EP2280658A1 - Procédé et dispositif de production de derme - Google Patents

Procédé et dispositif de production de derme

Info

Publication number
EP2280658A1
EP2280658A1 EP08749494A EP08749494A EP2280658A1 EP 2280658 A1 EP2280658 A1 EP 2280658A1 EP 08749494 A EP08749494 A EP 08749494A EP 08749494 A EP08749494 A EP 08749494A EP 2280658 A1 EP2280658 A1 EP 2280658A1
Authority
EP
European Patent Office
Prior art keywords
plate
cutis
piece
dermis
tissue
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP08749494A
Other languages
German (de)
English (en)
Inventor
Peter Iwatschenko
Hans Gärtner
Arnd Wilhelmi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tutogen Medical GmbH
Original Assignee
Tutogen Medical GmbH
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.)
Filing date
Publication date
Application filed by Tutogen Medical GmbH filed Critical Tutogen Medical GmbH
Publication of EP2280658A1 publication Critical patent/EP2280658A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/32—Surgical cutting instruments
    • A61B17/322—Skin grafting apparatus
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/32—Surgical cutting instruments
    • A61B17/322—Skin grafting apparatus
    • A61B2017/3225—Skin grafting apparatus with processing of harvested tissue

Definitions

  • the invention relates to a method and an apparatus for producing dermis as a transplant.
  • the transplant is usually referred to as a tissue or organ to be transplanted.
  • the dermis (dermis) is a layer of the more extensive organ “cutis” (cutis), which are used in connection with vertebrates and in particular in connection with human skin, whereby the skin is usually roughly divided into three layers, the epidermis (epidermis). Epidermis), the dermis (dermis, corium), and the subcutis (subcutis)
  • the skin obtained from, for example, a donor must be rid of the subcutis Fat, nerves, blood vessels, connective tissue strands etc.
  • the upper skin layer, the epidermis, is delimited by the stratum basale from the underlying dermis (dermis, corium).
  • the dermis is dominated by connective tissue cells (fibroblasts), which form an extracellular matrix (ECM).
  • fibroblasts connective tissue cells
  • Their main components are fiber proteins (collagens).
  • two layers are usually distinguished, namely the reticular dermis (stratum reticulare) facing the subcutis and the papillary dermis (stratum papillae) facing the epidermis.
  • cutis-derived transplants whereby both human beings and suitable animals are considered as donors, for example pigs. Cutis is removed from such tissue dispensers, processed by chemical processes and sterilized. Such grafts are used, for example, for the therapy of larger abdominal wall defects, especially in incisional hernias.
  • the collagen structure of the implant implanted in this way serves the body as a guide rail for building new endogenous tissue.
  • the degradation process of the implant and the formation of the body's own connective tissue run parallel, so that after a few weeks the soft tissue defect is closed by a scar.
  • plastic networks are implanted, which should cover the defect at the hernia.
  • a disadvantage of such plastic nets is their encapsulation and the subsequently required further operation.
  • Prepared dermis which is to be used as a transplant for the treatment of in particular soft tissue defects in the patient, is previously subjected to an inactivation method in order to avoid undesired complications (infections, transplant rejection).
  • the known inactivation methods include steps for inactivating microorganisms, viruses, prions and cells of the tissue donor. This ensures optimal compatibility and safety of the implant.
  • the prior art knows the so-called Tutoplastmaschine for the above-mentioned inactivation and preservation for the production of a ready-to-use, sterile graft.
  • This Tutoplastmaschine sets the present invention as known and also applicable here. In particular, it involves the following steps in the preparation of a transplant from Cutis:
  • the dry product must first be rehydrated with physiological saline solution on site and returned to a state as before the solvent preservation.
  • the cutis of the donor for example, the human donor
  • the papillary dermis adhere to large amounts of adipose tissue (subcutis), which must be removed very carefully in the prior art so as not to damage the tissue structure.
  • the lack of dimensional stability of the dermis section causes difficulties.
  • the piece of skin can be held very poorly when the scalpel is used to remove the fatty tissue.
  • a very experienced taxidermist needs about 20 minutes. It is based on the cut at the border between the stratum reticulare and the Unterhautfettgewebe (the adipose fat).
  • the dry dermis preserved by the Tutoplast procedure must be rehydrated before it can be used in a patient.
  • an inhomogeneous and tissue-dependent swelling behavior occurs, so that the thickness (thickness) of the resulting product then hardly predictably develops in the wet state compared to the (dry) initial state.
  • the invention has for its object to provide a method and apparatus for producing dermal graft, with a user (surgeons) a uniform graft strength can be provided.
  • the invention teaches a method for producing a dermis graft of a predetermined strength, in which
  • a) a piece of cutis is placed on a plate, b) the piece of cutis is brought into contact with the plate such that a mechanical removal of material is made possible on the side of the cutis facing away from the plate, and c) by means of a tool on the said Page material is removed from the cutis.
