporary stents play a supporting role in the urinary tract rather than embedded in the urethral wall. They are divided into metal stents and absorbable biodegradable stents, which are developed in recent years. The temporary scaffold is composed of polymer glycolic acid (PGA) or lactic acid polymer (PLA). It has the characteristics of good tissue compatibility, small inflammatory response, low infection rate, no crystals on the surface, and no need to take out or replace. However, the method of stent placement is mostly surgical placement, with large wounds and long recovery time for patients. The double-balloon catheter used in the present invention c...

Claims

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Application Information

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IPC IPC(8): A61F2/958A61L31/02A61L31/10A61L31/18
CPCA61F2/958A61L31/022A61L31/10A61L31/18A61L2420/02A61L2420/06
Inventor 薛波新张文芳
Owner COMSCAFFOLDS NANJING MEDICAL DEVICE CO LTD
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