WO2016144115A1 - Variable diameter protector assembly for minimally invasive surgery - Google Patents

Variable diameter protector assembly for minimally invasive surgery Download PDF

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Publication number
WO2016144115A1
WO2016144115A1 PCT/KR2016/002401 KR2016002401W WO2016144115A1 WO 2016144115 A1 WO2016144115 A1 WO 2016144115A1 KR 2016002401 W KR2016002401 W KR 2016002401W WO 2016144115 A1 WO2016144115 A1 WO 2016144115A1
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WO
WIPO (PCT)
Prior art keywords
rib
ribs
plurality
surface
cylindrical shape
Prior art date
Application number
PCT/KR2016/002401
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French (fr)
Korean (ko)
Inventor
허동화
윤홍원
김현성
Original Assignee
주식회사 앤트테크놀로지
주식회사 메드릭스
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority to KR10-2015-0033193 priority Critical
Priority to KR1020150033193A priority patent/KR101662788B1/en
Application filed by 주식회사 앤트테크놀로지, 주식회사 메드릭스 filed Critical 주식회사 앤트테크놀로지
Publication of WO2016144115A1 publication Critical patent/WO2016144115A1/en

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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/02Surgical instruments, devices or methods, e.g. tourniquets for holding wounds open; Tractors

Abstract

The present invention relates to a variable diameter protector assembly for minimally invasive surgery that comprises: a plurality of ribs having the shape of a flat plate with a specified width and a specified length; and retractable joint members, each of which interconnects one of the plurality of ribs and a rib adjacent thereto, wherein the plurality of ribs form a cylindrical shape having a channel formed therein by virtue of the repetition of a pattern in which the edge of one rib and the edge of the adjacent rib overlap each other, the plurality of ribs, which form the cylindrical shape, are inserted through an opening of a person that undergoes a surgical procedure, and the inner diameter of the cylindrical shape varies according to the extension and retraction of the joint member. As such, the variable diameter protector assembly varies the inner diameter thereof for applications to various surgical sites, thereby making a stable and accurate surgical procedure possible.

Description

Minimally invasive protector assembly with variable diameter

The present invention relates to a protector assembly for a minimally invasive surgical procedure of varying diameters, and more particularly, to a minimum invasive surgical protector having a variable diameter to allow a stable and reliable operation by varying the inner diameter to be applicable to various surgical sites It is about assembly.

The discs between the vertebrae and the bones function as joints, and as the spine moves, the position and shape of the nucleus pulposus inside the disc changes, which plays a very important role in minimizing the impact on the spine.

Most of the nucleus of the nucleus is composed of water (water). As the body ages, the amount of water gradually decreases, and the disk loses its buffer function.

Due to this, excessive pressure is applied to the fiber, which causes back pain, and further progresses, when the fiber is severely stretched or ruptured, pressing the nerve root located at the back causes pain in the pelvis and legs.

Since the spine is gradually narrowed or spine deformed as the vertebral bones settle down, various side effects occur.

As a method of treating the disease accompanying the disc, there is a method of removing the damaged intervertebral disc and replacing the space between two adjacent vertebrae with a prosthesis, a so-called cage.

That is, the prosthesis is to restore the vertebral function by restoring the original distance between two adjacent vertebral bodies, the original height of the intervertebral disc.

As a surgical method for inserting such a prosthesis between the vertebrae, an anterior lumbar interbody fusion (ALIF) that opens the abdomen and inserts the prosthesis in front of the spine, a latent lumbar interbody fusion (LLIF) that inserts the prosthesis through the flanks, etc. Transforaminal Lumbar Interbody Fusion (TLIF) inserts the prosthesis diagonally at a distance of 30 to 40 mm from the center to the back, and Interior Lumbar Interbody Fusion (PLIF) inserts the prosthesis from the back.

Referring to the conventional TLIF treatment method, one side of the prosthetic member is first inserted diagonally through the dorsal side of the human body and positioned between the vertebrae, and then the insertion of the prosthetic member is completed by placing the front side of the inserted prosthetic member toward the abdomen of the human body. do.

