DE2116108A1 - Intravenous catheter - Google Patents

Description

211610a

Dr. A. Msntzel _{λ m A n}

ipl.-ing. V /. Dahlke _There . -w / ho

Peienian lawyers
Reiräih near Cologne

Celestial 137

ILLINOIS TOOL WOBKS, Inc. Chicago, Illinois (VS ¹ .A.)

* Intravenous skathe ter "

The invention "relates to a one-piece plastic catheter for use in intravenous infusions.

There are several common procedures for initiating or for Drawing off fluid into the human body. One method makes use of a channeled or hollow needle, in which a flexible catheter is arranged telescopically.

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After the venipuncture, the catheter is inserted into the vein. The canalized needle or hollow needle either remains in the body or is pulled out. The channeled needle is preferably removed from the vein. To injure the patient To avoid this, the needle is preferably also removed from the catheter, as is the case with the subject of the U.S. Patent 5,559,978 to Pail.

Another known method makes use of a hollow catheter which sits telescopically over a needle or burin, the needle or burin serving to perform the venipuncture. Then the needle is removed from the vein. The catheter remains in the set position within the artery. The invention relates to this latter method, which is referred to below as the "outer catheter ¹¹ method, in order to enable a distinction to be made with respect to the internal storage of the catheter opposite the needle, which is referred to in the following with the term" inner catheter "method.

The external catheter procedure is widely used because it has the twofold advantage of being completely removed, allow the needle or burin while causing little pain or discomfort, since the elongated, relatively flexible part of the known catheter remains in the patient. Until the development of the

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With a hollow needle with a hollow guide, as is known from US Pat. No. 3,359,978, there was always the possibility that the cannulated or hollow needle would injure the patient or puncture the catheter because it was not removed or removed from the catheter said method catheter use is made of the advantage of the reliable and acceptable reduction of the catheter in the interior a could be separated. This difficulty is largely dissolved in the range removable Führungenadein due to the teaching of. Patent and said other developments.

Even if the external catheter procedure is the previously known Having eliminated the difficulties of the inner catheter procedure, it still has some disadvantages. As a result of the fact that the outer catheter generally consists of an enlarged, tapered sleeve that is flexible with one piece Hose is connected, there is always the disadvantage of a relatively large distance to the handle of the device that the The needle or the burin is normally assigned and therefore lies on the side of the socket that is from the puncture site away. This makes it more difficult to locate the vein and to correctly position the needle or burin for piercing. The socket is generally frustoconical Shape as a result of the need to make connections with a line that a dropper bottle or the like. assigned is, whereby a connection is made with push-in fittings.

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The well-known design of the socket of a catheter makes it not only difficult that. Catheter through the socket. sticking to the skin, but, which also makes the catheter uncomfortable, because the socket looks into the skin. As most Outer catheters also have a two-part construction, in which a hose section with a substantially frustoconical Is connected to the socket element, there is always the risk of the hose being separated from the socket at the connection point. The disadvantages have prevented the external catheter procedure from becoming more widespread.

The invention is based on the object of a catheter for To create use in the external catheter method, which eliminates the disadvantages mentioned, while having all the known advantages maintains.

In particular, the invention aims to provide a one-piece Plastic catheter for the external catheter method, which involves inserting and removing the catheter as opposed to a Body part relieved.

The invention also aims to provide a one-piece plastic catheter for the outer catheter method, which in comparison to known catheters eliminates much of the patient's pain or discomfort that normally would in connection with known catheters, during insertion and

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Holding the catheter within) a body part occurs.

The invention also aims to provide a one-piece plastic catheter for the external catheter method in which the construction-related hazard is largely eliminated, which occurs with known catheters of this type.

