CN1146450C - Medical catheter - Google Patents
Medical catheter Download PDFInfo
- Publication number
- CN1146450C CN1146450C CNB971193282A CN97119328A CN1146450C CN 1146450 C CN1146450 C CN 1146450C CN B971193282 A CNB971193282 A CN B971193282A CN 97119328 A CN97119328 A CN 97119328A CN 1146450 C CN1146450 C CN 1146450C
- Authority
- CN
- China
- Prior art keywords
- medical catheter
- catheter
- conduit
- end portion
- tip portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Materials For Medical Uses (AREA)
Abstract
The present invention provides a medical catheter. When the medical catheter is bent, the tip of the medical catheter is softer than the tail end of the operator side. The present invention aims at providing a catheter which can be easily introduced into expected parts. The medical catheter of the present invention is particularly suitable for the treatment of constriction of blood vessel or the constriction of cardiac valves.
Description
Technical field
The present invention relates to a kind of medical catheter, particularly a kind of conduit that inserts heart or blood vessel.
Background technology
Medical catheter inserts in the blood vessel, and inwardly pushes along blood vessel, makes its tip portion arrive the expection position.Then, will inject such as the chemical substance of contrast medium or medicine by this conduit.Just have the conduit of sacculus at its tip portion, be that its sacculus part is pressed into angiostenosis place or valvular stenosis place by force, and it is expanded to expand narrow treatment.In this way, must medical catheter be inserted so that its most advanced and sophisticated expection position that arrives through blood vessel.But, there are the blood vessel of damage or peripheral blood vessel to be everlasting and little bending arranged in the three dimensions, often be difficult to make the tip portion of conduit to arrive the expection position.If firmly conduit is inserted along the part of a bending, the tip portion of conduit may injured blood vessel wall or wall of the heart so.And, with regard to a kind of conduit that is used for the treatment of narrow valvular dribbling capsule, normally a prefabricated metal stylet is inserted the inner chamber of foley's tube, so that sacculus is inserted in the stenosed valve it is opened.The medical catheter that is used for this purpose must be soft enough in its body portion, but in order to push conduit, make the tip portion of its conduit insert the expection position, also in order to rotate it, the end portion of operator's one side of this conduit must be again hard to a certain extent.
Summary of the invention
The present invention has improved to satisfy these requirements.The object of the present invention is to provide a kind of conduit, it is soft that its tip portion keeps, and the end portion of its operator's one side is harder than its tip portion.
For achieving the above object, the invention provides a kind of medical catheter, when it was crooked, its tip portion was more soft than its end portion.Should be when bending being preferably of more softish partial-length: from tip 5～40cm, and the flexible rigidity at this more soft place of tip portion of being estimated by Tinius Olsen rigidimeter when bending is the moment of flexure of 10g.cm～100g.cm.
A most preferred embodiment of the present invention is a medical catheter of being made by polymer, and this polymer comprises polrvinyl chloride or polyvinylidene chloride.This kind polymer contains flexibility agent, and wherein the flexibility agent content in this catheter tip part is less than the content in soft more.
Another most preferred embodiment of the present invention is a conduit, wherein is provided with a sacculus at its tip portion.
The present invention also has a most preferred embodiment, i.e. conduit, and it is used for the treatment of the narrow or valvular narrow of blood vessel.
A kind of best approach that is used to make conduit of the present invention is, makes catheter tube with the flexible material that contains flexibility agent, and the end portion at conduit extracts a certain amount of flexibility agent with a kind of solvent then.Preferably reduce the flexibility agent of about 30～75wt%.
Description of drawings
Fig. 1 has represented an example of conduit of the present invention.
Fig. 2 has represented an example of foley's tube.
The implication of each symbol:
1: catheter tube
2: adapter
3: sacculus
4: catheter tube
5: adapter
The specific embodiment
Usually have lessly relatively when crooked when blood vessel, can run into the very difficult situation of medical catheter being inserted this blood vessel.And, if in case successfully its tip portion is inserted the so common insertion operation that just can relatively successfully carry out subsequently.Therefore, in the present invention, the length of the most advanced and sophisticated soft of conduit is preferably from tip 5cm～40cm (though being not limited to this scope).In addition, the flexible degree of this tip portion that is recorded by Tinius Olsen rigidimeter when bending is preferably the moment of flexure (though being not limited to this scope) of 10～100g.cm.On the other hand, the length of the end portion of operator's one side of conduit is preferably 20～110cm (though it also is not limited to this scope), in case this is because the tip portion of conduit has successfully passed through after the narrow or sweep of blood vessel, just can relatively easily conduit be pushed, if and this soft is oversize, will reduce the ability of pushing, make pushing of conduit become difficult.This flexible degree is preferably 1kg.cm or more.
The most advanced and sophisticated soft of making conduit has method not of the same race.Representative method comprises: connect the body with different flexible degree, tip portion is made thin-walled, the end portion of catheter steering person one side is strengthened as body with a kind of flexible material, flexibility agent in the end portion of person's one side that also available a kind of flexible material will reduce the catheter steering as body, so that the flexibility agent content in the catheter tip part still less, thereby strengthen hardness of catheter tip part or the like.
