JP2018061738A - Surgical needle detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surgical needle detecting device capable of collecting a surgical needle placed in a body. SOLUTION: A surgical needle detection device 100 includes a main body case 101 and a detection rod body 110. The main body case 101 includes a connection portion 102, a power switch 103, and a control board 120 in the main body portion 101a, and also includes a battery case 104 and an operator 106 in the grip portion 101b. The detection rod 110 includes a first magnetic sensor 113 and a second magnetic sensor 115 in a casing 111 extending in a rod shape. The casing 111 is composed of a cylindrical body portion 111a and a cutting-edge portion 111b that closes one end of the cylinder body 111a. The casing 111 is formed so that the wall thickness of the cutting edge portion 111b is thinner than the wall thickness of the cylinder body portion 111a. Further, the magnetic field generator 113c constituting the first magnetic sensor 113 has a magnetic force capable of magnetically attracting the surgical needle M to the surface of the cutting edge portion 111b. [Selection diagram]

Description

  The present invention relates to a surgical needle detection device that searches for a surgical needle placed in the body.

  2. Description of the Related Art Conventionally, there has been a surgical needle collection device that can collect surgical needles such as magnetic suture needles and anastomosis needles lost during surgery. For example, Patent Literature 1 below discloses a needle-like magnetic metal recovery device that recovers a surgical needle dropped on a floor during surgery.

JP 2013-230456 A

  However, in the above-described needle-like magnetic metal recovery device, since the surgical needle that has fallen on the floor surface is the target of recovery, there is a problem that the surgical needle placed in the patient's body cannot be recovered. In particular, a so-called microneedle having a wire diameter of 100 μm or less is difficult to collect the microneedle itself in the body, but it is extremely difficult to collect a fragment such as a needle tip in which the microneedle is damaged.

  The present invention has been made to cope with the above problems, and an object of the present invention is to provide a surgical needle detection device capable of collecting a surgical needle placed in the body.

  In order to achieve the above object, a feature of the present invention is a surgical needle detection device for detecting a surgical needle made of a magnetic material placed in the body, which is formed in a hollow rod shape and inserted into the body. And a magnetic body detection means that outputs a detection signal according to the presence or absence of a magnetic body around the detection rod body in the body by using a magnetic field generated by a magnetic field generator that is provided at a tip portion in the detection rod body and generates a magnetic field. A magnetic body determining means for determining the presence or absence of a magnetic body around the detection rod based on the detection signal, and the magnetic field generator can magnetically attract the surgical needle to the surface of the tip of the detection rod It has a magnetic force.

  According to the feature of the present invention configured as described above, the surgical needle detection device has a magnetic field generator having a magnetic force capable of magnetically attracting the surgical needle to the distal end portion of the detection rod inserted into the body. Therefore, by inserting the distal end portion of the detection rod body into the body, the surgical needle placed in the body can be attracted to the distal end portion of the detection rod body and collected. In addition, since the surgical needle detection device according to the present invention includes the magnetic body detection means and the magnetic body determination means, it is possible to detect the presence / absence of a magnetic body around the detection rod body, and the presence and recovery of the surgical needle. Can be detected.

  Another feature of the present invention is that in the surgical needle detection device, the magnetic field generator is a permanent magnet.

  According to another feature of the present invention configured as described above, the surgical needle detection device can be configured to be smaller than the case where the magnetic field generator is configured by a coil because the magnetic field generator is configured by a permanent magnet. At the same time, the surgical needle can be collected without a power source.

  Another feature of the present invention is that, in the surgical needle detection device, the detection bar is formed such that the tip portion is thinner than the tip portion.

  According to another feature of the present invention configured as described above, the surgical needle detection device is configured such that the distal end portion of the detection rod body is a portion other than the distal end portion, that is, the end portion side opposite to the distal end portion. Therefore, even if the magnetic field generator is reduced in size, it is possible to secure the magnetic force necessary for collecting the surgical needle and to ensure the rigidity of the detection rod body formed in a cylindrical shape.

  Another feature of the present invention is that, in the surgical needle detection device, the detection bar has a flat surface portion at least at a part of the distal end portion.

  According to another feature of the present invention configured as described above, the surgical needle detection device has a planar portion formed in a planar shape at least at a part of the distal end portion of the detection rod body, so that the surgical needle is in line contact or It can be received by surface contact so that the surgical needle can be easily adsorbed and the once adsorbed surgical needle can be made difficult to fall off.

  Another feature of the present invention is that, in the surgical needle detection device, the flat surface portion of the detection rod body is a front end surface that closes one end portion of the cylindrical body portion formed in a cylindrical shape.

  According to another feature of the present invention configured as described above, the surgical needle detection device has a detection portion inserted into the body because the flat surface portion of the detection rod body is a distal end surface that closes one end portion of the cylinder main body portion. The surgical needle can be collected at the most distal portion of the rod, and the surgical needle can be effectively captured and collected.

It is a perspective view showing the outline of the appearance composition of the surgical needle detection device concerning one embodiment of the present invention. FIG. 2 is an internal configuration cross-sectional view schematically showing an internal configuration and a system configuration of the surgical needle detection apparatus shown in FIG. 1. It is a block diagram which shows the system configuration | structure of the surgical needle detection apparatus shown in FIG. 2 in detail. It is a fragmentary perspective view which expands and shows the state by which the surgical needle M which consists of a suture needle | hook is magnetically adsorbed at the front-end | tip part of the detection rod body in the surgical needle detection apparatus shown in FIG. It is a partially cutaway side view for demonstrating the internal structure of the detection rod body in the surgical needle detection apparatus shown in FIG. It is the elements on larger scale which expand and show the front-end | tip part of the detection rod shown in FIG. It is the flowchart which showed the operation | work process which detects a magnetic body from a patient's body using the surgical needle detection apparatus shown in FIG. It is a flowchart which shows the process of the detection correction value calculation program performed by the control apparatus shown in FIG. The detection correction value calculation principle will be described using the maximum and minimum values of the first detection signal value and the two corresponding detection values corresponding to the second detection signal values in the detection correction value calculation program shown in FIG. For this reason, it is explanatory drawing which showed both relationship. It is a flowchart which shows the process of the magnetic body detection program performed by the control apparatus shown in FIG. It is the elements on larger scale which expand and show the internal structure of the front-end | tip part of the detection rod in the surgical needle detection apparatus which concerns on the modification of this invention. It is the elements on larger scale which expand and show the internal structure of the front-end | tip part of the detection rod in the surgical needle detection apparatus which concerns on the other modification of this invention. (A), (B) is a perspective view which shows the outline of an external appearance structure of the surgical needle detection apparatus which concerns on the other modification of this invention.

