JP6260929B2 - Nasal catheter - Google Patents

Description

  The present invention relates to a medical tube used for enteral nutrition, administration of a drug solution, and the like, and a nasal catheter that holds a weight by the medical tube.

  2. Description of the Related Art Conventionally, drugs or infusions and nutrients in enteral nutrition are administered through, for example, a medical tube that is inserted and placed in advance in a patient's body. This medical tube may be inserted into the body through a hole formed for insertion by puncture of a blood vessel or construction of a fistula, such as central parenteral nutrition or enteral nutrition by gastrostomy or intestinal fistula. However, for example, as disclosed in Japanese Patent Application Laid-Open No. 2003-164517 (Patent Document 1), it may be inserted into the body through the patient's nasal cavity or oral cavity.

  By the way, when the medical tube is inserted into the patient's body nasally or orally, it is desirable that the outer diameter of the medical tube is small in order to reduce nausea and pain at the time of insertion.

  However, if the diameter of the entire medical tube is simply reduced, not only the outer diameter dimension but also the inner diameter dimension becomes small, so that the flow rate of nutrients and drug solutions may be reduced, and a long time may be required for administration. In particular, when a high-viscosity nutrient or the like is administered, the flow resistance is increased by reducing the diameter, which makes it more difficult to efficiently administer.

  On the other hand, if only the outer diameter dimension is reduced while maintaining the inner diameter dimension of the medical tube, the peripheral wall of the medical tube becomes thin and the stability of the shape is lowered, which may make it difficult to insert into the body. In addition, when flowing a high-viscosity nutrient or the like under pressure, the flow rate may become unstable or the medical tube may be damaged due to the diameter expansion of the medical tube.

  The medical tube is not only used to configure a flow path for administering a drug or a nutrient, but can be used, for example, to hold a weight at the distal end of a nasal catheter. The medical tube for nasal catheters has both a small outer diameter and a large inner diameter in order to efficiently accommodate and hold the weight with a short length while maintaining ease of insertion into the body. In addition to this, it is required to have durability that can stably accommodate and hold the weight. And since stress tends to concentrate on the adhering part of the proximal end of a medical tube and the distal end of a catheter main body, it is also necessary to ensure sufficient adhering strength in the said part.

JP 2003-164517 A

  The present invention has been made in the background of the above-described circumstances, and the problem to be solved is that it is possible to obtain a large inner diameter with a relatively small outer diameter, and to improve the shape stability and durability of the peripheral wall. It is another object of the present invention to provide a medical tube having a novel structure that is excellent in that the post-processing of the cut end can be easily and advantageously realized.

  Another object of the present invention is to provide a nasal catheter having a novel structure that can stably hold and hold a weight by using the medical tube as described above.

  Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible.

A feature of the present invention is that a mesh-like reinforcing body made of a thermoplastic resin wire is disposed on a flexible thermoplastic resin tubular body, and the tubular body is the reinforcing body. And a medical tube having a predetermined length by being cut at a circumferential cutting surface, and the medical tube is inserted nasally into a patient's body to administer a nutrient or drug. The distal end of the medical tube is closed by being plastically deformed by post-processing by heating the cut end of the tubular body and the reinforcing body. And the proximal end of the medical tube is closed by extrapolating to the port member located at the distal end of the catheter body by post-processing to the cut end of the tubular body and the reinforcing body. And both ends are closed A weight is housed and disposed in the lumen of the medical tube, and the proximal end of the medical tube that is externally fixed to the port member is applied to a stepped surface formed on the outer peripheral surface of the port member. And a longitudinally-positioned, hollow shaft connected to the proximal end of the port member, the port member being in communication with a lumen of the shaft and intermediate portion of the port member The nasal catheter has a side hole that is curved and opened on the outer peripheral surface.
According to the nasal catheter of the present invention, since the medical tube that accommodates the weight has a structure in which the reinforcing body is fixed to the tubular body, the flexible tubular body provided at the distal end of the nasal catheter should be used. Even if it breaks, the weight can be prevented from falling off by the reinforcing body, and excellent safety is exhibited.
Furthermore, since the tubular body is reinforced by the reinforcing body, the shape stability can be sufficiently obtained even when the inner diameter is increased without increasing the outer diameter of the tubular body. Easy insertion into the body. In addition, since a large inner diameter is ensured, a large-diameter weight can be accommodated, and a sufficient weight can be accommodated with a short length.
Further, since the reinforcing body fixed to the tubular body is made of synthetic resin, the length of the reinforcing body protruding from the cut surface of the tubular body is reduced, and the proximal end of the medical tube and the catheter body are It is possible to prevent the fixation with the distal end from being inhibited by the reinforcing body. In particular, since a sufficient fixing strength is obtained at the fixing portion between the medical tube and the catheter body where stress is likely to concentrate, the problem that the medical tube falls off the catheter body can be avoided more advantageously.
Further, since the reinforcing body is made of synthetic resin, durability against deformation such as bending can be advantageously obtained as compared with the case where the reinforcing body is made of metal.
Furthermore, according to this aspect, since the reinforcing body is made of a synthetic resin and the post-processing of the cut end is easy, the post-processing such as heating after cutting the tubular body and the reinforcing body is also performed. By being plastically deformed by this, it can be easily closed in a predetermined shape.
In addition, the said medical tube in this invention contains the following aspects.
Specifically, a first aspect of the present invention is a medical tubing, a tubular body made of synthetic resin having a flexible, reinforced structure that comprises a wire made of synthetic resin is disposed, the The tubular body is cut together with the reinforcing body at a circumferential cutting surface to have a predetermined length, and at least one of the tubular body and the cut end of the reinforcing body is post-processed, To do.

