Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M25/00—Catheters; Hollow probes
  • A61M25/0067—Catheters; Hollow probes characterised by the distal end, e.g. tips
  • A61M25/0074—Dynamic characteristics of the catheter tip, e.g. openable, closable, expandable or deformable
  • A61M25/0075—Valve means

Definitions

• the invention relates to a catheter for
• hypodermic syringes as they are also used to inject the medication through catheters of the type in question
• the principle generally applies aspirate each injection with the syringe.
• This aspiration process before making injections with hypodermic syringes is a routine, inveterate procedure (so-called aspiration sample) for treating physicians, and if such an aspiration sample is not permitted before an injection, special attention must be drawn to this, or precautions must be taken. to reliably avoid sucking back blood.
• One-way valves of the catheters of the type in question should suffice for this purpose.
• a catheter of the type initially assumed to be known has become known from EP-AI 351 864.
• This known catheter is made of thermoplastic materials such as polyurethane or soft PVC, since such materials make it easy to manufacture the intended disposable
• the tube of the catheter is rounded off at its front end, the wall thickness of the rounded end essentially corresponding to the wall thickness of the tube itself t 5.
• the one-way valve is formed by a 'slot which is slightly smaller in length than that
• valve slots are designed as two-way valves.
• the slot length should be such that the valve slots can open either outwards or inwards, depending on the pressure that occurs.
• a special treatment of the catheter tube in the valve area is proposed. Silicone rubber is to be used as the material for this valve catheter. Due to the intended two-way effect of the valve slots, such catheters cannot be used where it is important to avoid sucking back blood in any case.
• Such catheters are therefore suitable for treating veins, but not for treating arteries.
• the present invention is based on the object of taking precautions for a catheter of the type initially known as known, on the one hand to ensure adequate fluid passage through the valve on
• the catheter designed according to the invention reliably avoids the entry of blood into the catheter, even if one unintentional suction with an injection syringe.
• the catheter ensures that such blood ingress also
• Mandrins ie a guide wire for inserting the catheter
• the embodiment according to the invention ensures that the safe one-way valve action is not impaired in the sense of
• the configuration according to the invention also means that in the region of the catheter end on the patent side there is no flow-free cavity or dead space in which highly effective
• the end of the catheter is achieved such that the valve opening is located directly at the end of the catheter cavity, but is still a bit away from the tip of the catheter laterally in the lateral surface.
• valve is thus particularly well protected and is not exposed to the risk of damage or being pressed into the blood vessel when it is pushed forward.
• valve arrangement according to the invention also leads to a consistently smooth and well-rinsed catheter interior, so that there are no spots which present the risk of bacteria accumulation
• the invention is characterized in that the shape of the end of the catheter and the one-way valve and material selection interact in an advantageous manner in order to meet the special requirements of the arterial catheter, as is particularly necessary for the treatment in the area of the leg arteries.
• the catheter is made of soft silicone rubber.
• the catheter When the catheter is placed in the appropriately punctured artery, the catheter is supported in a manner known per se by means of a rigid guide wire 11 (so-called stylet).
• stylet a rigid guide wire 11
• the catheter consists of a tube with an inner tube opening 3 delimited by the tube wall 1.
• the guide wire used may have essentially the thickness of the hose opening 3 and is pushed up to the front-side boundary surface 5 of the hose interior. This boundary surface is essentially flat or
• the silicone rubber used in the embodiment 5 shown essentially has the following material properties:
• the rounded (patient-side) end of the catheter is covered by a cylindrical solid piece 7 '
• the cylindrical Vollstü ⁇ k 7 has the same outer diameter as the hose on its sly wall 1. The length of the cylindrical
• 25 full pieces preferably corresponds approximately to three times the outer diameter of the catheter.
• the catheter is equipped with a one-way valve 9, which from one into the tube wall
• Boundary surface 5 and extends from there to the rear by an amount corresponding to approximately two to three times the catheter diameter.
• the slot Seen in the (not shown) circumferential direction, the slot has no noticeable extension, but the opposite slot walls lie directly against one another and are covered by the
• this cohesion can be achieved with a relatively small internal pressure build-up in the hose opening 3, that is, medication or the like by means of an injection syringe or pressure-limited infusion pump. injected into the hose, overcome. These drugs then exit from the tube opening 3 through the one-way valve formed by the slot 9 to the outside.
• the construction of the one-way valve shown certainly avoids any sucking back of blood into the catheter.
• the construction shown also leads to the end of the tube opening in the region of the catheter end being essentially smooth and without undesired dead spaces. The entire area at the end of the tube opening is well flowed through, so that no drug residues can collect there.
• Inner diameter of the catheter > 1.8 and ⁇ 4 (ideally 2.25).
• hypodermic syringe 5 it can take place if the hypodermic syringe 5 is not allowed to be sucked in, avoided with certainty.
• the slot can be introduced by means of a cutting tool with a narrow blade, which penetrates from the outside in the radial direction
• Slot 9 of the one-way valve can also be used a laser separator.
• Introducing the slot in the valve area is subjected to a "heat treatment.
• the heating takes place between 50 and 250 * for about 30 minutes to 35 two hours, preferably at 180 ° for one hour.

Landscapes

• Health & Medical Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Biophysics (AREA)
• Pulmonology (AREA)
• Engineering & Computer Science (AREA)
• Anesthesiology (AREA)
• Biomedical Technology (AREA)
• Heart & Thoracic Surgery (AREA)
• Hematology (AREA)
• Animal Behavior & Ethology (AREA)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Infusion, Injection, And Reservoir Apparatuses (AREA)
• Media Introduction/Drainage Providing Device (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=6429635

Family Applications (1)

Country Status (2)

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Citations (5)

Family Cites Families (2)

• 1991
  • 1991-04-15 DE DE19914112280 patent/DE4112280A1/de active Granted
• 1992
  • 1992-04-14 WO PCT/DE1992/000308 patent/WO1992018190A1/de not_active Ceased

Patent Citations (5)

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