CN115886769A

CN115886769A - Pressure measuring catheter that tensile was dragged

Info

Publication number: CN115886769A
Application number: CN202211400106.1A
Authority: CN
Inventors: 潘冰; 覃浪; �田宏
Original assignee: Chongqing Jinshan Medical Technology Research Institute Co Ltd
Current assignee: Chongqing Jinshan Medical Technology Research Institute Co Ltd
Priority date: 2022-11-09
Filing date: 2022-11-09
Publication date: 2023-04-04

Abstract

The invention discloses a tensile pressure measuring catheter which comprises a stressed connecting piece and a plurality of pressure measuring units connected in sequence, wherein each pressure measuring unit comprises a sensor carrier and a hollow pipe which are connected; one end of the stressed connecting piece is connected with the sensor carrier, and the other end of the stressed connecting piece is connected with the other sensor carrier or the rigid stressed piece. The invention aims to solve the technical problem of developing a pull-resistant pressure measuring catheter with more accurate pressure measurement and higher integrity and connection reliability.

Description

Pressure measuring catheter that tensile was dragged

Technical Field

The invention relates to the technical field of high-resolution gastroesophageal manometry catheters, in particular to a tension-resistant manometry catheter.

Background

Currently, gastroesophageal diseases are on a trend of increasing and frequently occurring year by year, most of gastroesophageal organic lesions and partial dynamic diseases can only be detected by conventional rash treatment technologies such as gastroscope and digestive tract radiography technologies, but most of the gastroesophageal abnormal dynamic diseases such as gastroesophageal reflux disease, cardia achalasia and the like can not be described and evaluated systematically, accurately and visually, high-resolution esophageal manometry (HRM) technology is usually adopted for detection, solid manometry catheters commonly used on the market at present are divided into a capacitance type pressure sensor and a resistance type pressure sensor, the difficulties of complex process, high cost and the like exist, and the problems of small manometry angle, poor accuracy, easy fracture, narrow coverage and the like exist.

Meanwhile, the gastroesophageal tract of a human body has bending change, so that the pressure measuring catheter is required to keep certain flexible bending performance, but certain resistance exists when the pressure measuring catheter enters or exits the gastroesophageal tract, the pressure measuring catheter is required to bear the pressure in the gastroesophageal tract, the pressure measuring catheter is required to have certain integrity and connection reliability, the pressure measuring catheter is required to be prevented from being stretched and prolonged or even pulled and broken, and inaccurate measurement and medical accidents are prevented from being caused.

Accordingly, those skilled in the art have sought to develop a tear resistant pressure catheter that provides more accurate pressure measurement and greater integrity and connection reliability.

Disclosure of Invention

In view of the above defects in the prior art, the invention discloses a pull-resistant pressure measurement catheter, and aims to provide a pull-resistant pressure measurement catheter with more accurate pressure measurement, higher integrity and connection reliability.

In order to achieve the purpose, the invention provides a pulling-resistant pressure measuring catheter which comprises a stressed connecting piece and a plurality of pressure measuring units connected in sequence, wherein each pressure measuring unit comprises a sensor carrier and a hollow pipe which are connected; one end of the stressed connecting piece is connected with the sensor carrier, and the other end of the stressed connecting piece is connected with the other sensor carrier or the rigid stressed piece.

Preferably, the sensor carrier is provided with a first through hole in the axial direction, and the rigid force-receiving member is provided with a second through hole in the axial direction.

Preferably, the tail ends of the connected pressure measuring units are connected with rubber tubes, the rubber tubes are located outside the body during pressure measurement, the other ends of the rubber tubes are connected with the transfer device, and the rigid stress pieces are arranged in the transfer device or in the rubber tubes. The stressed connecting piece can be connected and fixed with two sensor carriers at two ends respectively, or can be connected and fixed with the sensor carriers at one end and the other end on the independent rigid stressed piece, so that the rubber pipe can be partially or completely supported, and the anti-pulling performance of the rubber pipe is improved.