  According to the medical tube having the structure according to the first aspect as described above, the peripheral wall of the tubular body is reinforced by the reinforcing body, thereby ensuring sufficient shape stability even if the tubular body is thin. . Therefore, even if the inner diameter is increased while maintaining the outer diameter to ensure a large flow rate, excellent operability is exhibited when inserting the medical tube into the patient's body, and nutrients and drugs Even when pressure is applied, the expansion of the diameter of the medical tube is suppressed, so that the flow rate can be stabilized.

  Furthermore, since the reinforcing body is made of a resin wire, characteristics close to that of a tubular body can be set as compared with the case where the reinforcing body is made of a metal wire or the like. Specifically, both the tubular body and the reinforcing body are made of synthetic resin, so that physical properties such as elasticity, rigidity, and linear expansion coefficient of both can be set close to each other. Therefore, when the tubular body is cut together with the reinforcing body, the metal wire material such as a wire protrudes from the tubular body to the outside at the cutting end face as the binding force is released by cutting, or the tubular body is expanded in diameter. However, by adopting a reinforcing body made of a resin wire, it is possible to effectively avoid such a problem. In addition, when post-processing is performed on the cut end of the tubular body, the reinforcement body, which is also made of a synthetic resin, is subjected to a treatment such as deformation, cutting, polishing, cutting, etc. integrally with the tubular body, thereby achieving the target medical treatment. It is also possible to easily and accurately perform post-processing on the cut end of the tube.

  In addition, since both the tubular body and the reinforcing body constituting the medical tube having the composite structure are made of synthetic resin, compared with the case where a metal reinforcing body is employed, heating, adhesion, etc. Residual stress generated due to a difference in thermal shrinkage between the tubular body and the reinforcing body after the manufacturing or post-processing with the treatment can be reduced. Therefore, excellent durability and flexibility in the medical tube can be obtained more effectively.

  In addition, since the reinforcing body is made of resin, the familiarity with the close contact surface with respect to a similar tubular body made of resin is considered good and firmly fixed as compared with the case where a metal reinforcing body is adopted. Unlike a metal reinforcing body that is significantly stronger and more rigid than a resin tubular body, the tubular body and the reinforcing body are integrated to provide the strength and rigidity of the entire medical tube. Improvement can be achieved. Therefore, excellent operability can be exhibited, for example, by improving the pushability when operating a medical tube, etc., and even when it is repeatedly deformed, it is not a local bending deformation like a metal reinforcement body, but the whole Combined with the occurrence of typical bending deformation, fatigue failure due to repeated deformation can be effectively avoided and excellent durability can be exhibited. For example, a medical tube can be placed over a long period of time. Thus, high reliability is achieved even when a nutrient or drug is repeatedly administered.

  According to a second aspect of the present invention, in the medical tube described in the first aspect, the tubular body and the reinforcing body are each formed of a thermoplastic resin, and the cutting of the tubular body and the reinforcing body is performed. The end is subjected to post-processing by heating.

