CN111840748A - Peripherally passed central venous catheter and preparation method thereof - Google Patents

Peripherally passed central venous catheter and preparation method thereof Download PDF

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Publication number
CN111840748A
CN111840748A CN201910334981.6A CN201910334981A CN111840748A CN 111840748 A CN111840748 A CN 111840748A CN 201910334981 A CN201910334981 A CN 201910334981A CN 111840748 A CN111840748 A CN 111840748A
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China
Prior art keywords
opening
catheter
peripherally
withdrawal
central catheter
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CN201910334981.6A
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Chinese (zh)
Inventor
高仁伟
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Zhongzhifeng Suzhou Medical Technology Co ltd
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Zhongzhifeng Suzhou Medical Technology Co ltd
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Priority to CN201910334981.6A priority Critical patent/CN111840748A/en
Publication of CN111840748A publication Critical patent/CN111840748A/en
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    • 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
    • A61M25/0043—Catheters; Hollow probes characterised by structural features
    • 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
    • A61M25/0009—Making of catheters or other medical or surgical tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils

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

Abstract

The invention provides a peripherally inserted central venous catheter, wherein an input opening and a withdrawal opening are arranged on the side wall of the catheter at the proximal end; during positive pressure transfusion, the input opening is opened, and the pumping-back opening is closed; when the negative pressure is pumped back, the pumping-back opening is opened, and the input opening is closed; at equilibrium, both the inlet opening and the withdrawal opening are in a closed state. According to the peripherally inserted central venous catheter, the input opening and the withdrawal opening are respectively provided with the one-way opening, so that the use safety and effectiveness are improved, and poor withdrawal and valve closing in the long-term use process are avoided.