For this purpose, a one-piece plastic catheter is provided according to the invention, which has a number of one-piece hollow tube sections | successively increasing diameter from the front to the rear end, wherein the front hollow tube section is provided with a diameter which is only slightly larger than a needle which is provided for arrangement within the tube sections. The front hollow Tubusabachnitt is flexibly arranged on an adjacent, relatively rigid hollow Tubuaabeohnitt to allow a freedom in the movement of the front hollow Tubusabachn.ittea after insertion of the front hollow Tubusabschnittes in a body part and after the removal of a needle from the catheter . The relatively rigid tube section is provided with integrally formed, substantially opposite and laterally outwardly directed tabs which can be manipulated from a buoy position into a position in which the tabs can be grasped at the same time in order to insert the catheter into a body part facilitate. The rear hollow tube section is also provided with a one-piece fitting element

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see with the one. complementary fitting of another part can be connected. The catheter can also have an eccentric arrangement of the one-piece hollow tube sections with respect to one another Provide for a dimension that is sufficient for a number of essentially cotangential flat surfaces on the underside of the catheter, wherein the eccentrically arranged hollow tube sections are arranged so that they one Form a concentric passage into which the needle is inserted can be in order to offer the possibility that the catheter aioh fits closely to the outer shape of the body part, when the front hollow tube section is inserted into the body part is.

The invention is explained in more detail below on the basis of exemplary embodiments with reference to the drawings. In the drawings are j

1 is a diagram of a catheter setting arrangement to which a one-piece plastic catheter according to the invention, a hypodermic needle for use in connection with the Catheter is set up for making the puncture, and includes a hose connector that connects to the catheter is provided and has a piercing element at one end for piercing the membrane is provided that a dropper bottle or the like.

is assigned - 7 -

109843/1257

Pig. Fig. 2 is a side view, on an enlarged scale, showing the use of the catheter and the associated injection needle during the making of the puncture is shown,

Fig. 3 is a plan view in which the catheter in its Arrangement is provided on a body part, the Katheiter connected to a hose is, in turn with a dropper bottle or the like. connected is,

Pig. Figure 4 is an end view of the catheter in the direction of view from the greater part of it,

Pig. 5 is a side view on an enlarged scale; in which the shape and the connection of the different successively increasing sections of the catheter are shown,

Pig. 6 is an enlarged section corresponding to the illustration in Pig. 5, in which the porm of different sections of the catheter are shown in detail,

Pig. 7 shows a plan view of a further exemplary embodiment of the catheter;

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8 is an enlarged plan view of a catheter in another. Embodiment of the invention similar to the illustration in. Fig. 7,

FIG. 9 is an end view of that shown in FIG. Catheter facing the larger Section of the same and

10 is a plan view approximately in natural size of a. Catheter in. Another. Embodiment the invention.

Within the scope of the invention, the one-piece part, which is hereinafter generally referred to as the catheter, as a. Part of an infusion set can be used in the sense that the introducer may have a needle tip, so that it is not necessary to insert a needle or a. Use a burin to make the puncture, although the catheter is preferably used in conjunction with a catheter apparatus that has a. Has construction according to the external catheter method.

In the one shown in Figs. Embodiment of the invention the catheter 10 is preferably a needle or a Graver 12 assigned, if, the puncture in a part of the body he follows. Before and during the puncture, the

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Catheter 10 and needle 12 are tethered as shown in FIG. Daa is made so that the sharp needle tip 14 _f, which is associated with the relatively rigid needle shaft, can perform the puncture. Furthermore, the needle 12 is assigned a frustoconical or wedge-shaped fitting 16 which fits into a correspondingly shaped fitting of the catheter 12, which will be described later. After making the puncture through the catheter 10 and the needle 12 in the arrangement shown in Fig. 2, the needle 12 can then from the. | Catheter are withdrawn so that only the catheter 10 remains in the body part. In order to enable a withdrawal or an introduction of liquid, the catheter 10 must then be connected to a hose, which the catheter 10 with a dropper bottle or the like. connects. One way in which this connection can be established is, for example, by means of the hose coupling 18 which is shown in FIG. 1. The tube coupling 18 comprises a substantially frustoconical fitting 20 which can be connected at one end to a correspondingly shaped fitting of the catheter which will be described later. The hose coupling 18 can furthermore comprise a piercing part 22 at the other end, which can pierce the membrane that defines the opening or the neck of a dropper bottle or the like. locks. Alternatively, of course, other means can also be provided to the hose coupling 18 oddgl. for example to connect with a dropper bottle.