  According to the second aspect, since the tubular body and the reinforcing body are each formed of a thermoplastic resin, the cut ends of the tubular body and the reinforcing body are heated and melted, and then cooled and plastically deformed. The cut end can be deformed into a predetermined shape, or the cut end can be fixed to another member by welding. Moreover, the reinforcing body protruding from the cut surface of the tubular body is heated and melted and integrated with the tubular body, so that the tubular body and the reinforcing body are more firmly fixed, and the unevenness of the cut surface is reduced, and the hub is reduced. Also, it can be easily fixed to other members such as a connector.

  According to a third aspect of the present invention, in the medical tube described in the first or second aspect, another member is fixed to the cut end of the tubular body and the reinforcing body by post-processing. is there.

  According to the 3rd aspect, compared with the case where a metal reinforcement body is employ | adopted, it becomes possible to obtain the adhering force of another member more stably. Specifically, it is possible to suppress the protrusion amount of the reinforcing body from the cut surface of the tubular body to be smaller than that of the metal reinforcing body, and protrude from the cut surface when the other member is fixed to the medical tube. It is possible to prevent the reinforcing body from interfering and increase the fixing strength between the tubular body and the other member. In addition, when bonding or welding other members to the cut end of the medical tube, the reinforcement is made of resin, so that the end of the reinforcement protruding from the cut surface or the cut surface The exposed end face of the reinforcing body can also be bonded or welded to other members together with the tubular body, so that firm fixation can be realized. Furthermore, when other members are fixed to the cut end portion of the medical tube by press-fitting or the like, the tubular body and the reinforcing body are both made of synthetic resin, and properties such as rigidity and elasticity can be set close to each other. Therefore, the press-fit fixing force is distributed substantially evenly over substantially the entire press-fitting site, and it is possible to stably obtain a large fixing force as a whole, as in the case of employing a metal reinforcement. A problem that a large pressure acts locally on the tubular body and a crack or the like easily occurs is avoided, and good durability can be realized.

  According to a fourth aspect of the present invention, in the medical tube described in any one of the first to third aspects, the tubular body includes an inner layer and an outer layer, and the reinforcement is provided between the inner layer and the outer layer. The body is arranged.

  According to the fourth aspect, the reinforcing body can be easily disposed inside the tubular body by sandwiching the reinforcing body between the inner layer and the outer layer, and the dropout of the reinforcing body can be avoided more advantageously. At the same time, it is possible to prevent unevenness due to the reinforcing body from being formed on the inner peripheral surface and outer peripheral surface of the medical tube, and it is possible to prevent an increase in fluid friction such as hooking and chemicals during handling.

  According to a fifth aspect of the present invention, in the medical tube described in any one of the first to fourth aspects, the reinforcing body has a mesh shape.

  According to the 5th aspect, a tubular body can be efficiently reinforced by setting it as the mesh shape which combined the some resin wire. In addition, the tubular body can be more efficiently reinforced than the coil-like reinforcing body while sufficiently ensuring the flexibility (flexibility) of the medical tube. Note that the mesh structure can be advantageously realized by, for example, combining or braiding a plurality of resin wires of the same type or different types in a mesh shape. And according to such a mesh structure, even when a crack occurs in the tubular body, it is possible to suppress the leakage and intrusion inside and outside the tube by reducing the size of the opening generated in the medical tube. .

  According to a sixth aspect of the present invention, in the medical tube described in any one of the first to fifth aspects, the tubular body includes a plurality of lumens extending in the length direction. .

  According to the sixth aspect, by applying the present invention to a medical tube having a structure in which the lumen is divided into a plurality of portions, in the medical tube in which the flow rate tends to be relatively small due to the partition wall that divides the lumen. It becomes possible to obtain a large flow rate in each lumen. In particular, if a structure in which the peripheral wall of the tubular body is reinforced and no reinforcing body is provided for the partition wall, the sectional area of the lumen is increased by the thin partition wall while ensuring the deformation stability of the entire medical tube. It can be set and the flow rate can be obtained efficiently.

  According to a seventh aspect of the present invention, in the medical tube described in any one of the first to sixth aspects, the tubular body and the reinforcing body administer a nutrient or drug into a patient's body. The catheter is constructed.

  According to the seventh aspect, the required performance can be efficiently realized by applying the present invention to a tube feeding or dosing catheter that easily requires a large flow rate while keeping the outer diameter dimension small. Therefore, administration of a nutrient or drug in a short time can be realized.

