JP2019063175A - Trocar - Google Patents

Abstract

To restrain a trocar from unintentionally getting out of an abdominal cavity.SOLUTION: A trocar according to the present disclosure comprises: a cylindrical body part 2 comprising a first opening part 21 located at one end in a longitudinal direction, and a second opening part 22 located at another end in the longitudinal direction; and a cylindrical cover 3 covering an outer peripheral part of the body part in a slidable state. The cover comprises a first cover 31 and a second cover 32 in order from the side of the first opening part toward the side of the second opening part. The second cover is fixed to the body part at an end part on the side of the second opening part, and is more flexible than the first cover.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to trocars.

  Conventionally, minimally invasive surgery such as laparoscopic surgery has been performed to maintain and improve a patient's quality of life (QOL). In minimally invasive surgery, trocars are used to insert medical instruments such as forceps into the body cavity of a patient. There is also known a trocar provided with a retaining structure (see, for example, Patent Document 1).

JP, 2016-150216, A

  The trocar of the present disclosure includes a cylindrical main body having a first opening located at one end in the longitudinal direction and a second opening located at the other end in the longitudinal direction, and an outer peripheral portion of the main body. And a cylindrical cover that covers in a slidable manner. The cover has a first cover and a second cover in order from the first opening side toward the second opening side. The second cover is fixed to the main body at an end on the second opening side and is more flexible than the first cover.

FIG. 1 is a perspective view of a trocar according to an embodiment of the present disclosure. FIG. 2 is a view showing the trocar of FIG. 1 as viewed in a direction perpendicular to the longitudinal direction, and is a view showing the right half in cross section. FIG. 3 is an enlarged view of a second opening side of the trocar of FIG. 2; FIG. 4 is a perspective view showing the trocar cover of FIG. 1 being slid toward the second opening. FIG. 5 is a view showing the trocar of FIG. 4 as viewed in a direction perpendicular to the longitudinal direction, and is a view showing the right half in cross section. FIG. 6 is an enlarged view of a second opening side of the trocar of FIG. 5; FIG. 7 is a schematic view showing one use state of the trocar of FIG. FIG. 8 is a schematic view showing one use state of the trocar of FIG.

<Trocar>
Hereinafter, a trocar according to an embodiment of the present disclosure will be described in detail with reference to the drawings. However, for convenience of explanation, the drawings referred to in the following simply show only the main members necessary for describing the embodiment. Thus, the trocar of the present disclosure may comprise any component not shown in the figures to which it refers. Further, the dimensions of the members in the drawings do not faithfully represent the dimensions and dimensional ratios of actual components.

  As shown in FIGS. 1 to 6, the trocar 1 of the present embodiment includes a main body 2 and a cover 3.

(Body part)
The main body 2 is a tubular member. The main body 2 of the present embodiment is substantially cylindrical. In addition, as long as the shape of the main-body part 2 is cylindrical, it is not limited to substantially cylindrical shape.

  As shown in FIGS. 1 and 2, the main body portion 2 has a first opening 21 and a second opening 22. The first opening 21 is located at one end of the main body 2 in the longitudinal direction a, and the second opening 22 is located at the other end in the longitudinal direction a. The inner diameter of the first opening 21 is larger than the inner diameter of the second opening 22.

  As shown in FIG. 2, the main body 2 of the present embodiment includes the head 24 and the pipe 25 in order from the first opening 21 side to the second opening 22 side. The head 24 is continuous with the first opening 21, and the pipe 25 is continuous with the second opening 22. The inner diameter of the head 24 is larger than the inner diameter of the pipe 25. In the present embodiment, the trocar 1 is inserted into the patient's body cavity from the second opening 22 side, and the medical instrument (treatment tool) is inserted through the head 24 and the pipe 25 sequentially through the first opening 21. 2. Insert into the patient's body cavity through the opening 22. Examples of the medical device include forceps or an endoscope.

  In the present embodiment, the head 24 and the pipe 25 are connected to each other. Another part may be located between the head 24 and the pipe 25.

  The head 24 and the pipe 25 may be integrally formed. When such a configuration is satisfied, the connection strength between the head 24 and the pipe 25 can be improved. The term “integrally formed” does not mean that after being processed into parts, it is integrated using joining means such as welding, but the entire molded body is integrally made from the same material without using joining means It is in the state of being produced. Examples of the method of molding integrally include injection molding and the like, but are not limited thereto. In addition, the head 24 and the pipe 25 may be comprised by another member as needed.

