WO2005094682A1 - Method and apparatus for electrical stimulation to enhance lancing device performance - Google Patents
Method and apparatus for electrical stimulation to enhance lancing device performance Download PDFInfo
- Publication number
- WO2005094682A1 WO2005094682A1 PCT/EP2005/002155 EP2005002155W WO2005094682A1 WO 2005094682 A1 WO2005094682 A1 WO 2005094682A1 EP 2005002155 W EP2005002155 W EP 2005002155W WO 2005094682 A1 WO2005094682 A1 WO 2005094682A1
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- WO
- WIPO (PCT)
- Prior art keywords
- site
- skin
- electrical energy
- bodily fluid
- engorgement
- Prior art date
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/18—Applying electric currents by contact electrodes
- A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
- A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
- A61N1/36014—External stimulators, e.g. with patch electrodes
- A61N1/36021—External stimulators, e.g. with patch electrodes for treatment of pain
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/150007—Details
- A61B5/150015—Source of blood
- A61B5/150022—Source of blood for capillary blood or interstitial fluid
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/150007—Details
- A61B5/150053—Details for enhanced collection of blood or interstitial fluid at the sample site, e.g. by applying compression, heat, vibration, ultrasound, suction or vacuum to tissue; for reduction of pain or discomfort; Skin piercing elements, e.g. blades, needles, lancets or canulas, with adjustable piercing speed
- A61B5/150061—Means for enhancing collection
- A61B5/150091—Means for enhancing collection by electricity
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/150007—Details
- A61B5/150053—Details for enhanced collection of blood or interstitial fluid at the sample site, e.g. by applying compression, heat, vibration, ultrasound, suction or vacuum to tissue; for reduction of pain or discomfort; Skin piercing elements, e.g. blades, needles, lancets or canulas, with adjustable piercing speed
- A61B5/150106—Means for reducing pain or discomfort applied before puncturing; desensitising the skin at the location where body is to be pierced
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/150007—Details
- A61B5/150374—Details of piercing elements or protective means for preventing accidental injuries by such piercing elements
- A61B5/150381—Design of piercing elements
- A61B5/150412—Pointed piercing elements, e.g. needles, lancets for piercing the skin
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/150007—Details
- A61B5/150374—Details of piercing elements or protective means for preventing accidental injuries by such piercing elements
- A61B5/150381—Design of piercing elements
- A61B5/150503—Single-ended needles
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/151—Devices specially adapted for taking samples of capillary blood, e.g. by lancets, needles or blades
- A61B5/15101—Details
- A61B5/15103—Piercing procedure
- A61B5/15107—Piercing being assisted by a triggering mechanism
- A61B5/15113—Manually triggered, i.e. the triggering requires a deliberate action by the user such as pressing a drive button
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/151—Devices specially adapted for taking samples of capillary blood, e.g. by lancets, needles or blades
- A61B5/15101—Details
- A61B5/15115—Driving means for propelling the piercing element to pierce the skin, e.g. comprising mechanisms based on shape memory alloys, magnetism, solenoids, piezoelectric effect, biased elements, resilient elements, vacuum or compressed fluids
- A61B5/15117—Driving means for propelling the piercing element to pierce the skin, e.g. comprising mechanisms based on shape memory alloys, magnetism, solenoids, piezoelectric effect, biased elements, resilient elements, vacuum or compressed fluids comprising biased elements, resilient elements or a spring, e.g. a helical spring, leaf spring, or elastic strap
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/151—Devices specially adapted for taking samples of capillary blood, e.g. by lancets, needles or blades
- A61B5/15101—Details
- A61B5/15115—Driving means for propelling the piercing element to pierce the skin, e.g. comprising mechanisms based on shape memory alloys, magnetism, solenoids, piezoelectric effect, biased elements, resilient elements, vacuum or compressed fluids
- A61B5/15121—Driving means for propelling the piercing element to pierce the skin, e.g. comprising mechanisms based on shape memory alloys, magnetism, solenoids, piezoelectric effect, biased elements, resilient elements, vacuum or compressed fluids comprising piezos
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/151—Devices specially adapted for taking samples of capillary blood, e.g. by lancets, needles or blades
- A61B5/15101—Details
- A61B5/15115—Driving means for propelling the piercing element to pierce the skin, e.g. comprising mechanisms based on shape memory alloys, magnetism, solenoids, piezoelectric effect, biased elements, resilient elements, vacuum or compressed fluids