  Hereinafter, an embodiment of a surgical needle detection device according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an outline of an external configuration of a surgical needle detection device 100 according to the present invention. 2 is a cross-sectional view of the internal configuration schematically showing the internal configuration and system configuration of the surgical needle detection apparatus 100 shown in FIG. FIG. 3 is a block diagram showing the system configuration of the surgical needle detection apparatus 100 shown in FIG. 2 in more detail. Note that each drawing referred to in the present specification is schematically represented by exaggerating some of the components in order to facilitate understanding of the present invention. For this reason, the dimension, ratio, etc. between each component may differ. The surgical needle detection device 100 is a device for checking whether or not a surgical needle M such as an anastomosis needle, a suture needle, or an injection needle is placed in the body during a human operation.

(Configuration of Surgical Needle Detection Device 100)
The surgical needle detection device 100 includes a main body case 101. The main body case 101 is a hollow part that houses various components of the surgical needle detection device 100 and constitutes the casing of the surgical needle detection device 100. The main body case 101 is formed by molding a resin material into a size and shape that can be operated by a user of the surgical needle detection device 100 by hand. More specifically, the main body case 101 is configured by integrally forming a main body portion 101a extending in the illustrated horizontal direction and a grip portion 101b extending from the lower portion of the main body portion 101a in the illustrated diagonally downward direction. . In addition, the main body case 101 constitutes one main body case 101 by combining two halves divided into two in the thickness direction.

  A control board 120, which will be described later, is provided at the center of the main body 101a. Further, the main body 101a is provided with a connecting portion 102 at one end (the left side in the drawing) and a power switch 103 at the other end (the right side in the drawing). The connecting portion 102 is a component that detachably connects a detection rod 110 described later, and is formed in a cylindrical shape into which the detection rod 110 can be inserted. That is, the connection part 102 is configured by a receptacle-type connector that electrically and physically couples the detection rod 110 and the control board 120. One end (left side in the figure) of the connection part 102 is exposed to the outside of the main body part 101a, and the other (right side in the figure) is positioned on the main body part 101a and electrically connected to the control board 120.

  The power switch 103 is an electrical component for controlling the activation or deactivation of the surgical needle detection device 100 by supplying or blocking power to the control board 120 in accordance with a manual operation of a user (not shown). It is. In the present embodiment, the power switch 103 is constituted by a rocker switch. The power switch 103 is provided in a state where a portion operated by the user is exposed to a position where the user can operate with the thumb of the user who grips the grip portion 101b on the outer surface of the main body portion 101a. That is, the power switch 103 is provided on the side opposite to the connection portion 102 in the main body 101a.

  The grip portion 101b is a portion that is held by the user of the surgical needle detection device 100 and holds the entire surgical needle detection device 100, and has a thickness that allows the user to hold it with one hand. The grip portion 101b is configured such that a part of the outer surface can be removed detachably, and a battery case 104 is provided inside the removable portion. The battery case 104 is a part that detachably holds a battery 105 that is a power source of power supplied to the control device 122, and is electrically connected to the control board 120 via the power switch 103.

  In addition, the grip portion 101b is provided with an operation element 106 on the end portion side on the main body portion 101a side. The operation element 106 is a push button type input device that is operated when the surgical needle detection device 100 detects a magnetic substance in the body and gives an instruction to the control device 122 described later. The operation element 106 is provided at a position where it can be operated with the index finger or middle finger of the user who holds the grip portion 101 b while being electrically connected to the control device 122. In FIG. 1, the user's hand holding the grip portion 101b is indicated by a two-dot chain line.

  As shown in FIGS. 4 to 6, the detection rod 110 is a component that is inserted into the body of a patient (not shown) undergoing surgery and detects the surgical needle M, and mainly includes a casing 111, a connection Unit 112, first magnetic sensor 113, and second magnetic sensor 115, respectively. The casing 111 is a portion that accommodates the first magnetic sensor 113 and the second magnetic sensor 115 and is inserted into the patient's body, and is magnetically neutral (permeability “1”) non-magnetic (for example, (Resin material, aluminum material, stainless steel material, ceramic material, etc.) are formed in an elongated hollow rod shape.

  More specifically, the casing 111 is formed in a bottomed cylindrical shape in which one end (left side in the figure) of the cylinder is closed and the other end (right side in the figure) is opened. In this case, in the casing 111, the most distal end portion 111b that closes the one end portion of the tubular body portion 111a formed in a tubular shape is formed in a planar shape, and the thickness of the most distal end portion 111b is set to be a tubular body. It is formed thinner than the thickness of the portion 111a. In this case, the thickness of the most advanced portion 111b may be 2/3 or less, more preferably 1/2 or less, of the thickness of the cylinder main body 111a. In the present embodiment, the casing 111 is formed with an outer diameter of 10 mm, a length of 130 mm, a thickness of the cylinder main body 111a of 1 mm, and a thickness of the most advanced portion 111b of 0.5 mm.

  The connecting part 112 is a part for detachably connecting the casing 111 to the connecting part 102 in the main body case 101, and is formed in a shaft shape with a thickness that can be inserted into the connecting part 102. In this case, the connecting portion 112 is formed with a hook portion 112a that is elastically hooked to the inner peripheral surface of the connecting portion 102 on the outer peripheral surface, and from the inside of the connecting portion 102 unless the user pulls it strongly by hand. It is configured not to come out. That is, the connecting portion 112 is configured by a round plug connector having a male pin that is electrically and physically connected to the connecting portion 102.