  On the other hand, as shown in FIG. 3, the main body portion 2 of the present embodiment is located on the second opening 22 side of the outer peripheral portion 23 thereof, and has a step 26 projecting outward. The stepped portion 26 functions as a portion for fixing a second cover 32 described later.

  The dimension of the step 26 in the direction perpendicular to the longitudinal direction a of the main body 2 is the same as the thickness of the second cover 32. According to such a configuration, no step is generated at the boundary between the step 26 and the second cover 32. Therefore, the insertability when the trocar 1 is inserted into the patient's body cavity, and the trocar 1 as the patient's body cavity. It is possible to improve the ease of removal when removing it from the “Identical” may be substantially identical, and may have some errors as long as the effect is exhibited.

  The main body portion 2 is located closer to the second opening 22 than the step 26 in the outer peripheral portion 23 and has a tapered portion 27 whose outer diameter decreases toward the second opening 22. There is. According to such a configuration, it is possible to improve the insertability when the trocar 1 is inserted into the body cavity of the patient.

  The main body portion 2 is located between the step portion 26 and the tapered portion 27 in the outer peripheral portion 23 and has a surface portion 28 extending along the longitudinal direction a of the main body portion 2. According to such a configuration, the portion between the step portion 26 and the tapered portion 27 becomes thick, so that the strength of each of the step portion 26 and the tapered portion 27 can be enhanced.

  In the present embodiment, the surface portion 28 is connected to each of the step portion 26 and the tapered portion 27. In other words, the step 26 and the taper 27 are connected via the surface 28. The stepped portion 26 and the tapered portion 27 may be directly connected without interposing the surface portion 28.

  As a material of the main-body part 2, a synthetic resin etc. are mentioned, for example. As a synthetic resin, a polycarbonate etc. are mentioned, for example.

  The sizes of the main body 2 and the cover 3 can be set to the following values. The length of the pipe 25 in the direction parallel to the longitudinal direction a of the main body 2 shown in FIG. 2 is, for example, 50 to 200 mm. The outer diameter of the cover 3 in the portion covering the head 24 is, for example, 30 mm to 50 mm. The thickness of the cover 3 is, for example, 0.5 to 2 mm. The outermost diameter of the portion of the pipe 25 is, for example, 16 to 18 mm including the thickness of the cover 3. The inner diameter of the pipe 25 is, for example, 12 to 14 mm. In addition, the magnitude | size of the main-body part 2 is not limited to the illustrated numerical range, It can change suitably. The outer diameter of the pipe 25 can be set according to the size of the hole to be made in the patient. The inner diameter of the pipe 25 can be set according to the size of the medical device to be inserted.

(cover)
The cover 3 is a cylindrical member which covers the outer peripheral portion 23 of the main body 2 in a slidable manner. The cover 3 of the present embodiment is substantially cylindrical as shown in FIGS. 1 and 2. The shape of the cover 3 is not limited to a substantially cylindrical shape as long as it has a cylindrical shape and exhibits its function.

  The thickness of the cover 3 is, for example, 0.5 to 2 mm as described above. In addition, the thickness of the cover 3 is not limited to the illustrated numerical range, and can be changed as appropriate.

  The cover 3 has a first cover 31 and a second cover 32 in order from the first opening 21 side to the second opening 22 side. As shown in FIG. 3, the second cover 32 has an end 321 on the first opening 21 side and an end 322 on the second opening 22 side. The second cover 32 is fixed to the main body 2 at the end 322 on the second opening 22 side, and is more flexible than the first cover 31.

  According to the configuration described above, as shown in FIGS. 4 and 5, when the cover 3 is slid toward the second opening 22 indicated by the arrow X, a part of the second cover 32 is indicated by the arrow Y. Project to Then, a part of the second cover 32 protrudes outward, whereby the trocar 1 is configured to be provided with a retaining structure.

  That is, according to the configuration described above, since the second cover 32 is relatively softer than the first cover 31, when the cover 3 is slid to the second opening 22 side, a part of the second cover 32 Is deformed to project outward. In the present embodiment, as shown in FIG. 6, when the cover 3 is slid toward the second opening 22, the second cover 32 is deformed such that the end 321 and the end 322 approach each other. Then, in accordance with this deformation, a portion 323 of the second cover 32 located between the end 321 and the end 322 protrudes outward as shown by the arrow Y. The outwardly protruding portion 323 of the second cover 32 functions as a locking portion that prevents the trocar 1 from unintentionally slipping out of the patient's body cavity.

