DE2015524A1 - Intravascular catheter device - Google Patents

Description

Patent attorneys
Dr. Ing.Walter Abltz
Dr. Dieter F, Morf
Dr. Hans-A, Brauns

»Munich 86, PieBzenaueratr. 28

April 1, 1970 812 102

DAVID S. SHERIDAN
Hook Road, Argyle, MY 12809, V.St.A-

Intravascular catheter device

The invention relates to intravascular catheters of improved vascular insertability .-- ■

Intravascular catheters are used in a variety of medical applications and clinical treatments for administering fluids of various types into a patient's vasculature or to remove body fluids from the vasculature necessary. The intravascular 'catheter is' thereby brought into the vascular canal that a hole through the. Skin and pushed through the vascular canal wall and the intravascular Catheter is inserted. Devices for performing this task consisting of a trocar and a 'surrounding catheter' were developed already developed. "

With numerous treatments that were carried out on a patient under Ver ~

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wall of intravascular catheters, the Catheter for extended periods of time within the vascular canal stay. The use of the previously available, intravascular Catheter has become a, frequent occurrence of phlebitis so that there is a need for improvements in these medical devices by which through use the phlebitis caused by the devices is alleviated or completely eliminated.

Another difficulty that rriit the use of intravascular Catheter is connected, is the irritation or damage to the vessel wall when inserting the catheter. This can by the action of the tip of the catheter when penetrating through the vessel wall, if they use a probe or a The trocar used to pierce the wall for insertion

The main object of the invention is to provide improvements for intravascular catheters. The invention further aims to improve intravascular catheter devices Forms can be created which reduce the incidence of phlebitis with the use of intravascular catheters.

The aforementioned objects are achieved according to the invention in that the intravascular catheter device by a Trocar and a plastic catheter is formed, which latter surrounds the trocar with a tight fit and tapers at the distal end, which tapered end in turn aar Outer wall of the trocar passes over. The one formed in this way The catheter tip has a smooth, rounded opening that free of sharp edges or the like, which the vascular channel wall can inflame when the catheter is inserted into the vascular canal Catheter devices as low as possible Irritation or injury to the vessel wall when inserting the Kathe

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ters and subsequent withdrawal of the trocar guaranteed. Several trainings are used to provide the necessary To achieve transition of the catheter to the outer wall of the trocar. ■. ■

In a preferred embodiment, the inventive intravascular catheter devices:

a. a tubular trocar for piercing a vessel wall to form an opening through this,

b. which trocar has a sharp-angled point and a self in the longitudinal direction & extending tubular body

. of substantially uniform diameter differs from has the tip extending backwards,

c. a concave gutter adjacent in the tubular body the mentioned tip,

d «a plastic catheter with a substantially uniform Lumen along its length, which is roughly equal to the outside diameter of the tubular body is which catheter is pushed onto the trocar so that it closely surrounds,

e. a distal end portion on the catheter extends to the catheter. tapering tip and.

f. a convex narrowing at the tip of the catheter extends radially inward, the convex shape of the The narrowing is complementary to the concave shape of the groove,

G. which constriction sits in the hat of the catheter device.

In 'another preferred embodiment of the invention

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measured intravascularly catheter device is instead of one convex narrowing at the catheter tip complementary to Trocar groove the catheter tip shrunk into a groove or undercut in the outer wall of the trocar.

Also another embodiment of the invention is in the Trckaraupticnv / and no groove or Ilinterschneidur.g intended. Instead, the V / and is roughened, e.g. by Sandblasting or notching, e.g. by turning or milling in the beginning: direction, and the tapered tip of the Catheter is in the roughened or notched trokaz ^ - wall shrunk.

For a better understanding of the genetic makeup intravascularly Cathotar facilities and the procedure for using them is related to the nach.fo], rende description are indicated with the enclosed drawings and show:

Fig. 1 shows an outline of an intravascular according to the invention Cathoter equipment;

Fig. 2 is a partial view, partially on a larger scale in section, like the diftalon end part of the in Fig. shows catheter device shown;

Fig. 3 in enlarged hatchet a partial view, partially in section, similar to FIG. 2, but showing the trocar of the catheter device from the intravascular Catheter pulled up shows 5

Fig. U a Di-du ^r : -. · Without a v: eitci: en embodiment of a ο.τϊ induη:: - ;; <■ · :: '. Ι: .nen ijitrnvasku 1'Iren catheter equipment:

Fig. Ί) cine!)] ■ <"■ ':.: ·.';; do .: ¹ Trokavoiiihoit the in I" I y ;. Ί aar coi: fc] Hi r i. "T) richt Uli rj

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Fig. 6 is a plan view of the catheter shown in Fig. 4 Set up before cleaning with the trocar shown in Fig. 5;

Fig. 7 in an enlarged hatchet, a partial view of the Side in section of the distal end of the catheter shown in Figure 6;

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FIG. 8 shows, on an enlarged scale, a partial view of FIG Side, partially in section, of the distal end part of the catheter device shown in Fig. 4,

9 shows, on an enlarged scale, a partial view of FIG Page, partly in section, of a further embodiment of the catheter device according to the invention

FIG. 10 shows, on an enlarged scale, a partial view of the Side, partly in section, also of a further embodiment of the catheter devices according to the invention.