At this time, in the case of the conventional TLIF treatment method, the position of the prosthetic member is easily influenced by the operator's skill, and there is a problem that the prosthetic member is not easily positioned between the vertebrae, and the prosthetic member is not accurately positioned between the vertebrae. If not, there is also a problem that the surgical effect falls.

Invented from the above point of view, such as "less invasive surgical system and method" (hereinafter, 'prior art') of the Patent Publication No. 10-2007-0109977.

However, this prior art requires a sequential insertion of multiple dilators through the openings formed in the patient's body to secure the diameter as needed for the procedure. have.

Therefore, it is possible to insert a cage or a disc into the patient's body without having to insert a plurality of expanders with a minimum of minimum diameters. There is an urgent need to develop a technique that does not damage the muscles of the patient due to the insertion of the dilator.

The present invention has been invented to improve the above problems, and to provide a protector assembly for a minimally invasive procedure variable in diameter to enable a stable and reliable procedure by varying the inner diameter to be applicable to various treatment sites. .

In order to achieve the above object, the present invention is a plurality of ribs having a flat plate shape having a predetermined width and a predetermined length; And a flexible joint member interconnecting one rib of the plurality of ribs to a neighboring rib, wherein the plurality of ribs have a pattern in which an edge of the one rib and an edge of the neighboring rib overlap each other. Repeatedly formed in a cylindrical shape having a channel formed entirely therein, the plurality of ribs formed in the cylindrical shape is inserted through the opening of the operator, the inner diameter of the cylindrical member is It is possible to provide a protector assembly for a minimally invasive procedure of varying diameter, characterized in that it varies according to stretch.

Here, the joint member is characterized in that it is made of a combination of at least one or more of a strap, a band having a predetermined width and length, stretchable and elastic deformation.

At this time, an edge of the one rib is a portion of a surface of the one rib forming the outer peripheral surface of the cylindrical shape among the plurality of ribs formed in the cylindrical shape, and the edge of the adjacent rib is the cylindrical shape. The joint member may be disposed in an overlapping region formed by a portion of the rear surface of the neighboring rib forming an inner circumferential surface and overlapping the surface portion and the portion of the rear surface facing each other.

And, both ends of the joint member is characterized in that coupled to each of the surface portion and the portion of the back surface.

And the edge of the said one rib is a part of the surface of the said rib which forms the outer peripheral surface of the said cylindrical shape among the said ribs formed in the said cylindrical shape, The edge of the said adjacent rib is the said cylindrical shape The joint member is a portion of the rear surface of the neighboring ribs forming an inner circumferential surface, and the joint member is disposed outside the overlapping region formed by the portion of the surface facing each other and the portion of the rear surface.

One end of the joint member is coupled to an edge end of the one rib, and the other end of the joint member is coupled to a rear surface of the neighboring rib.

In addition, the protector assembly for the minimally invasive procedure variable in diameter, the first stepped portion formed recessed in the longitudinal direction on the rear surface of the one of the plurality of ribs formed in the cylindrical shape and the neighboring ribs; And a second stepped portion recessed in the longitudinal direction on the surface of the one rib and the adjacent rib, wherein the second stepped portion of the one rib and the first stepped portion of the neighboring rib are engaged with each other. As the inner diameter is extended, both ends of the joint member are coupled to the second stepped portion and the rear surface of the adjacent rib, respectively.

In addition, the protector assembly for the minimally invasive surgical procedure of variable diameter further comprises an alignment cap detachably coupled from the other end of each of the plurality of ribs opposite to one end of each of the plurality of ribs inserted through the opening, The alignment cap surrounds a portion of the cylindrical outer surface, and the alignment cap is separated from the plurality of ribs through which the plurality of ribs are inserted through the opening.

According to the present invention having the above configuration, the following effects can be achieved.

First of all, the present invention allows a stable and reliable operation by varying an inner diameter so as to be applicable to various surgical sites from a structure including a plurality of ribs which are disposed to overlap each other to form an overall cylindrical shape and a joint member interconnecting the same. .

In addition, it is possible to minimize the damage to the muscles that may occur in the process of inserting a plurality of dilators sequentially through the opening formed in the body of the patient, and without using a plurality of dilators (cage ) And artificial discs can be inserted.

