CN102670186B - Venous pressure measuring probe as well as mounting method - Google Patents

Abstract

The invention discloses a venous blood pressure measuring probe and an installation method thereof. The venous blood pressure measuring probe comprises a flexible liner, a rigid shell and a stress conducting medium. The stress conduction medium is filled in the inner tank, and the inner tank is installed on the shell. The liner includes a bracket, an optical fiber pressure sensor, an optical fiber wire, and a cylindrical film cylinder. The membrane cylinder is sleeved on the bracket and forms a sealed cavity with the bracket. The sensor is accommodated in the sealed cavity, and the optical fiber wire extends out of the bracket through the inner bag. The advantage of the present invention is that: due to its small size, it can be used as a key component of a non-invasive venous blood pressure measurement device to adapt to the internal venous blood pressure Measuring, effective non-invasive detection device.

Description

A venous blood pressure measuring probe and its installation method

technical field

The invention relates to the field of fluid pressure detection, in particular to a venous blood pressure measuring probe suitable for medical clinical application.

Background technique

In modern medical clinic, monitoring the venous blood pressure of the human body is an important testing technique. The commonly used inspection technique is the pioneering introduction of pressure measurement. There are two main methods of this pressure measurement. One is to insert the introduction catheter of the pressure measurement device into the venous blood vessel through minimally invasive surgery. The average blood pressure is calculated by comparing the water pressure of the tube with water; another way is to directly measure the blood pressure by inserting the miniature pressure sensor that has appeared in recent years into the venous blood vessel through puncture. The common defect of the above methods is that the pressure measurement operation must destroy the venous blood vessel wall and cause trauma. Although it will not cause serious consequences under normal circumstances, it is a pioneering venous blood pressure measurement for interventions in internal organs and viscera of the human body, especially for venous blood pressure. When the blood pressure is high and varicose veins have already appeared locally, the groundbreaking measurement may cause the wound to fail to heal itself and cause massive bleeding, which is usually a taboo item in clinical application.

Contents of the invention

In view of this, it is necessary to provide a venous blood pressure measurement probe. Based on the current pressure sensor application technology environment, the non-invasive pressure measurement method can accurately collect the venous blood pressure value inside the human body. The key lies in the design of the measurement probe.

The present invention is achieved like this, a kind of venous blood pressure measurement probe, it comprises:

Flexible liner, rigid shell, stress transmission medium;

Wherein, the liner includes: a bracket, which includes a first installation end, a second installation end and a connecting rod connecting the second installation end and the second installation end, the first installation end and the second installation end are located at the On the same side of the connecting rod, the first installation end and the second installation end are both in the shape of a smooth hemispherical head, the ball top of the first installation end is provided with a conductive medium introduction hole, and the ball top of the second installation end is provided with a first optical fiber Lead-out hole; optical fiber pressure sensor, which is located between the first installation end and the second installation end; optical fiber wire, the optical fiber pressure sensor is fixed on the optical fiber wire and connected with the optical fiber wire by optical heat fusion, the optical fiber wire The top of the second installation end is extended through the first optical fiber guide hole; the cylindrical film cylinder accommodates the bracket, the two ends of the film cylinder are fixed to the first installation end and the second installation end, and the film The cylinder, the first installation end and the second installation end form a sealed cavity, the optical fiber pressure sensor is accommodated in the sealed cavity, and the conductive medium introduction hole communicates with the sealed cavity;

Wherein, the housing includes an end portion, a packing sleeve, and a receiving groove connecting the end portion and the packing sleeve and having a cylindrical opening, the end portion is in the shape of a smooth hemispherical head, and the packing sleeve is engaged with the receiving groove so as to be separable. , the top of the packaging sleeve extends vertically outwards to form a threaded connection column, and the threaded connection column is provided with a second optical fiber lead-out hole communicating with the receiving groove. In the groove, the outer surface of the liner exposed outside the receiving groove forms a flexible detection surface, the first optical fiber lead-out hole and the second optical fiber lead-out hole are located on the same straight line and communicate with each other, and the optical fiber lead also passes through the second optical fiber The lead-out hole extends out of the spherical top of the packaging sleeve;

Wherein, the stress transmission medium is filled with the sealed cavity of the liner.