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The catheter 10 is a. One-piece art st of ft part which has a number of one-piece hollow tube sections 24, 26 and 28 of successively increasing diameter from the front to the rear end. The front hollow tube section 24 can be provided with a tapering or frustoconical insertion end 30, which facilitates the insertion of the catheter 10 in connection with the needle 12 when the puncture is made. The connecting sections between the front, middle and rear hollow tube sections 24, 26 and 28 are also each preferably conical or provided in a frustoconical shape which increases in size from the front to the rear end of the catheter 10. D _e r conical portion between the front and the middle hollow tubular portion 26 and 24 is shown at 32, while the connection between the middle and the rear hollow. Tube section 26 and 28 is shown at 34. The conical sections 32 and 34 not only form the connections between the successively larger hollow tube sections, but they also facilitate shaping and enable a one-piece construction which is advantageous for the use of the catheter, which will be seen later.

The front hollow tube portion 24 is of an inner diameter provided, which is only slightly larger than the shaft of the needle 12, so that only relatively little body fluid during the Making a puncture can escape. So that the hollow

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front tube section 24 freedom of movement within If there are body parts after the needle 12 has been withdrawn from the catheter 10, the anterior hollow tube section 24 is arranged flexibly on the adjoining, relatively rigid, hollow tube section 26 and / or on the conical section 32. In the eaem Attention should also be paid to the fact that the anterior hollow tube section 24 comparatively long stretched iat and one thinner wall thickness (FIG. 6) than the adjoining, relatively atarre hollow central tubua section and the conical section 52 its upper part has. The lower parts of the hollow tube sections length of the cotangential flat surfaces on the underside dea catheters have a relatively uniform wall thickness, which will be described later. The thicker parts the koniachen portion 52 and the central hollow Tube section 26 on the upper parts in connection with the elongated shape of the front hollow tube section and its uniformly thinner wall dimensions allow a flexible arrangement of the front hollow tube section a 24 in relation to the adjacent parts of the cathetera. That has the ^ important advantage that the front hollow section 24 then, if he is sitting in the part of the body, have sufficient movement has to adapt to different positions of the body part and adjust to it. This greatly eliminates pain or discomfort associated with inflexible catheters goes hand in hand. In order to achieve greater flexibility, it is provided that the plastic from which the catheter 10 is made

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is provided in a version that has a low Amount of moisture absorbed to become more pliable and comfortable after the catheter is placed in the body part is.

As already mentioned, one of the known disadvantages of external catheter arrangements is that it is not possible to to perform proper venipuncture. According to the invention this disadvantage can be eliminated by having two integrally formed, essentially opposite, and laterally outwardly extending tabs 36 and 38 worked which are connected to the catheter 10 in a flexible and articulated manner. In particular, they are essentially flat and rectangular shaped tabs 36 and 38 integral with the relatively rigid central hollow tube section 26 connected, like that in Pig. 1 and 5 is shown. While corresponding tabs are known in a number of. Arrangements already used are, as they are known for example from US Pat. No. 3,064,648, these flexible tabs sit in the known arrangements in general. inflexible, separate. Metal needle shafts. The ones known at the tabs in these Arrangements achieved flexibility is therefore not used in the needle or in the elongated tube section, that remains in the body part. According to the invention, the flexible tabs 36 and 38 are indeed on a relatively rigid, hollow tube section 26 arranged or, in one piece, allied with it, aie

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but are also in one piece with the relatively flexible hollow front Tube section 24 assigned and arranged for use in connection therewith.