As shown in the drawings, the intravascular Catheter device 2, a trocar 4 and a plastic catheter 6.

The trocar 4 has a sharp point 8 that extends from point 10 at an angle to the base 12 of the tip, which latter ground in a suitable manner or at the end of the tubular body IU extending in the longitudinal direction is shaped in a different way. The opposite end of the trocar has an end piece 16 which is used for receiving a cap or a plug can be used to the longitudinal bore 18 of the trocar against a fluid,

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to close the flow. The end piece 16 can be a metal hub be that with a tapered receiving opening 19 is shaped, or a Kunat ^ toffpreßling od, the like, which in suitable way, e.g. 3. by welding, press fit, gluing or the like, is attached to the rigid longitudinally extending tubular body 14 of the trocar. Advantageous The trocar 14 is a conventional injection needle Type made of corrosion-resistant steel with the conventional one Syringe attachment metal hub 16, from / each 'trocar with a Groove 20 is formed,

The concave groove 20 is provided on the tubular body 14 adjacent the tip 3 of the trocar H. The base of the groove 20 is advantageously formed by an arc of a circle, which forms a v / cal manipulation of the plastic catheter part of the catheter device, as will be described below. The groove 20 can, however, also be designed in a different way. The distance of the groove 20 from the end point 10 of the trocar can be modified, but the most satisfactory results when piercing the vessel wall and during insertion are obtained if the distance from the base 12 of the trocar tip to the groove 20 is less than the distance from the Base 12 to trocar tip 10 is. Furthermore, in the case of trocar tips with the preferred angle “a”, ie less than 45, the distance from the base 12 of the angled tip B to the groove 20 is greater than the outer diameter of the tubular body 14.

The plastic catheter 6 v / eist a distal end portion 22 which extends from the catheter tip 24 backwards to a Base 2 5 expanded, at which the outer diameter of the Catheter over the length of the body part 2B essentially remains constant until the proximal end portion 30 of the plastic catheter The proximal end part 50 can be reached by a metal or plastic hub 32 with a tapered Opening and formed by a sleeve 34,

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which two parts in a suitable manner, e.g. by heat of fusion or by gluing, to the body part 28 of the catheter can be connected. If necessary, the proximal end part 30 is a funnel-shaped end connector form, the mxt the plastic catheter body part 2 8 from one piece: is, or the hub 32 can be a plastic ρ be roßling to which the body part is glued or with a butt joint or an overlapped joint.

The degree of tapering of the catheter tip can be regarding the angle of taper or the distance over which the taper extends, can be changed. Most satisfactory results in the use of catheter devices however, are achieved when in conjunction with. the proportions of the dimensions given above the trocar tip is the distance from the tip 24 of the catheter to the base 26 of the tip taper is greater than the diameter of the catheter lumen 34.

The catheter tip 2 H is shaped with a convex constriction 36 which extends radially inward from the catheter tip. The complex shape of this constriction 36 is preferably complementary to the concave shape of the groove 20 so that a suitable interlocking of the constriction 36 and the hat 20 is obtained when the catheter device in preparation for intravascular insertion into a patient in the FIGS 2. This engagement relationship between the trocar U and the catheter 6 enables a smooth intravascular penetration of the catheter after the vascular wall has been pierced by the trocar and catheter device. Such a design therefore serves to prevent phlebitis, buscutaneous IJ. " to reduce matomas or similar adverse events that may cause discomfort or other adverse reactions in the patient ¹ .

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Although the trocar 4 is advantageously made entirely of metal, or at least the tubular body and the tip are formed from metal, the trocar or the probe can be made from a suitable rigid plastic material
Furthermore, although the plastic catheter 6 and in particular the proximal end part 2 2 and the main body part 28 are formed from plasticized polyvinyl chloride, other flexible or semi-rigid plastics can also be used for the
specified purpose. The proximal end part
of the catheter 6, which forms the connecting piece for connecting the catheter to a liquid delivery line,
if a sdche is required when using the device, it can be made from one piece as an extended funnel end from the
be molded the same plastic that is used for the tubular body portion 28, or from a different plastic material such as metal. The formation of the catheter tip portion with the tapered portion 22 and 14
the convex narrowing 36 can be achieved in various ways. For example, the catheter 6 can be molded entirely from a suitable plastic by injection molding. If necessary, the main body part 28 can be cut from an extruded tube, the taper 22 can be ground or cut onto the end of the tube.
and the rounded tip are 2 ^l \ and the convex narrowing 3G may be prepared by molding under pressure and W.'lrme- application by controlled Flariinpolieren or by another
known per se suitable plastic processing method has been obtained.