Preferably, in order to facilitate the insertion into the natural cavity of the human body, the head ends of the connected pressure measuring units are connected with insertion heads, one end of each insertion head is closed, and the other end of each insertion head is a connector matched with the sensor carrier. Specifically, the insertion head is of a smooth transition solid conical structure with one closed end, a connector at the other end of the insertion head is connected with a sensor carrier of a first pressure measuring unit, the first pressure measuring unit is connected with a second pressure measuring unit, and the like until the insertion head is connected to an Nth pressure measuring unit, the other end of the last pressure measuring unit is connected with a rubber tube and then connected to a transfer device, and the transfer device is connected with data analysis equipment. And the cable formed by the lead of the former pressure measuring unit sequentially passes through the hollow pipe and then passes through the hollow pipe of the latter pressure measuring unit until the tail end pressure measuring unit and the hollow pipe penetrate out. The insertion head and the hollow tube are made of flexible materials, and the flexible materials are preferably polyethylene, polypropylene, polyamide, polyurethane, silica gel and the like.

Preferably, one end of the sensor carrier is provided with a connecting hole, one end of the rigid stress piece is provided with a fixing hole, and both the connecting hole and the fixing hole can be used for fixing the end part of the stress connecting piece.

Preferably, the rigid stress part comprises a limiting ring, the two sides of the limiting ring are provided with connecting rings, the second through hole is formed in the limiting ring and the two connecting rings, anti-skid convex rings are arranged outside the two connecting rings, and one connecting ring is provided with the fixing hole.

Preferably, the end of the force-receiving connector may be fixed to the inner wall of the first through hole or the second through hole.

The stressed connecting piece can be connected with a connecting hole of the sensor carrier or a fixing hole of the rigid stressed piece in a winding and binding mode; or fixed on the inner wall of the first through hole of the sensor carrier or the inner wall of the second through hole of the rigid stress piece by glue fixation, welding fixation or the like.

Preferably, the stressed connecting piece is a connecting line section made of bendable, tensile and inelastic materials. The length of the stressed connecting piece is less than or equal to the natural length of the fixed pressure measuring unit, and the material of the stressed connecting piece is usually wire harness or steel wire and the like.

Preferably, the sensor carrier includes the installation department, the both ends of installation department are connecting portion, and installation department and connecting portion have with the first through-hole of axial cavity, are equipped with the holding tank on the installation department, the quantity of holding tank is a plurality of, and the circumference equipartition of installation department is followed to a plurality of holding tanks, through the quantity that increases the holding tank, makes the quantity of sensor increase to can realize 360 pressure detection to axial periphery. The bottom of holding tank is equipped with pin hole and air vent, and pressure sensor's wire passes through in the pin hole penetrates the through-hole. In addition, the diameter of installation department is greater than the diameter of connecting portion, and the connecting portion are equipped with protruding structure outward, and the installation department at both ends can insert respectively and form to connect in the hollow tube of bendable back again to the installation department of next sensor carrier and establish ties in proper order, forms the pressure measurement pipe. The protruding structure is annular protrusion, can increase frictional force when connecting the hollow tube, guarantees the fastness of connecting, prevents that sensor carrier and hollow tube separation from droing.

Furthermore, the pressure sensor is a semiconductor resistance type pressure sensor made of monocrystalline silicon, according to the piezoresistive effect of the monocrystalline silicon, a strain resistance circuit on an elastic diaphragm of the pressure sensor generates resistance value change along with mechanical deformation, and a strain signal is transmitted to the outside through a corresponding circuit of the sensor. One side of an elastic diaphragm of the pressure sensor is communicated with reference pressure (in the case, atmospheric pressure) to form reference, and the other side of the elastic diaphragm is a sensing side for sensing pressure change. The pressure sensor is arranged in the accommodating groove, the rear sensing side faces the outer circumferential surface of the sensor carrier, and the reference side faces the circle center. The bottom of the accommodating groove at the position corresponding to the reference side of the pressure sensor is provided with at least one vent hole communicated with the atmosphere, so that the reference side is conveniently communicated with the atmosphere. The conductors are typically insulated cables, each pressure sensor is electrically connected directly or indirectly using other conductive material to one end of a separate set of conductors, and at least three conductors are connected to each pressure sensor.