  The first magnetic sensor 113 is a component for detecting the surgical needle M placed in the patient's body, and is provided at the distal end portion 111 c adjacent to the most distal portion 111 b in the casing 111. The first magnetic sensor 113 mainly includes a detection element 113a, a substrate 113b, and a magnetic field generator 113c.

  The detection element 113a is composed of an element that converts magnetic energy into electric energy and outputs the electric energy. In the present embodiment, the detection element 113a is composed of a magnetoresistive element whose resistance value changes depending on the strength of the magnetic field. In this case, the detection element 113a may be configured by connecting two magnetoresistive elements in series, but may be configured by connecting four magnetoresistive elements in a bridge shape. In the present embodiment, the detection element 113a is formed in a chip shape having a size of 0.7 mm × 0.7 mm in length and width, and has a sensitivity of 15.0 kA / m. The detection element 113a is electrically connected to the control device 122 via the signal line 114a.

  The substrate 113b is a component that supports the detection element 113a and the magnetic field generator 113c, and is configured by forming an epoxy resin material into a plate-like body. The substrate 113b fixedly supports the detection element 113a on one surface (the upper surface in the drawing) via an adhesive (not shown), and the magnetic field generator 113c on the other surface (the lower surface in the drawing). It is fixed to the inner peripheral surface of the casing 111 with an adhesive (not shown) in a state of being fixedly supported via the not shown.

  The magnetic field generator 113c applies a magnetic bias to the detection element 113a to shift the operating point of the detection element 113a to a linear region of resistance change, and at the same time, the surgical needle M present around the most distal portion 111b of the detection rod 110. It is a magnet for adsorbing magnetically. In the present embodiment, the magnetic field generator 113c is formed by a neodymium magnet having a plate shape of 6 mm × 6 mm in length and width, 4 mm in thickness, a surface magnetic flux density of 350 mT, and an attractive force (attraction force) of 0.9 kgf. It is configured. The magnetic field generator 113c is disposed to face the detection element 113a through the substrate 113b. In this case, the magnetic field generator 113c is positioned at a position where the resistance value linearly changes with respect to the change in the magnetic field intensity and the output signal is not saturated.

  The second magnetic sensor 115 is a component for canceling the influence of geomagnetism, and includes a detection element 115a, a substrate 115b, and a magnetic field generator 115c similar to the detection element 113a, the substrate 113b, and the magnetic field generator 113c. Yes. The detection element 115a is composed of an element that converts magnetic energy into electric energy and outputs the same as the detection element 113a. In the present embodiment, the detection element 115a is composed of a magnetoresistive element whose resistance value varies depending on the strength of the magnetic field. In this case, the detection element 115a may be configured by connecting two magnetoresistive elements in series, but may be configured by connecting four magnetoresistive elements in a bridge shape. In the present embodiment, the detection element 115a is formed in a chip shape having a size of 0.7 mm × 0.7 mm in length and width, and has a sensitivity of 15.0 kA / m. The detection element 115a is electrically connected to the control device 122 through a signal line 114b.

  Similarly to the substrate 113b, the substrate 115b is a component that supports the detection element 115a and the magnetic field generator 115c, and is configured by forming an epoxy resin material into a plate-like body. The substrate 115b fixedly supports the detection element 115a on one surface (the upper surface in the drawing) via an adhesive (not shown), and the magnetic field generator 115c on the other surface (the lower surface in the drawing). It is fixed to the inner peripheral surface of the casing 111 with an adhesive (not shown) in a state of being fixedly supported via the not shown.

  Similar to the magnetic field generator 113c, the magnetic field generator 115c is a magnet for applying a magnetic bias to the detection element 115a to shift the operating point of the detection element 115a to a linear region of resistance change. In the present embodiment, the magnetic field generator 115c is formed by a neodymium magnet having a plate shape of 6 mm × 6 mm in length and 4 mm in thickness, a surface magnetic flux density of 350 mT, and an attractive force (attraction force) of 0.9 kgf. It is configured. The magnetic field generator 115c is disposed to face the detection element 115a via the substrate 115b.

  In this case, the magnetic field generator 115c is positioned at a position where the resistance value linearly changes with respect to the change in the magnetic field intensity and the output signal does not saturate. The magnetic field generator 115c does not necessarily need to be composed of a magnet having the same magnetic force as that of the magnetic field generator 113c as long as the operating point of the detection element 115a can be changed. It is comprised with the magnet which has the same characteristic as 113c.

  The second magnetic sensor 115 is provided at a position separated from the first magnetic sensor 113 in order to cancel the influence of geomagnetism. In the present embodiment, the second magnetic sensor 115 is provided in the casing 111 at a position about 80 mm away from the first magnetic sensor 113.

  The control board 120 includes amplifiers 121a and 121b, a control device 122, a drive circuit 124, and the like for performing detection processing of the surgical needle M using detection signals output from the first magnetic sensor 113 and the second magnetic sensor 115, respectively. The electronic circuit board includes a display device 125 and a buzzer 126, and is mounted in the main body 101 a of the main body case 101.

  The amplifiers 121a and 121b amplify the first detection signal composed of the electrical signal output from the first magnetic sensor 113 and the second detection signal composed of the electrical signal output from the second magnetic sensor 115, respectively, to the control device 122. Each is an electric circuit that outputs.

  The control device 122 is configured by a microcomputer including a CPU, a ROM, a RAM, and the like, and in accordance with an instruction from a user via the operation unit 106, a detection correction value calculation program stored in a storage device such as a ROM, and the like The surgical needle M around the most distal portion 111b of the detection rod 110 is detected by executing the magnetic body detection program.