As a further improvement of the above solution, the stress transmission medium is physiological saline.

As a further improvement of the above solution, the connecting rod is elongated.

As a further improvement of the above solution, both ends of the connecting rod are respectively tangent to the first installation end and the second installation end.

As a further improvement of the above solution, the housing is made of titanium alloy, aluminum alloy or titanium aluminum alloy.

As a further improvement of the above solution, glue is provided between the inner tank and the receiving tank to fix the inner tank on the receiving tank.

As a further improvement of the above solution, the thin film column is transparent.

As a further improvement of the above solution, the film column is a polyurethane layer with a thickness of 0.03mm.

The present invention also provides an installation method of the above-mentioned venous blood pressure measuring probe, the installation method includes the following steps: passing the optical fiber pressure sensor and the optical fiber wire connected thereto from the inner side of the second installation end of the liner bracket to the outside, and connecting the sensor with the The joint part of the optical fiber wire is fixed inside the first optical fiber lead-out hole, and at the same time, the gap between the optical fiber lead and the first optical fiber lead-out hole is sealed, so that the sensor is supported on the central axis of the second installation end through the connected optical fiber lead; The cylindrical film cylinder is wrapped in the liner bracket including the first installation end and the second installation end, the cylindrical film cylinder is leveled and the surface tension of the film is kept balanced; the two ports of the cylindrical film cylinder are Bonded with the first installation end and the second installation end of the bracket respectively, the tubular film cylinder is in the shape of an axially symmetrical pill after being bonded with the bracket, and a conduction medium introduction hole is left at the first installation end, and the second installation end Lead out the optical fiber wire at the end; inject the stress-conducting medium into the inner tank through the conducting medium inlet hole until it reaches the filling state, and then fill the conducting medium introducing hole to form an inner bladder with a sealed cavity, which is filled with stress conduction The cylindrical area of the medium can be used as the detection surface; Insert the liner from the rear end of the shell to install, and then install the package sleeve from the second installation end of the liner to the shell through the socket connection. The optical fiber wires led out from the second installation end are led out through the second fiber outlet hole.

The venous blood pressure measurement probe provided by the present invention is suitable for medical clinical application. When the liquid medium with the same internal stress is pressed against each other through the flexible interface after packaging, the areas in contact with each other overcome the surface tension and deform, and the deformation causes the internal stress of the medium. Pass from high to low and tend to balance. Due to the small size of the present invention, it can be used as a key component of a non-invasive venous blood pressure measurement device, which is suitable for the measurement of venous blood pressure inside the human body. Effective non-invasive detection device.

Description of drawings

Fig. 1 is a schematic perspective view of a venous blood pressure measuring probe provided in a preferred embodiment of the present invention.

Fig. 2 is a schematic diagram of the liner structure of the venous blood pressure measuring probe in Fig. 1 .

Fig. 3 is a schematic diagram of the support structure of the liner in Fig. 2 .

FIG. 4 is a schematic diagram of the shell structure of the venous blood pressure measuring probe in FIG. 1 .

