JPS6311018B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a delivery suction extractor used in a fetal suction delivery method.

A suction extractor for childbirth (suction delivery device) uses a suction device to generate negative pressure, uses this negative pressure to attach a cup to the advanced part of the fetus during delivery, and guides the baby through this cup. It is used for pulling out.

This suction delivery method is easier to perform than the other method, the forceps delivery method, and has advantages such as less damage to the birth canal and easier rotation of the baby.
There are also some drawbacks:

In other words, in normal cephalic delivery, the suction cup of the suction extractor for childbirth is attached to the baby, and only the pressure of the suction pump connected to it is adjusted, and after setting the appropriate pressure, the suction cup is pulled. A suction delivery was performed.

However, in this case, even if the negative pressure is the same, the traction force of the suction cup differs depending on the size of the cup (there are multiple shapes), and it is up to the surgeon to know the level of traction strength. At present, we have no choice but to rely on our intuition.

This can be explained using a conventional extractor shown in Fig. 1. In the figure, 1 is a suction device equipped with a negative pressure gauge 1A, and a suction cup 3 and hoses 4A, 4B with a cross puller 2 sandwiched between them. Further, the cross puller 2 and the suction cup 3 are connected by a chain 5 inserted into the hose 4A.

In addition, 2A in the figure is a negative pressure regulating valve.

In this extraction device, the suction device 1 acts on the fetal head M disposed on the front side of the suction cup 3 via hoses 4A and 4B at a set pressure while displaying the operating pressure on the negative pressure gauge 1A. , the suction cup 3 is suctioned and fixed to the fetal head M.

The suction force of the suction cup 3 on the fetal head M at this time is determined by the magnitude of the negative pressure generated by the suction device 1 and displayed on the negative pressure gauge 14 and the action area (effective suction area) of the suction cup 3. The operator confirms that the fetal head M is sufficiently suctioned and fixed by the suction cup 3, confirms that the negative pressure is at an appropriate value, and pulls the cross puller 2 in accordance with the labor pains of the delivery person. .

At this time, the traction force applied to the cross puller 2 is transmitted to the suction cup 3 via the chain 5 and acts on the fetal head M.

While repeating this traction and helping the baby turn, the operator can perform an emergency delivery.

The first point that is difficult for the operator to use when using this retractor and that must be taken care of is that when pulling the cross puller 2, excessive force is applied and the suction cup 3 slips off the fetal head M. The goal is to make sure that you don't let it happen.

However, with this retractor, it is not possible to objectively and accurately know how much traction force is being applied by the operator.

Therefore, even though the surgeon believes that the suction cup has a safe traction force that will prevent it from slipping off the baby's head, in reality, the suction cup's suction power is often exceeded and the traction force may exceed the suction power of the cup, and in this case, the cup may slip off the baby's head. become.

This slippage of the cup must be avoided as much as possible as it has a negative impact on the baby, but repeating this should be avoided at all costs as it can cause hematoma at the site of slippage.

Furthermore, the second point that the operator must be very careful when using this retractor is that the suction cup applies strong negative pressure to the baby's head during delivery, which is equivalent to the traction force. It is best to avoid applying it across the board as much as possible.

However, with this extractor, although it is possible to lower the negative pressure of the suction cup by adjusting the negative pressure regulating valve during the pause period of a labor attack, it is not possible to objectively and accurately know when the next contraction attack will occur.

Therefore, the surgeon has no choice but to wait while applying strong negative pressure so that traction can be performed immediately when the next contraction occurs, and if this condition is not maintained, negative pressure will be applied during traction. The descent causes the suction cup to slip off the fetal head.

Applying strong negative pressure from this cup over the course of childbirth can cause birth lumps (lumps that form under the skin due to body fluids and fat in the tissues) at the suction site.
It must be avoided at all costs as it has a negative impact on the child.

The object of the present invention is to provide a suction extractor for childbirth that completely eliminates the above-mentioned conventional drawbacks.

The present invention will be explained in detail below with reference to embodiments shown in the drawings.

In Fig. 2, 1 is a suction device equipped with a negative pressure gauge 1A, 2 is a cross pull, 3 is a suction cup, 4A,
Reference numeral 4B denotes a hose, and the total length of the hose 4A connecting the suction cup 3 and the cross puller 2 is slightly longer than the length of the chain 5 that is inserted inside the hose and connecting the cross puller 2 and the suction cup 3. long formed.

A strain gauge 6 (traction force sensor) is attached to a rope connecting the cross puller 2 and the chain 5, and is connected to a traction force detection device 7.

Thus, the force applied to the cross puller 2 passes through the strain gauge 6 and the chain 5, is transmitted to the suction cup 3, and acts on the fetal head M.

The force is electrically detected by the strain gauge 6, and the magnitude can be displayed by the traction force detection device 7 as required.