Instead of a]: «ν) 1 <··: ..-- ρΐ" re V.'uünt 36 an K.-thnier z \; jV ^ -on,? · .- "inside also other · -; Au- ^ h :! !. Fertilizers are provided, u ^r n the necessary i '^ berr: αι .. * der l'nthet ^ rnpitze zur Aunsonwami der: Troknrs;: u cn.j? l (. ^: . ^: .ine' Mcscr training is in Fig. 4 - E i] ii) '!' (. ::.; l'c1] i, 't ■■' c: -cr.><.!'?; guiding form i; »t si all . a HA31)] - roi: ^-: '!..: · / <> ■} ir Ί0 which o.inc ei c3si \'. ^r "ir · ::: · ■■ ■ · ri: i, , c Ii -.-

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may be a jection needle or a fixed probe, an undercut 42 in the outer wall 44 adjacent to the angled Point 46 ground or milled. The catheter 48 is in turn through a plastic cannula 40 with a Inner diameter or lumen 52 formed, the v. Of such The big thing is that a tight sliding fit or sliding fit the wall 44 of the trocar 40 is obtained. A hub 54 from Compression molded plastic with a tapered proximal Luerian opening 56 is on the cannula 50 through an adhesive dissolver or by heat sealing, cementing or mechanical securing attached in the front collar 58 of the hub.

The distal end 60 of the cannula 50 is rounded on or tapered tip 62 compression molded or ground, before the catheter 48 is placed on the trocar 40. Immediately prior to this assembly, the distal end portion 60 of the cannula 50 into a volatile organic liquid soaked which is the plastic from which the cannula is molded is, expands and leaches the softener, for example the cannula can be molded from polyvinyl chloride that has been calibrated with dioctyl phthalate, and ethyl acetate can be used as the liquor. While If the cannula tip is still in the expanded state, it is moved over the trocar into the position shown in FIGS. 4 and 8 pushed. The plastic shrinks as the organic liquid evaporates. The shape of the cannula tip 62 and the trocar undercut 42 obtained in this way after the shrinking of the plastic is. shown in fig. That part of the Plastic that has been treated with the organic solvent requires a greater durometer hardness than the plasticizer is leached out. This increased stiffness helps make the cannula tip better undercut 42 to keep. This in turn helps prevent the cannula from "pushing back" when the device is through the vascular wall of a patient is inserted. Furthermore, the geometry obtained from the shrunk-on cannula enables

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at the tip and the end of the trocar, the catheter can be inserted without causing a venous thrombosis.

Another possibility for producing a transition from the distal end tip of the catheter to the trocar wall is in FIG Fig. 9 shown. In this embodiment, the outer wall 64 of the trocar G6 is roughened on the distal end part 68, for example by sandblasting, centerless grinding, chemical etching, electrolytic etching or the like .. The distal End portion 70 with the tapered tip 72 of the cannula 74 is expanded by a volatile organic liquid and then placed on the trocar so that the expanded portion 70 rests on the roughened trocar surface 68. if As the dilatation fluid evaporates, the cannula end portion 70 and tip 72 shrink around the trocar, creating a solid Transition from the cannula tip to the trocar is obtained. As a result, a good holder is achieved and a. "Pushing back" the flexible cannula on the trocar prevents the skin and the vessel wall of the patient from being damaged Insertion of the catheter device are pierced.

Yet another embodiment is shown in FIG. The wall 76 of the trocar 78 with a number of flat circumferential grooves 80 by milling, cutting, pressing or the like. notched. The distal end portion 8 2 of the cannula and the tapered one Tips 84 are expanded with a volatile organic liquid prior to assembly of the parts. When evaporating the fluid becomes a transition from the distal end to the trocar wall at the same time as an increased rigidity of the cannula received in the end part. In any of the described embodiments, the distal tip or other end portions of the Catheters can be made opaque to X-rays in order to determine the position or location of the catheter or parts the same, if they break in use, in the patient's body by an X-ray examination, for example by means of a photographic plate or a fluoroscope,

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established that x ^ can ground;

According to the current practice in trading Intravascular catheters common are those described and- presented new catheter devices, Zugswei.se into one. Function container or in a function pack brought and sterilized in a suitable manner, e.g. by having Äthylenoxyddärapfen, gamma rays or the like. get abandoned. In such a packaging unit, the catheter device preferably has a (not shown) small plastic plug that is inserted into the opening at the proximal end of the trocar connector to maintain sterility within the T.rocar bore and to seal the latter against the escape of blood or other vascular fluids up to the exact point in time, on which the doctor, the nurse or any other person who is using the catheter device at a Patient used who wants to open the trocar hole.