Explanation of main symbols

Liner 1

Housing 2

Bracket 20

Optical fiber pressure sensor 4

Fiber Optic Cable 3

Tubular film cylinder 26

The first installation side 11

The second installation end 13

Connecting rod 12

Conductive medium inlet hole 14

The first fiber outlet hole 15

Seal chamber 10

end 31

Package Sleeve 33

Storage Tank 32

The second fiber outlet hole 35

Socket 36

Threaded connecting column 37

Detailed ways

In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and the fifth embodiment. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Please refer to FIG. 1 and FIG. 2 together, which are schematic structural diagrams of a venous blood pressure measuring probe provided in a preferred embodiment of the present invention. The venous blood pressure measurement probe includes a flexible liner 1 , a rigid shell 2 and a stress-conducting medium (not shown), wherein the stress-transmitting medium is filled in the liner 1 and the liner 1 is installed on the shell 2 . In this embodiment, the stress conduction medium is liquid physiological saline (concentration is 0.9% NaCl aqueous solution), of course, in other embodiments, it can also be other non-toxic and harmless liquid medium, such as selecting a lower viscosity coefficient And higher compression resistance methyl silicone oil (Silicone Oil), etc.

Please refer to FIG. 3 and FIG. 4 , the liner 1 includes a bracket 20 , an optical fiber pressure sensor 4 , an optical fiber wire 3 and a cylindrical film column 26 .

The bracket 20 includes a first installation end 11 , a second installation end 13 and a connecting rod 12 connecting the first installation end 11 and the second installation end 13 . In this embodiment, the connecting rod 12 is in the shape of a strip, and the two ends of the connecting rod 12 are respectively tangent to the first installation end 11 and the second installation end 13, and the first installation end 11 and the second installation end 13 are located between the connecting rod. 12 on the same side. Both the first mounting end 11 and the second mounting end 13 are in the shape of a smooth hemispherical head. The ball top of the first mounting end 11 is provided with a conduction medium introduction hole 14, and the ball top of the second mounting end 13 is provided with a first optical fiber outlet hole 15. .

The optical fiber pressure sensor 4 is located between the first installation end 11 and the second installation end 13. The optical fiber pressure sensor 4 is fixed on the optical fiber wire 3 and is electrically connected with the optical fiber wire 3, which mainly refers to an optical hot-melt connection. The optical fiber wire 3 passes through The first fiber leading hole 15 extends out of the top of the second installation end 13 .

The cylindrical film cylinder 26 accommodates the bracket 20, and the two ends of the film cylinder 26 are fixed to the first mounting end 11 and the second mounting end 13, and the film cylinder 26, the first mounting end 11 and the second mounting end 13 form a seal cavity 10 , the optical fiber pressure sensor 4 is accommodated in the sealed cavity 10 , and the conduction medium introduction hole 14 communicates with the sealed cavity 10 . Preferably, the film cylinder 26 is a polyurethane layer with a thickness of 0.03 mm, which is transparent.

The casing 2 is made of titanium alloy, aluminum alloy or titanium-aluminum alloy. The casing 2 includes an end portion 31 , an encapsulation sleeve 33 and a receiving groove 32 connecting the end portion 31 and the encapsulation sleeve 33 with a cylindrical opening. The end portion 31 is in the shape of a smooth hemispherical head. The package sleeve 33 is engaged with the receiving groove 32 so as to be detachable. There are many ways of engaging. In this embodiment, the conventional insertion groove 36 is adopted. The top of the package sleeve 33 extends vertically outwards to form a threaded connection post 37 . The threaded connection post 37 defines a second optical fiber leading hole 35 communicating with the receiving groove 32 . The cross section of the receiving groove 32 is arc-shaped.

When the venous blood pressure measurement probe is installed, it can be packaged under normal conditions (i.e. normal pressure and normal temperature environment 101325Pa20℃), and the installation steps are as follows:

Pass the optical fiber pressure sensor 4 and the connected optical fiber wire 3 outward from the inner side of the second installation end 13 of the inner tank bracket 20, and fix the joint between the sensor 4 and the optical fiber wire 3 in the first optical fiber outlet hole 15 The inner side (in this embodiment, adopt hot-melt material to fix such as: high-density polyethylene), seal the gap between the optical fiber lead 3 and the first optical fiber lead-out hole 15 at the same time, make the sensor 4 be supported by the optical fiber lead 3 connected thereto placed on the central axis of the second mounting end 13;