  • the invention thus includes the mechanical processing of the cutis in the wet, ie raw state to a desired thickness (thickness) and the subsequent application z.
  • the Tutoplast process for preservation as described above.
  • the tissue shrinks in the Tutoplast procedure (as described above)
  • the tissue regains its strength which it obtained after carrying out the method according to the invention using the device according to the invention.
  • the invention makes it possible to provide the user (surgeon) with a graft having a well-defined strength upon rehydration at the site of use, such that when using multiple graft pieces, the surgeon can only insert pieces after rehydration, for example , ie when used on the patient, have the same strength.
  • the processing of a piece of cutis obtained from a donor takes place in the hydrated state of the tissue.
  • the piece of tissue to be processed, Cutis is essentially connected over the whole area to a plate and then, on the side facing away from the plate, is machined mechanically to remove components which are undesirable for the transplant.
  • the connection of the piece Cutis with said plate is over the entire surface so that the said mechanical processing is possible without distortions of the cutis.
  • a particularly elegant connection of the piece to be processed Cutis with said plate is made possible in the wet state of the cutis by a freezing technique.
  • the plate is brought to a temperature at which the cutis freezes sufficiently firmly on the plate in order to enable the subsequent mechanical processing, for example, preferably with a milling cutter.
  • the preparation technique according to the invention can also be referred to as "machining.”
  • the freezing of the cutis to be processed on the plate can be promoted, for example, by applying the plate and / or the material to be applied to the plate papillary side of the cutis are moistened with a freezing liquid, for example water.
  • the inventive device for producing dermis graft of a predetermined strength is provided with
  • the device has means for Abküh ⁇ len said plate, so that a piece to be processed cutis adheres sufficiently firmly to the plate and has a sufficiently strong structure to the mechanical processing, for example with a milling cutter, too enable.
  • a milling cutter is used as a tool for mechanical machining, but in general another tool having cutting means can also be used, in particular a rotating tool with cutting means.
  • a heat sink is used according to a preferred embodiment of the invention, to which the plate is removably applied. This allows easy replacement of the plate in the apparatus for cleaning and sterilizing the plate. It can then be used successively with one and the same device, a plurality of plates.
  • the tool used for example the milling cutter
  • the tool used may be mountable in the device such that, like the plate, it is interchangeably mountable in the device from one piece of cutis to the next piece of cutis, while cleaning and sterilizing unused tools (milling) can be.
  • the variants of the invention described above allow very fast fixation of the tissue to be treated by freezing on a smooth plate. In this sufficiently frozen state of the tissue in particular subdermal adipose tissue can be removed quickly and effectively. Furthermore, irregularities on the reticular side of the dermis can be neatly leveled and the thickness of the dermis can be reduced to exactly the desired level. Even after a subsequent drying, for example by means of the above-described Tutoplast method, and then carried out by the onset of the surgeon rehydration then the graft has exactly the obtained after processing according to the invention strength, the z. B. can be indicated on the packaging of the usually dry delivered graft.
  • the invention allows a considerable saving of time in the manufacture of the graft and also a very considerable improvement in terms of graft quality and reproducibility of the production results.
  • FIG. 1 shows schematically an exemplary embodiment of a device for producing a dermis graft.
  • FIG. 2 shows the device according to FIG. 1 in plan view.
  • the aim of processing a i5 piece of cutis from a donor to be performed with the device according to the figure is the production of a human graft which has a predeterminable thickness in the wet state.
  • a piece of cutis as obtained from a donor as a starting material may have a thickness in the range of 4 to 7 mm, and after performing the method by means of a device according to the figure, the 2o graft should then have a thickness of, for example, Range from 3 to 4 mm.
  • the starting material ie the piece of Cutis
  • the device shown in the figure has a base plate 10 which serves to support the essential components of the device.
  • the figure shows a side view, partly in section, of essential components of the device.
  • bearing blocks 12 for example, two bearing blocks
  • the axis of rotation is provided with the reference numeral 16.
  • the figure shows the state of the device with closed upper housing part 14.
  • the upper housing part 14 can be opened in the figure counterclockwise about the axis of rotation 16.
  • Locking blocks 18 serve to lock the upper housing part 14 in the closed state in which the further processing of the cutis described below takes place.