  The above point will be specifically described by using the trocar 1 for laparoscopic surgery as an example. First, as shown in FIG. 7, when the trocar 1 is inserted into the abdominal cavity 100 of the patient, the cover 3 is not slid to the second opening 22 side. In this state, the trocar 1 can be smoothly inserted into the abdominal cavity 100 since a part of the second cover 32 does not protrude outward.

  Next, as shown in FIG. 8, when the cover 3 is slid toward the second opening 22 shown by the arrow X, a part of the second cover 32 protrudes outward in the abdominal cavity 100. And the site | part 323 which protruded to the outward of the 2nd cover 32 comes to function as a retention part of trocar 1's removal. That is, when the trocar 1 moves in the direction of coming out of the abdominal cavity 100 shown by the arrow Z due to the pressure of the gas pressed into the abdominal cavity 100, the part 323 of the second cover 32 protruding outward contacts the abdominal wall 101 . As a result, the trocar 1 can be prevented from unintentionally coming out of the abdominal cavity 100.

  When the trocar 1 is removed from the abdominal cavity 100 of the patient, the cover 3 is slid toward the first opening 21 in the direction opposite to the arrow X so that a part of the second cover 32 does not protrude outward as shown in FIG. Set to the state shown in. Thereby, trocar 1 can be smoothly removed from the abdominal cavity 100.

  The cover 3 and the main body 2 may be slid relative to each other. For example, by sliding the main body 2 with respect to the cover 3, a part of the second cover 32 may protrude outward. Similarly, by sliding the main body 2 with respect to the cover 3, a part of the second cover 32 may not be protruded outward.

  The cover 3 may not cover the entire outer peripheral portion 23 of the main body 2 as long as the trocar 1 is configured to have the above-described retaining structure when the cover 3 is slid to the second opening 22 side. . Further, the second cover 32 may be softer than the first cover 31 to such an extent that a part thereof protrudes outward when the cover 3 is slid to the second opening 22 side.

  As shown in FIG. 3, the second cover 32 of the present embodiment is fixed to the main body 2 via the step 26. Fixing of the second cover 32 can be performed using, for example, an adhesive or the like, but is not limited thereto. The second cover 32 may be fixed to the main body 2 without the step 26.

  The second cover 32 of the present embodiment is connected to the first cover 31 at an end 321. The connection of the second cover 32 can be performed using, for example, an adhesive or the like, but is not limited thereto. The second cover 32 may be connected to the first cover 31 via another part. In other words, another part may be located between the first cover 31 and the second cover 32.

  As a material of the cover 3, a synthetic resin etc. are mentioned, for example. Examples of the synthetic resin constituting the first cover 31 include relatively hard materials such as polycarbonate, polyethylene terephthalate, polypropylene, polyetheretherketone, nylon 6, and the like. Examples of the synthetic resin that constitutes the second cover 32 include those that are more flexible than the material of the first cover 31, such as silicone, butadiene rubber, chloroprene rubber, and polyurethane elastomer. Further, the same material as that of the synthetic resin constituting the first cover 31 may be included, and the thickness may be reduced, or the like, and may be flexible in comparison with the first cover 31. In addition, each synthetic resin which comprises the 1st cover 31 and the 2nd cover 32 is not limited to the illustrated synthetic resin.

  As mentioned above, although illustrated about embodiment concerning this indication, this indication is not limited to embodiment mentioned above, It can not be overemphasized that it can be arbitrary unless it deviates from the gist of this indication.

DESCRIPTION OF SYMBOLS 1 ... Trocar 2 ... main-body part 21 ... 1st opening part 22 ... 2nd opening part 23 ... outer peripheral part 24 ... head 25 ... pipe 26 ... step part 27 ... Tapered portion 28 ... Surface portion a ... Longitudinal direction 3 ... Cover 31 ... First cover 32 ... Second cover 321 ... End portion 322 ... End portion 323 ... -Site 100 · · · abdominal cavity 101 · · · abdominal wall

Claims (2)

A cylindrical main body having a first opening located at one end in the longitudinal direction and a second opening located at the other end in the longitudinal direction;
And a cylindrical cover slidably covering the outer peripheral portion of the main body portion,
The cover has a first cover and a second cover in order from the first opening side toward the second opening side,
The second cover is fixed to the main body at an end on the second opening side and is more flexible than the first cover.   The trocar according to claim 1, wherein when the cover is slid to the second opening side, a part of the second cover protrudes outward.

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