CN106963990B

CN106963990B - Spring tube with PE coating and preparation method thereof

Info

Publication number: CN106963990B
Application number: CN201710295106.2A
Authority: CN
Inventors: 刘仁忠; 刘超娟; 刘义鹏
Original assignee: Jiangsu Kanghong Metal Hose Co ltd
Current assignee: Jiangsu Kanghong Medical Technology Co.,Ltd.
Priority date: 2017-04-28
Filing date: 2017-04-28
Publication date: 2020-09-29
Anticipated expiration: 2037-04-28
Also published as: CN106963990A

Abstract

The invention belongs to the technical field of spring tubes for medical minimally invasive surgery, and discloses a spring tube with a PE coating, which comprises a spring tube main body and a PE coating coated outside the spring tube main body, wherein the PE coating is made of HDPE and MDPE, the mass fraction of the HDPE is 70-80%, and the mass fraction of the MDPE is 20-30%. The spring tube has smooth surface and good hand feeling, and has small resistance when being inserted in the operation process of a doctor, and the smooth surface can relieve the pain caused by scraping between the surface of the spring tube and the gastrointestinal wall in the operation process of a patient. In addition, zebra stripes can be printed on the surface of the outer layer of the PE, and visibility during insertion is improved. The utility model provides a spring pipe is soft or hard moderate, has certain intensity and ductility, can guarantee that the insertion process is difficult for bending, also can make things convenient for the spring pipe to get into human back simultaneously, and the spring pipe can be along with the change of endoscope pincers way direction and real-time bending, and when the pincers way resumes the straight attitude, the spring pipe automatic recovery.

Description

Spring tube with PE coating and preparation method thereof

Technical Field

The invention belongs to the technical field of spring tubes for minimally invasive medical operations, and particularly relates to a spring tube with a PE coating and a preparation method thereof.

Background

The spring tube for minimally invasive surgery is a small-diameter smooth and flat spring tube produced by adopting a stainless steel wire. The spring tube is a key component of a sampling forceps product, and the sampling forceps product is widely applied to gastroscopy and enteroscopy and treatment in medical instruments, mainly has the functions of clamping pathological tissues in the alimentary canal of a human body so as to test the tissues and simultaneously can also take out polyps or foreign bodies in the alimentary canal

At present, the spring tube adopted in China is mainly a bare tube, the spring tube coated with the PE coating is blank in China, the surface of the bare tube is provided with threads, and the spring tube is obviously scraped with the gastrointestinal wall of a patient when being inserted into a human body, so that the patient is uncomfortable and not beneficial to performing an operation. And because there is the clearance between the bare pipe silk material of spring pipe, get into filth easily in the use, difficult clearance causes the cross infection between the patient easily, can not used repeatedly to cause the extravagant scheduling problem of material.

Disclosure of Invention

In order to solve the defects that the spring tube is not easy to insert and a patient suffers great pain in the prior art, the invention provides the spring tube with the PE coating.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the spring tube with the PE coating comprises a spring tube main body and the PE coating coated outside the spring tube main body, wherein the PE coating is made of HDPE and MDPE, the mass fraction of the HDPE is 70% -80%, and the mass fraction of the MDPE is 20% -30%.

Preferably, the HDPE is 5306J, and the MDPE is TR-130.

The preparation method of the spring tube with the PE coating comprises the following steps: the HDPE raw material and the MDPE raw material are mixed and then added into an extruder, extruded from a die head, contacted with a spring tube main body led out from the die head, pulled to move forward, and cooled by water to form the spring tube with the PE coating.

Further, the temperature of each section of the extruder is set to be 170 ℃, 190 ℃, 220 ℃, 250 ℃ and 270 ℃.

Preferably, the extrusion speed of the extruder is 150m/min, and the traction speed is 300 m/min.

Preferably, the HDPE raw material and the MDPE raw material are extruded by a die head of the extruder and then contact with the main body of the spring tube at a position 12-17 mm in front of the die head.

Further, the water cooling position after extrusion is located 1-1.5 m in front of the die head, and the length of the water tank for water cooling is 0.8-1.2 m. The temperature of the material extruded by the extruder at the position of 1-1.5 m is reduced to 120 ℃ after natural cooling, and then water cooling is carried out, so that the phenomenon that the temperature is reduced too fast before water cooling is avoided.

Furthermore, the thickness of the mixture of the HDPE raw material and the MDPE raw material extruded from the die orifice is 1.4-1.5 mm, and the thickness of the PE coating layer of the spring pipe with the PE coating layer is 0.08-0.12 mm.

Has the advantages that: the PE outer layer has been increased on the basis of traditional spring pipe bare tube in this application, and the surface is smooth, feel good, and the resistance is little when inserting, and the pincers way of intestines and stomach mirror is not fragile to be hurt, and simultaneously, glossy surface can alleviate the scraping to patient's stomach and intestine wall to reduce the discomfort of patient's operation in-process, inside the filth can not get into the spring pipe simultaneously, easily clearance can used repeatedly. Moreover, zebra stripes can be printed on the surface of the outer layer of the PE, so that the visibility during insertion is improved, and the operation of medical personnel is facilitated. This application has the spring pipe soft or hard of PE coating and is moderate, has certain intensity and ductility, in doctor's operation process, can guarantee that the insertion process is difficult for bending, also can make things convenient for the spring pipe to get into human back simultaneously, and the spring pipe can be along with the change of endoscope tong way direction and real-time bending, and when the tong way restores the straight attitude, the spring pipe automatic recovery. The product and the preparation method fill the domestic blank, and are unique in China.