  According to the present invention, by fixing the reinforcing body to the tubular body, sufficient shape stability and pushability can be exhibited even if the tubular body is thinned. Therefore, the inner diameter dimension can be increased without increasing the outer diameter dimension. It is possible to cope with the fact that the flow rate of nutrients or medicines administered through the lumen can be increased by setting it large. Further, since both the tubular body and the reinforcing body are made of a synthetic resin, it becomes possible to integrally process them at the cut end portion of the medical tube. Therefore, even when post-processing such as press-fitting, bonding, or welding is performed on the cut end portion of the medical tube, the same processing can be simultaneously applied to both the tubular body and the reinforcing body. As a result, both the tubular body and the reinforcing body are substantially integrated so that an excellent fixing force as a whole can be easily obtained.

The perspective view which shows the medical tube as 1st embodiment of this invention. II-II sectional drawing of FIG. It is a perspective view which expands and shows the edge part of the medical tube shown in FIG. 1, Comprising: The figure which shows the state before a cutting | disconnection. It is a perspective view which expands and shows the edge part of the medical tube shown in FIG. 1, Comprising: The figure which shows the state after a cutting | disconnection and before a post-process. It is a perspective view which expands and shows the edge part of the medical tube shown in FIG. 1, Comprising: The figure which shows the state after post-processing. It is a perspective view which expands and shows the edge part of the medical tube shown in FIG. 1, Comprising: The figure which shows the state which performed another post-process. It is a perspective view which expands and shows the edge part of the medical tube as another one Embodiment of this invention, Comprising: The figure which shows the state after post-processing. The perspective view which shows the nasal catheter as 2nd embodiment of this invention. The front view of the nasal catheter shown in FIG. The side view of the nasal catheter shown in FIG. FIG. 9 is a bottom view of the nasal catheter shown in FIG. 8. XII-XII sectional drawing of FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 and 2 show a medical tube 10 of a first embodiment having a structure according to the present invention. The medical tube 10 is a central venous catheter used for central venous nutrition, and has a generally cylindrical shape as a whole, and has a structure in which a reinforcing body 14 is fixed to a peripheral wall of a flexible tubular body 12. Have.

  More specifically, the tubular body 12 has a substantially cylindrical shape with a lumen 15 extending in the length direction, and is formed of a synthetic resin such as polyurethane, polyvinyl chloride, silicone rubber, polyolefin, or fluororesin. And has flexibility. Further, as shown in FIG. 3, the tubular body 12 of the present embodiment has a structure in which an outer layer 18 having a larger diameter is extrapolated to an inner layer 16 having a smaller diameter, and the inner layer 16 and the outer layer 18 are fixedly integrated with each other. It is said that.

  A tubular reinforcing body 14 is fixed between the inner layer 16 and the outer layer 18 of the tubular body 12. The reinforcing body 14 is a mesh formed of a synthetic resin wire such as polyamide, polyester, polyolefin, polyimide, etc. In this embodiment, the reinforcing body 14 is spiral so as to incline in the circumferential direction and continuously extend in the axial direction. It has a structure in which a plurality of wires wound around are integrated with each other at the intersection. Further, the reinforcing body 14 is fixed over the entire length of the tubular body 12 and is exposed from both end faces of the tubular body 12 in the length direction. Further, the reinforcing body 14 made of synthetic resin can be easily cut with a small force by a cutting blade as compared with a stainless steel metal wire having the same cross-sectional shape. Yes.

  As shown in FIG. 3, the reinforcing body 14 is sandwiched and fixed between the inner layer 16 and the outer layer 18 of the tubular body 12. Thereby, the reinforcing body 14 is disposed in an embedded state in the radially intermediate portion of the tubular body 12 and is exposed to the outside at both end faces in the length direction. In FIG. 3, the inner layer 16 and the reinforcing body 14 extend to the outside in the length direction from the outer layer 18, and the inner layer 16 extends to the outside in the length direction from the reinforcing body 14. This is because the reinforcing member 14 is easy to see and illustrated.

  In addition, as for the tubular body 12 and the reinforcement body 14, it is desirable that all are formed with a thermoplastic synthetic resin. However, the tubular body 12 and the reinforcing body 14 may employ the same forming material. For example, a material having excellent flexibility is selected for the tubular body 12, and the reinforcing body 14 has an amount of expansion and contraction deformation. Different materials can be employed depending on the required properties, such as selecting a small material. In the present embodiment, the tubular body 12 is made of polyurethane, and the reinforcing body 14 is made of polyamide.