  • In this closed state covers the upper housing part (which is partially broken away in the figure) on all sides of the cutis to be machined and the resulting ablated Tissue pieces off, so that no accumulating in the process tissue parts can escape uncontrollably to the outside.
  • the housing top may optionally be provided with a transparent window so that a user can visually follow the machining process.
  • a plate 20 is supported via a plurality of support pins 22, 24 (only two shown) above the base plate 10.
  • the plate 20 In the closed state of the upper housing part 14 hold down press 26, 28, the plate 20 on a heat sink 32 such that a good thermal contact between the heat sink 32 and the plate 20 is made.
  • Cutis 30 On the plate 20 to be processed piece Cutis 30 is placed over the entire surface, with any air or the like are struck.
  • the cutis has an upper surface 30a corresponding to the subcutis, i. on the upper side 30a of the cutis 30, the removal of tissue (for example fat, etc.) should take place.
  • tissue for example fat, etc.
  • the heat sink 32 has an inlet 34 for a cooling medium and an outlet 36 for the cooling medium. Between the heat sink 30 and the base plate 10 is an insulating plate 38, so that cooling effect is not unnecessarily exerted on the base plate 10, but the cooling extends substantially to the plate 20.
  • a temperature sensor (not shown) may be mounted to control the temperature of the plate 20.
  • the temperature sensor is provided with a control for the heat sink 32. If the cooling of the heat sink 32 in the manner described above by flow of a cold medium through the inlet 34 and the outlet 36, then the controller controls the temperature of the medium in the manner of a control loop as a function of the measured temperature of the plate 20.
  • cooling media For example, liquid carbon dioxide, nitrogen, etc. come into consideration in the variant shown in the figure.
  • thermoelectric heat sink 32 which is cooled by a flowing cooling medium
  • other cooling techniques can be used, for example, solid-state cooling techniques (so-called Peltier element).
  • Peltier element solid-state cooling techniques
  • the temperature to be set on the plate 20 is located as needed in the range of 0 ° C to -50 0 C.
  • the device has a milling cutter 40, which is guided over the upper side 30a of the piece Cutis 30 in such a way that the desired tissue removal takes place.
  • the milling cutter 40 can therefore be guided in tracks over the surface 30a of the cutis 30.
  • the guidance can be done manually, whereby the user visually (through said window) tracks the progress of the tissue removal and then stops the procedure when the visible surface of the cutis has reached a desired structure.
  • the guidance and control of the milling cutter 40 can also be carried out by machine in such a way that the user can input a definable final thickness of the cutis via a computer and the milling cutter then processes the cutis in accordance with a predetermined, optionally multi-layer removal program.
  • a device for measuring the thickness of the cutis 30 can be provided, for example an optical measuring device with the surface of the plate 20 as the reference point.
  • the actual thickness of the cutis can be measured and correlated to a target thickness that should be at the end of the machining process and the computer (or the user) guides the mill 40 over the cutis 30 until it reaches all Make the desired target strength.
  • a cutter pin 42 carrying the milling cutter 40 can be adjusted via a height adjustment 44.
  • the cutter 40 is rotated by means of an electric motor 48.
  • a piece of cutis 30 to be processed is placed on a plate 20.
  • the plate 20 may be located outside the device shown in the figure. Any air pockets or liquid inclusions between the cutis and the plate are pushed out with a suitable scraper (not shown).
  • the heat sink 32 is brought to the desired temperature. Then the plate 20 is placed with the full-surface piece lying on the heat sink 32 and the upper housing part 14 is folded into the closed state shown in the figure. The upper housing part 14 is secured by means of the locking blocks 18 via bolts (not shown) in the closed position.
  • the hold-down device 26 are thereby pressed onto the plate 20, so that the plate 20 over the entire surface fed on the heat sink 32nd is applied and its temperature assumes. If the piece Cutis 30 has the desired temperature, the machining process can be started. In this case, the cutter can, if thicker layers of fatty tissue etc. are to be removed from the cutis, be lowered in several stages in height to remove layer by layer.
  • Figure 2 shows the device described above in plan view, wherein the web 50 of the cutter meandering is guided over the cutis to be processed.
  • a window 52 allows visual monitoring of the process.
  • a handle 54 allows handling of the device.
  • the device described with reference to the figure can be supplemented with, in particular, an aspirator which sucks off material removed under vacuum as soon as it is removed from the cutter 40 by the cutis.
  • an aspirator which sucks off material removed under vacuum as soon as it is removed from the cutter 40 by the cutis.
  • a "chip pan" may also be provided.
  • the thus-prepared dermis implant can be removed after completion of the process of the plate 20 and then z.
  • the graft then shrinks but regains its original shape and thickness on subsequent rehydration.