The use of the catheter devices according to the invention, as described above, follows the general practice which has been developed for the use of already known similar devices. In the embodiment according to FIG. 1, the pointed end 8 of the trocar is used to pierce the vessel wall of a patient in order to create an opening through it. When the catheter device penetrates the vessel wall, the plastic catheter 6 enters the vascular canal together with the trocar! a. Now, if special treatment measures so require, the vascular fluid can be withdrawn through the trocar bore 18 from the connection end 16 or fluids can be introduced through the same channel. Normal use of the catheter device, however, requires the trocar U to be withdrawn from the catheter device; this happens because ^p ) the plastic catheter 6 with respect to the patient

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is held immobile that the catheter connection end 3 2 is detected and the trocar is pulled out through the catheter 6 in that the trocar connection end 16 is pulled will. Now an infusion tube (not shown) or another suitable device to the catheter at the connection end 32 connected to the ground and any necessary infusion flow into the vascular channel into which the Catheter 6 has been inserted, begin. Adhesive tape or similar arrangements known per se can be provided be to ensure the retention of the catheter 6 in the patient so that a possible unintentional displacement is avoided during normal patient movement.

! light is only provided by the new structural arrangement for the transition between the trocar and the specially designed end of the catheter, as described above Smooth intravascular penetration of the catheter is achieved, but it is also achieved through the rounded tip and through dio hardening on the iliido of the catheter a decrease in the Friction of the inner vascular canal is achieved. To this VJci:; <. ' ] ä / Vt sich <i jr- occurrence of phlebitis in patients, where ini rav.isscular catheters have been inserted, reduce it a little.

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Claims (10)

102 April 1, 1970 Pat β η ta η s ρ ν ü ch e Iy Intravascular Catheter Device, labeled by ■ ₍ ·. a. a trocar for piercing a vessel wall to create an opening b. which trocar has a sharp-angled tip and a longitudinally extending tubular body of substantially uniform diameter which extends rearwardly from the tip,. '■': c. a grooved or roughened outer wall surface of the tubular body adjacent the mentioned tip, "" * ■ d. a plastic catheter with an essentially uniform lumen over its length, which is approximately equal to the outside diameter of the tubular body is, the "catheter is pushed onto the trocar so that it surrounds it tightly, e. the distal end portion of the catheter tapers to the catheter tip, which is softly rounded, and f. the mentioned distal end part on the grooved or roughened outer wall surface of the trocar applied 2. Catheter device according to claim 1, characterized in that that the trocar is a metal tube with a Luerian hat at the end opposite the angled tip is is. 00984A / 1 19 1 102 3. Catheter device according to claim 1, characterized in that the catheter is made of plasticized polyvinyl chloride is made. Catheter device according to claim 1, characterized in that that the trocar has a concave groove in the outer wall adjacent to the angled tip, and the catheter is designed with a convex constriction which extends radially inward from the catheter tip extends and sits in the groove mentioned. 5, catheter device according to claim 4, characterized in that that the distance from the base of the angled tip to the end point of the tip is greater than the distance from the base to the concave groove. 6. Catheter device according to claim 5, characterized in that that the distance from the tip of the catheter to the base of the taper of the tip is greater than that Catheter lumen is. 7. catheter device according to claim 1, characterized in that that the proximal end part of the catheter has a connection for connecting the same with a liquid conveyor hose or the like. 8. Catheter device according to claim 1, characterized in that the outer wall surface of the trocar is adjacent 00 984 A / 1191 BATH ORIGINAL 812; '102 bears the angled tip by sandblasting- '" g'eVäuht "and the distal end part is shrunk onto the roughened surface and a larger one Durometer hardness · than the middle part of the body of the Catheter. · 9. Käthetiereinrichtung according to claim 1, characterized in that the said "outer surface of the Trökar adjacent to the angled. Point is notched by flat 'circumferential grooves and the distal end part is roughened on the roughened surface and a greater durometer hardness than the middle body part of the catheter . "'. · -. ■■ -. "': \ 10. Catheter device according to claim 1, characterized in that that the outer surface of the trocar adjacent to the angled tip is formed with a groove and the distal end tip of the catheter is both tapered as well as in the mentioned groove by means of a solvent is shrunk, wherein the mentioned tip is more rigid than the catheter part to the mentioned Groove shrink tip is proximal. - 00 9844/1 19 1 ■ - 15 -. BATH ORIGINAL Blank page