JPS6351021B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a brain pressure measurement sensor for measuring and recording brain pressure, that is, the pressure of the brain and cerebrospinal fluid within the dura mater, outside the body after head surgery. be.

By accurately measuring a patient's brain pressure continuously or discontinuously as needed after head surgery, useful knowledge can be obtained for treatment. Various attempts have been made to accurately measure brain pressure by inserting it into the brain and guiding it outside the body.

For example, Japanese Patent Application Laid-Open No. 5886/1986 discloses a method of measuring brain pressure by inserting a balloon made of silicone rubber and filled with liquid into the skull; No. 121591 describes a method for measuring cerebral pressure inside the skull using a non-stretchable sensing bag filled with liquid.

In these methods, if the amount of fluid in the balloon or detection bag is insufficient, a pressure lower than the brain pressure is observed, and if the amount of fluid is excessive, a pressure higher than the brain pressure is measured, so the fluid volume is Therefore, in the former case, the volume of the hollow part of the balloon should be set to less than half of the internal volume of the communicating tube connected to it, and in the latter case, the volume of the liquid to be injected into the detection bag should be set to an appropriate value. The amount is set at 14-16% of its total volume.

On the other hand, according to Yoriaki Kumagai et al.'s ``Brain pressure monitoring device that can always be kept for emergency trauma'' described in ``Neurotrauma'' Vol. In addition, the pressure gauge connected to the pressure gauge for measuring brain pressure must be selected so that the volume change due to the application of pressure is sufficiently smaller than 1% of the internal volume of the bag.

From the above, balloons, pressure sensing bags, and other bag-shaped sensing ends for intracerebral pressure measurement (hereinafter simply referred to as "sensing ends")
means. ) and communication pipes, introduction pipes, and other pressure piping connected thereto (hereinafter simply referred to as "piping", and the combination of the detection end, piping, and their attachments is referred to as "brain pressure measurement sensor"). It can be seen that the liquid injected or to be injected must be free of air bubbles, even in small amounts, and that the amount of injected liquid needs to be precisely controlled.

However, as soon as it is actually carried out, it becomes clear that it is extremely difficult to completely displace and exhaust the air already present in the piping and the detection end while introducing liquid through a single thin pipe. Nevertheless, there is no literature that calls attention to this point, and even less that there is no literature that proposes a solution.

Of course, it would be possible to use a special device to introduce a certain amount of fluid into the brain pressure sensor without creating bubbles, but in this case,
It was difficult to ensure the sterilization required when implanting the sensor into the body, making it impossible to put it into practical use.

The present invention aims to provide a brain pressure measurement sensor and a method for regulating the amount of injected fluid that solve the above-mentioned problems, and will be described below with reference to the drawings.

FIG. 1 is a conceptual diagram of a brain pressure measurement sensor using a conventional method, in which 1 is the scalp, 2 is the cranium, 3 is the hole, 4 is the detection end, 5 is the piping, 6 is the dura mater, and 7 is the fluid supply. 8 is a valve, and 9 is a pressure gauge.

Parts 1 and 2 were partially removed during surgery and put back into their original state.

As mentioned above, with such a sensor, it is difficult to accurately inject a predetermined amount of liquid without entraining bubbles.

Figure 2 and subsequent figures relate to the brain pressure measurement sensor and the method for regulating the volume of injected fluid according to the present invention, of which Figure 2 is a structural diagram of the sensor, and A in the figure
B is the detection end, which is bag-shaped with a length of about 25 mm and a width of about 15 mm, and B is an inflow nozzle, with an inner diameter of about 0.5 mm and an outer diameter of about
0.9 mm, and the length is approximately 2 to 3 mm. C is a multi-hole tube, consisting of two holes with an inner diameter of about 0.8 mm and an outer diameter of about 2 mm. This double hole tube is a single hole tube 2.
It may also be a combination of books. D is an inlet single hole tube with an inner diameter of about 0.8 mm and an outer diameter of about 1.8 mm, E is an outlet single hole tube with an inner diameter of 0.8 mm and an outer diameter of about 1.8 mm, F is a three-way stopcock, G is a two-way stopcock, and H is a fixed wing. , I is the mark (insert length mark), J is the binding ring from A to F
The length is about several hundred mm. Note that the dimensions of each part are exemplary, and of course the dimensions are not limited to these.

The purpose of the inflow nozzle B is to prevent the droplet bypass phenomenon from the liquid inflow side opening to the liquid outflow side opening of the multi-hole tube connected to the detection end. In order to achieve this, it is necessary that the distance between the two openings be approximately 2 mm or more.

On the other hand, if this distance is secured, it is not necessarily necessary to take the form of an inflow nozzle, and therefore, instead of an inflow nozzle, it is possible to simply use a multi-hole tube with both openings separated, or the end of the outflow port. A multi-hole tube, etc., which is closed and has an opening on the side, may also be used.

The material used for this sensor is glass, polycarbonate, or a similar material for the F three-way stopcock and the G two-way stopcock, and materials for other parts must be flexible and have sufficient rigidity. For example, synthetic resins such as polyethylene, polypropylene, and polyvinyl chloride are particularly suitable, but materials other than these synthetic resins can also be used as long as they satisfy the above requirements.