In particular, the present invention is possible to minimize or expand the inner diameter by extending or contracting the flexible joint member, so as to insert a surgical tool such as an impactor, as well as a device for visual confirmation during surgery such as endoscopy Since it is possible to add, it can be freed from space constraints during surgery.

In addition, the present invention is effective in that it is possible to implement a compact and lightweight in a relatively simple configuration to reduce the cost and waste of raw materials.

1 is a perspective view showing the overall structure of a protector assembly for a minimally invasive procedure variable in diameter according to an embodiment of the present invention, a view showing a state in which the inner diameter is the minimum

Figure 2 is a plan conceptual view showing the overall structure of the protector assembly for a minimally invasive procedure variable in diameter according to an embodiment of the present invention, a view showing a state of the inner diameter is the minimum

3 and 4 is an enlarged view of the portion A of FIG. 2, a conceptual diagram showing a state change according to the elongation or contraction of the joint member, which is a main part of the present invention, Figures 3 (a) and 4 (a) is an interior Figure 3 (b) and Figure 4 (b) is a state in which the diameter is the minimum, respectively showing the state of the maximum internal diameter

5 and 6 is a plan conceptual view showing a state in which the inner diameter of the protector assembly for a minimally invasive procedure variable in diameter according to another embodiment of the present invention, Figure 5 is a state in which the inner diameter is minimum, Figure 6 Is a diagram showing a state in which the inner diameter is maximum, respectively

7 is a perspective view showing a procedure using the protector assembly for the minimally invasive procedure variable in diameter according to an embodiment of the present invention

Figure 8 is a perspective view showing another state of use of the protector assembly for a minimally invasive procedure variable in diameter in accordance with another embodiment of the present invention

Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings.

However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms.

In this specification, the embodiments are provided so that the disclosure of the present invention may be completed and the scope of the present invention may be completely provided to those skilled in the art.

And the present invention is only defined by the scope of the claims.

Thus, in some embodiments, well known components, well known operations and well known techniques are not described in detail in order to avoid obscuring the present invention.

In addition, the same reference numerals throughout the specification refer to the same components, and the terminology (discussed) used herein is for the purpose of describing the embodiments are not intended to limit the invention.

As used herein, the singular forms "a", "an" and "the" include plural unless the context clearly dictates otherwise, and the elements and acts referred to as 'comprises' or 'do' not exclude the presence or addition of one or more other components and acts. .

Unless otherwise defined, all terms (including technical and scientific terms) used in the present specification may be used in a sense that can be commonly understood by those skilled in the art.

In addition, the terms defined in the commonly used dictionary are not ideally or excessively interpreted unless they are defined.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention.

First, Figure 1 is a perspective view showing the overall structure of the protector assembly for a minimally invasive procedure variable in diameter according to an embodiment of the present invention, a view showing a state in which the inner diameter is the minimum.

And, Figure 2 is a plan conceptual view showing the overall structure of the protector assembly for a minimally invasive procedure variable in diameter according to an embodiment of the present invention, a view showing a state of the inner diameter is the minimum.

3 and 4 are enlarged views of part A of FIG. 2, and are conceptual views illustrating a state change according to extension or contraction of a joint member, which is a main part of the present invention. FIGS. 3 (a) and 4 (a). Is a state in which the inner diameter is the minimum, and FIG. 3 (b) and FIG. 4 (b) show the state in which the inner diameter is the maximum.

The protector assembly P according to the present invention includes a plurality of ribs 10 having a flat shape having a predetermined width and a predetermined length, and ribs adjacent to one of the plurality of ribs 10. It can be seen that the structure that includes a stretchable joint member 20 and interconnecting 10).

Here, the plurality of ribs 10 are formed in a cylindrical shape in which a pattern in which the edges of one rib 10 and the edges of adjacent ribs 10 overlap each other is repeated to form a channel therein as a whole. .

At this time, the plurality of ribs 10 formed in the cylindrical shape is inserted through the opening (41, opening (see Fig. 7)) of the subject, the inner diameter of the cylindrical shape is variable according to the expansion and contraction of the joint member (20).