Landscapes

  • Health & Medical Sciences (AREA)
  • Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Molecular Biology (AREA)
  • Transplantation (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Plastic & Reconstructive Surgery (AREA)
  • Medical Informatics (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Surgical Instruments (AREA)

Abstract

L'invention concerne un procédé et un dispositif de production d'un implant dermique d'une épaisseur prédéfinie, procédé consistant à placer un morceau de peau (30) sur une plaque (20). Au moyen d'une fraise (40), la matière hypodermique est retirée jusqu'à ce que la peau présente une épaisseur voulue.
EP08749494A 2008-05-21 2008-05-21 Procédé et dispositif de production de derme Withdrawn EP2280658A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2008/004091 WO2009140980A1 (fr) 2008-05-21 2008-05-21 Procédé et dispositif de production de derme

Publications (1)

Publication Number Publication Date
EP2280658A1 true EP2280658A1 (fr) 2011-02-09

Family

ID=40364389

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08749494A Withdrawn EP2280658A1 (fr) 2008-05-21 2008-05-21 Procédé et dispositif de production de derme

Country Status (3)

Country Link
US (1) US20110177591A1 (fr)
EP (1) EP2280658A1 (fr)
WO (1) WO2009140980A1 (fr)

Families Citing this family (25)

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US8900181B2 (en) 2009-12-18 2014-12-02 Srgi Holdings, Llc Skin treatment and drug delivery device
US11000310B2 (en) 2010-12-17 2021-05-11 Srgi Holdings, Llc Pixel array medical systems, devices and methods
US10368904B2 (en) 2013-12-06 2019-08-06 Srgi Holdings, Llc Pixel array medical systems, devices and methods
US11612410B2 (en) 2010-12-17 2023-03-28 Srgi Holdings, Llc Pixel array medical systems, devices and methods
US11103275B2 (en) 2010-12-17 2021-08-31 Srgi Holdings, Llc Pixel array medical systems, devices and methods
US20160317170A1 (en) 2013-12-06 2016-11-03 Edward KNOWLTON Pixel array medical systems, devices and methods
US10661063B2 (en) 2010-12-17 2020-05-26 Srgi Holdings, Llc Systems, devices and methods for fractional resection, fractional skin grafting, fractional scar reduction and fractional tattoo removal
US10702684B2 (en) 2010-12-17 2020-07-07 Srgi Holdings, Llc Systems, devices and methods for fractional resection, fractional skin grafting, fractional scar reduction and fractional tattoo removal
US10695546B2 (en) 2010-12-17 2020-06-30 Srgi Holdings, Llc Systems, devices and methods for fractional resection, fractional skin grafting, fractional scar reduction and fractional tattoo removal
US11278309B2 (en) 2010-12-17 2022-03-22 Srgi Holdings, Llc Pixel array medical systems, devices and methods
US10736653B2 (en) 2013-12-06 2020-08-11 Srgi Holdings, Llc Pixel array medical systems, devices and methods