Wrap the cylindrical film cylinder 26 in the inner tank bracket 20 including the first mounting end 11 and the second mounting end 13, level the cylindrical film cylinder 26 and keep the surface tension balance of the film;

The two ports of the tubular film cylinder 26 are bonded to the first installation end 11 and the second installation end 13 of the inner bag support 20 respectively (in this embodiment, the adhesive medium adopts chemical materials such as: α-cyano group ethyl acrylate), the tubular film cylinder 26 is bonded with the inner container bracket 20 to form an axially symmetrical pill shape, the first installation end 11 has a conduction medium introduction hole 14, and the second installation end 13 places the optical fiber wire 3;

The stress conduction medium is injected into the inner container through the conduction medium introduction hole until it reaches a filling state, and then the conduction medium introduction hole 14 is filled (in this embodiment, a hot-melt material such as high-density polyethylene is used to fill the conduction medium introduction hole 14) to form a liner 1 with a sealed cavity 10, the sealed cavity 10 of the liner 1 is filled with the cylindrical area of the stress-conducting medium and can be used as a detection surface (a rectangular curved surface in this embodiment);

Insert and install the liner 1 from the rear end of the shell to a suitable position, and then connect and install the packaging sleeve from the second installation end of the liner to the shell 2 through the socket (not shown in the figure), the second end of the liner The optical fiber wire 3 led out from the installation end 13 is led out through the second fiber lead out hole 15 .

At this point, the venous blood pressure measuring probe is installed. In this embodiment, in order to better stabilize the inner tank 1 and the storage tank 32, glue is provided between the inner tank 1 and the storage tank 32. Of course, in other embodiments, the glue Also can not adopt, through the flexibility of liner 1 itself and the rigidity of holding tank 32 itself, at the same time by means of the cooperation between the end, the packaging sleeve, and the holding slot 32, the inner liner 1 and the holding slot 32 It can be well stabilized and will not affect the normal use of the venous blood pressure measuring probe.

When the venous blood pressure measurement probe is in use, the flexible detection surface of the measurement probe is pressed against the surface of the venous blood vessel to be measured in a columnar parallel manner, and an external force perpendicular to the detection surface is applied, that is, an external force is measured, so that the Concave-convex deformation occurs on the thin film of the flexible detection surface;

When the venous blood pressure is higher than normal pressure, the membrane undergoes concave deformation;

The space volume where the measuring probe is deformed has a linear relationship with the blood pressure inside the blood vessel, namely the venous pressure, the surface tension of the blood vessel and the measuring external force applied by the operation. When reaching the surface of the blood vessel, the resultant force value measured and read remains relatively stable, and the resultant force value of the above-mentioned three kinds of force is output to the data analysis device (in this embodiment, refers to a special digital instrument based on microprocessor control in the industry). Terminal equipment), in the data analysis device, the internal pressure value of the blood vessel, that is, the venous blood pressure value, is calculated and obtained by running the algorithm program designed by the empirical model.

The venous blood pressure measurement probe is suitable for medical clinical applications. When the liquid medium with the same internal stress is pressed against each other through the flexible interface after respective packaging, the areas in contact with each other overcome the surface tension and deform, and the deformation causes the internal stress of the medium to change from high to high. Low pass and tend towards balance. Due to the small size of the present invention, it can be used as a key component of a non-invasive venous blood pressure measurement device, which is suitable for the measurement of venous blood pressure inside the human body. Effective non-invasive detection device.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (9)