- A61B5/15123—Driving means for propelling the piercing element to pierce the skin, e.g. comprising mechanisms based on shape memory alloys, magnetism, solenoids, piezoelectric effect, biased elements, resilient elements, vacuum or compressed fluids comprising magnets or solenoids
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/151—Devices specially adapted for taking samples of capillary blood, e.g. by lancets, needles or blades
- A61B5/15101—Details
- A61B5/15115—Driving means for propelling the piercing element to pierce the skin, e.g. comprising mechanisms based on shape memory alloys, magnetism, solenoids, piezoelectric effect, biased elements, resilient elements, vacuum or compressed fluids
- A61B5/15125—Driving means for propelling the piercing element to pierce the skin, e.g. comprising mechanisms based on shape memory alloys, magnetism, solenoids, piezoelectric effect, biased elements, resilient elements, vacuum or compressed fluids comprising a vacuum or compressed fluids
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/151—Devices specially adapted for taking samples of capillary blood, e.g. by lancets, needles or blades
- A61B5/15186—Devices loaded with a single lancet, i.e. a single lancet with or without a casing is loaded into a reusable drive device and then discarded after use; drive devices reloadable for multiple use
- A61B5/15188—Constructional features of reusable driving devices
- A61B5/1519—Constructional features of reusable driving devices comprising driving means, e.g. a spring, for propelling the piercing unit
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/18—Applying electric currents by contact electrodes
- A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
- A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
- A61N1/372—Arrangements in connection with the implantation of stimulators
- A61N1/375—Constructional arrangements, e.g. casings
- A61N1/3756—Casings with electrodes thereon, e.g. leadless stimulators
Definitions
- the present invention relates to devices and methods for obtaining samples of blood and other fluids from the body for analysis or processing.
- a second area of effort focuses on stimulating increased presence of blood so that at least a minimum blood sample size is collected after lancing for accurate testing.
- the invention in one form, relates to a device for obtaining a sample of bodily fluid through the skin.
- the device comprises a housing and electrodes on the housing positioned to contact a site on the skin.
- An electrical signal generator applies electrical energy to the electrodes in sufficient quantity to stimulate the skin at the site to accomplish at least one of pain masking and bodily fluid engorgement at the site.
- a skin-lancing device mounted in the housing directs a skin-lancing medium against the skin at the site to form an incision therein subsequent to the application of electrical energy.
- the invention in another form, relates to a method obtaining a sample of bodily fluid through the skin.
- the method comprises applying electrical energy to a sampling site on the skin of sufficient quantity to stimulate the skin at the site to accomplish at least one of pain masking and bodily fluid engorgement at the site. Subsequently, an incision is formed at the site to remove a sample of bodily fluid.
- Fig. 1 shows a highly schematic drawing showing the application of the present invention to a lancing device.
- Fig. 2 shows a perspective view of one set of electrodes and skin contacting end wall configuration for use in the lancing device of Fig. 1.
- Fig. 3 shows an alternative array of electrodes and end wall design for the lancing device of Fig. 1.
- Fig. 4 shows a simplified circuit diagram for the signal generator shown schematically in Fig. 1. DESCRIPTION OF THE SELECTED EMBODIMENT
- the present invention uses electrical treatment of a skin sampling site to achieve one or both of pain masking and blood engorgement before a lancing device causes an incision to be made for blood sampling.
- a lancing de-vice 10 comprising a housing 12 which may be annular in form. Housing 12 has skin contacting end cap 14 which may take the form shown in Fig. 2 or Fig. 3 as discussed below. End cap 14 has an end section 16 removably connected to the end 18 of housing 12. Mounted within housing 12 is a lancet holder 20 com ected to a lancet actuator 22. Lancet actuator 22 is responsive to an operator controlled button 24 through interconnection 26 to cause lancet carrier 22 to displace a lancet 28 to the left as viewed in Fig. 1 to pierce the skin adjacent to device 10.
- lancet actuator 22 is adapted to have a controlled rate of displacement and depth of penetration to provide optimum withdrawal of bodily fluid such as blood.
- Lancet 28 is removable so that it may b e disposed in appropriate fashion after a test is completed.