Therefore, the protector assembly (P) is variable from the structure including a plurality of ribs 10 and the joint member 20 for interconnecting the ribs 10 disposed to overlap with each other to form an overall cylindrical shape, varying the internal diameter to be applicable to various surgical sites Stable and sure procedure is possible.

In particular, the protector assembly (P) can be operated to minimize or expand the inner diameter by stretching or contracting the flexible joint member 20, so that the minimum opening when inserting a cage or artificial disc, etc. The procedure can be performed by securing, and it is not necessary to insert a plurality of dilators sequentially, thereby minimizing muscle damage.

In addition, it is possible to insert a surgical tool such as an impactor (not shown), as well as to insert a device for visual confirmation during surgery such as an endoscope (hereinafter not shown), so as to be free from space constraints during surgery. do.

In addition, the protector assembly (P) is effective in that it is possible to implement a compact and lightweight in a relatively simple configuration to reduce the cost and waste of raw materials.

The present invention can be applied to the above embodiments, and of course, the following various embodiments are also applicable.

The joint member 20 may be made of a combination of at least one or more of a strap that is elastic and allows elastic deformation, a band having a predetermined width and length, and a film.

On the other hand, the edge of one rib 10 is a part of the surface of one rib 10 which forms the outer peripheral surface of cylindrical shape among the some rib 10 formed in the cylindrical shape.

And the edge of the adjacent rib 10 is a part of the back surface of the adjacent rib 10 which forms the cylindrical inner peripheral surface.

Therefore, referring to FIG. 2, it can be seen that the joint member 20 is disposed in the overlapping region V formed by a part of the surface and a part of the rear surface facing each other.

In other words, an embodiment of a structure in which both ends of the joint member 20 are coupled to a part of the surface and a part of the back surface may be applied.

That is, the joint member 20 disposed in the overlapping region V formed by a part of the surface and a part of the surface overlapping each other is usually maintained in a contracted state as shown in FIG. When the inner diameter is expanded by inserting it into one, as shown in FIG. 3 (b), one rib 10 and the adjacent rib 10 are arranged with their tails on the tail on an imaginary circumference of the entire cylindrical shape.

On the other hand, the protector assembly (P) is a first end formed stepped in the longitudinal direction on the back surface of one rib 10 and the adjacent rib 10 of the plurality of ribs 10 formed in a cylindrical shape as shown in FIG. It is a matter of course that the structure further includes a jaw portion 11, a second stepped portion 12 formed stepped along the longitudinal direction on the surface of one rib 10 and the adjacent rib 10, of course.

Here, the second stepped part 12 of one rib 10 and the first stepped part 11 of the adjacent rib 10 are engaged with each other, as shown in Fig. 4 (b) in the state of Fig. 4 (a). The inner diameter is expanded by arranging the tail on the imaginary circumference of the entire cylindrical shape.

At this time, both ends of the joint member 20 may be coupled to the rear surface of the second stepped portion 12 and the adjacent rib 10, respectively.

Meanwhile, as shown in FIG. 5, the protector assembly P includes an overlapping region V formed by a portion of the surface and a portion of the rear surface facing each other while the rib 10 and the neighboring rib 10 are arranged to overlap each other. Of course, the embodiment of the structure in which the joint member 20 is disposed outside of may be applied.

Here, one end of the joint member 20 is coupled to the edge end of one rib 10, and the other end of the joint member 20 is coupled to the rear surface of the adjacent rib 10, thereby connecting the joint member 20. When expanded, the inner diameter D2 may be expanded as shown in FIG. 6 compared to the inner diameter D1 of FIG. 5.

On the other hand, the protector assembly (P) is opposite to the one end of each of the plurality of ribs 10 inserted through the opening 41 as shown in Figure 8 so as to provide convenience in the procedure as shown in Figure 7 It is preferable to further include an alignment cap 50 detachably coupled from the other end of each of the plurality of ribs 10.

Here, the alignment cap 50 surrounds a portion of a cylindrical shape formed by the plurality of ribs 10, and the alignment cap 50 includes a plurality of ribs 10 into which the plurality of ribs 10 are inserted through the opening 41. It is separated from the rib 10.

The method of using the protector assembly P according to the above embodiment will be described as follows with reference to FIGS. 1 to 6.