DE102011008604A1 (de) 2011-01-14 2012-07-19 Tutogen Medical Gmbh Herstellung eines Transplantats aus tierischer Dermis mit Natriumsulfidlösung
DE102013008969A1 (de) 2013-05-21 2014-11-27 Ludwig Baumgartner Verwendung eines isolierten kollagenhaltigen Flächengebildes zur Herstellung einer flächigen Adhäsionsbarriere
ES2827049T3 (es) 2013-10-02 2021-05-19 Srgi Holdings Llc Dispositivos médicos de conjunto de píxeles
SG11201602636PA (en) 2013-10-02 2016-05-30 Srgi Holdings Llc Pixel array medical devices and methods
US11937846B2 (en) 2013-12-06 2024-03-26 Srgi Holdings Llc Pixel array medical systems, devices and methods
US11229452B2 (en) 2013-12-06 2022-01-25 Srgi Holdings, Llc Pixel array medical systems, devices and methods
EP3091916A1 (fr) 2014-01-10 2016-11-16 Lifecell Corporation Appareil d'abrasion de tissu doté d'une plaque à vide
US10123819B2 (en) 2015-04-14 2018-11-13 Zimmer Surgical, Inc. Multi-piece dermatome body
US11490952B2 (en) 2015-08-31 2022-11-08 Srgi Holdings, Llc Pixel array medical devices and methods
US11751904B2 (en) 2015-08-31 2023-09-12 Srgi Holdings, Llc Pixel array medical systems, devices and methods
US11564706B2 (en) 2019-10-28 2023-01-31 Srgi Holdings, Llc Pixel array medical systems, devices and methods
US10537349B1 (en) 2016-02-08 2020-01-21 Lifecell Corporation Method for processing tissue to control thickness
WO2020086915A2 (fr) 2017-05-03 2020-04-30 Srgi Holdings Llc Réseau de scalpels à fentes en spirale à main
WO2019241780A2 (fr) * 2018-06-16 2019-12-19 Srgi Holdings Llc Systèmes, dispositifs et procédés médicaux de réseaux de pixels

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US4752347A (en) * 1986-10-03 1988-06-21 Rada David C Apparatus for preparing tissue sections
US6041686A (en) * 1996-11-01 2000-03-28 Leica Mikrosysteme Aktiengesellschaft Microtome having an oscillating blade

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US3872759A (en) * 1973-03-12 1975-03-25 Kent Cambridge Medical Ltd Microtomes
DE9403937U1 (de) * 1994-03-09 1994-08-11 Jaeger H Dipl Ing Gerät zur subepidermalen Ausdünnung der Haut
DE29722914U1 (de) * 1997-12-29 1998-02-12 Siegert Ralf Dr Dr Med Hautausdünnungsgerät
DE19958855C2 (de) * 1999-12-07 2003-07-03 Klaus Kasten Handgerät zur Präparation eines Vollhaut-Transplantats durch Abtragen von Hautgewebeschichten
DE10152152B4 (de) * 2001-10-25 2004-02-26 Carl Zeiss Meditec Ag Schneidvorrichtung

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US4752347A (en) * 1986-10-03 1988-06-21 Rada David C Apparatus for preparing tissue sections
US6041686A (en) * 1996-11-01 2000-03-28 Leica Mikrosysteme Aktiengesellschaft Microtome having an oscillating blade

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Title
See also references of WO2009140980A1 *

Also Published As

Publication number Publication date
US20110177591A1 (en) 2011-07-21
WO2009140980A1 (fr) 2009-11-26

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