Preferably, the outer side surface of the pressure sensor is coated with a soft sticky block, the soft sticky block can be used as a medium for transmitting external pressure, so that the pressure transmission is more sensitive, meanwhile, the sensing side outside the pressure sensor can be protected from being damaged by external force, and the connection between the pressure sensor and the lead can be protected from being damaged. The soft adhesive mass is preferably coated with a biocompatible medical adhesive on the surface of the pressure sensor.

The beneficial effects of the invention are:

the sensor carriers of the pressure measuring units which are fixedly arranged on the pressure measuring guide pipes more than two at least are respectively connected with the two ends of the stressed connecting piece, the stressed connecting piece is used for bearing the tensile stress of the length direction of the pressure measuring guide pipes, so that the pressure measuring units connected in a fixed range can not be expanded and extended to be lengthened after being limited when being stretched by external force, the effect of preventing the pressure measuring guide pipes, wires and the like from being pulled and broken is achieved, and the integrity and the connection reliability are improved. Meanwhile, one end of the stressed connecting piece can be connected with the sensor carrier, the other end of the stressed connecting piece extends backwards to the tail end of the pressure measuring unit or a rubber pipe connected with the pressure measuring unit, the other end of the stressed connecting piece is fixed through the rigid stressed piece, the overall connection reliability is further enhanced, the overall extension is avoided, and the integrity and the connection reliability are higher. On the other hand, through setting up the sensor carrier, can fix pressure sensor's position to and protect pressure sensor etc. for the pressure measurement result is more accurate.

Drawings

FIG. 1 is a schematic view of a portion of the external structure of a pressure sensing catheter according to the present invention;

FIG. 2 is a schematic view of a portion of the internal structure of the pressure sensing catheter of the present invention;

FIG. 3 is a schematic view of the overall configuration of the pressure sensing catheter of the present invention;

FIG. 4 is a schematic view of the configuration of the insertion head of the pressure catheter of the present invention;

FIG. 5 is a schematic view of the construction of the rigid force-bearing member of the pressure sensing catheter of the present invention;

FIG. 6 is a schematic diagram of the construction of a sensor carrier of the pressure sensing catheter of the present invention;

FIG. 7 is a schematic view, partially in section, of a pressure catheter of the present invention.

In the above drawings: 1. a sensor carrier; 11. an installation part; 111. accommodating grooves; 112. a wire hole; 113. a vent hole; 12. a connecting portion; 121. a protruding structure; 122. connecting holes; 13. a first through hole; 2. a hollow tube; 3. a stressed connector; 4. a rigid force-bearing member; 41. a limiting ring; 42. a connecting ring; 421. an anti-slip convex ring; 43. a second through hole; 44. a fixing hole; 5. a hose; 6. a transfer device; 7. an insertion head; 71. a connector; 8. a pressure sensor; 81. and (4) conducting wires.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and examples, wherein the terms "upper", "lower", "left", "right", "inner", "outer", and the like are used in the description of the invention to indicate orientations and positional relationships based on those shown in the drawings, and are used for convenience in describing the invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular manner, and therefore should not be construed as limiting the invention. The terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

As shown in fig. 1 and 2, the invention provides a pulling-resistant pressure measuring catheter, which comprises a stress connecting piece 3 and a plurality of pressure measuring units connected in sequence, wherein each pressure measuring unit comprises a sensor carrier 1 and a hollow pipe 2 which are connected; one end of the stressed connecting piece 3 is connected with the sensor carrier 1, and the other end of the stressed connecting piece 3 is connected with the other sensor carrier 1 or the rigid stressed piece 4. The stressed connecting piece 3 is a connecting line section made of bendable, anti-pulling and inelastic materials, the length of the stressed connecting piece 3 is smaller than or equal to the natural length of the fixed pressure measuring unit, and the materials of the stressed connecting piece 3 are usually wire harnesses or steel wires and the like.