  The tubular body 12 to which the reinforcing body 14 is fixed is cut to a predetermined length by being cut together with the reinforcing body 14 at a circumferential cutting surface 19 indicated by a one-dot chain line in FIG. As shown in FIG. 4, the end surface of the reinforcing body 14 is exposed at the cut surface 19 of the medical tube 10. The length after cutting is determined according to the application and is not particularly limited. For example, in the case of a central venous catheter (CVC) used for central venous nutrition, it is preferably 10 to 90 cm, more preferably Is about 20 to 60 cm. In the case of a nasal feeding tube used for nasal enteral feeding, it is preferably 30 to 120 cm, more preferably about 50 to 80 cm.

  In addition, although the medical tube 10 used for central parenteral nutrition is illustrated in the figure, the ratio of length and thickness (outer diameter dimension) is different from the actual for the sake of easy understanding. The length is shown small. That is, the length of the medical tube 10 that is a central venous catheter is preferably set in the above range, and the thickness is preferably about 0.3 to 4 mm, more preferably about 1 to 2 mm. It is said. On the other hand, in the nasogastric tube, the thickness is preferably about 1 to 6 mm, more preferably about 2 to 4 mm. However, the length and thickness of the medical tube 10 or the ratio thereof are appropriately set according to the application and required flow rate, and are not particularly limited.

  Furthermore, the cut end 20 of the cut tubular body 12 and the reinforcing body 14 is post-processed. That is, in the present embodiment, the cut ends 20 on both sides of the cut tubular body 12 and the reinforcing body 14 are melted by heating and plastically deformed, and as shown in FIG. The corners are rounded.

  Therefore, in this embodiment, the tubular body 12 and the reinforcing body 14 are both formed of a thermoplastic resin, and the tubular body 12 and the reinforcing body 14 are formed on the cut surface 19 by applying heat treatment to the cut end portion 20. Each is melted and integrated with each other as shown in FIG. In addition, the heating method is not particularly limited, and any of heating by pressing a hot plate, heating by an ultrasonic wave or a semiconductor laser, and the like can be adopted.

  Further, as shown in FIG. 6, the other member can be fixed by post-processing to at least one of the tubular body 12 and the cut end portion 20 of the reinforcing body 14. Other members fixed to the tubular body 12 and the reinforcing body 14 may be a Y-shaped connector, a tip end, or the like in addition to the hub 22 shown in FIG. Thus, post-processing applied to the cut end 20 of the tubular body 12 and the reinforcing body 14 after cutting is not limited to heat treatment, but uses a solvent in addition to adhesion and fitting to other members. The chamfering process of the corner | angular part which was used may be employ | adopted.

  According to the medical tube 10 having such a structure according to the present embodiment, the tubular body 12 is reinforced by the reinforcing body 14, so that sufficient shape stability and elasticity can be obtained even if the tubular body 12 is thin. As a result, the inner diameter can be increased without increasing the outer diameter of the tubular body 12. Therefore, in the small-diameter medical tube 10 that can be easily inserted into the body, a large cross-sectional area of the lumen 15 can be secured, and a flow rate per unit time can be obtained efficiently. Time can be reduced.

  Further, since the tubular body 12 is reinforced by the reinforcing body 14, when the medical tube 10 is inserted into the patient's body, excellent operability (pushability and the like) is exhibited, and insertion into the body is possible. It becomes easy. Moreover, in the medical tube 10, since the reinforcing body 14 has a mesh shape formed of a resin wire, it is possible to obtain excellent flexibility while realizing efficient transmission of force in the length direction. And deformation along the insertion path is allowed. In addition, the resin-made reinforcing body 14 is less susceptible to fatigue failure due to repeated deformation than a metal reinforcing body, and exhibits excellent durability even when left in the body for a long period of time. The

  Further, the tubular body 12 and the reinforcing body 14 are each made of a synthetic resin, and by setting characteristics close to each other, by cooling after cutting, etc., as compared with the case where a metal reinforcing body is adopted. The difference in shrinkage rate is reduced. Therefore, the contraction after the cutting of the tubular body 12 prevents the reinforcing body 14 from protruding from the cut surface of the tubular body 12, and the unevenness of the cut surface 19 is reduced. Is firmly fixed.

  Furthermore, since the synthetic resin reinforcing body 14 is more familiar to the synthetic resin tubular body 12 than the metal reinforcing body, it is easy to obtain the fixing strength, and the strength of the medical tube 10 as a whole. In addition, the rigidity can be improved. Moreover, when the tubular body 12 and the reinforcing body 14 are cut, the reinforcing body 14 and the tubular body 12 are integrally cut without being peeled off, so that the reinforcing body 14 is accurately cut to the same length as the tubular body 12. Thus, the reinforcing body 14 can be prevented from protruding from the cut surface of the tubular body 12.