Here, the adsorption force can be considered as the product of the adsorption area of the adsorption cup and the negative pressure, but the actual effective adsorption area depends on the size, shape, material, etc. of the adsorption cup. In many cases, it does not match the adsorption area.

Therefore, when considering the suction force, it is convenient to consider the relationship between the actual negative pressure and the suction force, or in other words, the effective suction area determined from the dimensions, shape, material, etc. of the suction cup.In this case, the suction force is It is expressed as the product of effective adsorption area and negative pressure.

There is also the problem of how large the traction force is appropriate for a certain value of the adsorption force.

Again, the size, shape, and material of the suction cup are relevant, but a reasonable traction force is determined primarily by negative pressure when the suction force or cup is constant.

There is no set method for determining this, but considering fluctuations in traction force, rate of increase, rate of increase in negative pressure, etc., the traction force must be within a range that does not cause slippage, and the negative pressure at the time The traction force within an appropriately determined range is defined as the appropriate traction force.

Because of the above, the display of the above-mentioned traction force detection device 7 may display not the magnitude of the traction force but also the negative pressure that generates a suction force equivalent to the traction force.

However, in the present invention, this display function is not necessarily required.

In FIG. 3, instead of the strain gauge 6 in FIG. 2, a spring 8, a light emitting element 9, and an optical sensor 10 are provided at positions facing the light emitting element 9, respectively.

The spring 8, the light emitting element 9, and the optical sensor 10 function in the same manner as the strain gauge 6 described above.

In other words, the force applied to the cross pull 2 stretches the spring 8 and the optical sensor 1 fixed to the cross pull 2
0 and the light emitting element 9 connected to the cross pull handle 2 via the spring 8, and the force is electrically detected.

FIG. 4 shows the configuration of an embodiment of the present invention.

The suction operation, suction operation, traction operation, method of detecting traction force, etc. are the same as described above.

Chain 5 and cross puller 2 connected to suction cup 3
A strain gauge (traction force sensor) 6 disposed between the cross puller 2 electrically detects the traction force applied to the cross pull handle 2 and sends it to the traction force detection device 7, and the traction force detection device 7 displays the traction force by an appropriate means. At the same time, a traction force signal is sent to the suction device control circuit device 11,
This suction device control circuit device 11 drives the suction device 1 so as to automatically control the negative pressure of the suction device 1 according to the signal of the traction force.

The mode of automatic control is, for example, when the traction force is zero or below a certain value, the suction cup is maintained at a weak negative pressure that barely sticks, and when the above-mentioned certain value is exceeded, the negative pressure is changed to the predetermined negative pressure for suction delivery. Furthermore, if a traction force exceeding a certain traction force value is detected, the final negative pressure is applied to prevent slippage.

Therefore, the negative pressure created by the suction device 1 is automatically controlled to be a sufficient negative pressure so that the currently acting traction force falls within the appropriate traction force range.

As a result, when the traction force increases and changes over time, it is possible to compensate to some extent for the time lag in the negative pressure generated in the control system.

In addition, even if the traction force becomes zero, the suction cup 3
can be kept in a fixed state.

Therefore, traction can be easily repeated in synchronization with the intermittent contractions of the laboring patient, and the blood pressure is automatically lowered so as not to apply unnecessary strong negative pressure to the fetal head M during the period when the contractions are not in contractions. be able to.

In this way, since traction and pauses occur between contractions, the negative pressure on the fetal head is automatically controlled to a weak level, producing a birth control effect, and when traction is started during contractions, the negative pressure on the fetal head is automatically controlled to a weak level. It can generate strong negative pressure and prevent slipping.

Another embodiment of the invention is shown in FIG.

In this embodiment, a branch path 4C is provided in the hose 4B connecting the suction device 1 and the cross puller 2, and a negative pressure detection circuit device 12 is installed in the branch path, and the traction force detection device 7 is connected to the negative pressure detection circuit device 12 via an alarm circuit device 13. It is connected with.

In the illustrated embodiment, the negative pressure detection circuit device 12 is installed in a branch line, but it may be installed anywhere in this connected vacuum system including the suction device 1 and the suction cup 3. From the purpose of detecting the suction force, it is desirable to provide the suction cup or its vicinity.

Here, the negative pressure detection circuit device 12 detects the working negative pressure, and sends a signal of this negative pressure to the alarm circuit device 13.

The alarm circuit device 13 calculates and compares the traction force signal detected by the strain gauge 6 and sent via the traction force detection device 7 and the negative pressure signal sent from the negative pressure detection circuit device 12, and uses the calculation comparison circuit to:
It is determined whether the traction force exceeds the appropriate traction force determined according to the applied negative pressure.

At this time, the suction force changes depending on the negative pressure, but as mentioned above, when the suction cup changes, the effective suction area changes, and the suction force changes.