First, the operator sequentially inserts a plurality of dilators 30 having different diameters through openings 41 formed in the body of the subject, and removes some of the plurality of dilators 30 (S1: first). step). Preferably, the inner diameter dilator 31 is removed. This leaves only the large diameter expander 32.

In addition, the operator may connect the plurality of ribs 10 having a predetermined width and a predetermined length with the ribs 10 and one rib 10 of the plurality of ribs 10 and the adjacent ribs 10 to each other. Cylindrical shape in which the protector assembly P including the 20 is repeated with a pattern where the edges of one rib 10 and the edges of neighboring ribs 10 overlap each other to form a channel therein. It inserts through the opening 41 in the state formed (S2: 2nd step). Specifically, the protector assembly P is inserted into the remaining large diameter expander 32.

Thereafter, the operator removes the rest of the plurality of dilators 30 from the opening 41 (S3: third step).

Next, the operator expands the joint member 20 while the protector assembly P is inserted into the opening 41 and expands the inner diameter while separating the distance of each of the plurality of ribs 10 (S4). : Fourth step).

Here, referring to FIG. 7 again, the first step S1 may include inserting a first expander 31 having a first diameter into the opening 41 and a second having a second diameter larger than the first diameter. And inserting the inner circumferential surface of the dilator 32 into the opening 41 so as to face the outer circumferential surface of the first dilator 31, and removing the first dilator 31 from the second dilator 32.

At this time, the second step S2 is performed in a state where only the second expander 32 remains in the opening 41.

In addition, in the second step S2, before inserting the protector assembly P into the opening 41, a plurality of ribs opposite to one end of each of the plurality of ribs 10 inserted through the opening 41 are formed. 10) The work of attaching the detachable alignment cap 50 from each other end can further be performed.

Here, the alignment cap 50 is removed from the protector assembly P when the protector assembly P is inserted into the opening 41 before the third step S3 is performed.

In addition to the above method, only a plurality of dilators (for example, 1 to 4 dilators) are sequentially inserted in the diameter order into the protector assembly P while only the protector assembly P inserted into the opening 41 remains. Spinner surgery such as prosthetics and artificial discs may be performed through the internal through-holes of the dilator 4 while removing the dilators 1 to 3 and leaving only the 4 dilator having the largest diameter inside the protector assembly (P). In this case, unlike the above embodiment, it can be used to secure enough openings through the dilator. Also, since a plurality of dilators are inserted into the protector assembly P, the patient's muscles are not damaged. to be.

As described above, the present invention provides a minimally invasive protector assembly and a method of treatment using the same in which the diameter is varied to allow stable and reliable operation by varying the internal diameter so that it can be applied to various surgical sites. It can be seen that.

In addition, many modifications and applications are possible to those skilled in the art within the scope of the basic technical idea of the present invention.

Claims (8)