Description

Peripherally passed central venous catheter and preparation method thereof
Technical Field
The invention belongs to the field of medical appliances, and particularly relates to a peripherally inserted central venous catheter and a preparation method thereof.
Background
Through peripheral central venous catheter (PICC), utilize the pipe to puncture from the vein of peripheral arm, the pipe directly reaches the great vein that is close to the heart, avoids the direct contact of chemotherapy medicine and arm vein, and the blood flow rate of great vein is very fast, can wash the thinning treatment medicine fast, prevents that the medicine from to the stimulation of blood vessel, in recent years gradually obtains wide application in the postoperative clinic.
At present, through peripheral central venous catheter, for infusion and pumpback, the mode of three-way valve is adopted to the mode of commonly using, and the valve is inwards opened during negative pressure, can draw blood, and the valve is outwards opened during positive pressure, can infuse, and the balance is that the valve is closed, has avoided air embolism, the palirrhea or the coagulation risk of blood. US4671769 discloses an intravenous catheter, wherein the catheter wall is cut along the central axis, the two sides of the cut are completely symmetrical, the cut acts as a valve, when blood is drawn, the inner cavity of the catheter forms negative pressure, the two sides of the cut are concave at the same time, when transfusion is carried out, the inner cavity of the catheter forms positive pressure, the cut is convex outwards, and when balanced, the cut is in a natural closed state.
The method adopts the same opening for transfusion and withdrawal through the peripheral central venous catheter, and the problems of poor withdrawal or untight closing, blood seepage and the like are easily caused by aging due to repeated action in different directions for a long time.
Disclosure of Invention
In order to overcome the problems that the infusion and the back suction through the peripheral central venous catheter adopt the same opening and are easy to age due to repeated action in different directions for a long time, so that the back suction is poor or the back suction is not closed tightly to cause blood seepage and the like in the prior art, the invention provides the peripheral central venous catheter with the following scheme and a preparation method thereof:
A peripherally inserted central venous catheter, the side wall of the catheter at the proximal end of the catheter being provided with an inlet opening and a withdrawal opening; during positive pressure transfusion, the input opening is opened, and the pumping-back opening is closed; when the negative pressure is pumped back, the pumping-back opening is opened, and the input opening is closed; at equilibrium, both the inlet opening and the withdrawal opening are in a closed state.
Optionally, opening direction line and pipe axis form the angle that is less than 90 degrees, the opening both sides are elastic end and stiff end respectively, the elastic end is compared the stiff end easily takes place elastic deformation, along intraductal direction, input open-ended elastic end covers the stiff end, the open-ended stiff end of pumpback covers the elastic end.
Optionally, the angle is 45-75 degrees.
Optionally, the shore hardness of the elastic end material is 30-60 degrees, and the shore hardness of the fixed end is more than 1.5 times of the shore hardness of the elastic end.
Optionally, the thickness of the conduit is 0.2-0.4 mm, and the outer diameter of the pipe is 0.6-1.5 mm.
Optionally, the opening is in a circumferential direction of the tube.
Optionally, the length of the opening in the circumferential direction is 1/4-1/3 of the circumferential length.
Optionally, the distance between the opening and the pipe head end is 4-6 mm.
Optionally, the catheter material is medical polyurethane or silicone rubber.
The preparation method of the peripherally inserted central catheter comprises the following steps: through the mode of alternative feed extrusion, form the body through the central ductus venosus of periphery in through the central ductus venosus of periphery mould the near tube head end of body forms hard section, soft section and hard section in proper order, forms at hard section and soft section junction incision input opening and draw back the opening.
Compared with the prior art, the scheme of the invention has the following advantages: the input opening and the withdrawal opening are respectively provided with one-way openings, so that the use safety and effectiveness are improved, and poor withdrawal and valve closing in the long-term use process are avoided.
Drawings
FIG. 1 is a schematic view of a prior art peripherally inserted central catheter;
FIG. 2 is a schematic view of a peripheral central venous catheter in accordance with an embodiment of the present invention;
FIG. 3 is a schematic view of another embodiment of a peripheral central venous catheter of the present invention;
Detailed Description
In order to make the features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 1, a conventional peripherally inserted central venous catheter comprises a catheter tube 11, a side wall of the tube 11 near the tip end is provided with an opening 12 along the central axis, and the central venous catheter passes through the opening 12 for infusion and withdrawal, so that the repeated action of the same opening in different directions for a long time is likely to cause aging, resulting in poor withdrawal or poor closure, causing blood seepage and other problems.
To solve the above problems, the present invention provides a peripherally inserted central catheter, as shown in fig. 2, comprising a catheter tube 21, wherein the proximal end of the catheter tube 21 is provided with an inlet opening 22 and a withdrawal opening 23; during positive pressure transfusion, the input opening 22 is opened, and the withdrawal opening 23 is closed; when the negative pressure is pumped back, the pumping-back opening 23 is opened, and the input opening 22 is closed; at equilibrium, both the inlet opening 22 and the withdrawal opening 23 are closed.
When the negative pressure in the catheter is lower than-7 mmHg through the peripheral central venous catheter, the withdrawing opening 23 is opened inwards, the input opening 22 is closed, and blood samples can be extracted; the pressure in the catheter is more than 80mmHg, at this time, the input opening 22 is opened, the input opening is opened outwards, the withdrawal opening 23 is closed, and the liquid medicine is allowed to enter the human body; when the pressure range is between-7 mm and 80mm, namely the catheter is not used, the withdrawing opening 23 and the input opening 22 are closed, blood backflow is prevented, and blood coagulation can be prevented from blocking the catheter in the clinical use process.
The peripherally inserted central catheter according to an embodiment of the present invention, further, as shown in fig. 3, includes a catheter body 31, wherein the proximal end of the catheter body 31 is provided with an input opening 32 and a withdrawal opening 33 on the side wall; opening direction line 39,40, the opening direction line 39 of input opening 32 and the opening direction line 40 of drawing back opening 33 form the angle that is less than 90 degrees with pipe axis 38 promptly, the opening both sides are elasticity end 34,36 and stiff end 35,37 respectively, elasticity end 34,36 ratio stiff end 35,37 easily take place elastic deformation, along intraductal direction, input opening's elasticity end covers the stiff end, draw back open-ended stiff end 35,37 and cover elasticity end 34, 36. Through the design, when positive pressure transfusion is carried out, the input opening 32 can be ensured to be opened, and the withdrawal opening 33 is closed; when the negative pressure is pumped back, the pumping-back opening 33 is opened, and the input opening 32 is closed; at equilibrium, both the inlet opening 32 and the withdrawal opening 33 are closed.