As shown in fig. 3, the tail ends of the connected pressure measuring units are connected with rubber tubes 5, the rubber tubes 5 are located outside the body during pressure measurement, the other ends of the rubber tubes 5 are connected with a transfer device 6, and the rigid stress members 4 are arranged in the transfer device 6 or the rubber tubes 5. The stressed connecting piece 3 can be connected and fixed with the two sensor carriers 1 at two ends respectively, or can be connected and fixed with the sensor carriers 1 at one end and the other end on the independent rigid stressed piece 4, so that the rubber tube 5 can be partially or completely supported, and the anti-pulling performance of the rubber tube 5 is improved.

Meanwhile, in order to facilitate the insertion into the natural cavity of the human body, the head ends of the connected pressure measuring units are connected with insertion heads 7, as shown in fig. 4, one end of each insertion head 7 is closed, and the other end of each insertion head 7 is provided with a connector 71 matched with the sensor carrier 1. Specifically, the insertion head 7 is a smooth transition solid conical structure with one end closed, the connector 71 at the other end of the insertion head 7 is connected with the sensor carrier 1 of the first pressure measuring unit, the first pressure measuring unit is connected with the second pressure measuring unit, and so on until the connection is made to the Nth pressure measuring unit, the other end of the last pressure measuring unit is connected with the rubber tube 5 and then connected to the transfer device 6, and the transfer device 6 is connected with the data analysis equipment. The cable formed by the lead wire 81 of the previous load cell sequentially passes through the hollow tube 2 and then passes through the hollow tube 2 of the next load cell until the end load cell and the hollow tube 2 pass out. The insertion head 7 and the hollow tube 2 are made of flexible materials, preferably polyethylene, polypropylene, polyamide, polyurethane, silica gel and the like.

As shown in fig. 5 and 6, the sensor carrier 1 is provided with a first through hole 13 along the axial direction, the rigid force-bearing member 4 is provided with a second through hole 43 along the axial direction, and the first embodiment is that the end part of the force-bearing connecting member 3 can be fixed on the inner wall of the first through hole 13 or the second through hole 43; in another embodiment, one end of the sensor carrier 1 is provided with a connecting hole 122, one end of the rigid stressed member 4 is provided with a fixing hole 44, and both the connecting hole 122 and the fixing hole 44 can be used for fixing the end of the stressed connecting member 3.

Specifically, as shown in fig. 5, the rigid force-bearing member 4 includes a limiting ring 41, and two side surfaces of the limiting ring 41 abut against an end surface of the rubber tube 5 during connection, so as to perform limiting and sealing functions. The both sides of spacing ring 41 are the go-between 42, are the second through-hole 43 in spacing ring 41 and two go-between 42, all are equipped with anti-skidding bulge loop 421 outside two go-between 42, and anti-skidding bulge loop 421 prevents the effect that drops when playing the end connection of go-between 42 and rubber tube 5, offers fixed orifices 44 on one of them go-between 42.