While the punctures are being made, the tabs 56 and 58 are in a known manner according to the position in FIG. 2 used. The tabs 56 and 58 are grasped and inserted into a Positioned side by side to serve as a handle while this surgical procedure is being performed. After the puncture has been taken, the tabs 56 and 58 can then, with a sticking tape to the skin of the body part as shown in FIG.

The tabs 56 and 58 are also positioned opposite the catheter 10 so that they sit on the relatively rigid hollow central tube section 26, which has a diameter which is slightly larger than the front hollow tube section 24, so that the tabs 56 and 58 during the puncture and can be easily handled during the comparison M gluing of the tabs with the skin of a body part and bent. The tabs 56 and are also only slightly offset from a central point of the catheter, and this makes it easier to insert the catheter. the intended place.

The rear hollow tube section 28 is a relatively rigid one and much larger part. The hollow rear tube end

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-H-

Cut 28 has a double function, namely as it cooperates with the front and middle hollow barrel sections 24 and 26 to form a concentric passageway form into which the needle 12 can be inserted while at the same time forming a complementary pitting to the pitting 16 of the needle 12 and / or the. Pitting 20 of the hose coupling to be taken. The rear hollow tube section 28 thus forms the means by which the catheter 10 is provided with a dropper bottle or the like. can be connected. Preferably they are complementary trained. Fittings of the rear, hollow tube section 28, the fitting 16 of the needle 12 and the fitting 20 of the hose coupling 18 are provided in a plug-in cone shape, which in the area medicine in general.

Another important feature of the invention is provided that the hollow tube and cone sections connecting them are arranged eccentrically relative to one another, as in FIG. 2 and 4-6 to define a surface 40 substantially cotangent to the various. Sections of the catheter. The tabs. 36 and 38 are also with the relatively rigid, hollow central tube section 26 in this way connected that the undersides 42, 44 of the same, also in a plane with the surface 40 lie. The advantage of this structure is that the bottom of the catheter 10 is close at. the outer shape of the body part can be created., in contrast to known arrangements that tend to indent into the skin causing pain and / or discomfort.

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The eccentric arrangement of the various sections of the Catheter (IMg. 4 and 6) interferes with the provision of a concentric Not a passage into which the needle 12 can be inserted. Pie eccentric displacement of the various sections of the catheter is therefore only provided to such an extent that it is sufficient to cover the essentially cotangential surface 40 on the underside of the catheter without disturbing the concentric passageway required for the needle 12 will. Although the needle 12 can also be offset with respect to its pitting 16, (Fig. 1) it has been determined { that the usual needle syringes 12, in which the needle shaft and the fitting 16 are arranged concentrically relative to one another can be used while making the puncture with the catheter 10.

In Fig. 7, a further embodiment of the invention is shown. In this embodiment, they become the same Reference numerals are used to identify parts that correspond to the parts in the embodiment shown in FIGS. 1 to 6 j correspond, whereby the letter "a" is added to distinguish it is. The catheter 10a in the exemplary embodiment shown in FIG. 7 corresponds in all important features to that in FIG Fig. 1 to 6 shown embodiment, apart from the tabs 46 and 48. In this embodiment, the Tabs 46 and 48 are connected to the hollow central tube section 26a, but extend over the conical ab-

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cut out 34a and go partially hollow to the rear Tube section 28a. This is achieved by the length of the tabs 46 and 48 is enlarged, while a gap between the tabs 46 and 48 and the Konusabschnitt.itt 34 and the rear hollow tube section 28a is provided (at 50 or 52). This arrangement of the parts allows greater flexibility with larger tabs 46 and 48 than they are in the first Execution example are provided.