In the peripherally inserted central catheter according to an embodiment of the present invention, as shown in fig. 3, the inlet opening 32 and the withdrawal opening 33 are circumferentially oriented along the tube, which facilitates the preparation of one-way control openings for the inlet opening 32 and the withdrawal opening 33, which are not strictly circumferentially oriented along the tube, and which allow a certain deviation, typically not exceeding 30 degrees, and preferably not exceeding 10 degrees. The inlet opening 32 and the withdrawal opening 33 may or may not be on the same circumference, and usually not on the same circumference, so as to prevent the catheter from being damaged more easily due to the concentration of the openings if the inlet opening 32 and the withdrawal opening 33 are on the same circumference. The inlet opening 32 and the withdrawal opening 33 may be on the same side or on different sides, and may be set according to specific practical requirements, and usually the distance between the openings 32,33 and the tube head end is 4-6 mm.
In the peripherally inserted central catheter according to the embodiment of the present invention, as shown in fig. 3, the opening direction lines 39,40 are lines in which the incision directions of the openings 32,33 are formed, and the angle formed by the opening direction line 39 of the inlet opening 32 and the tube axis 38 and the angle formed by the opening direction line 40 of the withdrawal opening 33 and the tube axis 38 may be the same or different. In order to better ensure the unidirectional opening and closing action of the input opening 32 and the withdrawal opening 33, the opening direction lines 39,40 form an angle of 45-75 degrees with the tube axis 38.
According to the peripherally inserted central catheter of the embodiment of the invention, the length of the opening along the circumferential direction is 1/4-1/3 of the circumferential length, the circumference refers to the excircle circumference of the catheter, the control of one-way opening and closing of the input opening 32 and the withdrawal opening 33 is not facilitated when the opening is too long or too short, and the catheter is easily damaged when the opening is too long.
In the peripherally inserted central venous catheter according to the embodiment of the present invention, as shown in fig. 3, the elastic ends 34,36 are made of an elastic material having a shore hardness of 30 to 60 degrees, so that the peripherally inserted central venous catheter is obtained, and the openings 32,33 are prevented from bleeding when the openings are closed, and the fixed ends 35,37 are made of the same elastic material, but the shore hardness of the material of the fixed ends 35,37 is 1.5 times or more, preferably 2 to 4 times, the shore hardness of the material of the elastic ends 34,36 is larger than that of the material of the elastic ends 34,36, and the openings 32,33 can be controlled by elastic deformation of the elastic ends 34,36 during infusion or withdrawal.
In the peripherally inserted central catheter according to an embodiment of the present invention, the elastic material is generally a medical polymer elastic material, and particularly preferably polyurethane or silicone rubber.
The peripherally inserted central catheter according to an embodiment of the present invention has a thickness of 0.2 to 0.4mm and an outer diameter of 0.6 to 1.5 mm.
In the peripherally inserted central catheter according to an embodiment of the present invention, the number of the inlet opening 32 and the withdrawal opening 33 may be 1 or more, and may be set in a plurality of ways, typically 1 each, according to the need.
The present invention further provides a specific embodiment of the above method for preparing a peripherally inserted central catheter, with continued reference to fig. 3, the method comprising the steps of: the tube body 31 passing through the peripheral central venous catheter is formed in a die passing through the peripheral central venous catheter by means of alternate feeding and extrusion, a hard section 41, a soft section 42 and a hard section 43 are sequentially formed at the proximal end of the tube body 31, cuts are made at the joints of the hard sections 41,43 and the soft section 42 according to the directions of opening direction lines 39 and 40, fixed ends 35 and 37 are formed at the hard sections 41 and 43, and elastic ends 34 and 36 are formed at the soft section 42, so that the input opening 32 and the drawing-back opening 33 are formed.
According to the preparation method of the peripherally inserted central venous catheter, the incision operation is carried out through a special tool, specifically, the peripherally inserted central venous catheter body is placed at the position of a cutter of the special tool, and the incision is carried out through a computer-controlled tool according to the design of a drawing.
In the method of manufacturing a peripherally inserted central catheter according to an embodiment of the present invention, the flexible end of the inlet opening and the flexible end of the withdrawal opening may be formed on the same soft segment or on different soft segments.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. A peripherally inserted central catheter, wherein the proximal end of the catheter has an inlet opening and a withdrawal opening in its sidewall; during positive pressure transfusion, the input opening is opened, and the pumping-back opening is closed; when the negative pressure is pumped back, the pumping-back opening is opened, and the input opening is closed; at equilibrium, both the inlet opening and the withdrawal opening are in a closed state.
2. The peripherally inserted central catheter of claim 1, wherein the opening line forms an angle of less than 90 degrees with the axis of the catheter, the opening being flanked by an elastic end and a fixed end, the elastic end being more elastically deformable than the fixed end, the elastic end of the input opening covering the fixed end and the fixed end of the withdrawal opening covering the elastic end in the direction of the catheter.
3. The peripherally-located central catheter of claim 2, wherein the angle is 45-75 degrees.
4. The peripherally inserted central catheter of claim 2, wherein the shore hardness of the material of the resilient end is 30-60 degrees, and the shore hardness of the securing end is greater than or equal to 1.5 times the shore hardness of the resilient end.
5. The peripherally-displaced central catheter of claim 1, wherein the catheter has a thickness of 0.2-0.4 mm and an outer tube diameter of 0.6-1.5 mm.
6. The peripherally-located central catheter of claim 2, wherein the opening is in a circumferential direction of the tube.
7. The peripherally-located central catheter of claim 6, wherein the length of the opening in the circumferential direction is 1/4-1/3 of the circumferential length.
8. The peripherally-located central catheter of claim 1, wherein the opening is spaced from the tip end by a distance of 4-6 mm.
9. The peripherally-located central catheter of claim 1, wherein the catheter material is medical polyurethane or silicone rubber.
10. The method of making a peripherally inserted central catheter of any one of claims 1-9, comprising the steps of: through the mode of alternative feed extrusion, form the body through the central ductus venosus of periphery in through the central ductus venosus of periphery mould the near tube head end of body forms hard section, soft section and hard section in proper order, forms at hard section and soft section junction incision input opening and draw back the opening.
CN201910334981.6A 2019-04-24 2019-04-24 Peripherally passed central venous catheter and preparation method thereof Pending CN111840748A (en)

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CN201910334981.6A CN111840748A (en) 2019-04-24 2019-04-24 Peripherally passed central venous catheter and preparation method thereof

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023022944A1 (en) * 2021-08-19 2023-02-23 Luther Needlesafe Products, Llc System and method for assembly of a low profile passive protector for an i.v. catheter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023022944A1 (en) * 2021-08-19 2023-02-23 Luther Needlesafe Products, Llc System and method for assembly of a low profile passive protector for an i.v. catheter

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