JP6877208B2 - catheter - Google Patents

Description

The present invention relates to a catheter, which does not cause a particularly high cost, causes less pain to a patient, and is less likely to damage a living tissue.

Catheter is inserted into body cavities such as thoracic cavity and abdominal cavity, tubular organs of gastrointestinal tract and ureter, blood vessels, etc., and is used for medical treatment such as drainage of body fluid and injection of drug solution.

In recent years, catheters have become more sophisticated, and balloon catheters for angioplasty used for percutaneous angioplasty that dilates narrowed parts of blood vessels, urinary catheters with temperature sensors that can simultaneously perform urine conduction and bladder temperature measurement, and hearts. Applications have been made such as thermodilution catheters that are placed inside the catheter and used for measuring heart rate output, and catheters for intravascular treatment diagnosis for performing intraarterial infusion therapy and angiography.

By the way, since the catheter is inserted into a body cavity, a tubular organ, a blood vessel, or the like, it is required that there is less pain to the patient and that the living tissue is not damaged.

Conventionally, a catheter has been proposed in which a special material is used to improve the insertability and softness of the catheter, reduce the pain caused to the patient, and make it difficult to damage the living tissue (Patent Document 1).

Further, a catheter having a rounded tip portion and making it difficult to damage a living tissue has been proposed (Patent Document 2 and Patent Document 3).

Japanese Unexamined Patent Publication No. 06-7427 Japanese Unexamined Patent Publication No. 05-237191 Special Table No. 09-500313

However, the catheter described in Patent Document 1 has a problem that the materials that can be used are limited and the cost is high, while the catheter described in Patent Documents 2 and 3 is required to have high shape accuracy and the cost is high.

In view of such a problem, it is an object of the present invention to provide a catheter that does not cause high cost, causes less pain to a patient, and is less likely to damage a living tissue.

Therefore, in the catheter according to the present invention, the tip portion of the main body of the soft tubular body has an annular shape having a cross-sectional outer shape of an arc curved surface, and the annular tip portion has a hollow structure having a communication hole in the outer wall surface, while the hollow structure portion. The flow passage is communicated with the blood passage, and the other end of the flow passage reaches the gel supply means, and the gel is supplied to the hollow structure portion from the communication hole toward the mucous membrane of the patient's body cavity, tubular organ or blood vessel. It is characterized in that it is designed to be discharged or leaked.

One of the features of the present invention is to provide an annular portion having an arcuate curved cross-sectional outer shape at the tip of the main body of the catheter, and the annular portion has a hollow structure, and gel is supplied to this hollow structure portion to provide a body cavity and a tubular shape through a communication hole. The point is that it is discharged or leaked toward the mucous membrane of an organ or blood vessel.
As a result, the arcuate curved surface of the annular portion comes into contact with the mucous membrane of the body cavity, tubular organ or blood vessel, and the gel intervenes between the annular portion and the mucous membrane to make smooth contact, so that the patient is less distressed. Moreover, it is possible to prevent damage to living tissues.
Moreover, it is not necessary to use a special material, a general-purpose soft material may be used, and high shape accuracy is not required, so that the cost is not increased.

Here, the material of the catheter is silicon rubber, polyvinyl chloride, polyethylene, polypropylene, polybutene, fluororesin, polyether polyester, polyether polyamide, polyurethane, polyester, nylon, thermoplastic elastomer, and polymers based on these resins. Alloys or polymer blends can also be used. Further, the gel supply means may have a syringe structure, or a method of supplying the gel by pressing the gel storage portion may be used.

Further, instead of discharging or leaking the gel by the gel supply means or the flow passage, the gel is gradually discharged or leaked by receiving the pressure due to the contact of the annular portion with the mucous membrane of the body cavity, the tubular organ or the blood vessel. However, it has the same effect as above.

In the catheter according to the present invention, the tip portion of the main body of a soft tubular body has an annular shape having an arcuate curved cross-sectional outer shape, and the annular tip portion has a hollow structure having a communication hole on the outer wall surface, while the hollow structure portion has a gel. Is filled and the gel is ejected or leaked from the communication hole into the mucosa of the patient's body cavity, tubular organ or blood vessel under pressure due to the contact of the annular part with the mucosa of the patient's body cavity, tubular organ or blood vessel. It is characterized by being designed to be used.

In addition, the small pressure upon contact with the mucosa of the body cavity, tubular organ or blood vessel causes the hollow annular portion to elastically deform, reducing the pain on the mucosa of the body cavity, tubular organ or blood vessel of the patient and damaging the living tissue. It can be difficult.

In the catheter according to the present invention, when the tip portion of the main body of a soft tubular body has an annular shape having an arcuate curved cross-sectional outer shape and the annular portion has a hollow structure and is in contact with the mucous membrane of a patient's body cavity, tubular organ or blood vessel. It is characterized in that it is elastically deformed by the pressure of the above and the contact pressure is reduced.

It is sectional drawing which shows the preferable embodiment of the catheter which concerns on this invention. It is a figure which shows the vertical section (a) and the front surface (b) in the said embodiment. It is sectional drawing which shows the 2nd Embodiment. It is a figure which shows the state before use (a) and after use (b) in a third embodiment. It is sectional drawing which shows 4th Embodiment.