- Lancet actuator 22 may take one of many diffexent forms to achieve a controlled rate of displacement and penetration depth for the lancet 28. Lancet actuator 22 may be mechanical in form using a spring-like device. It may also be electrically or pneumatically actuated. As herein shown, a capillary passage 35 leads from the mouth of passage 34 adjacent the incision of lancet 28 to a sensor 37 which gives an indication of bodily fluid parameter or condition through optical read-out 39. Alternatively, lancet 28 may to pierce the skin so that a sufficient quantity of blood may accumulate on the skin for application to a test strip (not shown). It should be noted that to hose skilled in the art, the unit may be used to collect blood samples through the lancet 28 and provide still another way to integrate the testing process.
- the lancing device cap 14 has a plurality of electrodes 30 and 32 grouped within sets.
- the electrodes 30 and 32 are positioned in an array around the periphery of an opening 34 for lancet 28.
- the cap 14 may take the form shown in Fig. 2 or in Fig. 3.
- the electrode sets 30 and 32 may be deployed on the head in a variety of arrays to achieve the objectives of the present invention. They may be positioned in a random fashion with pairs positioned adjacent one another without any specific orientation. Alternatively, the pairs may be arranged in circumferential fashion around the opening 34. A further orientation may be in radial arcays. Based on present experimentation, the random orientation of the electrodes allowed achievement of the objectives of the invention. It should be apparent to those skilled in the art that the electrodes may be oriented other than in the random fashion and still achieve objectives of the present invention.
- the electrodes 30 and 32 are connected by lines 36 and 38 to a signal generator and controller 40.
- Signal generator 40 is supplied with electrical power from a power source such as a battery 42 via lines 44 and 46.
- signal generator 40 comprises an integrated circuit (IC) oscillator 70 having input leads 72 and 74.
- Oscillator 70 provides an output on terminal 3 via resistor 76 to the gate of a transistor 78.
- Transistor 78 is connected between line 44 and 46 on the input to a step up transformer 80.
- Output terminal 7 of oscillator 70 provides an input to a variable resistor 82 so as to control the frequency of oscillator 70.
- the output side of transformer 80 is connected to output leads 36 and 38 which lead to the electrodes 30 and 32.
- Capacitors 84 and 86 provide smoothing of the output wave.
- the transistor 78 acts to pass current through the input side of transformer 80 in approximately a square wave.
- the transformer 80 increases the voltage output to an equivalent square wave on the output side.
- Capacitor 86 smoothes the wave form so that it ends up being a high voltage AC waveform.
- Variable resistor 82 is adjustable by means of an operator-manipulated knob 48 via an appropriate connection indicated by dashed line 50.
- Signal generator 40 is of a type that generates a tiigh voltage AC wave.
- the voltage level can be approximately from 10 to 25 kilovolts.
- Tlxe frequency preferably is 20 Hz.
- the signal generator controller 44 can be adapted to control the signal generator 40 through a range of frequencies, voltages and at low current (i.e. 100 miliamps) as appropriate for the applications described below.
- the present invention relies on the principle of electrical treatment prior to the lancing of the skin to accomplish at least one of pain masking and bodily fluid or blood engorgement.
- the electrical pulses stimulate the peripheral terminals of sensory neurons in the body, which cause the release of bioactive substances.
- the e substances for the most part are neuropeptides; substance P and calcitonian gene related peptide. They in turn act on target cells in the periphery of the applied area such as masked cells, immune cells and smooth muscle producing inflammation. This is characterized " by redness and warmth, an indication of vasodialation. This phenomenon is known as neurogenetic inflammation.
- the success rate can further be enhanced by using an expression cap shown in Fig. 2 to permit mechanical compression of the skin site subsequent to lancing.
- the cap 14 has a plurality of electrode pairs 30 and 32 on a skin contacting face 52 in an array around central opening 34 through which the lancet 28 extends when it is actuated.
- skin contacting face 52 is curved in a negative sigmoid shape with an .annular concave section 56 leading from opening 34 to an annular convex section 58.
- the purpose of this configuration is to allow application of the skin contacting face 52 to the sldn site that has been lanced to force bodily fluids such as blood to the incision point in sufficient quantity to obtain a sample for blood analysis.