As shown in fig. 6 and 7, the sensor carrier 1 includes a mounting portion 11, two ends of the mounting portion 11 are connecting portions 12, the mounting portion 11 and the connecting portions 12 have first through holes 13 which are coaxial and hollow, receiving grooves 111 are provided on the mounting portion 11, the number of the receiving grooves 111 is plural, the plurality of receiving grooves 111 are uniformly distributed along the circumferential direction of the mounting portion 11, the number of sensors is increased by increasing the number of the receiving grooves 111, and 360 ° pressure detection to the axial circumferential surface can be realized. The bottom of the housing groove 111 is provided with a lead hole 112 and a vent hole 113, and the lead wire 81 of the pressure sensor 8 is inserted into the through hole through the lead hole 112. In addition, the diameter of the mounting part 11 is larger than that of the connecting part 12, the protruding structure 121 is arranged outside the connecting part 12, the mounting parts 11 at two ends can be respectively inserted into the bendable hollow pipe 2 to be connected, and then are sequentially connected in series with the mounting part 11 of the next sensor carrier 1 to form a pressure measuring conduit. The protruding structure 121 is an annular protrusion, so that friction can be increased when the hollow tube 2 is connected, connection firmness is guaranteed, and the sensor carrier 1 is prevented from being separated from the hollow tube 2.

In the above two embodiments, the force-bearing connecting piece 3 can be connected with the connecting hole 122 of the sensor carrier 1 or the fixing hole 44 of the rigid force-bearing piece 4 by winding and binding; it can also be fixed on the inner wall of the first through hole 13 of the sensor carrier 1 or the inner wall of the second through hole 43 of the rigid force-bearing member 4 by means of adhesive fixing or welding fixing.

Further, the pressure sensor 8 of the present invention is a semiconductor resistance type pressure sensor 8 made of monocrystalline silicon, and according to the piezoresistive effect of monocrystalline silicon, a strain resistance circuit on an elastic diaphragm of the pressure sensor 8 generates resistance value change by mechanical deformation, and transmits a strain signal to the outside through a corresponding circuit of the sensor. One side of the elastic diaphragm of the pressure sensor 8 is communicated with a reference pressure (in this case, atmospheric pressure) to form a reference, and the other side of the elastic diaphragm is a sensing side for sensing pressure changes. The pressure sensor 8 is mounted in the receiving groove 111 with the sensing side facing the outer circumferential surface of the sensor carrier 1 and the reference side facing the center of the circle. In this case, the bottom of the accommodating groove 111 at the position corresponding to the reference side of the pressure sensor 8 is provided with at least one vent hole 113 communicated with the atmosphere, so that the reference side is conveniently communicated with the atmosphere. The conductors 81 are typically insulated cables, each pressure sensor 8 is electrically connected directly or indirectly using other conductive material to one end of a separate set of conductors 81, and at least three conductors 81 are connected to each pressure sensor 8.

In addition, the outer side surface of the pressure sensor 8 is coated with a soft sticky block, the soft sticky block can be used as a medium for transmitting external pressure, so that the pressure transmission is more sensitive, meanwhile, the sensing side outside the pressure sensor 8 can be protected from being damaged by external force, and the connection between the pressure sensor 8 and the lead 81 can be protected from being damaged. The soft adhesive mass is preferably coated with a biocompatible medical adhesive on the surface of the pressure sensor 8.

In the above embodiment, the two ends of the stressed connecting piece 3 are respectively connected and fixed with the sensor carriers 1 of at least two pressure measuring units of the pressure measuring catheter, and the stressed connecting piece 3 is used for bearing the tensile stress in the length direction of the pressure measuring catheter, so that the pressure measuring units in the connection and fixation range cannot be expanded, extended and lengthened after being limited when being stretched by external force, and the effect of preventing the pressure measuring catheter, the wire 81 and the like from being pulled and broken is achieved, and the integrity and the connection reliability are improved. Meanwhile, one end of the stressed connecting piece 3 can be connected with the sensor carrier 1, the other end of the stressed connecting piece extends backwards to the tail end of the pressure measuring unit or a rubber tube 5 connected with the pressure measuring unit, the other end of the stressed connecting piece 3 is fixed through the rigid stressed piece 4, the overall connection reliability is further enhanced, the overall extension is prevented from being lengthened, and the integrity and the connection reliability are higher. On the other hand, by arranging the sensor carrier 1, the position of the pressure sensor 8 can be fixed, and the pressure sensor 8 and the like can be protected, so that the pressure measurement result is more accurate.