In the embodiment shown in FIGS. 8 and 9, corresponding reference numbers are used to identify parts, which correspond to those in the embodiment shown in. Fig. 1 to 6, the letter to distinguish * b * is added. In. this embodiment consists of relatively rigid hollow tube section on which the front hollow Tube section 24b is arranged flexibly, from a substantially conical section 54. The tabs 36b and 38b are also substantially conical with the. Section 54b connected as shown. The substantially conical portion 54b includes a relatively large opening at the rear End intended to form a complementary fitting into which the fitting of another part is inserted can be. The essentially conical section 54 thus serves to fulfill several functions at the same time, the embodiment shown by various parts of the in Figs be rendered while at the same time all

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- 17 important functions of the invention are fulfilled.

There now follows a description of the embodiment shown in FIG. 10, in which the same reference numerals are used to identify parts that correspond to parts in the in PIg. 1 to 6 correspond to the embodiment shown, wherein to distinguish the letter "c * is added. The in Fig. The embodiment shown in FIG. 10 has certain features of the embodiment shown in FIG. 7, and consequently " Corresponding reference numerals are used here as were used in the embodiment shown in FIG.

The catheter 10c shown in Fig. 10 includes tabs 46 and 48 in the embodiment shown in Fig. 7, inasmuch as the tabs 46 and 48 are connected to the hollow central tube section 26c but extend beyond the rear hollow tube section 28c. in the intermediate spaces 50 and between the tabs 46 and 48 and the conical section d 34c and the rear hollow tube section 28c are provided, as has already been described. The tabs 46 and 48 are provided with reinforcing ribs or grooves 56, 58 which increase the grip of the catheter. While the tabs 46 and 48 in the embodiment shown in FIG. 7 are preferably used in the embodiment shown in FIG. 10, the tabs can also be provided in the form as shown in the embodiment shown in FIGS.

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- 18 is seen «

The difference between the one in Pig. 10 shown embodiment and the design examples already mentioned are in the form of the central hollow tube section 26c. This difference is most evident from Pig. 5 and 6 to be recognized in which the hollow tubua section 26c is shown in phantom is. The hollow tube section 26c runs downward hollow tube section 28 opposite to (which has the same shape like section 28c in Pig. 10), at a much steeper angle, and it goes into the front hollow Tuhuaabaehnitt 24 essentially at the same point over, at which the conical section 32 dea in Pig. 1 to 6 shown Ausführungsbeiapiela merges into the hollow tube section 24. While in the one in Pig. 10 shown embodiment a gradually tapering pore between the anterior hollow tube section 24 and the rear hollow tube section 28 is provided in the Porm de3 middle hollow tube section a 26c, the catheter has portions defining the separate sections 24c, 26c and 28c. Particular attention is paid to the conical section 32c between the front hollow tube section and the middle tube section 26c and the conical section 34-c between the middle and the posterior hollow tubual part 26c and 28c, respectively. When comparing the one in Pig. 10 and that shown in Pig. 5 and 6 shown Porm out, conical sections 32c and 34-c, in

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Direction of view from the rear. The end of the catheter 10c to the front, the diameter between the various hollow tube sections in the radial direction when looking at the plan view shown in FIG. 10. This is due to the fact that the central hollow tube section 26c is substantially triangular in shape and has an upper tapered surface 62, two opposing, spaced apart side surfaces 64 and 66 which extend substantially perpendicular thereto, and a lower surface ( not shown), which coincides with the λ cotangential surface 40. As a result, the tapered sections 32c and 34c, respectively, reduce the diameter between the hollow tube section by constricting the opposing, spaced apart side surfaces. 64 and 66 in the area of the tapering surfaces 32c and 34c.

The embodiment shown in Fig. 10 is particularly good can be used in connection with a needle 12 in one version, in which the needle section is concentric with respect to the fitting 16 is arranged, in contrast to the eccentrically arranged '"needle shown in Fig. 1. The catheter in the one shown in Fig. The embodiment shown in FIG. 10 thus has a shape that enables the use of needle types that are currently being used will.