- the electrical energy is applied for a longer duration prior to making the incision on the skin.
- This electrical power can be used through the same electrode pairs shown in Figures 1 and 2 or it m-ay be as embodied in the device of figure 3 having a flat faced skin contacting cap 60 with a plurality of electrode pairs 62 and 64 positioned to generally surround a central opening 66 for the lancing device.
- the head 60 is connected to a housing 68 containing the elements sho vn in schematic fashion in Fig. 1.
- the electrode pairs 62 _, 64 may be oriented in random, circumferential, or radial fashion.
- the electrodes deliver electrical stimulation to the area to be lanced.
- This electrical stimulation depending upon its nature and character, stimulates the sensory neutrons which manipulate the transmission of signals of afferent information to the spinal cord.
- Electrical stimulation can target the A-delta and C-fibers which deplete neuropeptides content in the terminal ends of the fibers or target the A-beta fiber causing an abundance of signals to be released.
- the type of outcome is dependent upon the typ& and intensity of the electrical stimulus such as pulse rate and duration of applied stimulus. This prevents the neuron's ability to transfer information to the central nervous system with respect to trauma or pain to tissues.
- the stimulus may also target A-beta fibers, which causes an abundance of neuropeptides being released.
- A-beta fibers are associated with the detection of pressure. As the lancing occurs, the signals transmitted by the A-delta and C-fibers are clouded by the abundance of A-beta fiber signals. This phenomenon tends to reduce ttie sensitivity of neociceptive pain. To insure adaptability to as many users as possible because of different individual stimulation thresholds, the device is adjustable for the intensity and pulse rate.
- Table 2 shows the pain rating with and without electrical stimulation. Xhe electrical stimulation was at 20 Hz for at least 60 seconds prior to lancing. A redaction and/or increase in tolerance of pain were achieved with electrical stimulation. It should be apparent to those skilled in the art that the parameters set forth in this description are for illustration purposes only based on current investigation and are not to be construed or interpreted as in any way limiting the range of electrical parameters applied within the scope of present invention.
- the electrical stimulation is applied for approximately 60 seconds and above. After 30 seconds the engorgement of the site with blood is achieved and after approximately 60 seconds the pain masking is realized.
- the lancing device is fired to lance the skin. Subsequent to lancing, the skin contacting surface 52 may be employed to express bodily fluid or blood from the incision for application to a test strip. Alternatively, different forms of lancing devices may be used which extract a sample for delivery to another test device.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05715640A EP1722683A1 (en) | 2004-03-02 | 2005-03-02 | Method and apparatus for electrical stimulation to enhance lancing device performance |
JP2007501200A JP2007526057A (en) | 2004-03-02 | 2005-03-02 | Method and apparatus for electrical stimulation to enhance the performance of an incision device |
CA002557804A CA2557804A1 (en) | 2004-03-02 | 2005-03-02 | Method and apparatus for electrical stimulation to enhance lancing device performance |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/791,173 | 2004-03-02 | ||
US10/791,173 US20050209625A1 (en) | 2004-03-02 | 2004-03-02 | Method and apparatus for electrical stimulation to enhance lancing device performance |
Publications (1)
Publication Number | Publication Date |
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WO2005094682A1 true WO2005094682A1 (en) | 2005-10-13 |
Family
ID=34962579
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2005/002155 WO2005094682A1 (en) | 2004-03-02 | 2005-03-02 | Method and apparatus for electrical stimulation to enhance lancing device performance |
Country Status (6)
Country | Link |
---|---|
US (1) | US20050209625A1 (en) |
EP (1) | EP1722683A1 (en) |
JP (1) | JP2007526057A (en) |
CN (1) | CN1925789A (en) |
CA (1) | CA2557804A1 (en) |
WO (1) | WO2005094682A1 (en) |
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US8321012B2 (en) | 2009-12-22 | 2012-11-27 | The Invention Science Fund I, Llc | Device, method, and system for neural modulation as vaccine adjuvant in a vertebrate subject |
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Also Published As
Publication number | Publication date |
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US20050209625A1 (en) | 2005-09-22 |
CN1925789A (en) | 2007-03-07 |
EP1722683A1 (en) | 2006-11-22 |
CA2557804A1 (en) | 2005-10-13 |
JP2007526057A (en) | 2007-09-13 |
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