Therefore, the appropriate traction force also differs, so when performing this calculation comparison for suction drawers that use multiple types of suction cups, the process of performing calculation comparisons depends on which suction cup is being used. An effective adsorption area setting device is required to determine the adsorption cup factor.

The process of arithmetic comparison can be easily carried out using a known electric circuit, and various known combination processes can be used for the arrangement, etc., so a description of the circuit configuration will be omitted.

Further, the negative pressure detection circuit device 12 is used to detect negative pressure, but a mechanism that operates by negative pressure is used.
Other means can be considered, such as mechanically changing the degree of amplification of the traction force signal, or converting it into an optical quantity such as the amount of light and processing it, but the negative pressure detection circuit device 12 referred to here does not include these methods. It shall also include all negative pressure detection means for issuing a warning based on the relationship between the traction force signal and negative pressure.

In any case, a determination is made by comparing the appropriate traction force determined from the negative pressure and the effective adsorption area setting device used as necessary from the process described above with the traction force obtained through the traction force detection device.

If the traction force is about to exceed or exceeds this proper traction force, a warning is issued by sound or light. Other effects and operations are the same as described above.

By providing this warning device, the operator does not have to worry about injury due to applying excessive traction force during traction, and can prevent the occurrence of slippage.

FIG. 6 shows yet another embodiment of the invention, which is a combination of the embodiments shown in FIGS. 4 and 5.

That is, the applied negative pressure signal from the negative pressure detection circuit device 12 and the traction force signal from the traction force detection device 7 are sent to the alarm circuit device 13, and if the traction force is about to exceed or exceeds the appropriate traction force determined according to the applied negative pressure. If a warning occurs, an alarm will be issued by sound or light.

On the other hand, the traction signal from the traction force detection device 7 is output from the suction device control circuit device and acts on the suction device 1 to automatically control the negative pressure according to the traction force.

The functions and operations of each part are the same as described above.

With this device, the operator can only be careful not to issue an alarm and concentrate on traction in response to the labor pains of the laboring patient, making it easier to concentrate on other treatments, etc. Emergency delivery can be performed safely.

Since the present invention has the above configuration, in the first invention, the magnitude of negative pressure is automatically controlled according to the magnitude of the traction force, so that the traction force applied to the suction cup is equal to the suction force of the suction cup. It cannot be more than that.

Therefore, the suction cup will not slip off from the baby's head, preventing accidents such as hematoma from occurring at the site of slippage, and also reduce negative pressure by stopping traction during the pause period of labor. Since the pressure is automatically lowered, it is possible to prevent a situation where a lump occurs at the suction site.

In addition, in the second invention, if an attempt is made to apply excessive traction force that exceeds the appropriate traction force determined according to the applied negative pressure, an alarm is generated to warn the operator of the possibility of slippage. It has various effects such as being able to completely prevent this, eliminate the operator's anxiety about slipping, and enable sufficient traction.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a conventional suction extractor for childbirth, and FIGS. 2 to 6 are explanatory diagrams each showing an embodiment of the suction extractor for childbirth according to the present invention. 1... Suction device, 1A... Negative pressure gauge, 2... Cross pull, 3... Suction cup, 4A, 4B, 4C...
... Hose, 5 ... Chain, 6 ... Strain gauge (traction force sensor), 7 ... Traction force detection device,
8... Spring, 9... Light emitting element, 10... Optical sensor, 11... Suction device control circuit device, 12... Negative pressure detection circuit device, 13... Alarm circuit device.

Claims (1)

[Scope of Claims] 1. The suction cup and the suction device are connected through a pipe via a handle, and the suction cup and the handle are connected by a string, and the traction force applied to the string is detected by a traction force detection device, A suction extractor for childbirth, characterized in that the traction force signal is sent to a suction device control circuit device, and the negative pressure of the suction device is automatically controlled by the device in accordance with the traction force signal. 2. The suction cup and the suction device are connected through a pipe via a handle, and the suction cup and the handle are connected by a string, and the traction force applied to the string is detected by a traction force detection device, and the traction force acting on the suction cup is detected by a traction force detection device. The negative pressure detected by the negative pressure detection circuit device is sent to an arithmetic comparison circuit, and the traction force signal from the traction force detection device and the negative pressure signal from the negative pressure detection circuit device are sent to the arithmetic comparison circuit. A suction extractor for childbirth, characterized in that it determines whether or not the appropriate traction force determined according to the negative pressure is exceeded, and generates an alarm if the traction force is exceeded. 3. The suction extractor for childbirth according to claim 2, further comprising means for comparing the traction force with an appropriate traction force determined by the negative pressure and the size, shape, material, etc. of the suction cup used. 4. The suction extractor for childbirth according to claim 3, further comprising an effective suction area setting device according to the effective suction area of the suction cup.