Hereinafter, the present invention will be described in detail based on specific examples shown in the drawings. 1 and 2 show preferred embodiments of the catheter according to the present invention. In the figure, the main body 10 of the catheter is manufactured in a circular tubular shape using a soft material such as silicon rubber, and the tip portion 10A of the main body 10 is formed in an annular shape having a cross-sectional outer shape of an arc curved surface.

The annular tip portion 10A has a hollow structure, and a plurality of small-diameter communication holes 10B are formed in the outer wall surface thereof. Further, a flow passage 11 is communicated with the hollow structure portion 10C, a syringe (gel supply means) 12 is connected to the other end side of the flow passage 11, and a gel is formed in the syringe 12, the flow passage 11, and the annular tip portion 10A. 15 is filled, and by operating the syringe 12, the gel 15 is supplied into the annular tip portion 10A, and is discharged or leaked from the communication hole.

When inserting the catheter into the body cavity, tubular organ or blood vessel, the catheter is inserted into the body cavity, tubular organ or blood vessel while operating the syringe 12. Then, the gel 15 is discharged or leaked from the communication hole 10B of the annular tip portion 10A of the catheter body 10 toward the mucous membrane of the body cavity, tubular organ or blood vessel, and the gel 15 is discharged between the mucosa and the annular tip portion 10A of the catheter. It will be intervened.

As a result, the annular tip portion 10A having an arcuate curved surface is in contact with the mucous membrane of the body cavity, tubular organ or blood vessel, and the gel 15 is interposed between the annular tip portion 10A and the mucous membrane to make smooth contact. Therefore, there is less pain to the patient, and the living tissue can be less likely to be damaged.

Moreover, it is not necessary to use a special material, a general-purpose soft material may be used, and high shape accuracy is not required, so that the cost is not increased.

FIG. 3 shows a second embodiment, in which the same reference numerals as those in FIGS. 1 and 2 indicate the same or corresponding parts. In this example, a hollow bulging portion 14 is formed on the other end side of the catheter main body 10 as a gel supply means, a flow passage 13 is formed in the outer wall of the catheter main body 10, and the flow passage 13 is hollow bulged. The hollow portion of the portion 14 and the hollow structure portion of the annular tip portion 10A of the catheter body 10 are communicated with each other, and the hollow bulging portion 14, the flow passage 13, and the annular tip portion 10A of the catheter body 10 are filled with gel 15. A cap 16 for closing the communication hole 10B is fitted in the hollow structure portion, the cap 16 is removed, and the gel 15 is discharged or leaked from the communication hole 10B in the hollow structure portion by pushing the hollow bulging portion 14. It has become.

FIG. 4 shows a third embodiment. In the figure, the same reference numerals as those in FIGS. 1 to 3 indicate the same or corresponding parts. In this example, as shown in FIG. 4A, the tip portion 10A of the catheter body 10 is formed in an annular shape having a cross-sectional outer shape of an arc curved surface, the annular tip portion 10A has a hollow structure, and a plurality of annular tip portions 10A are formed on the outer wall surface thereof. The small-diameter communication hole 10B is bored, and the hollow structure portion of the annular tip portion 10A is filled with gel 15, while the annular tip portion 10A is fitted with a cap 16 for closing the communication hole 10B.

When the cap 16 is removed and the catheter body 10 is inserted into the body cavity, tubular organ or blood vessel, the annular tip portion 10A of the catheter body 10 comes into contact with the body cavity, tubular organ or blood vessel mucosa and receives pressure, which is shown in FIG. As shown in 4 (b), the gel 15 is discharged or leaked from the communication hole 10B toward the mucosa of the body cavity, tubular organ or blood vessel, and the gel 15 is interposed between the mucosa and the annular tip portion 10A of the catheter. The Rukoto.

FIG. 5 shows a fourth embodiment. In the figure, the same reference numerals as those in FIGS. 1 to 4 indicate the same or corresponding parts. In this example, the tip portion 10A of the catheter body 10 is formed in an annular shape having an arcuate curved cross-sectional outer shape, the annular tip portion 10A has a hollow structure, and the catheter body 10 is inserted into a body cavity, a tubular organ, or a blood vessel. Then, when the annular tip portion 10A of the catheter body 10 comes into contact with the mucous membrane of the body cavity, tubular organ, or blood vessel and receives pressure, the annular tip portion 10A elastically deforms to absorb or reduce the pressure.

As a result, the annular tip portion 10A of the circular arc curved surface in the cross section comes into contact with the mucous membrane of the body cavity, the tubular organ or the blood vessel, and the annular tip portion 10A absorbs and reduces the contact pressure, so that the patient is less distressed. Moreover, it can make it difficult to damage the living tissue.

10 Catheter body 10A Circular tip part 10B Communication hole 11, 13 Flow passage 12 Syringe (gel supply means)
14 Swelling part (gel supply means)
15 gel

Claims (1)

The tip portion (10A) of the soft tubular body (10) forms an annular shape having a cross-sectional outer shape of an arc curved surface, and the annular tip portion (10A) forms a hollow structure having a communication hole on the outer wall surface, while the hollow structure portion. Is filled with gel (15), and the gel is pressed from the communication hole (10B) through the communication hole (10B) to the patient's body cavity under pressure due to the contact of the annular tip portion (10A) with the mucous membrane of the patient's body cavity, tubular organ or blood vessel. A catheter characterized in that it is designed to be discharged or leaked toward the mucous membrane of a tubular organ or blood vessel.

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