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A sleeve-type elastic porous piezoresistive sensor for ureteral injury detection

A piezoresistive sensor, sleeve-type technology, applied in sensors, applications, gymnastics equipment, etc., can solve problems such as ureteral injury, urine leakage or hematuria, ureter accidental injury, etc.

Active Publication Date: 2020-10-16
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the current open operations such as rectal and hysterectomy, due to the complex anatomy, the surgical personnel often cause accidental injury to the ureter during operations such as hemostasis, mass clamping, and ligation.
However, at present, there is a lack of technical means for detecting ureteral injury during surgery, and most of the judgments are based on experience, which has great risks and uncertainties
About 5%-30% of hysterectomies have caused ureteral injury every year, and urine leakage or hematuria are often detected after the abdomen is closed after the operation, which has caused many unnecessary medical burdens

Method used

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  • A sleeve-type elastic porous piezoresistive sensor for ureteral injury detection
  • A sleeve-type elastic porous piezoresistive sensor for ureteral injury detection
  • A sleeve-type elastic porous piezoresistive sensor for ureteral injury detection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: Preparation of a sleeve-type elastic porous structure piezoresistive sensor with a sleeve thickness of 1 mm.

[0028] Concrete preparation is carried out as follows:

[0029] 1. Weigh a certain amount of acetylene black and blowing agent, and mix them evenly to form a solid mixture;

[0030] 2. Add the solid mixture to Ecoflex 00-30A and B with a mass ratio of 1:1, and add surfactant AEO-9, and mix thoroughly to obtain a mixture;

[0031] 3. Fill the obtained mixture into a clean mold to form a jelly. The inner and outer diameters of the mold are 3mm and 6mm respectively;

[0032] 4. Insulate the sample obtained in step 3 at 60°C for 2 hours to completely foam and solidify to obtain a pressure-sensitive layer with a porous structure;

[0033] 5. After removing the inner shell in the mold, paste flexible electrode layers on the inner and outer walls of the pressure-sensitive layer, fill in Ecoflex00-30 and cure and encapsulate at 60°C to make a sleeve-type p...

Embodiment 2

[0034] Example 2: Preparation of a sleeve-type elastic porous structure piezoresistive sensor with a sleeve thickness of 2 mm.

[0035] Concrete preparation is carried out as follows:

[0036] 1. Weigh a certain amount of acetylene black and blowing agent, and mix them evenly to form a solid mixture;

[0037] 2. Add the solid mixture to Ecoflex 00-30A and B with a mass ratio of 1:1, and add surfactant C8S, and mix thoroughly to obtain a mixture;

[0038] 3. Fill the obtained mixture into a clean mold to form a jelly. The inner and outer diameters of the mold are 3mm and 7mm respectively;

[0039] 4. Insulate the sample obtained in step 3 at 60°C for 2 hours to completely foam and solidify to obtain a pressure-sensitive layer with a porous structure;

[0040]5. After removing the inner shell in the mold, paste flexible electrode layers on the inner and outer walls of the pressure-sensitive layer, fill in Ecoflex00-30 and cure and encapsulate at 60°C to make a sleeve-type piez...

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Abstract

The invention discloses a sleeve-type elastic porous piezoresistive sensor for detecting ureter damage. By using a composite material formed of an elastic material and a conductive phase as a base body, a porous structure is prepared by chemical foaming. After curing in a special mold, a sleeve-type pressure-sensitive layer is obtained by de-molding. Compared with an existing porous structure piezoresistive sensor, the piezoresistive sensor of the invention uses a sleeve-type structure, has good elasticity, overcomes the defects that other conventional piezoresistive sensors are difficult to be used in a surgical environment, can firmly sleeve related surgical forceps, and can be especially used for detecting the peristaltic systolic pressure in surgical operations. Because of a flexible characteristic, the sleeve-type elastic porous piezoresistive sensor can ensure the firm combination of the sleeve and the surgical forceps, and can well respond to changes in the pressure signal in the ureter, The method is simple and easy to operate, low in cost, superior in performance, and has large practical requirements in the application field, and a good application prospect.

Description

technical field [0001] The invention belongs to the field of flexible and stretchable piezoresistive sensors, and in particular relates to a method for preparing an elastic porous piezoresistive sensor with a sleeve-type structure. The piezoresistive sensor uses a conductive layer with a sleeve-type porous structure as a pressure-sensitive layer. The head of surgical forceps can be tightened, which can be conveniently used for detection of ureteral damage. Background technique [0002] The ureter is an important part of the human urinary system, connecting the renal pelvis above and the bladder below. [0003] The peristalsis of the ureter is the result of muscle contraction caused by changes in the electrical potential of the ureteral smooth muscle. The pacemaker point of peristalsis, that is, the site where peristalsis starts, is the renal pelvis junction under normal circumstances; but when the ureter is directly stimulated (such as surgery, instruments, stones, tumors, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L41/23H01L41/35H01L41/16A61B5/00A61B5/20A61B5/22
Inventor 王宗荣李皓盛陈国瑞王珊张震岳简阅许露杭周麟铭王子琦苗雨欣董亚波王洪柱杜丕一
Owner ZHEJIANG UNIV
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