  In this case, the control device 122 controls the operations of the first magnetic sensor 113 and the second magnetic sensor 115 via the drive circuit 124, respectively. In addition, the control device 122 includes an A / D converter 123, and detects the first detection signal and the second detection signal, which are analog signals input via the amplifiers 121a and 121b, by converting them into digital signals, respectively. The surgical needle M around the leading edge 111b of the rod 110 is used for detection. In addition, the control device 122 outputs the detection status of the surgical needle M around the most distal portion 111b of the detection rod 110 to the outside through the display device 125 and the buzzer 126, respectively.

  Here, the drive circuit 124 is an electric circuit for applying a predetermined constant voltage (for example, 5 V) to the first magnetic sensor 113 and the second magnetic sensor 115 by being controlled by the control device 122. The display device 125 is a light emitting element that is controlled by the control device 122 to notify the outside of the detection state of the surgical needle M around the most distal portion 111b of the detection rod 110 by turning on the light. It is provided in a state of being exposed on the outer surface. In the present embodiment, the display device 125 includes four LED light emitting elements (Light Emitting Diodes). The buzzer 126 is a sounding device that is controlled by the control device 122 to notify the outside of the detection state of the surgical needle M around the most distal portion 111b of the detection rod 110 by the generation of sound.

(Operation of Surgical Needle Detection Device 100)
Next, the operation of the surgical needle detection apparatus 100 configured as described above will be described with reference to FIG. First, a user (for example, a doctor) of the surgical needle detection device 100 prepares the surgical needle detection device 100 during the operation of a patient (not shown) as the first step. Specifically, the user prepares the main body case 101 and the detection rod 110, respectively.

  Next, the user attaches the detection rod 110 to the main body case 101 as a second step. Specifically, the user inserts the connecting portion 112 in the detection rod 110 into the connecting portion 102 in the main body case 101. As a result, the detection rod 110 is integrated with the main body case 101 by the hook 112a being hooked on the inner peripheral surface of the connection 102. In this case, the first magnetic sensor 113 and the second magnetic sensor 115 in the detection rod 110 are electrically connected to the control board 120.

  Next, as a third step, the user operates the power switch 103 of the surgical needle detection device 100 to turn on the control device 122 of the surgical needle detection device 100. Thereby, the control apparatus 122 will be in the standby state which waits for the instruction | indication from a user by running the control program which is not shown in figure.

  Next, the user performs a detection correction value acquisition operation as a fourth step. This detection correction value acquisition step is to acquire a detection correction value for eliminating variations in detection characteristics (output characteristics) in the same magnetic field between the first magnetic sensor 113 and the second magnetic sensor 115, that is, This is a calibration for eliminating individual differences in detection sensitivity between the first magnetic sensor 113 and the second magnetic sensor 115. Specifically, the user instructs the control device 122 to acquire the detection correction value by performing a predetermined operation (for example, double-clicking) on the operation element 106.

  In response to this instruction, the control device 122 acquires the detection correction value by executing the detection correction value calculation program shown in FIG. Specifically, the control device 122 starts execution of the detection correction value calculation program in step S100, and starts the operation of the first magnetic sensor 113 and the second magnetic sensor 115 in step S102. Specifically, the control device 122 controls the operation of the drive circuit 124 and applies the same voltage to the first magnetic sensor 113 and the second magnetic sensor 115, respectively, to thereby apply the first magnetic sensor 113 and the second magnetic sensor 115. Start each operation. Thus, the first magnetic sensor 113 and the second magnetic sensor 115 respectively receive the first detection signal and the second detection signal corresponding to the strength of the magnetic field around each of the first magnetic sensor 113 and the second magnetic sensor 115, respectively. Output.

  Next, in step S104, the control device 122 stores the first detection signal and the second detection signal by a predetermined amount. Specifically, the control device 122 acquires each value of the first detection signal and the second detection signal output from the first magnetic sensor 113 and the second magnetic sensor 115, respectively, at a predetermined time interval during a predetermined time. And stored as a first detection signal value and a second detection signal value, respectively. For example, the control device 122 continues to store each value of the first detection signal and the second detection signal as a pair every 0.01 seconds for several seconds to several tens of seconds.

  In this case, the control device 122 stores each value of the first detection signal and the second detection signal in a temporary storage device built therein. In each storage process of the first detection signal and the second detection signal, the user can change the position and orientation of the grasped surgical needle detection device 100 to change the position corresponding to the magnetic environment around the user. Each of the first detection signal value and the second detection signal value can be acquired. In this case, the user can change the position and orientation of the detection rod 110 by holding the grip portion 101b and changing the orientation and position of the hand.

  Next, the control apparatus 122 calculates a detection correction value in step S106. Specifically, the control device 122 extracts the maximum value and the minimum value of the first detection signal values stored in step S104, and acquires them at the same timing as the maximum value and the minimum value. Each value of the second detection signal value is extracted as a corresponding detection value.

Next, the control device 122 uses the maximum value and the minimum value of the first detection signal and the corresponding detection values paired with the first detection signal to change the second detection signal value to the first detection signal value as shown in Equation 1 below. The correction coefficient α and the offset value β for specifying the same value are specified. In this case, as shown in FIG. 9, the correction count α is equal to the slope of the straight line L1 connecting the maximum value and the minimum value of the first detection signal and the straight line L2 connecting the two corresponding detection values of the second detection signal. It is a count for correcting the inclination of. The offset value β is a correction value for the difference in the magnitude of the detection signal between the straight line L1 and the straight line L2.
<Equation 1>
First detection signal value = second detection signal value × correction count α + offset value β

  The interval between the maximum value and the minimum value of the first detection signal on the horizontal axis in FIG. 9 may be determined in advance, or the timing at which the maximum value is acquired and the timing at which the minimum value is acquired. It's also good time. Further, to match the second detection signal value to the first detection signal value may mean that the second detection signal value is exactly the same as the first detection signal value in a strict sense, but the second detection signal value is the first detection signal value. The signal value can be made substantially the same value within a predetermined range. That is, these correction count α and offset value β correspond to detection correction values.