  1. A plurality of ribs having a flat shape having a predetermined width and a predetermined length; And
    A flexible joint member interconnecting one of the plurality of ribs with a neighboring rib,
    The plurality of ribs,
    The edges of the one rib and the edges of the adjacent ribs are repeated to form a cylindrical shape in which a channel is formed therein.
    The plurality of ribs formed in the cylindrical shape is inserted through the opening of the subject,
    The cylindrical inner diameter of the protector assembly for a variable diameter minimally invasive procedure, characterized in that the variable according to the expansion and contraction of the joint member.
  2. The method according to claim 1,
    The joint member,
    A flexible invasive protector assembly for varying diameters, characterized in that it consists of a strap that allows elastic deformation, a band having a predetermined width and length, and a film.
  3. The method according to claim 1,
    An edge of said one rib is a part of the surface of the said rib which forms the outer peripheral surface of the said cylindrical shape among the said ribs formed in the said cylindrical shape, The edge of the adjacent rib is the inner peripheral surface of the said cylindrical shape. The part of the back surface of the neighboring rib to be formed, the diameter of the minimally invasive protector assembly, characterized in that the joint member is disposed in the overlapping region formed by the portion of the surface and the surface overlapping each other.
  4. The method according to claim 3,
    Both ends of the joint member is coupled to the portion of the surface and the portion of the rear surface, respectively, the minimally invasive surgical protector assembly for a variable diameter.
  5. The method according to claim 1,
    An edge of said one rib is a part of the surface of the said rib which forms the outer peripheral surface of the said cylindrical shape among the said ribs formed in the said cylindrical shape, The edge of the adjacent rib is the inner peripheral surface of the said cylindrical shape. Minimally invasive protector having a variable diameter, characterized in that the coupling member is disposed outside the overlapping region formed by the portion of the surface and the portion of the surface overlapping each other and overlapping the adjacent ribs to form assembly.
  6. The method according to claim 5,
    One end of the joint member is coupled to the edge end of the one rib, the other end of the joint member is a minimally invasive protector assembly for a variable diameter, characterized in that coupled to the back of the neighboring rib.
  7. The method according to claim 1,
    The minimally invasive protector assembly is variable in diameter,
    A first stepped portion formed stepped in a longitudinal direction on the rear surface of the one rib and the neighboring rib among the plurality of ribs formed in the cylindrical shape;
    Further comprising a second stepped portion recessed in the longitudinal direction on the surface of the one rib and the neighboring ribs,
    The inner diameter is extended by engaging the second stepped portion of the one rib and the first stepped portion of the neighboring rib,
    Both ends of the joint member is coupled to the second stepped portion and the back surface of the adjacent rib, respectively, characterized in that the diameter of the minimally invasive protector assembly.
  8. The method according to claim 1,
    The minimally invasive protector assembly is variable in diameter,
    And an alignment cap detachably coupled from the other end of each of the plurality of ribs opposite to one end of each of the plurality of ribs inserted through the opening,
    The alignment cap surrounds a portion of the outer surface of the cylindrical shape,
    And said alignment cap is separated from said plurality of ribs through which said plurality of ribs are inserted through said opening.
PCT/KR2016/002401 2015-03-10 2016-03-10 Variable diameter protector assembly for minimally invasive surgery WO2016144115A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR10-2015-0033193 2015-03-10
KR1020150033193A KR101662788B1 (en) 2015-03-10 2015-03-10 Variable diameter protector assembly for minimal invasive surgery

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017040774A1 (en) * 2015-09-03 2017-03-09 St. Jude Medical, Cardiology Division, Inc. Introducer sheath having expandable portions

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JP2001527437A (en) * 1997-03-07 2001-12-25 グローバーマン、オレン System for percutaneous bone and spinal stabilization, fixation and repair
US7153261B2 (en) * 2003-04-25 2006-12-26 Tyco Healthcare Group Lp Surgical hand access apparatus
JP2007069003A (en) * 2005-09-06 2007-03-22 Tyco Healthcare Group Lp Instrument introducer
US7988624B2 (en) * 2002-04-05 2011-08-02 Warsaw Orthopedic, Inc. Devices and methods for percutaneous tissue retraction and surgery
JP2012110678A (en) * 2010-11-23 2012-06-14 Tyco Healthcare Group Lp Reinforced flexible access assembly

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US7666189B2 (en) 2004-09-29 2010-02-23 Synthes Usa, Llc Less invasive surgical system and methods

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Publication number Priority date Publication date Assignee Title
JP2001527437A (en) * 1997-03-07 2001-12-25 グローバーマン、オレン System for percutaneous bone and spinal stabilization, fixation and repair
US7988624B2 (en) * 2002-04-05 2011-08-02 Warsaw Orthopedic, Inc. Devices and methods for percutaneous tissue retraction and surgery
US7153261B2 (en) * 2003-04-25 2006-12-26 Tyco Healthcare Group Lp Surgical hand access apparatus
JP2007069003A (en) * 2005-09-06 2007-03-22 Tyco Healthcare Group Lp Instrument introducer
JP2012110678A (en) * 2010-11-23 2012-06-14 Tyco Healthcare Group Lp Reinforced flexible access assembly

Cited By (1)

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Publication number Priority date Publication date Assignee Title
WO2017040774A1 (en) * 2015-09-03 2017-03-09 St. Jude Medical, Cardiology Division, Inc. Introducer sheath having expandable portions

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KR101662788B1 (en) 2016-10-05
KR20160109196A (en) 2016-09-21

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