Detailed Description

Example 1

Mixing HDPE master batch with the grade of 5306J and MDPE master batch with the grade of TR-130 according to the mass ratio of 7:3, and performing melt extrusion through a screw extruder, wherein the temperature of each section of the extruder is set to be 170 ℃, 190 ℃, 220 ℃, 250 ℃ and 270 ℃. The mixed material is extruded by a die head of an extruder, is in contact with a spring tube main body led out from the center of a core rod in the die head and is stretched and pulled under the action of a traction force, wherein the extruded material is in contact with the spring tube main body at a position 15mm away from the front part of the die head, the thickness of the extruded material is 1.4mm, the extruded material is gradually stretched and coated outside the spring tube main body under the action of the traction force, the extrusion speed of the material is 150m/min, and the traction speed is 300 m/min. And (3) in the traction and stretching process, the material enters a water tank at the position of 1.2m in front of the die head for cooling, the length of the water tank is 1m, the material is wound after cooling, and the spring pipe with the PE coating is prepared, wherein the thickness of the final PE coating is 0.1 mm.

Example 2

Mixing HDPE master batch with the grade of 5306J and MDPE master batch with the grade of TR-130 according to the mass ratio of 3:1, and performing melt extrusion through a screw extruder, wherein the temperature of each section of the extruder is set to be 170 ℃, 190 ℃, 220 ℃, 250 ℃ and 270 ℃. The mixed material is extruded by a die head of an extruder, is in contact with a spring tube main body led out from the center of a core rod in the die head and is stretched and pulled under the action of a traction force, wherein the extruded material is in contact with the spring tube main body at the position 12mm in front of the die head, the thickness of the extruded material is 1.5mm, the extruded material is gradually stretched and coated outside the spring tube main body under the action of the traction force, the extrusion speed of the material is 150m/min, and the traction speed is 300 m/min. And (3) in the process of traction and stretching, the material enters a water tank at the position 1m in front of the die head for cooling, the length of the water tank is 1.2m, the material is cooled and then wound, and the spring pipe with the PE coating is prepared, wherein the thickness of the final PE coating is 0.08 mm.

Example 3

Mixing HDPE master batch with the grade of 5306J and MDPE master batch with the grade of TR-130 in a mass ratio of 4:1, and performing melt extrusion through a screw extruder, wherein the temperature of each section of the extruder is set to be 170 ℃, 190 ℃, 220 ℃, 250 ℃ and 270 ℃. The mixed material is extruded by a die head of an extruder, is in contact with a spring tube main body led out from the center of a core rod in the die head and is stretched and pulled under the action of traction force, wherein the extruded material is in contact with the spring tube main body at a position 17mm in front of the die head, the thickness of the extruded material is 1.5mm, the extruded material is gradually stretched and coated outside the spring tube main body under the action of the traction force, the extrusion speed of the material is 150m/min, and the traction speed is 300 m/min. And (3) in the process of traction and stretching, the steel pipe enters a water tank at the position of 1.5m in front of the die head for cooling, the length of the water tank is 0.8m, the steel pipe is rolled after cooling, and the spring pipe with the PE coating is prepared, wherein the thickness of the final PE coating is 0.12 mm.

Comparative example 1

The HDPE raw material grade in example 1 was changed to Q281, and the other steps were the same as in example 1.

The PE-coated spring tube prepared in examples 1 to 3 was wound around the circumference of a coin, the PE coating on the surface of the spring tube did not crack and immediately returned to the original vertical state after being released, whereas the PE-coated spring tube prepared in comparative example 1 was not immediately returned to the vertical state after being released around the circumference of a coin. In addition, through experimental comparison, the spring tube with the PE coating prepared in the embodiment 1-3 has a smooth surface and a good hand feeling, is smooth when being inserted into a gastrointestinal tract, can keep a good vertical state when being inserted while ensuring elasticity, is not easy to bend, and is beneficial to insertion; the spring tube with the PE coating prepared in the reference 1 is not smooth enough in hand feeling, has a large frictional resistance with a gastrointestinal endoscope channel during insertion, is difficult to insert, is easy to bend during insertion, cannot keep a vertical state, is difficult to insert, and is inconvenient to operate.

Claims

1. A spring tube having a PE coating, comprising: the spring tube comprises a spring tube main body and a PE coating coated outside the spring tube main body, wherein the PE coating is made of HDPE and MDPE, the mass fraction of the HDPE is 70-80%, and the mass fraction of the MDPE is 20-30%;

the HDPE is 5306J, the MDPE is TR-130, and the spring tube is for minimally invasive medical surgery.

2. The method of making a spring tube having a PE coating as defined in claim 1, wherein: mixing an HDPE raw material and an MDPE raw material, adding the mixture into an extruder, extruding the mixture from a die head, contacting a spring tube main body led out from the die head, advancing under the action of traction, and forming a spring tube with a PE coating after water cooling; after the HDPE raw material and the MDPE raw material are extruded by a die head of an extruder, the HDPE raw material and the MDPE raw material are in contact with the main body of the spring tube at a position 12-17 mm in front of the die head; the water cooling position is located 1-1.5 m in front of the die head, and the length of the water cooling water tank is 0.8-1.2 m.

3. The method of making a spring tube having a PE coating as defined in claim 2, wherein: the temperature of each section of the extruder is respectively set to be 170 ℃, 190 ℃, 220 ℃, 250 ℃ and 270 ℃.

4. The method of manufacturing a spring tube with a PE coating according to claim 2 or 3, characterized in that: the extrusion speed of the extruder is 150m/min, and the traction speed is 300 m/min.

5. The method of making a spring tube having a PE coating as defined in claim 2, wherein: the thickness of the mixture of the HDPE raw material and the MDPE raw material extruded from the die is 1.4-1.5 mm, and the thickness of the PE coating layer of the spring pipe with the PE coating layer is 0.08-0.12 mm.