  The detection correction value may be any value as long as the first detection signal value and the second detection signal value can be made substantially the same value, and is not necessarily constituted by the correction count α and the offset value β. . Therefore, for example, the detection correction value can be configured only by the offset value β. Specifically, the control device 122 sets the average value of the difference between each value of the first detection signal value and each value of the second detection signal value corresponding to each value of the first detection signal value as the offset value β. It can also be a detection correction value. Further, the detection correction value can be configured by only the correction count α, for example.

  Next, in step S108, the control device 122 stores the detection correction value calculated in step S106 in a temporary storage device built therein. Then, in step S110, the control device 122 controls the operation of the drive circuit 124 to stop the application of voltage to the first magnetic sensor 113 and the second magnetic sensor 115, and the first magnetic sensor 113 and the second magnetic sensor. After each operation of the sensor 115 is stopped, the execution of this detection correction value calculation program is terminated in step S112. As a result, the control device 122 acquires the detection correction value.

  The execution of the detection correction value calculation program corresponds to the detection correction value calculation step according to the present invention, and the control device 122 that executes the detection correction value calculation program corresponds to the detection correction value calculation means according to the present invention. The detection correction value calculation program for obtaining the detection correction value is automatically executed when the power switch 103 of the surgical needle detection apparatus 100 is operated to turn on the power. You can also.

  Next, the user performs the operation of detecting the surgical needle M in the patient's body as the fifth step. Specifically, the user instructs the control device 122 to detect the surgical needle M by performing a predetermined operation (for example, pressing and holding) the operation element 106. In response to this instruction, the control device 122 executes the magnetic body detection program shown in FIG.

  Specifically, the control device 122 starts execution of the magnetic body detection program in step S200, and determines in step S202 whether or not a detection correction value has been acquired. In this case, when the detection correction value is acquired (stored), the control device 122 determines “Yes” in this determination process, and proceeds to step S204. On the other hand, when the detection correction value is not acquired (stored), the control device 122 determines “No” in this determination process, proceeds to step S212, and ends the execution of the magnetic body detection program. . That is, the control device 122 does not perform the detection process of the surgical needle M unless the detection correction value is acquired.

  Next, the control apparatus 122 acquires a reference | standard comprehensive detection value in step S204. Here, the reference comprehensive detection value is a value used as a reference (threshold) when determining the presence or absence of the surgical needle M. The process of acquiring the reference comprehensive detection value includes the following processes of sub-step 1 to sub-step 3.

  Sub-step 1: First, the control device 122 acquires each value of the first detection signal and the second detection signal output from the first magnetic sensor 113 and the second magnetic sensor 115, respectively.

Sub-step 2: Next, the control device 122 obtains a corrected second detection signal value by substituting the detection correction value and the second detection signal value acquired in the sub-step 1 into the following equation 2, respectively.
<Equation 2>
Correction second detection signal value = second detection signal value × correction count α + offset value β

Sub-step 3: Next, the control device 122 calculates the reference total detection value by substituting the first detection signal value acquired in the sub-step 1 and the calculated corrected second detection signal value into the following Equation 3, respectively. Then, it is recorded in the temporary storage device. Thereby, the control apparatus 122 can acquire one reference | standard comprehensive detection value. The acquisition processing of the reference total detection value in step S204 may be executed immediately before the user inserts the detection rod 110 into the patient's body. That is, the user may instruct the control device 122 to execute the magnetic body detection program by operating the operating element 106 immediately before inserting the detection rod 110 into the patient's body.
<Equation 3>
Reference comprehensive detection value = first detection signal value−corrected second detection signal value

  Next, the control apparatus 122 performs the detection process of the surgical needle M in step S206. Here, the detection process of the surgical needle M is a process of detecting the presence or absence of the surgical needle M around the leading edge 111b of the detection rod 110. Therefore, the user operates the grasped surgical needle detection device 100 to insert and move the most distal portion 111b of the detection rod 110 into the patient's body to search for the surgical needle M. In this case, the user inserts and moves the most distal portion 111b of the detection rod 110 into the patient's body by grasping the grip portion 101b. The detection process of the surgical needle M includes the following processes of sub-step 1 to sub-step 5.

  Sub-step 1: First, the control device 122 starts the operation of the first magnetic sensor 113 and the second magnetic sensor 115. Specifically, the control device 122 controls the operation of the drive circuit 124 and applies the same voltage to the first magnetic sensor 113 and the second magnetic sensor 115, respectively, to thereby apply the first magnetic sensor 113 and the second magnetic sensor 115. Start each operation. Thus, the first magnetic sensor 113 and the second magnetic sensor 115 respectively receive the first detection signal and the second detection signal corresponding to the strength of the magnetic field around each of the first magnetic sensor 113 and the second magnetic sensor 115, respectively. Output.

  Substep 2: Next, the control device 122 acquires each value of the first detection signal and the second detection signal output from the first magnetic sensor 113 and the second magnetic sensor 115, respectively.

  Sub-step 3: Next, the control device 122 obtains a corrected second detection signal value by substituting the detection correction value and the second detection signal value acquired in the sub-step 1 into the above equation 2, respectively. Accordingly, the control device 122 can obtain a corrected second detection signal value in which variations in detection accuracy between the first magnetic sensor 113 and the second magnetic sensor 115 are canceled.

Sub-step 4: Next, the control device 122 substitutes the first detection signal value acquired in the sub-step 1 and the calculated corrected second detection signal value into the following Equation 3 to obtain a total detection value. Thereby, the control device 122 can obtain a comprehensive detection value in which the influence of the geomagnetism around the detection rod 110 is canceled.
<Equation 4>
Total detection value = first detection signal value−corrected second detection signal value

  Sub-step 5: Next, the control device 122 determines the detection of the surgical needle M. Specifically, the control device 122 calculates a difference between the reference total detection value and the total detection value calculated in the sub-step 3 as a detection difference value, and the detection difference value is set in the control device 122 in advance. It is determined whether the value exceeds the predetermined range.