Next, Figure 3 is a drawing of the removable injection liquid volume regulating case, where K is the top plate, which is about 60 mm long and about 30 mm wide.
mm, and the height is approximately 5 mm. L is the bottom plate and has the same dimensions as the top plate except that it is symmetrical in shape. Further, M is a mating portion and N is a detachable fastener, which has an integral structure that can be opened and closed as a whole.

The material used for this case is preferably a synthetic resin as exemplified in the explanation of FIG. 2, but other materials can also be used as long as they have sufficient rigidity.

In addition, the dimensions of each part above are also exemplary, and
Although it is not necessarily limited to these, the second
There must be an appropriate dimensional relationship with the detection end in Figure A. The entire case is represented by P.

Now, the method of injecting fluid into the above-mentioned cerebral pressure measurement sensor will be explained according to the method of injecting fluid into FIG. 4. In the figure, P is the injection liquid volume regulating case, Q is the syringe, R is the blind plug, and the rest is the same as in Figure 2, A is the detection end, B is the inflow nozzle, C is the multi-hole tube, and D is the inflow single hole. Tube, E is an outflow single hole tube, F is a three-way stopcock, G is a two-way stopcock, H is a fixed wing I is a mark, and J is a binding ring.

To inject the liquid, first place the injection liquid volume regulating case P downward, connect the syringe Q containing the liquid to the bottom of the three-way stopcock, open the two-way stopcock G, and connect the three-way stopcock F with the syringe Q. Turn the tube so that it communicates with the inflow single-hole tube D, and pass the liquid into the syringe through the inflow single-hole tube - one hole of the double-hole tube - the detection end - the other hole of the double-hole tube - the outflow single-hole tube - the two-way stopcock. By flowing, the entire detection end can be easily filled with an appropriate amount of liquid without creating bubbles.

Next, turn the three-way stopcock and two-way stopcock to seal in the liquid inside the detection tip and piping, and remove the injection liquid volume control case and syringe, making it possible to insert the detection tip into the skull. . After insertion, remove the blank plug, connect the pressure transducer through the diaphragm dome for sterilization reasons, fill the space between the pressure transducer and the three-way stopcock with liquid, and after the pressure transducer reaches zero adjustment, the inflow single Brain pressure measurement can be started by turning the three-way stopcock so that the pressure in the hole tube is transmitted to the pressure transducer.

By adopting such a device structure and operating method, it has become possible to rapidly inject an appropriate amount of liquid without bubbles, which was completely impossible with conventional device structures. If there is no double-hole tube, it is difficult to replace gas and liquid in the piping, and if the two end openings of the double-hole tube connected to the detection end are not separated using an inflow nozzle, etc., the inside of the detection end Gas-liquid replacement becomes difficult. Note that the injection liquid amount regulating case shown in FIG. 3 is not necessary for preventing the generation of bubbles, but is used to facilitate control of the injection liquid amount.

In this way, the present invention makes it possible to quickly and easily inject fluid without bubbles into the cerebral pressure measurement sensor by employing a multi-hole tube and a separation of the openings, which were completely unthinkable in the past. Furthermore, by using an injection liquid volume control case, it is possible to appropriately control the injection liquid volume at the same time. This made it possible to put measurement sensors into practical use.

[Brief explanation of the drawing]

Fig. 1 is a conceptual diagram of a sensor for measuring brain pressure according to the conventional method. Membrane, 7...liquid supply source, 8...valve, 9...pressure gauge. FIG. 2 is a structural diagram of the brain pressure measurement sensor according to the present invention, in which A...detection end, B...inflow nozzle, C...multiple hole tube, D...inflow single hole tube, E...outflow single hole Hole tube, F... three-way stopcock, G... two-way stopcock, H... fixed wing, I... mark, J... binding ring. FIG. 3 is a drawing of a removable injection liquid volume regulating case, in which K...top plate, L...bottom plate, M...mating portion, N...detachable fastener. Fig. 4 is a diagram showing the liquid injection method, and includes A...detection end, B...inflow nozzle, C...multi-hole tube, D...inflow single-hole tube, E...outflow single-hole tube, F... ...Three-way stopcock, G...Two-way stopcock, H...Fixed wing, I...Mark, J...Binding ring, P...Injection liquid volume control case, Q...Syringe, R...Mekura plug.

Claims (1)

[Claims] 1. In a sensor part of a brain pressure measuring device consisting of a detection end and piping, the piping is separated into two tubes, a liquid inflow tube and a liquid outflow tube, and both tubes are connected to the detection end. A brain pressure measurement sensor characterized by having a certain distance between terminal openings of the brain. 2. When filling a certain amount of liquid into the brain pressure measurement sensor consisting of a detection end and piping, the detection end is placed in a liquid injection volume regulating case with a constant internal volume, the liquid is injected from the liquid inflow pipe, and the liquid is injected from the liquid outflow pipe. A method for regulating the amount of injected liquid, which is characterized in that a fixed amount of liquid is sealed in the liquid after it flows out.