  Furthermore, since the reinforcing body 14 is made of resin and is easier to cut than that made of metal such as stainless steel, when the tubular body 12 and the reinforcing body 14 are cut integrally, the reinforcing body 14 It is possible to avoid the tubular body 12 from being elastically deformed by being pressed by the blade. As a result, the cutting position of the reinforcing body 14 is prevented from shifting in the length direction due to the deformation of the tubular body 12, and the protrusion of the reinforcing body 14 is suppressed at the cut surface of the tubular body 12. A cut surface 19 can be obtained.

  Moreover, in the medical tube 10 of this embodiment, the tubular body 12 and the reinforcing body 14 are both formed of a thermoplastic resin, and the cut ends 20 of the tubular body 12 and the reinforcing body 14 are plastically deformed by heating. After the corners are rounded. Thus, since the reinforcing body 14 is made of resin, the tubular body 12 and the reinforcing body 14 can be processed simultaneously at the cut end portion 20, and post-processing with plastic deformation can be easily performed.

  Further, as shown in FIG. 6, when the cut ends 20 of the tubular body 12 and the reinforcing body 14 are fixed to other members such as the hub 22, the tubular body 12 and the reinforcing body 14 are each made of synthetic resin. Therefore, the cut end 20 can be firmly and simultaneously fixed to the hub 22 by heat welding. In addition, when the tubular body 12 and the reinforcing body 14 are bonded to the hub 22, the closeness of the material increases the degree of freedom in selecting an adhesive, and the necessary performance can be obtained at a fixing portion where stress is likely to concentrate. It becomes easy to obtain.

  The present invention is not limited to a single-lumen structure medical tube having only one lumen as shown in the first embodiment, but also a double lumen having two to three lumens. It is also applicable to medical tubes with triple lumen structure. That is, the present invention can be suitably applied to a medical tube 30 having a double lumen structure as shown in FIG. In FIG. 7, the vicinity of the cut end 20 of the medical tube 30 that is a main part is shown enlarged.

  Specifically, the medical tube 30 has a structure in which the reinforcing body 14 is fixed to the tubular body 12. More specifically, the tubular body 12 includes a substantially cylindrical peripheral wall 32. Although not clearly shown in the figure, the peripheral wall 32 is formed by the inner layer 16 and the outer layer 18, and the mesh-like reinforcing body 14 is disposed between the inner layer 16 and the outer layer 18.

  The tubular body 12 includes a partition wall 34 that extends in the radial direction of the peripheral wall 32. The partition wall 34 has a substantially flat plate shape extending in the length direction, and divides the central hole of the peripheral wall 32 into two. Thereby, on both sides of the partition wall 34, a first lumen 36 and a second lumen 38 are formed as lumens extending continuously in the longitudinal direction with a semicircular cross section.

  In the present embodiment, the reinforcing body 14 is fixed to the peripheral wall 32, while the reinforcing body 14 is not fixed to the partition wall 34, and the partition wall 34 is made thinner, so that the first and second Large passage cross-sectional areas of the lumens 36 and 38 are secured.

  Further, the tubular body 12 and the reinforcing body 14 fixed to each other have a predetermined length by cutting. Then, the cut end 20 of the cut tubular body 12 and the reinforcing body 14 are post-processed as in the first embodiment. FIG. 7 shows a state where the cut end 20 is melted by heating and the tubular body 12 and the reinforcing body 14 are integrated at the cut end 20.

  Thus, the present invention can be suitably applied to the medical tube 30 having a double lumen structure, and the same effects as those of the first embodiment can be obtained. Furthermore, the cross-sectional area of the central hole of the peripheral wall 32 is reduced by the partition wall 34, and an increase in the outer diameter is suppressed in the medical tube 30 having a double-lumen structure that requires securing the flow rate of the lumens 36 and 38. On the other hand, a large flow rate can be obtained in the first and second lumens 36, 38 while ensuring a large inner diameter. In addition, by reinforcing the peripheral wall 32 with the reinforcing body 14, the ease of operation for inserting the medical tube 30 is ensured, and the peripheral wall 32 is pressed by the pressure of nutrients flowing through the first and second lumens 36 and 38. The diameter expansion deformation is suppressed, and the flow rate is stabilized and the durability is improved.