  In this case, if the detection difference value is outside the predetermined range, the control device 122 determines “Yes” in this determination process and proceeds to step S208. On the other hand, if the detection difference value is within a predetermined range, the control device 122 determines “No” in this determination process and proceeds to step S210. That is, when a surgical needle M such as a suture needle is present in the vicinity of the most distal portion 111b of the detection rod 110, the magnetic field state around the first magnetic sensor 113 changes, and therefore the first detection signal value and the first detection signal value There is a difference between the two detection signal values (corrected second detection signal value).

  Therefore, the control device 122 detects the maximum value of the detection rod 110 when the detection difference value, which is the difference between the first detection signal value and the second detection signal value (corrected second detection signal value), is outside the predetermined range. Assuming that there is some surgical needle M such as a suture needle in the vicinity of the distal end portion 111b, it is determined as “Yes”, and the process proceeds to Step S210.

  As described above, the control device 122 uses the reference total detection value, so that the reference total detection value is obtained even when a difference occurs between the magnetic field state at the time of calculating the detection correction value and the current magnetic field state. Can be used to maintain the detection accuracy of the surgical needle M. The control device 122 that executes the detection process of the surgical needle M in step S206 corresponds to the magnetic body determination unit according to the present invention.

  Next, the control device 122 operates the display device 125 and the buzzer 126 in step S208. In this case, the control device 122 may turn on all four LEDs constituting the display device 125 at the same time, but the number of LEDs to be turned on is increased stepwise according to the magnitude of the detection difference value. It may be. Further, the control device 122 may sound the buzzer 126 with a continuous sound of a constant volume, but gradually increases the volume or changes the intermittent sound to a continuous sound according to the magnitude of the detection difference value. You may pronounce it. Thus, the user can visually and visually recognize that some surgical needle M such as a suture needle is present in the vicinity of the most distal end portion 111b of the detection rod 110.

  In this case, in the surgical needle detection device 100, the surgical needle M in which the magnetic field generator 113c constituting the first magnetic sensor 113 is present around the most distal portion 111b of the detection rod 110 (for example, a range within 10 mm). Therefore, the surgical needle M such as a suture needle can be magnetically attracted to the most advanced portion 111b. Accordingly, the control device 122 stores in advance the magnitude of the detection difference value when the surgical needle M is adsorbed to the most advanced portion 111b of the detection rod 110, so that the detection difference value is stored in advance. When the value exceeds the value, the display device 125 and the buzzer 126 are operated or changed in operation, so that the user can be notified of the suction of the surgical needle M to the most advanced portion 111b.

  Thereby, the user can collect the surgical needle M such as a suture needle placed in the body by operating the surgical needle detection device 100 and detaching the detection rod 110 from the body (see FIG. 4). . 4 shows a state in which the surgical needle M is attracted to the most distal portion 111b of the casing 111, the surgical needle M is the surface of the casing 111 around the magnetic field generator 113c, that is, a detection rod. If it is the front-end | tip part of 110, it may adsorb | suck also to cylinder main-body parts 111a other than the most advanced part 111b.

  Next, in step S210, the control device 122 determines whether or not to end the operation for detecting the surgical needle M. Specifically, the control device 122 determines whether or not the operation element 106 has been operated (for example, release of the pressed state). In this case, the control device 122 continues to determine “No” in this determination process until the operation element 106 is operated (for example, release of the pressed state), and returns to step S206. And the control apparatus 122 performs the process which detects the presence or absence of the surgical needle M in step S206 again. That is, in this embodiment, the control device 122 executes the detection process of the surgical needle M while the operation element 106 is pressed.

  On the other hand, when the operation element 106 is operated (for example, release of the pressed state), the control device 122 determines “Yes” in this determination process, and executes the magnetic body detection program in step S212. Exit. In this case, the control device 122 controls the operation of the drive circuit 124 to stop the application of voltage to the first magnetic sensor 113 and the second magnetic sensor 115, and each of the first magnetic sensor 113 and the second magnetic sensor 115. The operation is stopped, and when the display device 125 and the buzzer 126 are operating, the operations of these devices are stopped.

  Next, the user performs an end operation as the sixth step. Specifically, the user operates the power switch 103 of the surgical needle detection device 100 to turn off the power of the control device 122 of the surgical needle detection device 100, and then removes the detection rod 110 from the main body case 101. In this case, the user can remove the detection bar 110 from the main body case 101 by pulling the detection bar 110 in the axial direction with respect to the main body case 101. In this case, the user can use the detection rod 110 again by cleaning and disinfection. However, the detection accuracy of the first magnetic sensor 113 and the second magnetic sensor 115 is reduced and the hygiene aspect of the casing 111 is used. Can be discarded without being reused.

  As can be understood from the above description of operation, according to the above embodiment, the surgical needle detection device 100 has a magnetic force that can magnetically attract the surgical needle M to the distal end portion 111c of the detection rod 110 inserted into the body. Since the magnetic field generator 113c is provided, the surgical needle M placed in the body can be attracted to the distal end portion of the detection rod body 110 and collected by inserting the distal end portion of the detection rod body 110 into the body. . In addition, the surgical needle detection device 100 according to the present invention includes the control device 122, the first magnetic sensor 113, and the second magnetic sensor 115 serving as the magnetic body determination unit and the magnetic body determination unit, respectively. The presence or recovery of the surgical needle M can be detected.

  Furthermore, in carrying out the present invention, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the object of the present invention. In the following modifications, the same reference numerals are given to the same components as those in the above embodiment, and the description thereof is omitted.

  For example, in the above embodiment, the surgical needle detection device 100 is configured such that the detection rod 110 is detachably attached to the main body case 101. However, the surgical needle detection device 100 may be configured such that the detection rod body 110 and the main body case 101 are integrally formed so as not to be separated from each other, and the main body case 101 and the detection bar body are flexible. They may be linked (ie, wired connection) via a cord.