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Claims (13)

- 20 claims 1.] Plastic catheter in one piece, marked by a number of integral hollow tube sections (24, 26, 28) successively increasing diameter from the front to the rear end, of which the front hollow tube section (24) has a diameter which is only slightly larger than that of a needle (12), which is used for the arrangement is provided within the tube sections (24, 26, 28), and flexible to an adjacent, relatively stare hollow. Tube section (26) is arranged such that freedom of movement of the front hollow tube section (24) after it has been introduced into a part of the body and after the needle (12) has been removed from the Catheter (10) is made possible, and of which the relatively rigid tube section (26) is formed in one piece, essentially opposite and laterally outwardly directed tabs (36, 38), which from a booth position can be handled in a position in which a simultaneous gripping of the tabs (36, 38) to facilitate insertion of the catheter (10) is made possible in a body part, wherein of the tube sections, the rear hollow tube section (28) of the catheter (10) comprises a one-piece fitting with which a complementary fitting of another Partly is connectable. - 21 109843/1257 2. Catheter according to claim 1 _r, characterized in that the number of single-piece hollow Tubusabach sections (24, 26, 28) are formed by a front (24), a middle (26) and a rear hollow Tubusabachnitt (28). 3. Catheter according to claim 2, characterized in that that the middle tubua section (26) forms the relatively rigid hollow tubua section. 4. Catheter according to claim 2, characterized in that that the anterior (24), the middle (26) and the posterior tubua section (28) by tapering abach sections (32, 34) are connected to one another and enlarge from the front to the rear end. 5. Catheter according to claim 4, characterized in that that daa introductory (30) dea front f | hollow tubuaabachnittea (24) comprises a tapered wall, the aich from the front end to the rear end of the cathetera enlarged. 6. Catheter according to claim 1, characterized in that that the adjoining, relatively rigid, hollow tubual section (26 $ the rear hollow tubual section dea Catheter forms. - 22 - 109843/1757 7. Catheter according to claim 6, characterized in that that the rear hollow tube section (28c) comprises a conical outer wall portion which extends from the front enlarged towards the rear of the catheter. 8 * catheter according to claim t, characterized in that that the one-piece hollow tube sections (24, 26> 28) are offset eccentrically relative to one another by an amount which is so sufficient that one essentially cotangential surface (40) on the underside of the catheter (10) arises, the eccentrically arranged hollow Tube sections (24, 26, 28) are further arranged to form a concentric passage into which the needle (12) can be used in such a way that the catheter (10) after the front hollow tube section (24) has been inserted into a Body part can be placed close to the outer shape of the body part is. 9. Catheter according to claim 2, characterized in that that the longitudinal dimension of each side according to outwardly directed tab (36, 38) is essentially equal to the longitudinal dimension of the central hollow tube section (26). 10. Catheter according to claim 4 »marked egg without t, that the longitudinal dimension of the laterally outwardly directed tab (%, 48) is greater than the longitudinal dimension - 23 - ^, x ~ m jmmm ^ 09843/1257 of the central hollow tube section (26a), the respective tab (46, 48) extending over the conical section (34a) extends out between the middle (26a) and the rear hollow tube section (28a), but not with it connected is. 11. Catheter according to claim 1, characterized in that that the one-piece pitting, which is assigned to the rear hollow tube section (28), the nut | is part of a plug-in coupling into which the male part of the plug-in coupling can be inserted. 12. Catheter according to claim 8, characterized in that the middle tube section (26e) has a triangular part which has a tapering upper surface (62), two opposite, spaced- apart. Has side surfaces (64, 66) extending substantially perpendicular thereto and a lower surface which coincides with the substantially cotangential surface (40) on the underside of the catheter. 13. A catheter according to claim 1, characterized i marked by the fact that the laterally outward '■■ tabs (36, 38) connected to the relatively rigid tube portion (26) in the area of kotangentialen surface (40). - 24 - T09843 / 1? 57 ORlQfNAL INSPECTED 14- · catheter according to claim 12, characterized in that that the underside of each side facing outwards. Tab (36, 38) in. One level with the cotangential surface (40) of the relatively rigid hollow, lubuaabachnittea (26) lies. 109843/17 Empty soap