  Here, the double-lumen medical tube 30 having two lumens is illustrated here, but the present invention is also suitably applied to a medical tube having three or more lumens in parallel. Similar effects can be obtained.

  8 to 12 show a nasal catheter 40 according to a second embodiment of the present invention, with a distal portion as a main part extracted. In addition, in the following description, about the member and site | part substantially the same as 1st embodiment, description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  More specifically, the nasal catheter 40 includes a catheter body 42. The catheter body 42 has a hollow shaft 44 with a lumen 45 extending in the length direction. A connector (not shown) is attached to the proximal end of the shaft 44, and the distal end of the shaft 44 is attached. Is attached with a port member 46. The port member 46 has a substantially cylindrical shape, the distal portion is solid, and a fitting hole 47 extending in the length direction is formed in the proximal portion, so that the shaft 44 is fitted and fixed. Has been. Furthermore, a side hole 48 that opens to the outer peripheral surface of the port member 46 is formed at the distal end of the fitting hole 47, and the lumen 45 of the shaft 44 is connected to the side hole 48. Then, due to the catheter body 42 inserted nasally into the patient's body, nutrients and the like fed from a connector (not shown) which is the proximal end of the catheter body 42 pass through the lumen 45 of the shaft 44 and the side holes of the port member 46. 48 to be administered into the patient's body. Note that the medical tube 10 of the first embodiment can also be used as the shaft 44 of the catheter body 42.

  Further, a medical tube 50 is disposed distal to the catheter body 42. Similar to the medical tube 10 of the first embodiment, the medical tube 50 includes the tubular body 12 and the reinforcing body 14 and has flexibility. Furthermore, the tubular body 12 and the reinforcing body 14 are formed in a substantially cylindrical shape having both sides in the length direction opened, cut to a predetermined length, and then the cut end 20 as in the first embodiment. Has been post-processed.

  That is, the distal end 52 of the cut tubular body 12 and the reinforcing body 14 is closed by being plastically deformed by heat treatment or the like, and is post-processed into a bag shape as shown in FIG. In the present embodiment, the distal end 52 of the tubular body 12 and the reinforcing body 14 is closed by being plastically deformed into a hemispherical shell in consideration of being on the insertion tip side into the body. The distal end 52 of the tubular body 12 and the reinforcing body 14 may be formed in a hemispherical shell shape and closed in advance.

  Further, the proximal end 54 of the tubular body 12 and the reinforcing body 14 is fixed to the distal end of the catheter body 42 by post-processing. That is, the port member 46 constituting the distal end of the catheter body 42 includes a substantially cylindrical fitting protrusion 56 that protrudes toward the distal end, and the fitting protrusion 56 includes the tubular body 12 and the reinforcing body. The proximal end 54 of the tubular body 12 and the reinforcing body 14 is fixed to the distal end of the catheter body 42 by being fitted into the proximal end 54 of the reference numeral 14 and fixed by means such as heat welding or adhesion. . In the present embodiment, the proximal end surfaces of the tubular body 12 and the reinforcing body 14 abut on the stepped surface 57 formed on the outer peripheral side of the proximal end of the fitting projection 56 in the length direction, thereby the tubular body 12. The reinforcing body 14 is positioned with respect to the port member 46 in the length direction. Note that the proximal end 54 of the tubular body 12 and the reinforcing body 14 may be fitted non-adhered to the fitting protrusion 56 as long as sufficient fixing strength can be obtained.

  Then, the distal end 52 and the proximal end 54 of the tubular body 12 and the reinforcing body 14 are respectively post-processed, whereby both side openings of the lumen 15 of the medical tube 10 are closed. The weight 58 is accommodated. The weight 58 is a substantially spherical member made of a metal excellent in biocompatibility, and a plurality (10 in the present embodiment) are arranged in the length direction. Further, the adjacent weights 58 are not bonded, the plurality of weights 58 are allowed to be relatively displaced (sliding), and the weight 58 and the fitting protrusion 56 are also not bonded. Since the relative displacement is allowed, the medical tube 10 is allowed to bend and deform by the relative displacement of the weights 58 even when the weights 58 are accommodated.

  According to the nasal catheter 40 having the structure according to the present embodiment, the medical tube 50 that accommodates and holds the weight 58 has a structure in which the flexible tubular body 12 is fixed to the reinforcing body 14 having high durability. Has been. Therefore, even if the tubular body 12 is broken, the weight 58 is held by the mesh-like reinforcing body 14, so that it can be prevented from coming out of the medical tube 50 into the patient's body. Excellent safety is achieved.