  Moreover, in the said embodiment, the detection rod 110 formed the thickness of the most advanced part 111b thinner than the thickness of the cylinder main-body part 111a. Thereby, the detection rod 110 can make it easy to magnetically adsorb the detected surgical needle M to the most advanced portion 111b while maintaining the rigidity of the elongated detection rod 110. However, the detection rod 110 only needs to be formed so that the thickness of the tip 111c of the detection rod 110 is smaller than the thickness of the tip. Here, the distal end portion 111 c is a portion on the most distal end portion 111 b side from the central portion of the detection rod 110.

  Therefore, for example, as shown in FIG. 11, the detection rod 110 has a thickness of the tip 111 c that is greater than that of the detection rod 110 other than the tip 111 c, specifically the center of the detection rod 110. It can be formed thinner than the thickness of the portion on the main body case 101 side. In addition, the thickness of the cylinder main body 111a and the wall thickness of the most advanced part 111b may be formed to the same thickness, or the wall thickness of the most distal part 111b is formed thicker than the wall thickness of the cylinder main body 111a. You can also

  Moreover, in the said embodiment, the detection rod 110 formed the most advanced part 111b in planar shape. That is, the most advanced part 111b corresponds to the flat part according to the present invention. Thereby, the surgical needle detection apparatus 100 can receive the surgical needle M by line contact or surface contact, can easily adsorb the surgical needle M, and can make the surgical needle M once adsorbed difficult to drop off. However, the flat surface portion only needs to be formed on at least a part of the tip portion 111c. Therefore, the flat surface portion may be provided, for example, on a part of a cylindrical surface constituting the tube main body portion 111a. Note that the detection rod 110 can adsorb the surgical needle M even if it does not have a flat surface portion. For example, the detection rod 110 can adsorb the surgical needle M even if the most advanced portion 111b is formed in a curved surface (for example, a hemispherical surface).

  Moreover, in the said embodiment, the detection rod 110 comprised the cylinder main-body part 111a and the most advanced part 111b integrally. However, as shown in FIG. 12, the detection rod body 110 can also be integrated by using a technique such as welding or bonding by forming the most advanced portion 111b separately from the tube main body portion 111a. In this case, the foremost part 111b is configured to be fitted to the distal end part of the cylinder main body part 111a. According to this, the surgical needle detection device 100 can facilitate and improve the assembly work of the first magnetic sensor 113. In addition, the surgical needle detection device 100 can efficiently manufacture a plurality of types of detection rods 110 by preparing the most distal end portion 111b having a plurality of thicknesses for one tube main body portion 111a. At the same time, the most advanced part 111b can be replaced.

  Moreover, in the said embodiment, the main body case 101 was comprised by the main-body part 101a and the grip part 101b. More specifically, the main body portion 101a is configured by forming a box-shaped main body portion 101a in a direction intersecting with one end portion of the grip portion 101b extending in a bar shape. However, the main body case 101 only needs to be formed in a size that can be held and held at least by hand and can accommodate the control device 122 therein.

  Therefore, for example, as shown in FIGS. 13A and 13B, the main body case 101 can be configured by only a rod-shaped grip main body 101c that can be gripped by hand. That is, the grip main body 101c is the same as the grip 101b in the main body 101a in the above embodiment. In this case, the grip body 101c has a connecting portion 102 at one end in the longitudinal direction and a power switch 103 at the other end. In the surgical needle detection device 100 formed in such a shape, the body case 101 can be easily inserted into a narrow place such as a human head and operated by gripping the main body case 101 like a knife or a pencil. In FIGS. 13A and 13B, the user's hand holding the main body 101c is indicated by a two-dot chain line.

  Moreover, in the said embodiment, the surgical needle detection apparatus 100 assumed the battery 105 as the dry battery. However, it is a matter of course that the battery 105 may be a storage battery that can be repeatedly used by charging. In this case, the surgical needle detection device 100 may include a connector for charging the battery 105 in a part of the main body case 101.

  The first magnetic sensor 113 and the second magnetic sensor 115 are composed of magnetoresistive elements. However, the first magnetic sensor 113 and the second magnetic sensor 115 are not necessarily limited to the above-described embodiments as long as they are elements that can convert a change in magnetic energy around the detection rod 110 into electric energy and output it. Is not to be done. That is, the first magnetic sensor 113 and the second magnetic sensor 115 correspond to the magnetic body detection means according to the present invention. Therefore, the magnetic substance detecting means can be constituted by an element other than the magnetoresistive element, for example, a Hall element, a GMR sensor or an MI sensor.

  Moreover, in the said embodiment, the permanent magnet which consists of a neodymium magnet which has a magnetic force of the grade which can adsorb | suck the surgical needle M which exists in the periphery of the detection rod 110 for the magnetic field generator 113c which comprises the 1st magnetic sensor 113. Consists of. However, the magnetic field generator 113c only needs to be able to attract the surgical needle M present around the detection rod 110, and a magnet other than a neodymium magnet, for example, various magnets such as ferrite, samarium cobalt, or alnico may be used. it can. Moreover, the magnetic field generator 113c can also be comprised with the coil which converts an electrical energy into a magnetic energy besides a permanent magnet. In these cases, the periphery of the detection rod 110 is a range within 10 mm, preferably within a range of 20 mm, more preferably within a range of 30 mm with respect to the most distal portion 111b of the detection rod 110. In addition, the magnetic field generator 115c can be comprised with various permanent magnets or coils similarly to the magnetic field generator 113c.

  In the above-described embodiment, the control device 122 executes the detection correction value calculation program by double-clicking the operation element 106 (an operation for quickly pressing the operation element twice in succession without opening a gap). The magnetic body detection program is configured to be executed by continuing to press the button. However, the instruction to the control device 122 for each execution of the detection correction value calculation program and the magnetic body detection program may be another operation method of the operator 106 (for example, a so-called long press that maintains the pressed state for a predetermined time). It is natural to be good. In addition, the control device 122 can be configured to automatically execute the detection correction value calculation program once or a plurality of times every predetermined time after the power is turned on. The surgical needle detection apparatus 100 can also be provided with an operator 106 for instructing execution of the detection correction value calculation program and an operator 106 for instructing execution of the magnetic body detection program.