In order to connect the body of different hardness,, can use polyurethanes, polyethylene etc. as soft material such as using polyamide, politef, polypropylene etc. as hard material.
As for the difference of thickness when tip portion is made thin-walled, preferably the thickness of the part that will approach remain on thick part thickness 70～80%.
In order to do on the inner surface of catheter tip part with a kind of flexible material or on the outer surface or the body of an enhancement Layer arranged on the tube wall, such as stainless steel silk only being used for the end portion of reinforced tube.
When with a kind of flexible material that contains flexibility agent during as body, the end portion that is preferably in operator's one side of conduit extracts a certain amount of flexibility agent with a kind of solvent.Preferably this kind flexibility agent is reduced about 30～75%.
Preferably employed conduit of the present invention is equipped with a sacculus at its tip portion, and this sacculus can be made by polyester, polyamide, polyethylene or rubber etc.
Embodiment to conduit of the present invention is described hereinafter with reference to accompanying drawing.Fig. 1 has represented that one will be inserted into heart or blood vessel so that inject the utility conduit of materials such as chemical solution.Symbol 1 is represented a catheter tube and 2 is represented an adapter.Fig. 2 has represented a foley's tube, its sacculus is inserted the narrow or the valvular narrow of blood vessel, so that treat by dilatation balloon.Sacculus of symbol 3 expressions, catheter tube of symbol 4 expressions, and adapter of symbol 5 expressions.The tip portion of this catheter tube is softish.
Conduit of the present invention preferably is used for treating blood vessel or valvular illness such as narrow.
Embodiment 1
In a foley's tube (Fig. 2), wherein be provided with the DLC body that a PVC interior tube body that comprises hollow polrvinyl chloride (PVC) outer tube body and and the coaxial setting of outer tube body hollow space constitutes, tip portion at this DLC body has a sacculus, end portion in its operator's one side has an adapter, these two end portion in its operator's one side beyond the about 10～20cm of tip portion of outer tube body and interior tube body all extracts their flexibility agent so that its sclerosis with methanol.
Outer tube body was extracted about 6 hours down at 60 ℃, dry then, and then further handled 6 hours down, and interior tube body was extracted its flexibility agent about 3 hours down at 60 ℃ at 60 ℃, to remove about 60% flexibility agent, make the foley's tube made end portion than it tip portion more firmly.The tip portion of conduit has the suitable flexible degree 40g.cm that is about of Tinius Olsen rigidimeter estimation (when the bending by), and so that conduit is pushed heart or blood vessel, (1.0～2.0kg.cm) so that control lead and its end portion has enough hardness.
The present invention can provide a kind of conduit, and its tip portion keeps the end portion of soft and its operator's one side harder than tip portion, therefore can be introduced into the expection position at an easy rate.
Claims (8)
1, a kind of medical catheter, when it is crooked, its tip portion is more soft than the end portion of its operator's one side, and the flexible rigidity at this more soft place of tip portion that is recorded by Tinius Olsen rigidimeter when bending is the moment of flexure of 10gcm～100gcm, is provided with a sacculus at its tip portion.
2, a kind of according to the described medical catheter of claim 1, should when bending, more softish partial-length be wherein from tip 5～40cm.
3, a kind of according to the described medical catheter of claim 1, wherein be connected with the conduit of different hardness.
4, a kind of according to the described medical catheter of claim 1, wherein the thickness of the wall of catheter tip part is thinner than the thickness of the wall of the end portion of operator's one side.
5, a kind of according to the described medical catheter of claim 1, an enhancement Layer is wherein arranged on inner surface of tube body or outer surface or wall.
6, a kind of medical catheter of making by the polymer that contains flexibility agent according to claim 1, wherein the flexibility agent content in the end portion of its operator's one side than its more the content in the soft lack.
7, a kind of according to the described medical catheter of claim 1, wherein it is to be made by polrvinyl chloride or polyvinylidene chloride.
8, a kind of method of making the medical catheter of claim 1 wherein prepares a catheter tube of being made by the flexible material that contains flexibility agent, and in the end portion of operator's one side of conduit with a certain amount of flexibility agent of a kind of solvent extraction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB971193282A CN1146450C (en) | 1997-08-26 | 1997-08-26 | Medical catheter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB971193282A CN1146450C (en) | 1997-08-26 | 1997-08-26 | Medical catheter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1209342A CN1209342A (en) | 1999-03-03 |
| CN1146450C true CN1146450C (en) | 2004-04-21 |
Family
ID=5175320
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB971193282A Expired - Lifetime CN1146450C (en) | 1997-08-26 | 1997-08-26 | Medical catheter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1146450C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3419528B1 (en) * | 2016-02-24 | 2023-06-07 | Incept, LLC | Enhanced flexibility neurovascular catheter |
-
1997
- 1997-08-26 CN CNB971193282A patent/CN1146450C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CN1209342A (en) | 1999-03-03 |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| REG | Reference to a national code |
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Granted publication date: 20040421 |