Therefore, the pressure measuring catheter of the invention has the following advantages:

1) Simple structure, measure accurate, the reliability is high: adopt resistance-type pressure sensor to measure pressure signal, compare the mode of feedback pressure such as current water fills, signal feedback is more accurate. Meanwhile, the main body of the pressure measuring conduit is a pressure sensor, so that the required matched parts are few, the structure is simple, and the reliability is high.

2) The connection is reliable: after the stress connecting piece is additionally arranged for connection among the pressure measuring units, the whole and partial extension and elongation of the guide pipe can be avoided, and the problems of loosening of the guide pipe, breakage of an internal signal cable and the like are avoided.

3) Reduce the defective rate, promote the product through rate: the problems of unreliable connection lines, disconnection and the like caused by extension of the pressure measuring guide pipe in the pulling process in the production process are avoided, the defective rate in the production process can be reduced, the first pass rate of products is improved, and the production cost is reduced.

The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.

Claims

1. A stretch-resistant pressure measurement catheter is characterized in that: the pressure measurement device comprises a stress connecting piece (3) and a plurality of pressure measurement units which are connected in sequence, wherein each pressure measurement unit comprises a sensor carrier (1) and a hollow pipe (2) which are connected; one end of the stress connecting piece (3) is connected with the sensor carrier (1), and the other end of the stress connecting piece (3) is connected with the other sensor carrier (1) or connected with the rigid stress piece (4).

2. A tear resistant pressure catheter as claimed in claim 1, wherein: the sensor carrier (1) is provided with a first through hole (13) along the axial direction, and the rigid stress piece (4) is provided with a second through hole (43) along the axial direction.

3. A tear resistant pressure catheter as claimed in claim 1, wherein: the tail ends of the connected pressure measuring units are connected with rubber tubes (5), the other ends of the rubber tubes (5) are connected with a transfer device (6), and the rigid stress pieces (4) are arranged in the transfer device (6) or the rubber tubes (5).

4. A tear resistant pressure catheter as claimed in claim 3, wherein: the head ends of the connected pressure measuring units are connected with inserting heads (7), one ends of the inserting heads (7) are sealed, and the other ends of the inserting heads are connected with connectors (71) matched with the sensor carrier (1).

5. The stretch resistant pressure sensing catheter of claim 3, wherein: one end of the sensor carrier (1) is provided with a connecting hole (122), one end of the rigid stress piece (4) is provided with a fixing hole (44), and both the connecting hole (122) and the fixing hole (44) can be used for fixing the end part of the stress connecting piece (3).

6. The stretch resistant pressure catheter of claim 5, wherein: the rigid stress piece (4) comprises a limiting ring (41), two sides of the limiting ring (41) are connecting rings (42), the second through holes (43) are formed in the limiting ring (41) and the two connecting rings (42), anti-skidding convex rings (421) are arranged outside the two connecting rings (42), and one connecting ring (42) is provided with the fixing hole (44).

7. A tear resistant pressure catheter as claimed in claim 2, wherein: the end part of the stressed connecting piece (3) can be fixed on the inner wall of the first through hole (13) or the second through hole (43).

8. A tear resistant pressure catheter as claimed in claim 1, wherein: the stress connecting piece (3) is a connecting line section made of bendable, anti-pulling and inelastic materials.

9. The stretch resistant pressure sensing catheter of claim 1, wherein: an accommodating groove (111) is formed in the outer side face of the sensor carrier (1), a lead hole (112) is formed in the bottom of the accommodating groove (111), and a pressure sensor (8) is installed in the accommodating groove (111).

10. A tear resistant pressure catheter as claimed in claim 9, wherein: the outer side surface of the pressure sensor (8) is coated with a soft sticky block.