  Moreover, in the said embodiment, after acquiring the reference | standard comprehensive detection value in step S204, the magnetic body detection program performed the detection process of the surgical needle M using the reference | standard comprehensive detection value in step S206. However, the magnetic body detection program can also determine the presence or absence of the surgical needle M without using the reference comprehensive detection value. For example, the magnetic body detection program can determine the presence or absence of the surgical needle M based on the total detection value acquired in sub-step 4 in step S206.

  Specifically, the magnetic body detection program determines whether or not the total detection value itself is a value exceeding a predetermined range preset in the control device 122 in sub-step 5 in step S206. To do. In this case, when the comprehensive detection value is outside the predetermined range, the control device 122 determines “Yes” in this determination process, and proceeds to step S208. On the other hand, if the comprehensive detection value is a value within a predetermined range, the control device 122 determines “No” in this determination process, and proceeds to step S210. According to this, the acquisition process of the reference comprehensive detection value in step S204 is not necessary.

  In the above embodiment, the control device 122 starts or stops the operation of the first magnetic sensor 113 and the second magnetic sensor 115 each time the detection correction value calculation program and the magnetic body detection program are executed. Configured. However, the first magnetic sensor 113 and the second magnetic sensor 115 can be configured to start operating when the power of the surgical needle detection apparatus 100 is turned on and stop operating when the power is turned off. In this case, the control device 122 may be configured to ignore the input of the first detection signal and the second detection signal continuously output from the first magnetic sensor 113 and the second magnetic sensor 115 except when necessary.

  In the above embodiment, the control device 122 detects the surgical needle M (step S206) and detects the surgical needle M by executing the detection correction value calculation program and the magnetic body detection program based on the operation of the operator 106. The notification process (step S208) at the time of having performed is each performed. However, the control device 122 only needs to execute the detection process (step S206) and the notification process (step S208) of the surgical needle M as a result based on the operation of the operation element 106.

  Therefore, for example, the control device 122 is configured to automatically start the detection process of the surgical needle M (step S206) after the power of the surgical needle detection apparatus 100 is turned on, and the notification process (step S208). ) Can be configured to start execution based on the operation of the operator 106. In this case, the control device 122 executes the detection process (step S206) of the surgical needle M until the notification process (step S208) is executed based on the operation of the operation element 106. The detection result is as follows. What is necessary is just to comprise so that it may be disregarded.

  Further, for example, the control device 122 is configured to automatically start the notification process (step S208) after turning on the power of the surgical needle detection apparatus 100, and to detect the surgical needle M (step S206). ) Can be configured to start execution based on the operation of the operator 106.

  In the above embodiment, the display device 125 and the buzzer 126 are used as notification means for notifying the user of the operating state of the control device 122 and the detection state of the surgical needle M. However, the notification means only needs to be configured to allow the user to recognize the detection state of the surgical needle M. Therefore, the notification means can be configured to make the user recognize the detection state of the surgical needle M by vibration, for example, by configuring it with a vibrator.

  In the above embodiment, it is assumed that the surgical needle detection device 100 is inserted into a human body and used to detect a magnetic foreign object such as a suture needle. However, the surgical needle detection device 100 can be used to detect a foreign substance made of a magnetic material by being inserted into the body of a non-human animal, a machine instrument, various devices, or a container.

M ... Surgical needle,
DESCRIPTION OF SYMBOLS 100 ... Surgical needle detection apparatus, 101 ... Main body case, 101a ... Main body part, 101b ... Grip part, 101c ... Grip main body part, 102 ... Connection part, 103 ... Power switch, 104 ... Battery case, 105 ... Battery, 106 ... Operation Child,
DESCRIPTION OF SYMBOLS 110 ... Detection rod body, 111 ... Casing, 111a ... Cylindrical main-body part, 111b ... Most advanced part, 111c ... Tip part, 112 ... Connection part, 112a ... Hook part, 113 ... 1st magnetic sensor, 113a ... Detection element, 113b ... Substrate, 113c ... Magnetic field generator, 114a, 114b ... Signal line, 115 ... Second magnetic sensor, 115a ... Detection element, 115b ... Substrate, 115c ... Magnetic field generator,
DESCRIPTION OF SYMBOLS 120 ... Control board, 121a, 121b ... Amplifier, 122 ... Control apparatus, 123 ... A / D converter, 124 ... Drive circuit, 125 ... Display apparatus, 126 ... Buzzer.

Claims (5)

A surgical needle detection device for detecting a surgical needle made of a magnetic material placed in the body,
A detection rod formed into a hollow rod shape and inserted into the body;
Magnetic body detection that outputs a detection signal according to the presence or absence of a magnetic body around the detection rod in the body by using the magnetic field provided by the magnetic field generator that is provided at the tip of the detection rod and generates a magnetic field. Means,
Magnetic body determination means for determining the presence or absence of a magnetic body around the detection rod based on the detection signal,
The magnetic field generator is
A surgical needle detection device having a magnetic force capable of magnetically attracting the surgical needle to the surface of the tip of the detection rod. In the surgical needle detection device according to claim 1,
The magnetic field generator is
A surgical needle detection device characterized by being a permanent magnet. In the surgical needle detection device according to claim 1 or 2,
The detection rod is
The surgical needle detecting device, wherein the distal end portion is formed thinner than portions other than the distal end portion. In the surgical needle detection device according to any one of claims 1 to 3,
The detection rod is
A surgical needle detection device comprising a flat portion at least at a part of the distal end portion. In the surgical needle detection device according to claim 4,
The plane portion of the detection rod is
A surgical needle detection device characterized by being a distal end surface that closes one end of a cylindrical body portion formed in a cylindrical shape.

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