1. A venous blood pressure measuring probe, characterized in that it comprises: Flexible liner, rigid shell, stress transmission medium; Wherein, the liner includes: a bracket, which includes a first installation end, a second installation end and a connecting rod connecting the first installation end and the second installation end, and the first installation end and the second installation end are located at the connecting rod. On the same side of the rod, the first installation end and the second installation end are both in the shape of a smooth hemispherical head. The ball top of the first installation end is provided with a conductive medium introduction hole, and the ball top of the second installation end is provided with a first optical fiber outlet. Hole; optical fiber pressure sensor, which is located between the first installation end and the second installation end; optical fiber wire, the optical fiber pressure sensor is fixed on the optical fiber wire and is connected with the optical fiber wire by optical heat fusion, and the optical fiber wire passes through The first optical fiber lead-out hole extends out of the top of the second installation end; the cylindrical film column accommodates the bracket, and the two ends of the film column are fixed to the first installation end and the second installation end, and the film column The body, the first installation end and the second installation end form a sealed cavity, the optical fiber pressure sensor is accommodated in the sealed cavity, and the conductive medium introduction hole communicates with the sealed cavity; Wherein, the housing includes an end portion, a packing sleeve, and a receiving groove connecting the end portion and the packing sleeve and having a cylindrical opening, the end portion is in the shape of a smooth hemispherical head, and the packing sleeve is engaged with the receiving groove so as to be separable. , the top of the packaging sleeve extends vertically outwards to form a threaded connection column, and the threaded connection column is provided with a second optical fiber lead-out hole communicating with the receiving groove. In the groove, the outer surface of the liner exposed outside the receiving groove forms a flexible detection surface, the first optical fiber lead-out hole and the second optical fiber lead-out hole are located on the same straight line and communicate with each other, and the optical fiber lead also passes through the second optical fiber The outlet hole extends out of the ball top of the package; Wherein, the stress transmission medium is filled with the sealed cavity of the liner. the 2. A venous blood pressure measuring probe according to claim 1, characterized in that the stress transmission medium is physiological saline. the 3. A venous blood pressure measuring probe according to claim 1, wherein the connecting rod is in the shape of a strip. the 4. A venous blood pressure measuring probe according to claim 1 or 3, characterized in that, the two ends of the connecting rod are respectively tangent to the first installation end and the second installation end. the 5. A venous blood pressure measuring probe according to claim 1, wherein the housing is made of titanium alloy, aluminum alloy or titanium aluminum alloy. the 6 . The venous blood pressure measuring probe according to claim 1 , wherein an adhesive is provided between the inner liner and the receiving tank to fix the inner liner on the receiving tank. 7 . the 7. A venous blood pressure measuring probe according to claim 1, characterized in that, the thin film cylinder is transparent. the 8. A venous blood pressure measuring probe according to claim 1 or 7, characterized in that, the film column is a polyurethane layer with a thickness of 0.03 mm. the 9. A method for installing a venous blood pressure measuring probe, which is applied to the venous blood pressure measuring probe according to any one of claims 1 to 8, characterized in that the installing method comprises the following steps: installing the optical fiber pressure sensor and its The connected optical fiber wires pass outward from the inner side of the second installation end of the liner bracket, and fix the joint between the sensor and the optical fiber wires on the inside of the first optical fiber outlet hole, and at the same time seal the gap between the optical fiber wire and the first optical fiber outlet hole The gap, so that the sensor is supported on the central axis of the second installation end through its connected optical fiber wire; the cylindrical film cylinder is wrapped in the inner bag bracket including the first installation end and the second installation end, Level the cylindrical film cylinder and keep the surface tension balance of the film; glue the two ports of the cylindrical film cylinder to the first mounting end and the second mounting end of the bracket respectively, after the cylindrical film cylinder is bonded to the bracket It is in the shape of an axially symmetrical pill, with a conduction medium introduction hole at the first installation end, and an optical fiber wire is drawn out at the second installation end; the stress conduction medium is injected into the inner tank through the conduction medium introduction hole until it reaches the filling state, and then Fill the conduction medium introduction hole to form a liner with a sealed cavity, and the cylinder area filled with the stress conduction medium can be used as the detection surface; the liner is inserted and installed from the rear end of the shell, and then The packaging sleeve is connected and installed on the casing from the second installation end of the inner tank through the socket, and the optical fiber wires drawn out from the second installation end of the inner tank are led out through the second optical fiber outlet hole. the