  The distal end 52 of the medical tube 50 is closed by post-processing by a process such as heating after the tubular body 12 and the reinforcing body 14 are cut. As described above, the tubular body 12 and the reinforcing body 14 are each made of synthetic resin, so that the cut end 20 of the tubular body 12 and the reinforcing body 14 can be easily plastically deformed into an arbitrary shape by post-processing. It is also possible to accurately process the distal end 52 on the tip side when inserted into the body into a smooth hemispherical shell shape or the like.

  On the other hand, the proximal end 54 of the medical tube 50 is fixed to the port member 46 that is the distal end of the catheter body 42. In the medical tube 50, the reinforcing body 14 hardly protrudes from the cut surface of the tubular body 12 after the tubular body 12 and the reinforcing body 14 are cut, and the tubular body 12 and the port member 46 are firmly fixed without being obstructed by the reinforcing body 14. Is done. As a result, excellent durability is realized in the fixing portion between the medical tube 50 and the catheter main body 42 where stress tends to concentrate when inserted into the body.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, in the embodiment described above, the tubular body 12 is made transparent in order to make the reinforcing body 14 easy to see, but the tubular body 12 may be made opaque by being colored or the like.

  Furthermore, for example, by providing a contrast marker made of a radiopaque metallic material at both ends and an intermediate portion of the tubular body 12 in the length direction, the medical tube 10 (50 by contrast) at the time of insertion into the body. ) Can also be grasped. Furthermore, a scale in the length direction may be provided on the outer peripheral surface of the tubular body 12 so that the insertion length of the medical tube 10 (50) into the body can be easily grasped.

  When the mesh-like reinforcing body 14 as shown in the above embodiment is employed, the inclination angle of each resin wire relative to the length direction of the medical tube 10 (50) is the required flexibility. It can be set as appropriate according to the sex and pushability. Furthermore, the reinforcing body is not limited to a mesh shape, and a structure in which a resin wire is wound in a coil shape may be employed.

  Further, the post-processing of the cut end portion 20 of the tubular body 12 and the reinforcing body 14 is not limited to the plastic deformation and the adhesion (welding) of other members exemplified in the embodiment, and some processing is performed after cutting. It only has to be given. That is, post-processing of plastically deforming the cut ends 20 of the tubular body 12 and the reinforcing body 14 with a solvent capable of chemically softening or melting the tubular body 12 and the reinforcing body 14 can be employed, and the hub 22 and the like. It may be non-adhesive fitting to other members.

  Further, the present invention is not applied only to the medical tube 10 (50) used in central parenteral nutrition and nasal enteral nutrition, and for example, for medical use used for administration and ventilation of drugs and infusions. It can also be applied to tubes and the like.

10, 30, 50: Medical tube, 12: Tubular body, 14: Reinforcement body, 15: Lumen, 19: Cut surface in the circumferential direction, 20: Cut end, 36: First lumen (lumen), 38 : Second lumen (lumen), 42: catheter body, 52: distal end (cut end), 54: proximal end (cut end), 58: weight

Claims (3)

A mesh-like reinforcement body made of a thermoplastic resin wire is disposed on a flexible thermoplastic resin tubular body, and the tubular body is cut along the circumferential cutting surface together with the reinforcement body. together and a medical tube having a predetermined length by Rukoto, the medical tube, the distal side of Luke catheters body nutrients to be inserted nasally into the patient to administer the drug Is fixed to the
The distal end of the medical tube is closed by being plastically deformed by post-processing by heating the cut end of the tubular body and the reinforcement , and the proximal end of the medical tube is the tubular body by post processing to the body and the reinforcing member of the cut ends is closed by being extrapolated secured to the port member located at the distal end of the catheter body,
A weight is accommodated in the lumen of the medical tube closed at both ends , and a proximal end of the medical tube externally fixed to the port member is formed on the outer peripheral surface of the port member. Is positioned in the length direction by contact with the stepped surface,
A hollow shaft is connected to the proximal end of the port member, and the port member communicates with a lumen of the shaft and is curved to open to an outer peripheral surface at an intermediate portion of the port member. A nasal catheter characterized in that is formed . The nasal catheter according to claim 1, wherein the tubular body includes an inner layer and an outer layer, and the reinforcing body is disposed between the inner layer and the outer layer. The nasal catheter according to claim 1 or 2 , wherein each of the tubular bodies includes a plurality of lumens extending in a length direction.

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